JPH05129832A - Antenna system and feeding part - Google Patents

Abstract

PURPOSE:To easily apply the excitation distribution of a radiating port as intended by propagating more complete plane waves between parallel plane conductors, to improve isolation between two orthogonally polarized waves and to execute the transmission/reception of arbitrary polarized waves concerning an antenna system to transmit/receive two orthogonally polarized waves by propagating the radio waves between parallel plane conductors and providing the plural radiating ports of orthogonally polarized waves at one of those parallel plane conductors. CONSTITUTION:The two pairs of feeding parts 5 and 6 having structure to propagate the plane waves between parallel plane conductors 10 and 11 by reflecting partial cylindrical waves excited in the parallel plane conductors 10 and 11 on a reflecting wall 3 on a parabola with a phase center 1 as a focal point are connected to a radiation part 9 equipped with plural radiating ports 7 and 8 making polarized waves orthogonal to one of the two parallel plane conductors 10 and 11, and a polarization control mechanism 14 is provided to propagate the mutually orthogonal plane waves into the radiation part 9 and to adjust the amplitude and phase of the two orthogonal plane waves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feeding type antenna device for propagating radio waves between two parallel plate conductors.

[0002]

2. Description of the Related Art FIGS. 2a and 2b are a front view and a cross-sectional view of an orthogonal dual-polarization dual-purpose antenna, for example, published in Technical Research Report AP-91-2 of the Institute of Electronics, Information and Communication Engineers in 1991. In the figure, 18 is a feeding point position, 19 is a slot for X-axis direction polarization, 20 is a slot for Y-axis direction polarization, 21 is a flat plate conductor in which the slots 19 and 20 are arranged, and 22 is parallel to the bottom of the flat plate conductor 21. Is a flat plate conductor, 23 is a waveguide that feeds the X-axis polarization slot 19, 24 is a waveguide that feeds the Y polarization slot 20, and 25 is a waveguide 23 and a flat conductor. 21 is a feed coupling slot, 26 is a feed coupling slot provided between the waveguide 24 and the plate conductor 21, 27 is a straight line indicating the position of the cross section of FIG. 2b, 28
Is a coordinate axis, and 29 is a traveling direction of a radio wave fed from the waveguide 23.

Next, the operation will be described. Feeding point position 1
A radio wave fed from 8 and traveling in the waveguide 23 excites a feeding coupling slot 25 on the way. Since the power feeding coupling slots 25 are arranged at intervals of the in-tube wavelength of the waveguide 23, they are all excited in the same phase. On the other hand, each plate conductor 21,
Since the distance between the electrodes 22 is sufficiently small, the radio waves excited by the power feeding coupling slot 25 described above are flat conductors 21, 22.
A TEM wave is propagated in the ± direction of the X-axis between them to excite the slot 19 of the X-axis direction polarized wave. As a result, the antenna device of FIG. 2 radiates polarized waves in the X-axis direction. At this time, if the electric wave excited in the power feeding coupling slot 25 propagates only in the ± directions of the X axis, the slot 20 of the Y axis direction polarized wave is not excited.

Power is fed from the feed point position 18 and the waveguide 24
In the same manner as the above-mentioned process, the electric wave traveling in the inside excites the power feeding coupling slot 26, and the electric wave excited in the power feeding coupling slot 26 is a TEM wave between the flat plate conductors 21 and 22 in the ± direction of the Y axis. Propagates in the Y axis direction and excites the slot 20 of polarization in the Y-axis direction. As a result, the antenna device of FIG. 2 can also radiate the Y-axis direction polarized wave. The position 18 of the feed point of the waveguide 23 and the position of the feed point of the waveguide 24 are the same in FIG. 2, but the feed points of the two are different.

[0005]

The conventional dual antenna for dual polarized waves is configured as described above. However, in this type of antenna device, a plurality of feeding coupling slots 25,
Since power is supplied via 26, it is difficult to propagate a complete plane wave between the flat plate conductors 21 and 22, and therefore it is difficult to provide an arbitrary distribution in the slots 19 and 20 and to isolate the orthogonal polarizations. However, the polarization of transmission and reception was limited to two.

The present invention has been made in order to solve the above problems, and the excitation distribution of the radiation port can be easily attached as intended, the isolation between the two orthogonal polarizations can be improved, and can be arbitrarily set. The purpose is to obtain an antenna device that can transmit and receive polarized waves of, and an antenna device that has a smaller frequency characteristic in the beam direction, an antenna device that has a smaller physical area, a feeding part that reduces the number of bent parts, and there is no blocking at the same time. The purpose is to obtain a power supply unit that can supply power to a plurality of radiation units.

[0007]

SUMMARY OF THE INVENTION An antenna device according to the present invention has a radiation portion in which one of two parallel plate conductors is provided with a plurality of radiation ports whose polarizations are orthogonal to each other, and a portion excited in the parallel plate conductor. Two sets of feeding parts for propagating a plane wave between parallel plate conductors by reflecting a cylindrical wave by a reflection wall on a parabola whose center is the phase center are provided, and two plane waves orthogonal to each other are propagated to the radiation part. In addition, a polarization control mechanism for adjusting the amplitude and phase of the two orthogonal plane waves is provided.

Further, in order to eliminate the frequency characteristic in the beam direction, the feeding parts are installed so as to face each other with the radiating part in between, and two plane waves having the same polarization and the same frequency but opposite traveling directions are arranged in the radiating part. Propagate.

In order to further reduce the physical area of the antenna device, the feeding portion is folded at the boundary between the radiation portion and the feeding portion to the ground conductor side of the radiation portion, and the feeding portion protrudes from the radiation portion. Fold the side opposite to the radiation part.

In order to reduce the number of times of bending and to supply electric power, an exciting wave source of a cylindrical wave between two parallel plate conductors and a radius (0.5n + 0.25) about the phase center of the exciting wave source are used. ) A semi-cylindrical reflection wall of λ (n: positive integer, λ: wavelength in the feeding part) is provided, and the phase center of the excitation wave source is focused on the opposite side of the semi-cylindrical reflection wall across the excitation wave source. A power feeding unit is configured by installing a reflecting wall on a parabola.

Further, in order to prevent blocking in the power feeding section and to feed power to a plurality of radiation sections, an exciting wave source of a cylindrical wave is provided in the lower parallel plate waveguide of the upper, middle and lower three parallel plate waveguides, and The middle-lower two-layer parallel plate waveguides are connected on two parabolas facing each other with the phase center of the excitation wave source as a focal point, and the upper-middle two-layer parallel plate waveguides intersect with each other. A partition is provided on the straight line connecting the points to connect them, and a reflecting wall that is inclined so as to allow the plane wave to proceed to the next layer without being reflected is formed in all the above-mentioned connecting portions to form a power feeding unit.

[0012]

In the antenna device configured as described above, the partial cylindrical wave excited in the parallel plate conductor is reflected by the reflecting wall on the parabola whose focal point is the center of the phase to generate the plane wave between the parallel plate conductors. By using two sets of power feeding parts to propagate,
Between parallel plate conductors with a plurality of radiation ports with orthogonal polarizations provided on one surface, a more complete plane wave that is orthogonal is propagated, so the excitation distribution of the radiation ports can be easily attached as intended,
The isolation between two orthogonal polarizations is also improved, and the amplitude and phase of two orthogonal plane waves are adjusted, so that arbitrary polarizations can be transmitted and received.

Further, by disposing the feeding parts so as to face each other with the radiating part in between, two plane waves having traveling directions opposite to each other are propagated to the radiating part to excite a standing wave in the feeding part. This cancels the excitation phase shift of each radiation port when the frequency changes, and the frequency characteristic in the beam direction can be eliminated.

Further, at the boundary between the radiation part and the power feeding part, the power feeding part is
The physical area of the antenna device can be reduced by folding the radiation portion on the ground conductor side and folding the portion of the feeding portion protruding from the radiation portion on the side opposite to the radiation portion.

Further, an exciting wave source of a cylindrical wave is provided between two parallel plate conductors, and a semi-cylindrical reflecting wall having a radius (0.5n + 0.25) λ centering on the phase center of the exciting wave source (n: positive number,
λ: wavelength in the feeding section), and further, by installing a reflecting wall on a parabola whose focal point is the phase center of the exciting wave source, on the opposite side of the half cylindrical reflecting wall with the exciting wave source interposed therebetween, With this configuration, since the folding part only needs to be the boundary between the radiation part and the power feeding part, it is possible to feed the radiation part with a smaller number of bendings.

Further, an exciting wave source of a cylindrical wave is provided in the lower parallel plate waveguide of the upper and lower middle parallel plate waveguides, and the middle and lower two layers of the parallel flat plate waveguide are focused on the phase center of the exciting wave source. Two parallel parabolic lines facing each other are connected, and the parallel-plate waveguides of the upper and middle two layers are connected by providing a partition on a straight line connecting the points where the above two parabolas intersect, and all the above connecting parts are connected. With the feed part configured by providing a tilted reflection wall so that the plane wave can travel to the next layer without being reflected, the cylindrical wave emitted from the excitation wave source becomes a plane wave when traveling from the lower layer to the middle layer, and is directed to the upper layer. 2 propagates as two opposite plane waves, and there are no obstacles on the way, so that it is possible to feed power to a plurality of radiators without blocking in the feeder.

[0017]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is the phase center of a cylindrical wave, 2 is a primary radiator such as an H-plane horn that radiates a cylindrical wave,
3 is a reflection wall on a parabola whose center is the phase center 1 of the cylindrical wave, 4 is a coordinate system, 5 is a feeding portion that radiates a plane wave in the X-axis direction of the coordinate system 4, 6 is the Y-axis direction of the coordinate system 4. Is a feeder for radiating a plane wave, 7 is a slot elongated in the Y-axis direction arranged at intervals of one wavelength (wavelength in the radiation section 9) in the X-axis direction of the coordinate system 4, and 8 is the Y-axis direction of the coordinate system 4. 1 wavelength (radiation part 9
Slots elongated in the X-axis direction, which are arranged at intervals of (inner tube wavelength), 9 is a radiating portion, 10 is a radiating side flat plate conductor, 11 is a non-radiating side flat plate conductor, and 12 is provided along the end of the radiating part 9. The electromagnetic wave absorber, 13 is the traveling direction of the plane wave radiated from the power feeding section 5, 14 is the polarization control mechanism for adjusting the feeding amplitude and phase to the power feeding section 5 and the power feeding section 6, and 15 is the radiation from the power feeding section 6. The plane wave traveling direction, 16 is the feeding portion 5 and the radiating portion 9.
Is a boundary between the power feeding section 6 and the radiating section 9.

Next, the operation will be described. When the power feeding unit 5 is fed, a radio wave is emitted as a cylindrical wave from the primary radiator 2 of the power feeding unit 5, is reflected by the reflection wall 3 on the parabola whose focal point is the phase center 1, and travels to the radiation unit 9. At this time, the path lengths from the phase center 1 match at any point on the boundary 16, so that a plane wave is formed in the future. The plane wave travels in the radiation section 9 in the X-axis direction while exciting and attenuating only the elongated slot 7 in the Y-axis direction, and is finally absorbed by the radio wave absorber 12. Since the slot 7 radiates polarized waves in the X-axis direction and is aligned for each wavelength, the excitation phases match and radiate linearly polarized waves in the X-axis direction in the front (Z-axis) direction.

Next, when the power feeding section 6 is fed, the plane wave travels in the radiation section 9 in the Y-axis direction according to the same principle as when feeding the power feeding section 5. This plane wave excites only the elongated slot 8 in the X-axis direction, and as a result, in the front (Z-axis) direction,
A linearly polarized wave in the Y-axis direction is emitted.

As described above, the radiation section 9 radiates two linearly polarized waves whose polarization planes are orthogonal to each other. If the amplitude and phase of these two linearly polarized waves are adjusted by the polarization control mechanism 14, transmission and reception with arbitrary polarized waves can be performed.

For example, if the phases of two orthogonal linearly polarized waves are the same or opposite to each other and the amplitudes of the two polarized waves are adjusted, linearly polarized waves having arbitrary polarization planes can be transmitted and received.

Circularly polarized waves can be transmitted / received by setting the amplitudes of two orthogonal linearly polarized waves to be the same and giving a phase difference of ± 90 ° to each other.

Further, by adjusting both the amplitude and phase of two orthogonal linearly polarized waves, an arbitrary elliptically polarized wave can be transmitted and received.

By using the polarization control mechanism 14 as described above, a plurality of polarizations can be transmitted / received by one antenna device of the present invention.

Example 2. FIG. 3 is a front view of the antenna device according to the first embodiment with the electromagnetic wave absorber removed and two power feeding units added instead. In FIG. 3, reference numeral 30 denotes a power feeding portion that radiates a plane wave whose traveling direction is opposite to that of the power feeding portion 5, and reference numeral 31 denotes a power feeding portion that radiates a plane wave whose traveling direction is opposite to that of the power feeding portion 6. 4 is a cross-sectional view of FIG. 3, where a is slot 7
In the case where the interval is 1 wavelength, b is the case where the frequency is higher than a and the interval between the slots 7 is 1 wavelength or less. In FIG. 4, 32 is an arrow indicating the traveling direction of the plane wave radiated from the power feeding unit 30, 33 is an electric field vector of each slot 7 excited by the plane wave traveling from the power feeding unit 5,
34 is an electric field vector of each slot 7 excited by a plane wave traveling from the power feeding unit 30. 35 is the electric field vector 3
The sum vector of 3 and 34, that is, the total excitation electric field vector of each slot 7, 36 is the current distribution due to the plane wave traveling from the feeding portion 5 at a certain moment, and 37 is the plane wave traveling from the feeding portion 30 at the same moment as the current distribution 36. It is a current distribution.

Next, the operation will be described. As can be seen from FIG. 4a, when the spacing between the slots 7 is one wavelength, each slot 7 is excited in phase by a plane wave coming from either of the feeding parts 5 and 30. Therefore, two power feeding units are not always required.

On the other hand, when the frequency becomes slightly higher and the spacing between the slots 7 becomes one wavelength or more, the excitation phase of each slot 7 is gradually delayed in the traveling direction of the plane wave, as is apparent from FIG. 4b. If the power supply is the power supply unit 5 or 3
If it is performed only on one side of 0, the beam direction will shift from the front due to this excitation phase difference. However, if power is supplied from both sides, the excitation phase difference is canceled because the feeding directions are opposite, and the distribution of the excitation amplitude phase becomes symmetrical, so the beam direction does not move from the front. The same applies to the power feeding by the power feeding units 6 and 31. As described above, by propagating the plane waves whose traveling directions are opposite to each other to the radiating section 9, it is possible to prevent the beam direction change due to the frequency change.

Example 3. FIG. 5 is a plan view of the antenna device of the second embodiment, in which the parallel plate conductors are connected to the feeding portions 5, 6, 30, 31.
And FIG. 6 is a sectional view taken along the straight line 38 in FIG.

Next, the operation will be described. As described above, in the present embodiment, the parallel plate conductor is folded at the boundary between the feeding portions 5, 6, 30, 31 and the radiation portion 9. At the portion corresponding to the fold, a reflection wall is provided as shown by the hatched portion in FIG. 6 so that the radio wave travels to the radiating section 9 without causing unnecessary reflection. Since the path length of the radio wave does not change, the subsequent operation is the same as in the second embodiment.

In general, in order to obtain a higher gain in the antenna device of the second embodiment, the radiating portion 9 may be made larger, but the feeding portions 5, 6, 30, 31 are also made larger accordingly, and the necessary gain should be satisfied as much as possible. It is disadvantageous if a small antenna arrangement is required. Furthermore, although the frequency characteristic in the beam direction can be prevented in the antenna device of the second embodiment,
FIG. 4b The sum of all excitation electric field vectors is smaller in magnitude than that of FIG. This decrease in gain becomes more remarkable as the radiation portion 9 is larger. In order to increase the gain while suppressing the decrease in the gain, a large number of antenna devices may be combined to form an array, but in the antenna device of the second embodiment, the presence of the feeding portion causes the array aperture to be larger than necessary.

The antenna device of the present embodiment has an advantage that the physical area is smaller than that of the second embodiment even with the same gain. Further, since the physical area is only the radiating portion 9, the array aperture can be made to have the minimum size even if it is made into an array, and no waste occurs.

Example 4. 7A and 7B are a cross-sectional view of the XY plane and a ZX plane when the feeding portion of the antenna device of the third embodiment is a feeding portion with less bending.
Reference numeral 39 is an excitation wave source of a cylindrical wave, 40 is a semi-cylindrical reflection wall of radius (0.5n + 0.25) × wavelength centered on the excitation wave source 39, 41 is the semi-cylindrical reflection wall 40 sandwiching the excitation wave source 39.
A parabolic reflection wall focusing on the excitation wave source 39 installed on the opposite side of the, a slanted reflection wall 42 at the fold of the radiation part 9 and the feeding part, 43 a straight line showing the cross section of FIG. 7b, and 44 an excitation This is a mark indicating the traveling direction of the radio wave excited by the wave source 39.

Next, the operation will be described. Excitation wave source 39
Of the cylindrical wave excited by the half-cylindrical reflection wall 40, returns to the excitation wave source 39, and advances to the parabolic reflection wall 41 installed on the opposite side, but the radius of the anti-cylindrical reflection wall 40 Is (0.5n + 0.25) × wavelength, and therefore has the same phase as the radio wave that has traveled from the beginning to the parabolic reflection wall 41. Therefore, most of the cylindrical wave excited by the excitation wave source 39 is reflected by the reflection wall 41 on the parabola, then reflected by the inclined reflection wall at the fold of the radiation portion 9 and the feeding portion, and advances to the radiation portion. As in the first embodiment, the phase planes are aligned in the Y-axis direction when traveling to the radiating portion.

The power feeding unit of this embodiment has an advantage that the number of times of bending is smaller than that of the power feeding unit of the third embodiment.

Although only one power feeding portion is shown in FIG. 7, it goes without saying that this can be arranged at the four corners of the radiation portion 9. Further, when the power feeding portions at the four corners are bent and overlapped, they may be stacked in multiple layers as in the third embodiment.

Example 5. 8, 9 and 10 show the third embodiment.
The cross-sectional view of the ZX plane in the case where the feeding part of the antenna device is combined with the inclined reflecting walls on the parabola with the excitation wave source as the focal point in two upper and lower stages to prevent blocking in the feeding part, and FIG. 8 is a cross-sectional view taken along the XY plane of the straight lines 47 and 48 of FIG. It should be noted that a plurality of radiating parts are fed. In FIG. 8, reference numeral 45 denotes an inclined reflecting wall on a parabola with the excitation wave source 39 as a focal point, and is combined in two stages as shown in the figure. 46 is an inclined reflecting wall at the fold of the radiation part and the power feeding part, 47 and 48 are straight lines representing the cross sections of the cross-sectional views 9 and 10, 49 is a mark indicating the traveling direction of the radio wave excited by the excitation wave source 39, 50 is a boundary between adjacent radiating parts.

Next, the operation will be described. Excitation wave source 39
The cylindrical wave excited by is reflected by the reflection wall 45 on the parabola whose focal point is the excitation wave source 39 as shown in FIG.
Proceed to layer 0. By the time the radio waves travel through FIG. 10, the phases are already aligned in the Y-axis direction. The radio wave is further reflected by the inclined reflecting wall 46 at the fold line between the radiating portion and the power feeding portion and travels to the radiating portion. The subsequent operation is the same as that of the second embodiment.

In this embodiment, since there is no blocking by the semi-cylindrical reflecting wall 40 of the fourth embodiment, the excitation wave source 3 can be more efficiently used.
Power can be supplied to the radiator from 9. Further, since the two radiating parts are fed at one feeding point, it is very advantageous for an array antenna.

As in the case of the fourth embodiment, it is possible to dispose the main power feeding portions at the four corners of the radiating portion, and when the power feeding portions at the four corners overlap, they can be stacked in multiple layers as in the third embodiment.

In the above description, the antenna device capable of transmitting and receiving a plurality of polarized waves is described. However, when it is necessary to change the plane of polarization, the present invention uses the polarization control mechanism 14 without physically moving the antenna. It has the advantage that the plane of polarization can be changed only by adjustment.

For example, in TDMA (time division multiple access) communication, when the polarization changes in time division, TDM
The polarization control mechanism 14 adjusts the polarization in synchronization with the signal sent by A.

Further, even when the polarization changes depending on the propagation state due to the influence of the ionosphere, the polarization control mechanism 14 adjusts the polarization to maintain a good communication state.

In addition, the present invention has a much simpler feeding system than the antenna device having a similar function formed by using a microstrip antenna, a triplate line, or a microstrip line, and is easy to manufacture with a loss. Has the advantage that

[0044]

Since the present invention is configured as described above, it has the following effects.

Using two sets of feeding parts for propagating a plane wave between parallel plate conductors by reflecting a partial cylindrical wave excited in the parallel plate conductor by a reflection wall on a parabola whose focal point is the phase center, Since a more complete orthogonal plane wave is propagated between parallel plate conductors with a plurality of radiation openings orthogonal to each other on one surface, it is easy to attach the excitation distribution of the radiation openings as intended, and between the two orthogonal polarizations. Since the isolation is improved and a polarization control mechanism for adjusting the amplitude and phase of two orthogonal plane waves is provided, arbitrary polarization can be transmitted and received.

Further, by disposing the feeding parts so as to face each other with the radiating part sandwiched therebetween, two plane waves whose traveling directions are opposite to each other are propagated to the radiating part to excite the standing wave in the radiating part and It is possible to prevent the beam direction from fluctuating when the value changes.

Further, by folding the power feeding portion on the ground conductor side of the radiation portion at the boundary between the radiation portion and the radiation portion, and folding the portion of the feeding portion protruding from the radiation portion on the side opposite to the radiation portion, the antenna device physical Area can be reduced.

Further, the semi-cylindrical reflection wall and the reflection wall on the parabola are used as the excitation wave source of the cylindrical wave to form the power feeding portion, so that the number of bendings can be reduced and power can be fed to the radiation portion.

Further, by using a power feeding section in which inclined reflecting walls provided on a parabola whose focal point is the center of the phase of the cylindrical wave excitation wave source is combined in upper and lower stages, blocking in the power feeding section is prevented and a plurality of radiation sections are provided. Can be powered.

[Brief description of drawings]

FIG. 1 is a front view showing an antenna device according to a first embodiment of the present invention.

FIG. 2 is a front view of a conventional antenna device.

FIG. 3 is a front view showing an antenna device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a cross section of an antenna device according to a second embodiment of the present invention and a state of an excitation electric field vector.

FIG. 5 is a front view showing an antenna device according to a third embodiment of the present invention.

FIG. 6 is a sectional view showing an antenna device according to a third embodiment of the present invention.

FIG. 7 is a sectional view showing an antenna device according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view showing an antenna device according to a fifth embodiment of the present invention.

FIG. 9 is a sectional view showing an antenna device according to a fifth embodiment of the present invention.

FIG. 10 is a sectional view showing an antenna device according to a fifth embodiment of the present invention.

[Explanation of symbols]

1 Phase Center of Cylindrical Wave 2 Primary Radiator 3 Reflection Wall 4 Coordinate System 5 Feeding Part 6 Feeding Part 7 Elongated Slot in Y-axis 8 Elongated Slot in X-axis 9 Radiating Part 10 Plate Conductor on Radiation Side 11 Non-Radiation Side Flat conductor of 12 Electromagnetic wave absorber 13 Direction of travel of plane wave fed from power supply section 5 14 Polarization control mechanism for adjusting amplitude and phase of plane wave fed from power supply sections 5 and 6 15 Direction of travel of plane wave fed from power supply section 6 16 Boundary between the feeding part 5 and the radiating part 17 Boundary between the feeding part 5 and the radiating part 18 Feeding position 19 Slot for X-axis direction polarization 20 Slot for Y-axis direction polarization 21 Plate conductor 22 Parallel to the bottom of the plate conductor 21 A flat plate conductor placed on the wire 23 A waveguide for feeding the slot 19 for X-axis polarization 24 A waveguide for feeding the slot 20 for Y-axis polarization 25 Feeding coupling slot 26 For feeding Combined slot 27 Straight line showing the position of the cross section of FIG. 2b 28 Coordinate axis 29 Direction of travel of radio wave fed from the waveguide 23 30 Feed part 31 Feed part 32 Arrow indicating the direction of travel of plane wave 33 Slot excited by the feed part 5 7 Electric field vector 34 Electric field vector of slot 7 excited by power supply 30 35 Total excitation electric field vector 36 of slot 7 Current distribution by power supply 5 at a certain moment 37 Current distribution by power supply 30 at the same moment as current distribution 36 38 Straight line 39 showing cross section of FIG. 6 Excitation source of cylindrical wave 40 Semi-cylindrical reflection wall 41 Reflection wall on parabola 42 Inclined reflection wall at fold of radiating part 9 and feeding part 43 Straight line showing cross section of FIG. 7b 44 Excitation wave source Mark indicating the traveling direction of the radio wave excited by 39 45 Inclined reflecting wall on the parabola 46 Radiating part and feeding part Is at the boundary of the radiation unit indicia 50 adjacent indicating the traveling direction of the electromagnetic wave excited by the linear 49 excitation wave source 39 showing a cross-section of the linear 48 Figure 8c illustrating the inclined section of the reflecting wall 47 Figure 8b in the fold

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[Procedure amendment]

[Submission date] February 20, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art FIGS. 2a and 2b are a front view and a cross-sectional view of an orthogonal dual-polarization dual-purpose antenna, for example, published in Technical Research Report AP-91-2 of the Institute of Electronics, Information and Communication Engineers in 1991. In the figure, 18 is a feeding point position, 19 is a slot for X-axis direction polarization, 20 is a slot for Y-axis direction polarization, 21 is a flat plate conductor in which the slots 19 and 20 are arranged, and 22 is parallel to the bottom of the flat plate conductor 21. Is a flat plate conductor, 23 is a waveguide that feeds the X-axis polarization slot 19, 24 is a waveguide that feeds the Y polarization slot 20, and 25 is a waveguide 23 and a flat conductor. 22 is a feed coupling slot provided between the waveguides, 26 is a feed coupling slot provided between the waveguide 24 and the plate conductor 22 , 27 is a straight line indicating the position of the cross section of FIG.
Is a coordinate axis, and 29 is a traveling direction of a radio wave fed from the waveguide 23.

[Procedure Amendment 2]

[Document name to be amended] Statement

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[Correction method] Change

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Further, by disposing the feeding parts so as to face each other with the radiating part in between, two plane waves having traveling directions opposite to each other are propagated to the radiating part to excite a standing wave in the feeding part. As a result, the excitation phase shift of each radiation port when the frequency changes can be canceled out , and the frequency characteristic in the beam direction can be eliminated.

[Procedure 3]

[Document name to be amended] Statement

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[Correction method] Change

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Example 2. FIG. 3 is a front view of the antenna device according to the first embodiment with the electromagnetic wave absorber removed and two power feeding units added instead. In FIG. 3, reference numeral 30 denotes a power feeding portion that radiates a plane wave whose traveling direction is opposite to that of the power feeding portion 5, and reference numeral 31 denotes a power feeding portion that radiates a plane wave whose traveling direction is opposite to that of the power feeding portion 6. 4 is a cross-sectional view of FIG. 3, where a is slot 7
In the case where the interval is 1 wavelength, b is the case where the frequency is lower than a and the interval between the slots 7 is 1 wavelength or less. In FIG. 4, 32 is an arrow indicating the traveling direction of the plane wave radiated from the power feeding unit 30, 33 is an electric field vector of each slot 7 excited by the plane wave traveling from the power feeding unit 5,
34 is the electric field vector of each slot 7 excited by the plane wave traveling from the power feeding unit 30 , 35 is the electric field vector 3
The sum vector of 3 and 34, that is, the total excitation electric field vector of each slot 7, 36 is the current distribution due to the plane wave traveling from the feeding portion 5 at a certain moment, and 37 is the plane wave traveling from the feeding portion 30 at the same moment as the current distribution 36. It is a current distribution.

[Procedure amendment 4]

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[Correction method] Change

[Correction content]

On the other hand, when the frequency becomes slightly lower and the spacing between the slots 7 becomes one wavelength or less , the excitation phase of each slot 7 gradually advances in the traveling direction of the plane wave, as is apparent from FIG. 4b. If the power supply is 5 or 30
If it is performed only on one side, this excitation phase difference causes the beam direction to shift from the front. However, if power is supplied from both, the excitation phase difference is canceled out because the power supply directions are opposite,
Moreover, the beam direction does not move from the front because the distribution of the excitation amplitude phase is symmetric. The same applies to the power feeding by the power feeding units 6 and 31. As described above, by propagating the plane waves whose traveling directions are opposite to each other to the radiating section 9, it is possible to prevent the beam direction change due to the frequency change.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

Next, the operation will be described. Excitation wave source 39
In also is given of the excited cylindrical wave reflected by the semi-cylindrical reflection wall 40, back towards the excitation wave source 39, the process proceeds to the reflecting wall 41 on parabola disposed on the opposite side, counter-cylindrical reflection wall 40 for radius is (0.5n + 0.25) × wavelength, excitation
Directly from the wave source 39, the radio wave proceeds to the reflecting wall 41 of the parabolic line and phase match. Thereafter Since most cylindrical wave excited by the excitation wave source 39 reflected by the reflecting wall 41 on the parabola, proceeds to radiation portion is reflected in a certain inclined reflecting wall to fold the feeding portion and the radiating portion 9. Y when proceeding to the radiating section
The fact that the phase planes are aligned in the axial direction is the same as in the first embodiment.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of Codes] 1 Phase center of cylindrical wave 2 Primary radiator 3 Reflection wall 4 Coordinate system 5 Feed section 6 Feed section 7 Slot elongated in the Y-axis direction 8 Slot elongated in the X-axis 9 Radiating section 10 Flat plate conductor on the radiating side 11 Plane conductor on the side not on the radiation side 12 Radio wave absorber 13 Direction of travel of the plane wave fed from the feeding section 5 14 Polarization control mechanism for adjusting the amplitude and phase of the plane wave fed from the feeding sections 5 and 6 15 Feeding from the feeding section 6 Direction of traveling plane wave 16 Boundary between feeding part 5 and radiating part 17 Boundary between feeding part 6 and radiating part 18 Feeding position 19 Slot for X-axis polarized wave 20 Slot for Y-axis polarized wave 21 Plate conductor 22 Plate conductor 21 a flat plate conductor placed in parallel underneath 23 a waveguide for feeding slot 19 of X-axis polarized wave 24 a waveguide for feeding slot 20 of Y-axis polarized wave 25 a coupling slot for feeding 2 26 Coupling slot for feeding 27 Straight line showing the position of the cross section of FIG. 2b 28 Coordinate axis 29 Direction of travel of the radio wave fed from the waveguide 30 30 Feed part 31 Feed part 32 Arrow indicating the direction of plane wave 33 By the feed part 5 Electric field vector 34 of slot 7 to be excited 34 Electric field vector of slot 7 to be excited by power supply 30 35 Total electric field vector 36 to be excited of slot 7 Current distribution by power supply 5 at a certain moment 37 Power supply 30 at the same moment as current distribution 36 Current distribution by 38 38 Straight line showing cross section of FIG. 39 Excitation source of cylindrical wave 40 Semi-cylindrical reflection wall 41 Reflection wall on parabola 42 Inclined reflection wall at fold of radiation part 9 and feeding part 43 Shows cross section of FIG. 7b Straight line 44 Mark indicating the traveling direction of the radio wave excited by the excitation wave source 39 45 Inclined reflection wall on the parabola 46 Radiating portion adjacent indicia 50 indicating the traveling direction of the electromagnetic wave excited by the linear 49 excitation wave source 39 showing a cross-section of the linear 48 Figure 10 shows the inclined section of the reflecting wall 47 Figure 9 in the folds of the feeding portion and the radiating portion It is a boundary

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayoshi Furuno 325 Kamimachiya, Kamakura City Mitsubishi Electric Co., Ltd. Kamakura Factory (72) Inventor Shin Kei Kamikura 325 Kamimachiya, Mitsubishi Electric Corporation Kamakura Factory

Claims (5)

[Claims] 1. A radiation part in which a plurality of radiation ports of orthogonal polarization are provided on one of two parallel plate conductors, and a partial cylindrical wave excited in the parallel plate conductor is focused on the phase center of the partial cylindrical wave. In an antenna device provided with a feeding portion for propagating a plane wave between the parallel plate conductors by reflecting the reflection wave on the parabola, two plane waves orthogonal to the radiation portion by using two sets of the feeding portions. And a polarization control mechanism for adjusting the amplitude and phase of the two plane waves that are orthogonal to each other. 2. An antenna device comprising: a radiating part having a radiating port formed in one of two parallel plate conductors; and a plurality of feeding parts connected to the radiating part for propagating electromagnetic waves in the radiating part. Two sets of power feeding units are installed so as to face each other with the radiating unit interposed therebetween, and two plane waves having opposite traveling directions, the same polarization and the same frequency are propagated, and a standing wave is generated in the radiating unit. An antenna device characterized in that it is constructed in a tatsutsu. 3. A parabola reflecting a partial cylindrical wave excited in the parallel flat plate conductor with a radiation center provided on one of the two parallel flat plate conductors and focusing on the phase center of the partial cylindrical wave. In an antenna device in which a feeding part for propagating a plane wave between the parallel plate conductors by being reflected by a wall is connected to the radiating part, the feeding part is arranged at the boundary between the radiating part and the feeding part. An antenna device, characterized in that it is folded into the ground conductor side, and a portion of the power feeding portion protruding from the radiation portion is folded into a side opposite to the radiation portion. 4. An exciting wave source of a cylindrical wave between two parallel plate conductors, and a semi-cylindrical reflecting wall (n: a positive integer, with a radius (0.5n + 0.25) λ centered on the phase center of the exciting wave source. λ: wavelength in the feeding part), and a parabolic reflection wall whose focal point is the phase center of the excitation wave source is provided on the opposite side of the half-cylindrical reflection wall with the excitation wave source interposed therebetween. A power feeding unit characterized by propagating a plane wave between them. 5. An excitation wave source of a cylindrical wave is provided in a lower layer parallel plate waveguide of the upper and lower middle three layers of the parallel plate waveguide, and the middle and lower two layers of the parallel plate waveguide have a phase center of the excitation wave source. Are connected on two parabola opposed to each other with a focal point as a focal point, and the parallel-plate waveguides of the upper middle two layers are connected by providing a partition on a straight line connecting the points where the two parabola intersect, and all of the above. A feed portion characterized by propagating two plane waves in different directions in the upper layer parallel plate waveguide by providing a reflection wall inclined so that the plane wave does not reflect and can travel to the next layer in the connecting portion. ..