CN102299425B - High-power low-PIM (passive intermodulation) broadband polarized frequency duplexing feed assembly in Ku frequency band - Google Patents
High-power low-PIM (passive intermodulation) broadband polarized frequency duplexing feed assembly in Ku frequency band Download PDFInfo
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Abstract
The invention discloses a high-power low-PIM (passive intermodulation) broadband polarized frequency duplexing feed assembly in a Ku frequency band, comprising a symmetrical two-arm orthogonal modal coupler and two frequency duplexers, wherein the symmetrical two-arm orthogonal modal coupler comprises an inner structure and a shell; the inner structure comprises a public square waveguide, a symmetrical two-arm coupling access and a longitudinal straight access, thus forming a public port, a symmetrical two-arm synthetic port and a longitudinal straight port; two side faces of the public square waveguide are provided with two rectangle coupling windows with the same size symmetrically; an inductive column which is parallel to and has the same length with a long edge of the rectangle coupling window is inserted into the middle point of a short edge of each rectangle coupling window; and a shaping diaphragm which is vertically connected with the rectangle coupling windows at two sides is inserted into the center in the public square waveguide. According to the assembly, the symmetrical two-arm orthogonal modal coupler is connected to the two frequency duplexers to finish the polar duplex and the frequency duplex of signals, thus solving the two traditional technical problems of the polar duplex and the frequency duplex of an antenna system at the Ku frequency band. The special shaping curve diaphragms and the inductive columns are utilized in the symmetrical two-arm orthogonal modal coupler, thus realizing the broadband matching and avoiding the asymmetrical higher order modes. The assembly has the advantage of compact structure.
Description
Technical field
The present invention relates to a kind of two-wire polarization duplexer feed, particularly relate to a kind of Ku frequency range high-power (the synthetic power of public port reaches 1840W) low PIM (port that requirement is connected with transponder input at feed assembly, 7 rank be less than-193dBc of PIM product under high low temperature condition) broadband polarization frequency-duplex feed assembly, belongs to Novel satellite borne antenna feed systems technology field.
Background technology
Satellite Payloads antenna subsystem can make to realize reception and the emission function of electromagnetic signal, traditional antenna subsystem design adopts antenna receiving-sending to separate scheme, i.e. a secondary reception antenna and a secondary transmitting antenna, the technical difficulty of this scheme is less, feed component technology is easy to realize, without considering broadband matching problem, within the scope of frequency of utilization, can obtain higher performance.But its drawback also clearly, the volume of two slave antennas and quality can make topology layout design pay very high cost, increase the bearing pressure of satellite platform.
Single antenna, double-fed source side case are the improved forms that antenna receiving-sending separates scheme, this scheme adopts a set of reflector and two cover feeds (receiving feed, transmitting feed), feed assembly is still considered arrowband instructions for use, technology is simpler, and by the pressure transfer of topology layout to emitter, but this can increase reflector figuration difficulty, and if two feeds are not at optimal location, can sacrifice antenna overall performance.
The development of a new generation's communication satellite has proposed to be more strict with to payload system, such as making full use of limited frequency resource, system channel quantity and channel power capacity, constantly increase, anti-PIM ability constantly promotes etc., particularly in Ku frequency range, conventionally require single width antenna receiving-sending to share, this has increased passive intermodulation (PIM) risk of system undoubtedly, the linear degree that needs strict control system, and in order to boost the efficiency of frequency resources utilization, two-wire polarization mode is also more utilized.
Design difficulty in two-wire polarization duplexer feed assembly is orthomode coupler assembly, reception and transmit frequency band are all contained in the transmission of each polarized signal, therefore the Broadband Matching of signal, higher mode inhibition and interport isolation are all the problems that needs emphasis to consider, the symmetrical four arm coupling orthomode couplers of existing general employing, although symmetrical four arm coupling orthomode couplers can be realized preferably performance in very wide frequency band range, but its complex structure, is not suitable for the requirement of topology layout compactness.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, a kind of compact broadband polarization frequency-duplex feed assembly that has solved multiplexing and these two the conventional art difficult problems of polarization multiplexing of Ku band antenna system frequency is provided, has further met the strict demand of the desired high power tolerance of payload system and low PIM simultaneously.
Technical solution of the present invention is: the high-power DiPIM of a kind of Ku frequency range broadband polarization frequency-duplex feed assembly, by symmetrical both arms orthomode coupler and two frequency diplexers, formed, described symmetrical both arms orthomode coupler comprises internal structure and shell, described internal structure comprises public square wave guide, symmetrical both arms coupling path and longitudinally straight-through road, form public port, the synthetic port of symmetrical both arms and longitudinally straight-through port, the Liang Ge side symmetry of described public square wave guide is opened up two unidimensional rectangle coupling windows, the long limit of rectangle coupling window center line overlaps with public square wave guide side center line, two rectangle coupling windows are of two symmetrical both arms of connected symmetrical dendrimer both arms coupling paths respectively, the angle of rectangle coupling window and symmetrical both arms is 45 °, in the minor face midpoint of rectangle coupling window, insert the perceptual post parallel and isometric with the long limit of rectangle coupling window, placed in the middle insertion and both sides rectangle coupling window figuration diaphragm connected vertically in public square wave guide, the thickness direction of figuration diaphragm is parallel with the long limit of rectangle coupling window, the linear intercepting on described figuration diaphragm top is from one section of exponential function curve, the linear symmetry in both sides is consistent, bottom is rectangle, the width of rectangle is consistent with the length of side of public square wave guide, the intersection point of top exponential function curve and bottom rectangle drops on the long limit away from public port of both sides rectangle coupling window, public square wave guide connection side square changeover portion and 90 ° of waveguide bends of E face form longitudinal straight-through port, the breeches joint that symmetrical both arms coupling path connects insertion triangle diaphragm forms the synthetic port of symmetrical both arms, longitudinally straight-through port is respectively connected a frequency diplexer with the synthetic port of symmetrical both arms.
Described frequency diplexer is that transmission channel filter and receive path filter form by T connector and two path filters, transmission channel filter and receive path filter adopt H face patching, the symmetrical horizontal ends both sides of T connector connect transmission channel filter and receive path filter by one section of straight wave guide respectively, the vertical end of T connector forms public port, at the public port place of T connector, have a pair of symmetrical H facial mask sheet, the side at the horizontal ends center of T connector near receive path filter has a tuning tooth.
Described symmetrical both arms orthomode coupler is two parts from the oriented partition vertical with sidewall rectangle coupling window, bottom is containing complete figuration diaphragm and longitudinal straight-through port, the shell upper surface medium position on top has the vertical fin of plane forming with symmetrical both arms coupling path, and two-part internal structure is global formation.
Described frequency diplexer is from the symmetrical subdivision of broadside of filter, and first is containing public port, and second shell one side has the fin parallel with the narrow limit of filter, and the inside diaphragm of two halves adopts integrated processing.
The present invention compared with prior art beneficial effect is:
(1) the present invention adopts polar duplex and the frequency-duplex of the structure settling signal that symmetrical both arms orthomode coupler is connected with two frequency diplexers, has solved these two conventional art difficult problems of Ku band antenna system polarization multiplexing and channeling;
(2) symmetrical both arms orthomode coupler of the present invention, adopts special figuration curve diaphragm and perceptual post, makes the present invention realize Broadband Matching, avoids asymmetry higher mode, and form is of compact construction again;
(3) frequency diplexer T connector of the present invention inside has increased tuning tooth and diaphragm, realizes the Broadband Matching of frequency diplexer;
(4) symmetrical both arms orthomode coupler of the present invention and frequency diplexer adopt integrated processing mode, reduce flange connection surface, have possessed anti-PIM ability;
(5) the symmetrical both arms orthomode coupler of the present invention and frequency diplexer have designed fin, make the present invention have high power tolerance;
(6) the present invention is after two polarized signal port access frequency diplexers of orthomode coupler, just can realize polarization frequency-duplex, this feed assembly has Broadband Matching characteristic, stronger higher mode inhibition ability, higher polarization port isolation and frequency ports isolation, and volume is little, lightweight;
(7) the present invention is applicable to be conducive under the very strict spaceborne applied environment ， space of index request and quality resource situation at full stretch the reasonable application of satellite platform, has very strong practicality and the market competitiveness.
Accompanying drawing explanation
Fig. 1 is the present invention's two multiplexing feeding link fundamental diagrams of frequency that polarize
Fig. 2 is overall structure schematic diagram of the present invention;
Fig. 3 is the symmetrical both arms orthomode coupler of the present invention overall structure schematic diagram;
Fig. 4 is the symmetrical both arms orthomode coupler of the present invention piece electrical schematic diagram;
Fig. 5 is the local electrical schematics of amplifying of the symmetrical both arms orthomode coupler of the present invention;
Fig. 6 is frequency diplexer overall structure schematic diagram of the present invention;
Fig. 7 is frequency diplexer piece electrical schematic diagram of the present invention.
Embodiment
By contrasting multiple antenna feed scheme, in conjunction with the requirement of antenna overall technology, the present invention adopts the two multiplexing feed forms of polarization frequency, parts such as symmetrical both arms orthomode coupler and frequency diplexers, consists of.As shown in Figure 1, when the same day, line was operated in accepting state, the two-wire polarized signal that loudspeaker receive quadrature is arrived polarization port separately by symmetrical both arms orthomode coupler integrated separation, then is transferred to transponder through being connected on respectively frequency diplexer receive path of each polarization port; When the same day, line was operated in emission state, the signal that transponder inputs to two kinds of polarization of antenna is input to by frequency diplexer transmission channel the polarization port connecting separately respectively, then is synthesized and gone out by loudspeaker radiation by symmetrical both arms orthomode coupler.In feeding link, the combination of symmetrical both arms orthomode coupler and frequency diplexer is exactly to realize polarization and the two multiplexing keys of frequency, is called polarization frequency-duplex feed assembly.
The present invention as shown in Figure 2, comprises symmetrical both arms orthomode coupler and two frequency diplexers, and longitudinal straight-through port of symmetrical both arms orthomode coupler is respectively connected a frequency diplexer with the synthetic port of symmetrical both arms.Each several part of the present invention all possesses Broadband Matching, high power tolerance and anti-PIM technology, to guarantee the performance of whole feed, below in conjunction with accompanying drawing, illustrates design of the present invention.
1, symmetrical both arms orthomode coupler
The present invention as shown in Figure 3, symmetrical both arms orthomode coupler comprises internal structure and shell, internal electric form as shown in Figure 4,5, comprises public square wave guide, symmetrical both arms coupling path and longitudinally leads directly to road, forming public port, the synthetic port of symmetrical both arms and longitudinal straight-through port.Symmetrical both arms coupling path is comprised of the side arm and the breeches joint that pile distribution, and longitudinally the straight-through public square wave guide of route, square square changeover portion and 90 ° of waveguide bends of E face form.In the Liang Ge side of public square wave guide symmetry, opened up two unidimensional rectangle coupling windows, the long limit of window center line overlaps with square wave guide side center line, and two windows are distinguished of connected symmetrical dendrimer both arms, and connection angle is 45 °.In the minor face midpoint of rectangle coupling window, insert the perceptual post parallel and isometric with the long limit of rectangle coupling window; Placed in the middle insertion and both sides rectangle coupling window figuration diaphragm connected vertically in public square wave guide, figuration diaphragm thickness direction is parallel with the long limit of rectangle coupling window, the linear intercepting on figuration diaphragm top is from one section of exponential function curve, the linear symmetry in both sides is consistent, bottom is rectangle, the width of rectangle is consistent with the length of side of common waveguide, and the intersection point of top exponential function curve and bottom rectangle drops on the long limit away from public port of both sides rectangle coupling window; Public square wave guide connection side square changeover portion and 90 ° of waveguide bends of E face form longitudinal straight-through port, and the breeches joint that symmetrical both arms coupling path connects insertion triangle diaphragm forms the synthetic port of symmetrical both arms.
The electrical design key of symmetrical both arms orthomode coupler is realizing the Broadband Matching of two orthogonally polarized signals and is suppressing the higher mode component that common waveguide underexcitation gets up.While adopting the symmetrical both arms orthomode coupler shown in Fig. 5, the main mould signal of quadrature (TE10 mould, TE01 mould) is by symmetric part of matrix separated transmission, and the asymmetry higher mode magnitude having encouraged is minimum; Figuration diaphragm and perceptual post can be realized the Broadband Matching of two kinds of main mould signals.As shown in Figure 4, the twin adapter end of each path connects custom-designed synthesizer (breeches joint of insertion triangle diaphragm and square square changeover portion, 90 ° of waveguide bends of E face), and main mould signal is synthetic, with the polar duplex of final settling signal; The high power examination point of symmetrical both arms orthomode coupler inside is positioned at sidewall rectangle coupling window, and the rectangle coupling window that adopts narrow side wave to lead form can guarantee enough power capacities; The PIM level of waveguide elements and the tightness degree of its flange contact facings, contact-making surface material and contact-making surface current density have relation, therefore low PIM design is mainly from the viewpoint of structural design and technological design, such as adopting integrated processing, reducing the measures such as interface quantity, special flange and linear material.
The key technology that symmetrical both arms orthomode coupler adopts specifically comprises:
(1) signal Broadband Matching and higher mode suppress
As shown in Figure 4,5, first according to the operating frequency of main mould signal, determine the size of public square wave guide, make in public square wave guide cavity simultaneously transmitting and receive two frequency band signals; Its less important consideration branched structure, adopts symmetrical both arms coupling path, can avoid producing asymmetry higher mode when the main mould signal of separated two quadratures, suppresses higher mode magnitude; At the inner figuration diaphragm that inserts of public square wave guide, the broadside of figuration diaphragm both sides and rectangle coupling window joins, and the angle of symmetrical both arms and common waveguide is 45 °, and this makes the signal Broadband Matching best results from symmetrical both arms coupled transfer; Minor face midpoint at rectangle coupling window is inserted the parallel perceptual post in Yu Chang limit, can regulate the signal Broadband Matching on longitudinally straight-through road; With the breeches joint that inserts triangle diaphragm, the twin adapter of symmetrical both arms coupling path is synthetic, 90 ° of waveguide bends of square square changeover portion and E face are synthetic by the twin adapter that longitudinally leads directly to road.
(2) high power tolerance
Under the prerequisite that can realize in working ability, the diameter of perceptual post is the smaller the better, can increase like this micro discharge surplus at coupling window place, improves power tolerance; According to structure heat, analyze and show that the thermal field of orthomode coupler distributes simultaneously, in orthomode coupler upper surface, design perpendicular fin, as shown in Figure 3, the gradual change angle of fin thickness is determined according to heat conducting directivity, guarantee that the heat energy producing because of waveguide ohmic loss when it is operated in high-power state well leaves, and prevents product surface excess Temperature.
(3) anti-PIM design
In order to increase the anti-PIM ability of orthomode coupler, when carrying out structural design, adopt the partition patterns shown in Fig. 3, symmetrical both arms orthomode coupler is two parts from the oriented partition vertical with sidewall rectangle coupling window, bottom is containing complete figuration diaphragm and longitudinal straight-through port, the shell upper surface medium position on top has the vertical fin of plane forming with symmetrical both arms coupling path, two-part internal structure is global formation, inner welding technique, the contact-making surface material of avoiding non-linear, this partition patterns makes coupler flange decreased number, to reduce waveguiding structure discontinuity, according to the relation of flange face contact area and pressure, change the shape of flange contact facings, strengthen the connection tightness of flange face.
2, frequency diplexer
Frequency diplexer adopts the form of two path filters of T-shaped waveguide connector connection, for separating of the signal of reception and transmit frequency band.As shown in Figure 6,7, the symmetrical horizontal ends both sides of T connector connect transmission channel and receive path filter by one section of straight wave guide respectively, the vertical end of T connector forms public port, at the public port place of T connector, have a pair of symmetrical H facial mask sheet, the side at the horizontal ends center of T connector near receive path filter has a tuning tooth.
Path filter adopts H facial mask sheet (inductive iris) filter, can meet like this requirement of high power work.Except aforesaid low PIM method for designing, duplexer adopts untunable form and broadside subdivision processing mode can effectively control PIM level.
The key technology that frequency diplexer adopts specifically comprises:
(1) signal Broadband Matching
First, path filter should design and reach preferably passband return loss and belt resistance inhibitor system; Secondly, after two path filters are connected with T junction, there is variation in the phase place of reflection coefficient, at this moment need to be at inner tuning tooth and the diaphragm of increasing of T junction, as shown in Figure 7, by changing shape, the position of tuning tooth and diaphragm, adjust the waveguide length of junction, carry out the variation of compensatory reflex coefficient phase place.Because influencing each other between these tuning links is more complicated, optimized variable need to be arranged to in their size, position, the passband return loss of frequency diplexer is become to optimization aim with stopband restraint measure, by pattern matching method, be optimized, realize the Broadband Matching of frequency diplexer.
(2) high power tolerance
Because filter adopts resonant cavity form, signal produces resonance at resonant cavity, and electric current additive effect is very large, therefore adopts the H face diaphragm filter shown in Fig. 7, makes the distance of waveguide internal electric field transmission maximum, to improve its micro discharge surplus; According to the thermal field of frequency diplexer, distribute simultaneously, at the Position Design fin of thermal field fastest transmission, as shown in Figure 6, can reduce parts surface temperature, protect its normal operation.
(3) anti-PIM design
Frequency diplexer, by fully optimizing and tolerance analysis, makes mismachining tolerance reach minimum to the impact of electrical property, therefore without any adjustable link, avoids the PIM causing because of discontinuity; Adopt the symmetrical subdivision (position as shown in Figure 6) of broadside, first is containing public port, and second shell one side has the fin parallel with the narrow limit of filter, and the inside diaphragm of two halves adopts integrated processing.Split surface current density is minimum, can avoid the non-linear contact-making surface electric current causing of electric field to increase sharply; Path filter diaphragm adopts integrated processing mode, and welding technique is avoided the non-linear generation PIM because of material.
Testing experiment result of the present invention is as follows:
Port performance: the actual performance that obtains feed assembly by electric performance test, standing-wave ratio < 1.3 in transmitting-receiving broadband, polarization interport isolation > 45dB, frequency ports isolation > 45dB.
High power tolerance performance: feed assembly has passed through standard that a POLARIZATION CHANNEL input pulse power is 2350W and identified that a level vacuum micro discharge tests; Passed through the power resistance test under total power input state, feed surface temperature, lower than 70 ℃, meets qualification test requirement;
Anti-PIM ability: at two-way 100W, transmit under input, when test temperature is respectively low temperature (55 ℃), room temperature, high temperature (+142 ℃), the 7 rank be less than-194dBc of PIM product that the port being connected with transponder input at feed assembly records.
The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (4)
1. the high-power DiPIM of Ku frequency range broadband polarization frequency-duplex feed assembly, it is characterized in that: by symmetrical both arms orthomode coupler and two frequency diplexers, formed, described symmetrical both arms orthomode coupler comprises internal structure and shell, described internal structure comprises public square wave guide, symmetrical both arms coupling path and longitudinally straight-through road, form public port, the synthetic port of symmetrical both arms and longitudinally straight-through port, the Liang Ge side symmetry of described public square wave guide is opened up two unidimensional rectangle coupling windows, the long limit of rectangle coupling window center line overlaps with the center line of public square wave guide side minor face, two rectangle coupling windows are of two symmetrical both arms of connected symmetrical dendrimer both arms coupling paths respectively, the angle of rectangle coupling window and symmetrical both arms is 45 °, in the minor face midpoint of rectangle coupling window, insert the perceptual post parallel and isometric with the long limit of rectangle coupling window, placed in the middle insertion and both sides rectangle coupling window figuration diaphragm connected vertically in public square wave guide, the thickness direction of figuration diaphragm is parallel with the long limit of rectangle coupling window, the linear intercepting on described figuration diaphragm top is from one section of exponential function curve, the linear symmetry in both sides is consistent, bottom is rectangle, the width of rectangle is consistent with the length of side of public square wave guide, the intersection point of top exponential function curve and bottom rectangle drops on the long limit away from public port of both sides rectangle coupling window, public square wave guide connection side square changeover portion and 90 ° of waveguide bends of E face form longitudinal straight-through port, the breeches joint that symmetrical both arms coupling path connects insertion triangle diaphragm forms the synthetic port of symmetrical both arms, longitudinally straight-through port is respectively connected a frequency diplexer with the synthetic port of symmetrical both arms.
2. the high-power DiPIM of a kind of Ku frequency range according to claim 1 broadband polarization frequency-duplex feed assembly, it is characterized in that: described frequency diplexer is that transmission channel filter and receive path filter form by T connector and two path filters, transmission channel filter and receive path filter adopt H face patching, the symmetrical horizontal ends both sides of T connector connect transmission channel filter and receive path filter by one section of straight wave guide respectively, the vertical end of T connector forms public port, at the public port place of T connector, there is a pair of symmetrical H facial mask sheet, a side at the horizontal ends center of T connector near receive path filter has a tuning tooth.
3. the high-power DiPIM of a kind of Ku frequency range according to claim 1 broadband polarization frequency-duplex feed assembly, it is characterized in that: described symmetrical both arms orthomode coupler is two parts from the oriented partition vertical with sidewall rectangle coupling window, bottom is containing complete figuration diaphragm and longitudinal straight-through port, the shell upper surface medium position on top has the vertical fin of plane forming with symmetrical both arms coupling path, and two-part internal structure is global formation.
4. the high-power DiPIM of a kind of Ku frequency range according to claim 2 broadband polarization frequency-duplex feed assembly, it is characterized in that: described frequency diplexer is from the symmetrical subdivision of broadside of filter, first is containing public port, second shell one side has the fin parallel with the narrow limit of filter, and the inside diaphragm of two halves adopts integrated processing.
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| CN105206898B (en) * | 2012-07-04 | 2018-11-30 | 华为技术有限公司 | Microwave telecommunication devices and microwave telecommunication system |
| CN103703609B (en) * | 2012-07-04 | 2015-09-09 | 华为技术有限公司 | Microwave telecommunication devices and microwave telecommunication system |
| CN104681898B (en) * | 2015-01-21 | 2017-11-10 | 江苏贝孚德通讯科技股份有限公司 | A kind of integrated polarization multiplexing duplex component |
| CN105024175B (en) * | 2015-08-18 | 2018-06-08 | 中国电子科技集团公司第五十四研究所 | A kind of four port feeding network of Ku broadbands linear polarization |
| CN105186085B (en) * | 2015-10-10 | 2018-06-08 | 中国电子科技集团公司第五十四研究所 | Four port Microwave Net of Ka broadbands circular polarisation |
| CN106027141B (en) * | 2016-07-06 | 2021-11-23 | 安徽四创电子股份有限公司 | Satellite communication duplex assembly for communication in motion |
| CN106571521B (en) * | 2016-10-31 | 2019-06-14 | 上海无线电设备研究所 | A kind of high temperature resistant antenna |
| CN106450635B (en) * | 2016-12-08 | 2021-10-01 | 江苏贝孚德通讯科技股份有限公司 | Integrated microwave waveguide coupler |
| CN110581364B (en) * | 2019-08-27 | 2024-04-05 | 航天恒星空间技术应用有限公司 | Polarization tracker for communication in motion |
| CN110775307A (en) * | 2019-10-09 | 2020-02-11 | 中国空间技术研究院 | High-flux satellite transponder equipment layout |
| CN112563710B (en) * | 2020-12-07 | 2022-02-01 | 江苏亨通太赫兹技术有限公司 | E-band orthogonal mode coupler |
| CN112670682A (en) * | 2020-12-24 | 2021-04-16 | 人民华智通讯技术有限公司 | Medium duplexer based on novel common cavity structure |
| CN113258234B (en) * | 2021-04-16 | 2022-02-18 | 深圳大学 | Resonant cavity waveguide filter |
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