CN108365308B - Dielectric waveguide filter and mounting method thereof - Google Patents
Dielectric waveguide filter and mounting method thereof Download PDFInfo
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- CN108365308B CN108365308B CN201810112439.1A CN201810112439A CN108365308B CN 108365308 B CN108365308 B CN 108365308B CN 201810112439 A CN201810112439 A CN 201810112439A CN 108365308 B CN108365308 B CN 108365308B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/2002—Dielectric waveguide filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/007—Manufacturing frequency-selective devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/087—Transitions to a dielectric waveguide
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Abstract
The invention discloses a dielectric waveguide filter, which comprises a plurality of dielectric blocks which are arranged in a stacked mode and metal coupling holes which are embedded into the dielectric blocks from head to tail; a metal layer covers the surface of each dielectric block; the metal layer on the end part dielectric block is respectively provided with an isolation groove and a transmission line penetrating through the isolation groove; the transmission line extends to the bottom surface of the dielectric block to form a welding part; the transmission line divides the coupling window into two coupling slits. The invention also discloses a mounting method of the dielectric waveguide filter. The invention effectively reduces the volume of the dielectric waveguide filter and is beneficial to being used in a large-scale integrated system.
Description
Technical Field
The invention relates to the technical field of installation of dielectric waveguide filters, in particular to a dielectric waveguide filter and a mounting method thereof.
Background
The waveguide filter generally comprises a discontinuous waveguide and a transmission line (such as a pin, a diaphragm, and the like), wherein the discontinuous structure generates a higher-order mode, the effect on the main mode TE10 is equivalent to a reactance, and the transmission line segment can be equivalent to a resonant cavity. The waveguide filter is widely applied to systems of microwave millimeter wave communication, satellite communication and the like and military electronic products requiring high-performance filtering characteristics.
The dielectric filter, also called ceramic dielectric filter, is composed of dielectric resonators mounted in metal cavities. The dielectric filter has the main advantages of large power capacity and low insertion loss, but has two defects of large volume, and occupies large volume compared with an integrated circuit in centimeter magnitude; second, dielectric filters are typically discrete devices that cannot be integrated with signal processing circuitry.
The dielectric waveguide filter is a new filter formed by metallizing the surface of a dielectric block and directly forming the filter and having the characteristics of both the waveguide filter and the dielectric filter. As shown in fig. 1, a conventional dielectric waveguide filter includes a plurality of resonators connected in series or in parallel, each of the resonators is formed by a dielectric block covered with a metal layer, and a coupling structure is provided in two adjacent dielectric blocks so that the plurality of dielectric blocks can couple signals with each other to realize the function of the filter, and the specific coupling structure is the same as the coupling structure described in patent US8,823,470B2.
Dielectric waveguide filters have the advantages of both waveguide filters and dielectric filters, but like other filters, require the use of more connecting elements to connect with other elements in the system. More importantly, the dielectric waveguide filter must use a coaxial connector (e.g., an RF connector, a coaxial line core wire, etc., which is one of the most commonly used coaxial connectors) to transmit high frequency energy into and out of the waveguide by electrically or magnetically coupling the coaxial line with the waveguide. However, the coaxial connector is large in volume and occupies a large amount of space, compared to the volume of the dielectric waveguide filter itself. As shown in fig. 1, the dielectric waveguide filter is connected to the coaxial connector 1, and the coaxial connector 1 occupies a certain space, and the dielectric waveguide filter connected thereto increases the overall volume due to the presence of the coaxial connector when connected to other components, which not only increases the overall volume, but also increases the use cost due to the necessity of using the coaxial connector. Therefore, it is necessary to provide a new dielectric waveguide filter and a mounting method thereof.
Disclosure of Invention
The invention aims to provide a mounting method of a dielectric waveguide filter, which aims to solve the problem that the existing coaxial connector occupies a large space.
The mounting method of the dielectric waveguide filter in the scheme comprises the following steps:
overlapping a plurality of dielectric blocks covered with metal layers to form a waveguide filter;
step two, a coupling window is arranged on a dielectric block at the end part of the waveguide filter;
step three, arranging a transmission line which penetrates through the coupling window and is used for transmitting an electric signal to the end part dielectric block on the outer side metal layer of the end part dielectric block;
step four, extending the transmission line to the bottom surface of the end part dielectric block to form a welding part;
and step five, mounting the welding part on the PCB.
The noun explains:
end dielectric block: the two dielectric blocks located at both ends of all the dielectric blocks, that is, the outermost two dielectric blocks among all the dielectric blocks overlapped, are provided with a soldering part as input and output of the dielectric waveguide filter, respectively.
The principle and the effect are as follows:
the method abandons the existing universal connector, directly changes the connection structure of the metal layer on the end part dielectric block, enables the interior of the dielectric waveguide filter to be capable of carrying out energy coupling with the coupling window on the end part dielectric block through the coupling window, and then directly connects the dielectric waveguide filter with the PCB through the welding part formed by the transmission line, so that the energy can be directly transmitted into the dielectric block in the dielectric waveguide filter through the transmission line and the coupling window connected with the transmission line on the basis of not using an RF connector. And because the welding part is arranged at the bottom of the dielectric block, the whole dielectric waveguide filter can be directly attached to a PCB, so that a connector is directly omitted, the occupied space of the connector is saved, and the cost for using the connector is also saved. The method also enables the dielectric waveguide filter and the PCB to be mutually laminated through mounting, thereby further saving the whole occupied space. More importantly, the working quality of the dielectric waveguide filter mounted by the method is not influenced at all, and the energy loss caused by using a connector is saved.
By the method, the problem that the existing RF connector occupies a large space is effectively solved, the dielectric waveguide filter installed by the method is smaller in integral volume, and the method is more beneficial to use of a large-scale multi-antenna system.
Furthermore, in the second step, an isolation groove is formed on the end face of the end part dielectric block, a metal coupling hole which is perpendicular to the transmission line and connected with the transmission line is formed in the isolation groove, and a metal layer communicated with the transmission line is covered in the metal coupling hole; the metal coupling holes and the isolation trenches together form a coupling window of the end dielectric block.
And realizing electric field coupling in the dielectric block by the metal coupling hole covered with the metal layer. The current signal passes through the metal coupling hole to excite the electromagnetic field distribution, usually the TE mode, required by the filter to work inside the dielectric block. The metal coupling hole can be a blind hole or a through hole, because metal is filled in the metal coupling hole, when the metal coupling hole is a through hole, the metal material filled in the metal coupling hole can be used as a metal coupling column.
Further, in the second step, an isolation groove and a coupling slit communicated with the isolation groove are formed on the end face of the end part medium block; the transmission line penetrates through the coupling slit and the isolation groove and is communicated with the metal layer of the end dielectric block; the coupling slit is vertical to the transmission line; the coupling slits and the isolation grooves together form a coupling window of the end dielectric block.
The transmission line on the dielectric block and the coupling slit perpendicular to the transmission line together form a signal transmission path. When the filter and the PCB are soldered, an electric signal is transmitted from the soldering portion into the transmission line, and a current signal is directly connected to the ground through the transmission line, and a displacement current is generated in the coupling slit due to the presence of the coupling slit, thereby generating an electromagnetic field distribution, generally a TE mode, required for the operation of the filter in the dielectric block. Therefore, the dielectric waveguide filter formed by the plurality of dielectric blocks can carry out energy coupling by itself without using an RF connector, external energy can be transmitted into the internal dielectric block and transmitted out of the internal dielectric block, energy can be transmitted into the internal dielectric block of the dielectric waveguide filter only by the welding part formed by the transmission line on the premise of not using the RF connector, the whole dielectric waveguide filter can have a current signal to pass through, and an electromagnetic field can be formed under the action of the current signal to screen waves passing through the dielectric waveguide filter.
Further, in step five, if the PCB board is perpendicular to the coupling slit, a shielding cover for shielding the coupling slit is covered on the metal layer of the end dielectric block.
The actual access system of the dielectric waveguide filter and the structure of the PCB are different, and if the PCB surface is vertical to the coupling slit surface, the electric field leakage is prevented by the shielding cover.
Another object of the present invention is to provide a dielectric waveguide filter mounted by the above method.
The dielectric waveguide filter in the scheme comprises a plurality of dielectric blocks which are arranged in a stacked mode; each dielectric block is covered with a metal layer, and one overlapped surface of each dielectric block is provided with a coupling structure for constructing discontinuous waveguide and realizing signal coupling in the dielectric block; the end dielectric block is provided with a coupling window and a transmission line which penetrates through the coupling window and is used for transmitting an electric signal to the end dielectric block, and the transmission line extends to the bottom surface of the end dielectric block to form a welding part.
The principle and the effect are as follows:
according to the scheme, the metal layer is directly covered on the dielectric block, the coupling window is formed in the metal layer of the end dielectric block, and then the coupling structure of the inner dielectric block enables the inner dielectric block and the end dielectric block to be capable of energy coupling, so that the welding part arranged on the end dielectric block replaces a connector which needs to be used originally, the connector can be connected with other elements, and the external energy can be directly transmitted into the ceramic dielectric block through the coupling window. The invention is more convenient to use and occupies smaller volume after being installed. The dielectric blocks are arranged in a stacked mode, the area of each dielectric block can be reduced, the size of the whole dielectric waveguide filter is further reduced, and the dielectric waveguide filter is more suitable for being applied to a large-scale integrated system.
Further, the coupling window of the end dielectric block comprises an isolation groove arranged on the metal layer and a metal coupling hole which is arranged in the isolation groove and is vertical to the isolation groove; the metal coupling hole is covered with a metal layer and is vertically connected with the transmission line through the metal layer.
And realizing electric field coupling in the dielectric block by the metal coupling hole covered with the metal layer.
Further, the coupling window of the end dielectric block comprises an isolation groove arranged on the metal layer and a coupling slit communicated with the isolation groove; the transmission line is connected with the metal layer of the end dielectric block and penetrates through the coupling slit and the isolation groove, and the transmission line divides the coupling slit into a left coupling slit and a right coupling slit which are symmetrical.
The welding part enables the electric signals transmitted by the PCB to pass through the current on the transmission line, displacement current is formed in the coupling slit, and the displacement current excites a needed electric field in the dielectric block.
Drawings
Fig. 1 is a schematic structural diagram of a conventional dielectric waveguide filter connection method.
Fig. 2 is a schematic structural view of a dielectric waveguide filter in embodiments 1 and 2 of the present invention.
Fig. 3 is a schematic view of a mounting structure of a dielectric waveguide filter in embodiment 3 of the present invention.
Fig. 4 is a schematic structural view of a dielectric waveguide filter in embodiment 3 of the present invention.
Fig. 5 is a schematic structural view of embodiment 3 of the present invention with a shielding cover added.
Detailed Description
Reference numerals in the drawings of the specification include: the coaxial connector comprises a coaxial connector 1, a dielectric block 2, a PCB 3, a metal layer 4, a welding part 5, a coupling slit 6, an isolation groove 7, a metal grounding hole 8, a coupling column 9, a transmission line 10 and a shielding cover 11.
Example 1
As shown in fig. 2, the dielectric waveguide filter in the present embodiment includes 4 dielectric blocks arranged in a stack; each dielectric block is covered with a metal layer, one surface of each dielectric block, which is overlapped with each other, is provided with a coupling structure (a metalized through hole or openings are formed on the adjacent metal layers of the two adjacent dielectric blocks, so that the dielectric parts in the two dielectric blocks can form a coupling channel correspondingly with each other), discontinuous waveguides are formed among the plurality of dielectric blocks, and the discontinuous waveguides can be connected together to perform complete waveguide transmission through the coupling channel formed on the dielectric blocks. The end dielectric block is provided with a coupling window and a transmission line which penetrates through the coupling window and is used for transmitting an electric signal to the end dielectric block, and the transmission line extends to the bottom surface of the end dielectric block to form a welding part.
The coupling window cut on the end dielectric block comprises an isolation groove formed in the metal layer and a metal coupling column arranged in the isolation groove and perpendicular to the isolation groove, and the metal coupling column is perpendicularly connected with the transmission line. And the metal coupling column realizes electric field coupling in the dielectric block through the metal coupling column.
When the dielectric waveguide filter in this embodiment is mounted, the following mounting method is adopted:
firstly, overlapping a plurality of dielectric blocks 2 covered with metal layers 4, and arranging a coupling structure for realizing energy coupling on the metal layer 4 of each dielectric block 2, specifically, arranging a metalized through hole in each dielectric block, and forming a coupling channel in a dielectric waveguide filter by using the metalized through holes opposite to each other, so that the dielectric blocks in the dielectric waveguide filter can carry out waveguide transmission, which belongs to the prior art and is not described herein.
Step two, arranging a coupling window of a shaft connector, which is used for replacing an RF connector, on an end part dielectric block of the waveguide filter; an isolation groove is formed in the end face of the end part dielectric block, a metal coupling column perpendicular to the isolation groove is arranged in the middle of the isolation groove, the metal coupling column extends into the end part dielectric block along the waveguide transmission direction, and the metal coupling column and the isolation groove form a coupling window of the end part dielectric block together.
Step three, on the metal layer of the end dielectric block, a transmission line which penetrates through the coupling window and is vertically connected with the metal coupling column is arranged in the coupling window, and the transmission line is a part of the metal layer on the end dielectric block divided by the isolation groove;
step four, extending the transmission line to the bottom surface of the end part dielectric block to form a welding part;
and step five, mounting the welding part on the PCB.
The transmission line 10 and the isolation slot 7 can generate the required electric field in the dielectric block 2, the present embodiment directly uses part of the metal layer on the end dielectric block as the transmission line, completely replaces the RF connector, and directly passes through the transmission line and the coupling window connected with the transmission line, can generate waveguide excitation in the dielectric block, so that the transmission line and the coupling window can transmit the external energy into the dielectric block. In the embodiment, the dielectric blocks 2 are overlapped, so that compared with the conventional dielectric waveguide filter in fig. 1, the transverse area is saved, the transverse area of the whole dielectric waveguide filter is reduced, and the integration of a plurality of dielectric waveguide filters in the whole system is facilitated.
Example 2
Different from the embodiment 1, the dielectric waveguide filter in the embodiment includes a coupling window cut on the end dielectric block, including an isolation groove disposed on the metal layer and a metal coupling hole disposed in the isolation groove and perpendicular to the isolation groove; the metallic coupling holes may be considered as blind holes coated with a metal layer, and the metallic coupling posts may be considered as through holes coated with a metal layer. The metal coupling hole is covered with a metal layer and is vertically connected with the transmission line through the metal layer. And realizing electric field coupling in the dielectric block by the metal coupling hole covered with the metal layer.
When the dielectric waveguide filter is installed, the difference is that in the second step, an isolation groove is formed on the end face of the end part dielectric block, a metal coupling hole which is perpendicular to the transmission line and is connected with the transmission line is formed in the isolation groove, and a metal layer communicated with the transmission line is covered in the metal coupling hole; the metal coupling holes and the isolation trenches together form a coupling window of the end dielectric block. And realizing electric field coupling in the dielectric block by the metal coupling hole covered with the metal layer. The current signal passes through the metal coupling hole to excite the electromagnetic field distribution, usually the TE mode, required by the filter to work inside the dielectric block.
Example 3
As shown in fig. 3 and 4, unlike embodiment 1, the dielectric waveguide filter in this embodiment has a coupling window cut in an end dielectric block, and includes an isolation groove provided in a metal layer and a coupling slit communicating with the isolation groove; the transmission line is connected with the metal layer of the end dielectric block and penetrates through the coupling slit and the isolation groove, and the transmission line divides the coupling slit into a left coupling slit and a right coupling slit which are symmetrical. The welding part enables the electric signals transmitted by the PCB to pass through the current on the transmission line, displacement current is formed in the coupling slit, and the displacement current excites a needed electric field in the dielectric block.
When the dielectric waveguide filter is installed, in the second step, an isolation groove and a coupling slit communicated with the isolation groove are formed on the end face of the end part dielectric block; the transmission line penetrates through the coupling slit and the isolation groove and is communicated with the metal layer of the end dielectric block; the coupling slit is vertical to the transmission line; the transmission line 10 divides the coupling slot 6 into symmetrical left and right coupling slots 6, 6. The coupling slits and the isolation grooves together form a coupling window of the end dielectric block.
The transmission line on the dielectric block and the coupling slit perpendicular to the transmission line together form a signal transmission path. When the filter and the PCB are soldered, an electric signal is transmitted from the soldering portion into the transmission line, and a current signal is directly connected to the ground through the transmission line, and a displacement current is generated in the coupling slit due to the presence of the coupling slit, thereby generating an electromagnetic field distribution, generally a TE mode, required for the operation of the filter in the dielectric block. Therefore, the dielectric waveguide filter formed by the plurality of dielectric blocks can carry out energy coupling by itself without using an RF connector, external energy can be transmitted into the internal dielectric block and transmitted out of the internal dielectric block, energy can be transmitted into the internal dielectric block of the dielectric waveguide filter only by the welding part formed by the transmission line on the premise of not using the RF connector, the whole dielectric waveguide filter can have a current signal to pass through, and an electromagnetic field can be formed under the action of the current signal to screen waves passing through the dielectric waveguide filter.
As shown in fig. 4, two rectangular coupling slots 6 are formed in the metal layer 4, the two rectangular coupling slots 6 are respectively communicated with one isolation slot 7, and a transmission line 10 formed on the soldering portion 5 is arranged in the middle of the slot. Of course, it can also be considered that a "T" shaped coupling window is formed on the metal layer 4, the "T" shaped coupling window includes two coupling windows which are communicated with each other in the horizontal direction and the vertical direction, a transmission line 10 which penetrates through the vertically arranged window vertically extends into the window in the horizontal direction, the transmission line 10 divides the whole "T" shaped coupling window into two groups of coupling windows which are communicated with each other, and each group of coupling windows includes a rectangular coupling slit 6 and an isolation slot 7. The transmission line 10 extends from the side surface of the dielectric block 2 to the bottom surface of the dielectric block 2, and the transmission line 10 forms a soldering portion 5 where the metal layer 4 is soldered to the PCB board 3.
When a current flows through the transmission line 10, a displacement current is generated in the two slits on the side surfaces, and the displacement current excites an electric field required by the filter inside the dielectric block 2.
The face of the isolation slot 7 may overlap the PCB 3 or be perpendicular to the PCB 3, depending on the particular configuration of the system in which it is used. Since the metal layer 4 covers from the side surface of the dielectric block 2 up to the bottom surface of the dielectric block 2, the dielectric waveguide filter can be bonded by the bonding portion 5 on either the side surface or the bottom surface.
According to practical conditions, when the PCB 3 is perpendicular to the isolation groove 7, the isolation groove 7 is covered with a shielding cover 11 for preventing an electric field in the isolation groove 7 from leaking. Wherein the shield cover 11 may be formed with a partially metallized dielectric block 2. As shown in fig. 5, in the case where the coupling slit 6 is located on a plane perpendicular to the PCB 3 (i.e. when the isolation slot 7 is not attached to the PCB 3), the isolation slot 7 is covered with a shielding cover 11 for reducing electric field leakage in the isolation slot 7. This shielding cover 11 may be a dielectric block 2 partially coated with a metal layer 4. The dielectric block 2 covering the isolation trench 7 may integrate a low pass filter.
The bottom end of the shielding cover 11 is provided with a notch for exposing the transmission line 10, so that the filter and the PCB 3 can be conveniently welded by SMT. The shielding cover 11 shields the electric field of the isolation slot 7 without preventing the transmission line 10 from being connected to other structures through the soldering portion 5.
Compared with the traditional connecting method of the dielectric waveguide filter integrated by adopting the connector and the system, the dielectric waveguide filter connected by the method has the advantages of small integral volume, light weight, low cost and convenient and easy installation. The surface mounting method is suitable for surface mounting on the PCB (printed circuit board) 3 directly, is favorable for improving the integration level of the whole system, and is particularly suitable for a large-scale multi-antenna system needing to be provided with a plurality of filters.
In each of examples 1 to 3, the filter and the PCB board 3 were connected by a direct Surface Mount Technology (SMT) without using any connector. The surface of the medium block 2 is welded with the PCB 3 by a welding part 5. The connector in the middle is reduced, the whole dielectric waveguide filter is directly connected with the PCB 3 through the welding part 5, the welding part 5 is small in size and small in occupied space, the welding part 5 is directly manufactured on the surface of the dielectric filter, the occupied space is not occupied, and the welding part 5 is directly connected with the transmission line 10 on the surface of the filter to serve as the input end or the output end of the whole dielectric waveguide filter.
Through the metalized through holes arranged in all the dielectric blocks or other coupling structures with the same functions, coupling channels are formed among the plurality of internal dielectric blocks, so that all the dielectric blocks can be coupled through selective energy to form a filter with frequency selectivity.
As shown in fig. 3, the metal layer 4 of the end dielectric block 2 serves as a ground plane, and the connecting wire on the metal layer 4 extends to the bottom surface of the dielectric block 2 to form a welding part 5, so that the PCB 3 is directly welded on the bottom surface of the dielectric block 2, thereby effectively saving the occupied space.
As shown in fig. 2, a circular isolation groove 7 is formed in the metal layer 4, a coupling post 9 (or only a metal coupling hole coated with the metal layer 4) extending into the dielectric block 2 is connected to a center position of the circular isolation groove 7, and a transmission line 10 is connected to an outer end surface of the coupling post 9. The transmission line 10 extends from the end surface of the dielectric block 2 to the bottom surface of the dielectric block 2 to form the welded portion 5. The coupling column 9 is connected to the welding part 5 through a transmission line 10 positioned on the surface of the dielectric block 2, and the welding part 5 is connected with the PCB 3, so that the current transmitted through the PCB 3 can couple the energy into the dielectric filter through the welding part 5, the transmission line 10 and the coupling column 9, and then the energy is output to the PCB 3 through the output end of the dielectric waveguide filter.
After the filter and the PCB are soldered, the current signal is transmitted from the soldering portion 5 into the transmission line 10. The current signal excites the electromagnetic field distribution, typically TE mode, required for the filter to operate inside the dielectric block 2 through the coupling post 9 (or metal coupling hole).
Test example 1:
the dielectric waveguide filters produced in examples 1 to 3 were respectively compared with the existing dielectric waveguide filter after being installed in the same waveguide transmission system, and the respective frequency graphs were measured, and the measured results showed that the average value of S22 was the largest and the transmission characteristic was the best in example 3 (waveguide filter with slit in coupling window), the average value was the smallest in S11 and S22 when there is waveguide transmission, indicating that the reflection loss in the operating frequency was the smallest, the insertion loss was the largest, the reflection loss was the smallest and the transmission efficiency was the highest in the dielectric waveguide filter in example 3, which is the dielectric waveguide filter with the best quality, while the reflection loss of the dielectric waveguide filters in examples 1 and 2 was larger and the transmission efficiency was lower than that in example 1, but the reflection loss of the dielectric waveguide filters in examples 1 and 2 was smaller than that in proportion, the transmission efficiency is high. In summary, the dielectric waveguide filters produced in embodiments 1 to 3 are superior to the existing dielectric waveguide filters.
Test example 2
Dielectric waveguide filters mounted and formed in accordance with the methods in embodiments 1 to 3 and dielectric waveguide filters connected to a system with existing connectors are subjected to volume and cost comparison. The dielectric waveguide filters of examples 1 to 3 have almost the same overall volume after mounting, whereas the conventional dielectric waveguide filters have a volume almost 2 times as large as that of each of the filters of examples 1 to 3 after mounting, and such a difference in volume becomes more and more significant as the number of filters used increases. Moreover, the use cost of the existing dielectric waveguide filter is much higher than that of the filters in embodiments 1 to 3. Since both the input and output terminals of the conventional dielectric waveguide filter need to be connected to the PCB board 3, 2 connectors are required. The occupied space of the connector is related to the type number of the connector selected by a customer, in the test, the smallest connector on the market is selected, but compared with the dielectric waveguide filter installed by the method, the occupied space of the length of the side of the PCB 3 is increased by 5-10 mm; the two connector losses increase by at least 0.15 dB. The loss increase is even greater if one considers the adapter interconnected with the system. The cost of the connector is 15 yuan each, two are 30 yuan, and the dielectric waveguide filter mounted in the embodiments 1 to 3 does not need to use the connector, so the mounting cost is much lower than the existing mounting cost, which is beneficial to using the dielectric waveguide filter in a large scale, especially for some large-scale antenna systems, and the cost can be effectively saved.
For a traditional metal cavity filter, the size of the filter is large, and the size of the radio frequency connector is almost negligible compared with the size of the filter. For the dielectric waveguide filter, the size of the filter is very small, and the proportion of the volume of the radio frequency connector is very considerable and cannot be ignored. In a 5G massive multiple input multiple output antenna system (MassiveMIMO), each antenna element needs to have a filter, and the antenna elements of the conventional system have 64, 128, or even 256 or higher. Such systems are very sensitive to the size and cost of the filter. In the original interconnection scheme, two RF connectors are needed for each filter, even if the cost of each connector is 10RMB, the cost of the connector on the filter is up to 1280 yuan for a 64-array-element system, and if the interconnection part on a system PCB is added, the cost is higher. The invention saves the connector by changing the structure of the filter, greatly reduces the use cost of the filter and effectively reduces the installation volume of the filter.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (5)
1. The mounting method of the dielectric waveguide filter is characterized in that: the method comprises the following steps:
overlapping a plurality of dielectric blocks covered with metal layers to form a waveguide filter;
step two, a coupling window is arranged on a dielectric block at the end part of the waveguide filter;
step three, arranging a transmission line which penetrates through the coupling window and is used for transmitting an electric signal to the end part dielectric block on the outer side metal layer of the end part dielectric block;
step four, extending the transmission line to the bottom surface of the end part dielectric block to form a welding part;
step five, mounting the welding part on the PCB;
in the second step, an isolation groove and a coupling slit communicated with the isolation groove are formed on the end face of the end part medium block; the transmission line penetrates through the coupling slit and the isolation groove and is communicated with the metal layer of the end dielectric block; the coupling slit is vertical to the transmission line; the coupling slits and the isolation grooves together form a coupling window of the end dielectric block.
2. A mounting method for a dielectric waveguide filter according to claim 1, wherein: in the second step, an isolation groove is formed on the end face of the end part dielectric block, a metal coupling hole which is perpendicular to the transmission line and connected with the transmission line is formed in the isolation groove, and a metal layer communicated with the transmission line is covered in the metal coupling hole; the metal coupling holes and the isolation trenches together form a coupling window of the end dielectric block.
3. A mounting method for a dielectric waveguide filter according to claim 1, wherein: in step five, if the PCB board is perpendicular to the coupling slit, a shielding cover for shielding the coupling slit is covered on the metal layer of the end dielectric block.
4. A dielectric waveguide filter, characterized by: comprises a plurality of dielectric blocks arranged in a stacked manner; each dielectric block is covered with a metal layer, and one overlapped surface of each dielectric block is provided with a coupling structure for constructing discontinuous waveguide and realizing signal coupling in the dielectric block; the end part dielectric block is provided with a coupling window and a transmission line which penetrates through the coupling window and is used for transmitting an electric signal to the end part dielectric block, and the transmission line extends to the bottom surface of the end part dielectric block to form a welding part;
the coupling window of the end dielectric block comprises an isolation groove arranged on the metal layer and a coupling slit communicated with the isolation groove; the transmission line is connected with the metal layer of the end dielectric block and penetrates through the coupling slit and the isolation groove, and the transmission line divides the coupling slit into a left coupling slit and a right coupling slit which are symmetrical.
5. A dielectric waveguide filter according to claim 4, wherein: the coupling window of the end dielectric block comprises an isolation groove arranged on the metal layer and a metal coupling hole which is arranged in the isolation groove and is vertical to the isolation groove; the metal coupling hole is covered with a metal layer and is vertically connected with the transmission line through the metal layer.
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| CN109449546B (en) * | 2018-11-08 | 2023-09-29 | 京信通信技术(广州)有限公司 | Dielectric waveguide filter and input/output structure thereof |
| CN109560355B (en) * | 2018-12-28 | 2024-05-14 | 重庆思睿创瓷电科技有限公司 | Dielectric body for 5G communication, dielectric waveguide filter, radio frequency module and base station |
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