CN112002966A - Open zero point of filter, duplexer and combiner - Google Patents
Open zero point of filter, duplexer and combiner Download PDFInfo
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- CN112002966A CN112002966A CN202010637517.7A CN202010637517A CN112002966A CN 112002966 A CN112002966 A CN 112002966A CN 202010637517 A CN202010637517 A CN 202010637517A CN 112002966 A CN112002966 A CN 112002966A
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- cavity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/06—Cavity resonators
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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
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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
- H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
- H01P1/2138—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using hollow waveguide filters
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Abstract
The invention discloses an open zero point of a filter, a duplexer and a combiner, which comprises a cavity, a capacitance flying rod and an input copper sheet, wherein a cover plate is arranged at the upper end of the cavity, a cover plate fixing screw is arranged on the cover plate, and the cover plate fixing screw penetrates through the cover plate and is connected with the cavity through threads. Has the advantages that: the coupling between the two resonant cavities can be amplified in the actual process by arranging the open cavity and opening all the windows between the three resonant cavities to enhance the coupling, and the required window width can be reduced by using the two-point structure of the open window, so that the processing mode of the cavity is simpler and more convenient, the coupling amplification is easier to realize and easy to control, and the cavity is very practical; and the structure of the capacitance flying rod support piece enables the height of the boss on the side surface of the capacitance flying rod support piece to be greatly changed in capacitance value, and meanwhile, the length of the capacitance flying rod is adjusted to obtain another resonance point, so that two zero point forms are obtained through one capacitance structure, and the structure of the cavity is further simplified.
Description
Technical Field
The invention relates to the technical field of construction trolley resonance equipment, in particular to an open zero of a filter, a duplexer and a combiner.
Background
The resonant cavity is a metal cavity in which a high-frequency electromagnetic field is continuously oscillated. The electromagnetic field is completely concentrated in the cavity, so that no radiation loss exists, and the quality factor is higher. The types of resonators are many, the most common being rectangular resonators and cylindrical resonators. Within the cavity, the electromagnetic field may oscillate at a range of frequencies, the magnitude of which is related to the shape, geometry and mode of resonance of the cavity. When two or more circuits form a network, if the current or voltage in one circuit changes, the other circuit also changes similarly, and the network is called a coupling circuit. The coupling functions to transfer (or convert) the energy of one circuit to another circuit. The cavity of the resonator is a very important component.
The cavity used by the existing resonator needs to be opened to the maximum due to the strong coupling ratio between the windows of the resonant cavities, and the two resonators need to be connected to achieve strong coupling, so that the cavity processing difficulty is large, the coupling amplification is difficult to control, and the practicability is not enough.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide an open zero for a filter, a duplexer, and a combiner.
The invention realizes the purpose through the following technical scheme:
the open zero point of the filter, the duplexer and the combiner comprises a cavity, a capacitor flying rod and an input copper sheet, wherein a cover plate is arranged at the upper end of the cavity, a cover plate fixing screw is arranged on the cover plate, the cover plate fixing screw penetrates through the cover plate and the cavity to be in threaded connection, a capacitor flying rod supporting piece is arranged on one side of the middle in the cavity, the capacitor flying rod is arranged at the upper end of the capacitor flying rod supporting piece, the capacitor flying rod fixing screw is arranged at the middle of the upper end of the capacitor flying rod, the input copper sheet is arranged on one side of the capacitor flying rod, the capacitor flying rod is far away from one side of the input copper sheet and is provided with an output copper sheet, tuning screws are arranged on the other side.
Furthermore, an input copper sheet fixing screw is arranged at the upper end of the input copper sheet, the input copper sheet fixing screw penetrates through the input copper sheet and is in threaded connection with the cavity, and the input copper sheet is connected with the cavity through the input copper sheet fixing screw.
By adopting the technical scheme, the input copper sheet is fixed on the cavity through the input copper sheet fixing screws, and the input copper sheet fixing screws can be conveniently screwed off from the cavity so as to be conveniently detached from the cavity.
Furthermore, one end, far away from the input copper sheet fixing screw, of the input copper sheet is connected with an input connecting column through a clamping groove, the input connecting column penetrates through the side wall of the cavity, and an input connector formed in the cavity is arranged on the periphery of one end, penetrating through the side wall of the cavity, of the input connecting column.
By adopting the technical scheme, the input joint is connected with the input copper sheet through the input connecting column, so that an external part can be connected with the input copper sheet through the input joint.
Furthermore, an output copper sheet fixing screw is arranged at the upper end of the output copper sheet, the output copper sheet fixing screw penetrates through the output copper sheet and is in threaded connection with the cavity, and the output copper sheet is connected with the cavity through the output copper sheet fixing screw.
By adopting the technical scheme, the output copper sheet is fixed on the cavity through the output copper sheet fixing screws, and the output copper sheet fixing screws can be conveniently screwed off from the cavity so as to detach the output copper sheet from the cavity.
Furthermore, one end, far away from the output copper sheet fixing screw, of the output copper sheet is connected with an output connecting column through a clamping groove, the output connecting column penetrates through the side wall of the cavity, and an output connector formed in the cavity is arranged on the periphery of one end, penetrating through the side wall of the cavity, of the output connecting column.
By adopting the technical scheme, the output connector is connected with the output copper sheet through the output connecting column, so that an external part can be connected with the output copper sheet through the output connector.
Furthermore, the cover plate is connected with the cavity through the cover plate fixing screw, the capacitor flying rod supporting piece is formed on one side of the middle of the cavity, and the upper end of the capacitor flying rod supporting piece is connected with the capacitor flying rod through a clamping groove.
Through adopting above-mentioned technical scheme, apron set screw can with the cavity is convenient split of carrying on, like this the apron can be convenient follow pull down on the cavity, the boss height of electric capacity fly rod support piece side can change the capacitance value by a wide margin, simultaneously through the adjustment the length of electric capacity fly rod can also obtain another resonance point thereby obtain two forms of making a zero point through a capacitor structure.
Furthermore, the capacitor flying rod fixing screw penetrates through the capacitor flying rod and is in threaded connection with the capacitor flying rod supporting piece, and the capacitor flying rod fixing screw clamps and fixes the capacitor flying rod in a clamping groove in the upper end of the capacitor flying rod supporting piece.
Through adopting above-mentioned technical scheme, electric capacity fly pole set screw can with electric capacity fly pole support piece carries out the split, like this electric capacity fly pole can be convenient follow pull down on the electric capacity fly pole support piece.
Furthermore, the capacitance flying rod fixing screw is made of PEEK materials, and the tuning screw penetrates through the cover plate and is in threaded connection with the cavity.
Through adopting above-mentioned technical scheme, adopt PEEK material to make electric capacity fly rod set screw is non-metallic material, can not exert an influence to the resonance.
Furthermore, the input connecting column is made of copper materials, and one end of the input connecting column, which is far away from the input copper sheet, is spliced with the inner wall of the input connector.
By adopting the technical scheme, the input connecting column made of the copper material has good conductivity.
Furthermore, the output connecting column is made of copper materials, and one end of the output connecting column, which is far away from the output copper sheet, is connected with the inner wall of the output connector in an inserting mode.
By adopting the technical scheme, the output connecting column made of the copper material has good conductivity.
The specific working principle is as follows: the input joint is connected with the input equipment, the input equipment can be connected with the input copper sheet through the input joint and the input connecting column, the output joint is connected with the output equipment, the output equipment can be connected with the output copper sheet through the output joint and the output connecting column, an open window zero point structure is used between the two resonant cavities where the input copper sheet and the output copper sheet are located, coupling between the two resonant cavities can be amplified in actual use, the width required by a window is reduced, the cavity can be processed more easily and is easy to control, the capacitance value can be changed greatly by adjusting the height of a boss on the side surface of the capacitance fly rod supporting piece, meanwhile, the other resonant point can be obtained by adjusting the length of the capacitance fly rod, so that two zero point forms can be obtained through one capacitance structure, and the height of the boss on the side surface of the capacitance fly rod supporting piece, therefore, the three resonant cavities are not blocked at the junctions of the three resonant cavities in the cavity, windows among the three resonant cavities in the cavity are all opened, coupling can be enhanced, the windows among the three resonant cavities are all opened to enhance coupling, the defect that the windows need to be opened to the maximum due to strong coupling among the windows, two resonators need to be connected to achieve strong coupling is overcome, and the processing difficulty of equipment is reduced.
The invention has the beneficial effects that:
in order to solve the problems that the window needs to be opened to the maximum due to the stronger coupling ratio between the resonant cavity windows of the cavity used by the existing resonator, two resonators need to be connected to achieve strong coupling, the processing difficulty of the cavity is larger, and the coupling amplification is difficult to control, the invention opens all the windows between the three resonant cavities in the cavity to enhance the coupling by setting the open cavity, and uses the structure of two points of the open window, so that the coupling between the two resonant cavities can be amplified in the actual process, and the required window width can be reduced, thereby enabling the processing mode of the cavity to be simpler and more convenient, enabling the coupling amplification to be easier to realize and easy to control, and being very practical; and the structure of the capacitance flying rod support piece enables the height of the boss on the side surface of the capacitance flying rod support piece to be greatly changed in capacitance value, and meanwhile, the length of the capacitance flying rod is adjusted to obtain another resonance point, so that two zero point forms are obtained through one capacitance structure, and the structure of the cavity is further simplified.
Drawings
Fig. 1 is a schematic structural diagram of an open zero of a filter, a duplexer, and a combiner according to the present invention;
fig. 2 is a schematic structural diagram of the filter, the duplexer, and the combiner after the cover plate is removed from the open zero point;
fig. 3 is a schematic structural diagram of the cover plate in the open zero point of the filter, duplexer and combiner according to the present invention;
figure 4 is a top cross-sectional view of an open zero of a filter, duplexer, combiner in accordance with the present invention;
fig. 5 is a top view of the filter, duplexer, and combiner with the cover plate removed from the open zero according to the present invention;
fig. 6 is a side view of an open zero of a filter, duplexer, combiner of the present invention.
The reference numerals are explained below:
1. a cavity; 2. a cover plate; 3. a capacitive fly rod; 4. a capacitive fly bar support; 5. a capacitor flying rod fixing screw; 6. inputting a copper sheet fixing screw; 7. inputting a copper sheet; 8. an input connector; 9. an output copper sheet fixing screw; 10. outputting the copper sheet; 11. an output connector; 12. a cover plate fixing screw; 13. a tuning screw; 14. an input connecting column; 15. an output connecting column.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1-6, the open zero of the filter, the duplexer and the combiner comprises a cavity 1, a capacitance flying rod 3 and an input copper sheet 7, a cover plate 2 is arranged at the upper end of the cavity 1, a cover plate fixing screw 12 is arranged on the cover plate 2, the cover plate fixing screw 12 penetrates through the cover plate 2 to be connected with the cavity 1 through threads, one side of the middle part in the cavity 1 is provided with a capacitance flying rod supporting piece 4, the upper end of the capacitor flying rod support 4 is provided with the capacitor flying rod 3, the middle part of the upper end of the capacitor flying rod 3 is provided with a capacitor flying rod fixing screw 5, the input copper sheet 7 is arranged on one side of the capacitance flying rod 3, the output copper sheet 10 is arranged on one side of the capacitance flying rod 3 far away from the input copper sheet 7, and tuning screws 13 are arranged on the other side of the capacitance flying rod 3, and the number of the tuning screws 13 is two.
As shown in fig. 2 to 5, an input copper sheet fixing screw 6 is arranged at the upper end of the input copper sheet 7, the input copper sheet fixing screw 6 penetrates through the input copper sheet 7 to be connected with the cavity 1 through a thread, the input copper sheet 7 is connected with the cavity 1 through the input copper sheet fixing screw 6, the input copper sheet 7 is fixed on the cavity 1 through the input copper sheet fixing screw 6, and the input copper sheet fixing screw 6 can be conveniently screwed off from the cavity 1, so that the input copper sheet 7 can be conveniently detached from the cavity 1.
As shown in fig. 2 to 6, one end of the input copper sheet 7, which is far away from the input copper sheet fixing screw 6, is connected with an input connection post 14 through a clamping groove, the input connection post 14 penetrates through the side wall of the cavity 1, an input connector 8 formed in the cavity 1 is arranged on the periphery of one end of the input connection post 14, which penetrates through the side wall of the cavity 1, and the input connector 8 is connected with the input copper sheet 7 through the input connection post 14, so that external components can be connected with the input copper sheet 7 through the input connector 8, which is very convenient.
As shown in fig. 2 to 5, an output copper sheet fixing screw 9 is arranged at the upper end of the output copper sheet 10, the output copper sheet fixing screw 9 penetrates through the output copper sheet 10 to be connected with the cavity 1 through a thread, the output copper sheet 10 is connected with the cavity 1 through the output copper sheet fixing screw 9, the output copper sheet 10 is fixed on the cavity 1 through the output copper sheet fixing screw 9, and the output copper sheet fixing screw 9 can be conveniently screwed off from the cavity 1, so that the output copper sheet 10 can be conveniently detached from the cavity 1.
As shown in fig. 2 to 6, one end of the output copper sheet 10, which is far away from the output copper sheet fixing screw 9, is connected with an output connection post 15 through a clamping groove, the output connection post 15 penetrates through the side wall of the cavity 1, an output connector 11 formed in the cavity 1 is arranged on the periphery of one end of the output connection post 15, which penetrates through the side wall of the cavity 1, and the output connector 11 is connected with the output copper sheet 10 through the output connection post 15, so that external components can be connected with the output copper sheet 10 through the output connector 11, which is very convenient.
As shown in fig. 1-5, the cover plate 2 is connected to the cavity 1 by the cover plate fixing screw 12, the capacitance flying bar supporting member 4 is formed at one side of the middle of the cavity 1, the upper end of the capacitance flying bar supporting member 4 is connected to the capacitance flying bar 3 by a clamping groove, the cover plate fixing screw 12 can be conveniently detached from the cavity 1, so that the cover plate 2 can be conveniently detached from the cavity 1, the height of the boss at the side of the capacitance flying bar supporting member 4 can greatly change the capacitance value, and at the same time, another resonance point can be obtained by adjusting the length of the capacitance flying bar 3 to obtain two zero point forms by using one capacitance structure, the height of the boss at the side of the capacitance flying bar supporting member 4 is low, so that the height of the boss at the side of the capacitance flying bar supporting member 4 can not block three resonant cavities at the junction of the three resonant cavities in the, thus, the windows between the three resonant cavities in the cavity 1 are all opened, and the coupling can be enhanced.
As shown in fig. 2 to 5, the capacitor flying bar fixing screw 5 penetrates through the capacitor flying bar 3 and is in threaded connection with the capacitor flying bar support 4, the capacitor flying bar fixing screw 5 clamps and fixes the capacitor flying bar 3 in a clamping groove at the upper end of the capacitor flying bar support 4, the capacitor flying bar fixing screw 5 can be detached from the capacitor flying bar support 4, so that the capacitor flying bar 3 can be conveniently detached from the capacitor flying bar support 4, and the clamping groove at the upper end of the capacitor flying bar 3 fixing piece has a positioning effect on the capacitor flying bar 3.
As shown in fig. 1 to 5, the capacitance flying bar fixing screw 5 is made of PEEK material, the tuning screw 13 penetrates through the cover plate 2 and is connected with the cavity 1 through threads, the capacitance flying bar fixing screw 5 made of PEEK material is made of non-metal material, which does not affect resonance, and tuning operation can be performed through the tuning screw 13.
As shown in fig. 4-6, the input connection column 14 is made of a copper material, one end of the input connection column 14, which is far away from the input copper sheet 7, is inserted into the inner wall of the input connector 8, and the input connection column 14 made of the copper material has good electrical conductivity, which is beneficial to conducting electricity from the connection part of the input connector 8 to the input copper sheet 7.
As shown in fig. 4-6, the output connection column 15 is made of a copper material, one end of the output connection column 15, which is far away from the output copper sheet 10, is inserted into the inner wall of the output connector 11, and the output connection column 15 made of the copper material has good electrical conductivity, which is beneficial to conducting electricity from the connection part of the output connector 11 to the output copper sheet 10.
The specific working principle is as follows: the input connector 8 is connected with an input device, the input device can be connected with the input copper sheet 7 through the input connector 8 and the input connecting column 14, the output connector 11 is connected with an output device, the output device can be connected with the output copper sheet 10 through the output connector 11 and the output connecting column 15, an open window zero point structure is used between the two resonant cavities where the input copper sheet 7 and the output copper sheet 10 are located, coupling between the two resonant cavities can be amplified in practical use, the required width of a window is reduced, the cavity 1 is easier to process and easy to control, the height of a boss on the side surface of the capacitance fly rod support 4 can greatly change a capacitance value, and meanwhile, another resonance point can be obtained by adjusting the length of the capacitance fly rod 3 so as to obtain two zero point forms through one capacitance structure, the height of the boss on the side surface of the capacitance flying rod supporting piece 4 is low, so that the boss can not block three resonant cavities at the junction of the three resonant cavities in the cavity 1, windows among the three resonant cavities in the cavity 1 are all opened, coupling can be enhanced, the windows among the three resonant cavities are all opened to enhance coupling, the defect that the windows need to be opened to the maximum due to the fact that coupling among the windows is strong, two resonators need to be connected to achieve strong coupling is overcome, and the processing difficulty of equipment is reduced.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (10)
1. Open zero of wave filter, duplexer, combiner, its characterized in that: the capacitor flying bar comprises a cavity (1), a capacitor flying bar (3) and an input copper sheet (7), wherein a cover plate (2) is arranged at the upper end of the cavity (1), a cover plate fixing screw (12) is arranged on the cover plate (2), the cover plate fixing screw (12) penetrates through the cover plate (2) and is in threaded connection with the cavity (1), a capacitor flying bar supporting piece (4) is arranged on one side of the middle in the cavity (1), the capacitor flying bar (3) is arranged at the upper end of the capacitor flying bar supporting piece (4), a capacitor flying bar fixing screw (5) is arranged in the middle of the upper end of the capacitor flying bar (3), the input copper sheet (7) is arranged on one side of the capacitor flying bar (3), an output copper sheet (10) is arranged on one side of the input copper sheet (7) away from the capacitor flying bar (3), and a tuning screw (13), the number of the tuning screws (13) is two.
2. The open zero for a filter, duplexer, combiner, according to claim 1, wherein: an input copper sheet fixing screw (6) is arranged at the upper end of the input copper sheet (7), the input copper sheet fixing screw (6) penetrates through the input copper sheet (7) to be connected with the cavity (1) through threads, and the input copper sheet (7) is connected with the cavity (1) through the input copper sheet fixing screw (6).
3. The open zero for a filter, duplexer, combiner, according to claim 2, wherein: an input connecting column (14) is connected to one end, far away from the input copper sheet fixing screw (6), of the input copper sheet (7) through a clamping groove, the input connecting column (14) penetrates through the side wall of the cavity (1), and an input joint (8) formed in the cavity (1) is arranged on the periphery of one end, penetrating through the side wall of the cavity (1), of the input connecting column (14).
4. The open zero for a filter, duplexer, combiner, according to claim 1, wherein: an output copper sheet fixing screw (9) is arranged at the upper end of the output copper sheet (10), the output copper sheet fixing screw (9) penetrates through the output copper sheet (10) to be connected with the cavity (1) through threads, and the output copper sheet (10) is connected with the cavity (1) through the output copper sheet fixing screw (9).
5. The open zero for a filter, duplexer, combiner, according to claim 4, wherein: the output copper sheet (10) is far away from one end of the output copper sheet fixing screw (9) and is connected with an output connecting column (15) through a clamping groove, the output connecting column (15) penetrates through the side wall of the cavity (1), and an output joint (11) formed in the periphery of one end of the side wall of the cavity (1) is arranged on the periphery of the output connecting column (15).
6. The open zero for a filter, duplexer, combiner, according to claim 1, wherein: the capacitor flying rod structure is characterized in that the cover plate (2) is connected with the cavity (1) through the cover plate fixing screw (12), the capacitor flying rod support piece (4) is formed on one side of the middle of the cavity (1), and the upper end of the capacitor flying rod support piece (4) is connected with the capacitor flying rod (3) through a clamping groove.
7. The open zero for a filter, duplexer, combiner, according to claim 1, wherein: the capacitor flying rod fixing screw (5) penetrates through the capacitor flying rod (3) and the capacitor flying rod supporting piece (4) to be connected through threads, and the capacitor flying rod fixing screw (5) clamps and presses and fixes the capacitor flying rod (3) in a clamping groove in the upper end of the capacitor flying rod supporting piece (4).
8. The open zero for a filter, duplexer, combiner, according to claim 1, wherein: the capacitor flying rod fixing screw (5) is made of PEEK materials, and the tuning screw (13) penetrates through the cover plate (2) and the cavity (1) and is in threaded connection.
9. The open zero for a filter, duplexer, combiner, according to claim 3, wherein: the input connecting column (14) is made of copper materials, and one end, far away from the input copper sheet (7), of the input connecting column (14) is connected with the inner wall of the input connector (8) in an inserting mode.
10. The open zero for a filter, duplexer, combiner, according to claim 5, wherein: the output connecting column (15) is made of copper materials, and one end, far away from the output copper sheet (10), of the output connecting column (15) is connected with the inner wall of the output connector (11) in an inserting mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010637517.7A CN112002966A (en) | 2020-07-05 | 2020-07-05 | Open zero point of filter, duplexer and combiner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010637517.7A CN112002966A (en) | 2020-07-05 | 2020-07-05 | Open zero point of filter, duplexer and combiner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112002966A true CN112002966A (en) | 2020-11-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010637517.7A Pending CN112002966A (en) | 2020-07-05 | 2020-07-05 | Open zero point of filter, duplexer and combiner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112002966A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113285193A (en) * | 2021-04-20 | 2021-08-20 | 武汉德威斯电子技术有限公司 | Zero-point adjustable frequency hopping filter |
| CN114566776A (en) * | 2022-01-27 | 2022-05-31 | 恒尔威科技(苏州)有限公司 | Built-in broadband cavity duplexer of miniaturized base station antenna of high performance |
-
2020
- 2020-07-05 CN CN202010637517.7A patent/CN112002966A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113285193A (en) * | 2021-04-20 | 2021-08-20 | 武汉德威斯电子技术有限公司 | Zero-point adjustable frequency hopping filter |
| CN113285193B (en) * | 2021-04-20 | 2022-06-21 | 武汉德威斯电子技术有限公司 | Zero-point adjustable frequency hopping filter |
| CN114566776A (en) * | 2022-01-27 | 2022-05-31 | 恒尔威科技(苏州)有限公司 | Built-in broadband cavity duplexer of miniaturized base station antenna of high performance |
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