CN110444845B - Coaxial cavity duplexer - Google Patents
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- CN110444845B CN110444845B CN201910674490.6A CN201910674490A CN110444845B CN 110444845 B CN110444845 B CN 110444845B CN 201910674490 A CN201910674490 A CN 201910674490A CN 110444845 B CN110444845 B CN 110444845B
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- 239000002184 metal Substances 0.000 claims abstract description 113
- 230000008878 coupling Effects 0.000 claims abstract description 96
- 238000010168 coupling process Methods 0.000 claims abstract description 96
- 238000005859 coupling reaction Methods 0.000 claims abstract description 96
- 239000007787 solid Substances 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
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- 230000002457 bidirectional effect Effects 0.000 description 1
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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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/202—Coaxial 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
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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Abstract
The invention discloses a coaxial cavity duplexer, which comprises a metal cavity and an input/output port; the metal cavity is in a convex shape, four resonant cavities are distinguished, three parts protruding outwards are respectively one, the rest middle part is one, the resonant cavity of the middle part is a second-order coaxial resonant cavity, the resonant cavities at the left side, the right side and the back of the second-order coaxial resonant cavity are respectively a first-order coaxial resonant cavity, a right side and a back third-order coaxial resonant cavity, the first-order coaxial resonant cavity and the second-order coaxial resonant cavity are shared resonant cavities, the double-frequency characteristic is achieved, the right side and the back third-order coaxial resonant cavities are single-frequency resonant cavities, and the single-frequency band parts are taken out; the four resonant cavities are coupled through a coupling resonant window; three input/output ports are coaxial feeder lines and are all prolonged and inserted into the vertical metal cylinder of the first-order coaxial resonant cavity and the resonant rods of the right-side and back third-order coaxial resonant cavities. The invention has compact structure, miniaturization, easy tuning and good selectivity.
Description
Technical Field
The invention relates to the technical field of microwave communication, in particular to a coaxial cavity duplexer.
Background
Along with the rapid development of wireless communication technology, the design of a microwave system is more and more complex, the index requirement on a circuit is more and more, the function of the circuit is more and more, the size requirement of the circuit is smaller, and the design period is shorter and shorter. Today wireless communication systems require higher performance, smaller volume, lower loss microwave devices. Thus, in order to meet the requirements of a communication network using as few devices as possible, two filters may be integrated into one diplexer. The duplexer is a special bidirectional three-terminal filter, is a key device for the complete machine to complete the transceiving function, and has the functions of isolating the transmitting and receiving signals, coupling the weak receiving signals in, and feeding larger transmitting power to an antenna, so that the receiving and transmitting can work normally at the same time and are not interfered with each other. And can also be seen as two separate filters sharing one input. Compared with other filters and diplexers, the cavity filter and the diplexer have the advantages of high rejection, low transmission loss and the like, so that the cavity filter and the diplexer are widely applied to an outdoor transceiver. However, the conventional cavity duplexer generally adopts a parallel structure, which occupies a large area and is unfavorable for system integration, thus becoming one of the main bottlenecks for limiting the miniaturization of the system.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art (namely, the coaxial cavity duplexer has a side-by-side structure, is large in size and difficult to miniaturize, and is unfavorable for the integration of a system), and provides the coaxial cavity duplexer which has the advantages of simple and compact structure, miniaturization, easy tuning, wider bandwidth and good selectivity.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows: a coaxial cavity duplexer comprises a closed metal cavity and an input/output port; the whole appearance of the metal cavity is in a convex shape, four resonant cavities are divided, three parts protruding outwards are respectively one, the rest middle part is one, the resonant cavity in the middle part is a second-order coaxial resonant cavity, the resonant cavity at the left side of the second-order coaxial resonant cavity is a first-order coaxial resonant cavity, the resonant cavity at the right side of the second-order coaxial resonant cavity is a right-side third-order coaxial resonant cavity, the resonant cavity at the back of the second-order coaxial resonant cavity is a back third-order coaxial resonant cavity, the first-order coaxial resonant cavity and the second-order coaxial resonant cavity are shared resonant cavities, the two-frequency characteristic is achieved, the right-side third-order coaxial resonant cavity and the back third-order coaxial resonant cavity are single-frequency resonant cavities, and the respective single-frequency band parts are taken out; the four resonant cavities are coupled through three coupling resonant windows, and the four resonant cavities are respectively provided with a first coupling resonant window, a right second coupling resonant window and a back second coupling resonant window; the first-order coaxial resonant cavity is internally provided with a first vertical metal cylinder and a first horizontal metal cylinder, the first horizontal metal cylinder is positioned in the middle of the first-order coaxial resonant cavity, one end of the first horizontal metal cylinder is embedded in the middle of the first vertical metal cylinder, the other end of the first horizontal metal cylinder is fixed on the inner wall of the first-order coaxial resonant cavity and is a short-circuited end, the two ends of the first vertical metal cylinder are open-circuited, the distances between the two ends of the first vertical metal cylinder and the top and the bottom of the first-order coaxial resonant cavity are equal, the first resonant frequency generated by the first-order coaxial resonant cavity is controlled by the height of the first vertical metal cylinder and the length of the first horizontal metal cylinder together, the second resonant frequency is controlled by the height of the first vertical metal cylinder only, and further, the double-frequency characteristic of relatively independent control is obtained, and the second resonant frequency is far away from the higher resonant frequency, so that the stop band characteristic is good; the second-order coaxial resonant cavity is internally provided with a second vertical metal cylinder and a second horizontal metal cylinder, the second horizontal metal cylinder is positioned in the middle of the second-order coaxial resonant cavity, one end of the second horizontal metal cylinder is embedded in the middle of the second vertical metal cylinder, the other end of the second horizontal metal cylinder is fixed on the inner wall of the second-order coaxial resonant cavity and is a short-circuited end, two ends of the second vertical metal cylinder are open-circuited, the two ends of the second vertical metal cylinder are equal to the distance between the top and the bottom of the second-order coaxial resonant cavity, the first resonant frequency generated by the second-order coaxial resonant cavity is controlled by the height of the second vertical metal cylinder and the length of the second horizontal metal cylinder together, and the second resonant frequency is controlled by the height of the second vertical metal cylinder only, so that the double-frequency characteristic of relatively independent control is obtained; a first resonant rod is arranged in the right third-order coaxial resonant cavity, one end of the first resonant rod is directly fixed at the bottom of the right third-order coaxial resonant cavity, a short-circuit end is arranged, the other end of the first resonant rod is open-circuited, and the right third-order coaxial resonant cavity takes out a high-frequency part of the front two-order shared resonant cavity; a second resonant rod is arranged in the back third-order coaxial resonant cavity, one end of the second resonant rod is directly fixed at the bottom of the back third-order coaxial resonant cavity and is a short-circuit end, the other end of the second resonant rod is open, the height of the second resonant rod is higher than that of the first resonant rod, and the back third-order coaxial resonant cavity takes out the low-frequency part of the front two-order shared resonant cavity; the first coupling resonant window consists of a first coupling junction and a first coupling window, the first coupling junction is directly inserted into the first horizontal metal cylinder and the second horizontal metal cylinder, the position of the circle center of the first coupling junction is vertical to the straight line of the circle centers of the first horizontal metal cylinder and the second horizontal metal cylinder, the first coupling window is positioned on one side of the first vertical metal cylinder, and the first coupling junction and the first coupling window jointly control the coupling strength between the first-order coaxial resonant cavity and the second-order coaxial resonant cavity; the right second coupling resonance window consists of a second coupling junction and a second coupling window, the second coupling junction is directly inserted into the second vertical metal cylinder and the first resonance rod, the circle center of the second coupling junction is in the same line with the circle centers of the second vertical metal cylinder and the first resonance rod, the second coupling window is distributed on the cavity walls at two sides of the first resonance rod, and the second coupling junction and the second coupling window jointly control the coupling strength between the second-order coaxial resonance cavity and the right third-order coaxial resonance cavity; the back second coupling resonant window consists of a third coupling junction and a third coupling window, the third coupling junction is connected with the back of the second vertical metal cylinder and the second resonant rod, the circle center of the third coupling junction is in the same line with the circle centers of the second vertical metal cylinder and the second resonant rod, and the third coupling junction and the third coupling window jointly control the coupling strength between the second-order coaxial resonant cavity and the back third-order coaxial resonant cavity; the three input/output ports are respectively a first input/output port, a second input/output port and a third input/output port, and are coaxial feeder lines, and are respectively inserted into a first vertical metal cylinder of the first-order coaxial resonant cavity, a first resonant rod of the right third-order coaxial resonant cavity and a second resonant rod of the back third-order coaxial resonant cavity in an extending mode.
Further, the left side, the right side and the back of the metal cavity are respectively provided with an SMA port for installing three input and output ports.
Further, the first vertical metal cylinder, the second vertical metal cylinder, the first resonant rod and the second resonant rod are of a hollow structure or a solid structure.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. based on the traditional coaxial cavity diplexer arranged side by side, the front two-stage resonant cavities are shared, and the required frequency band is only taken out from the last-stage resonant cavity, so that miniaturization is realized.
2. The invention has better filter characteristic in the passband and good out-of-band frequency selection characteristic.
3. The invention has the advantages of simple and compact structure, easy design and easy processing.
Drawings
Fig. 1 is a schematic top view cross-sectional structure of a coaxial cavity duplexer according to the present invention.
Fig. 2 is a schematic diagram of the overall structure of the coaxial cavity duplexer proposed in the present invention.
Fig. 3 is a diagram of simulation results of an embodiment of the present invention.
Detailed Description
The invention will be further illustrated with reference to specific examples.
As shown in fig. 1 and fig. 2, the coaxial cavity duplexer provided in this embodiment includes a closed metal cavity 1 and three input/output ports, namely, a first input/output port 2, a second input/output port 15, and a third input/output port 16; the whole appearance of the metal cavity 1 is in a convex shape, four resonant cavities are divided, three parts protruding outwards are respectively one, the rest middle part is one, the resonant cavity in the middle part is a second-order coaxial resonant cavity, the resonant cavity at the left side of the second-order coaxial resonant cavity is a first-order coaxial resonant cavity, the resonant cavity at the right side of the second-order coaxial resonant cavity is a right-side third-order coaxial resonant cavity, the resonant cavity at the back of the second-order coaxial resonant cavity is a back third-order coaxial resonant cavity, the first-order coaxial resonant cavity and the second-order coaxial resonant cavity are shared resonant cavities, the two-frequency characteristics are realized, the right-side third-order coaxial resonant cavity and the back third-order coaxial resonant cavity are single-frequency resonant cavities, and the respective single-frequency band parts are taken out; the four resonant cavities are coupled through three coupling resonant windows, and the four resonant cavities are respectively provided with a first coupling resonant window, a right second coupling resonant window and a back second coupling resonant window.
The coaxial resonant cavity of first order is equipped with first vertical metal cylinder 3 and first horizontal metal cylinder 4 in the coaxial resonant cavity of first order, first horizontal metal cylinder 4 is located the intermediate position of the coaxial resonant cavity of first order, and its one end embedding is in the centre of first vertical metal cylinder 3, and the other end is fixed on the inner wall of the coaxial resonant cavity of first order, is the short-circuited end, the open circuit of first vertical metal cylinder 3 both ends, and its both ends are equal with the distance of the top and the bottom of the coaxial resonant cavity of first order, and the first resonant frequency that this structure produced is controlled jointly by the height of first vertical metal cylinder 3 and the length of first horizontal metal cylinder 4, and the second resonant frequency is controlled by the height of first vertical metal cylinder 3 alone, can obtain the dual-frenquency characteristic of relative independent control. And the structure has the further advantage that the higher resonant frequency is far away from the second resonant frequency, so that the stop band characteristic is better.
The first coupling resonance window consists of a first coupling junction 5 and a first coupling window 6, the first coupling junction 5 is directly inserted into the first horizontal metal cylinder 4 and the second horizontal metal cylinder 8, the position of the center of the circle is vertical to the straight line of the centers of the circles of the first horizontal metal cylinder 4 and the second horizontal metal cylinder 8, the first coupling window 6 is positioned on one side of the first vertical metal cylinder 3, and the first coupling junction 5 and the first coupling window 6 jointly control the coupling strength between the first-order coaxial resonance cavity and the second-order coaxial resonance cavity.
The second-order coaxial resonant cavity is internally provided with a second vertical metal cylinder 7 and a second horizontal metal cylinder 8, the placement modes of the second-order coaxial resonant cavity are consistent with those of the first vertical metal cylinder 3 and the first horizontal metal cylinder 4 in the first-order coaxial resonant cavity, and specifically: the second horizontal metal cylinder 8 is located in the middle of the second-order coaxial resonant cavity, one end of the second horizontal metal cylinder is embedded in the middle of the second vertical metal cylinder 7, the other end of the second horizontal metal cylinder is fixed on the inner wall of the second-order coaxial resonant cavity and is a short-circuited end, two ends of the second vertical metal cylinder 7 are open, the distances between the two ends of the second horizontal metal cylinder and the top and the bottom of the second-order coaxial resonant cavity are equal, the generated first resonant frequency is controlled jointly by the height of the second vertical metal cylinder 7 and the length of the second horizontal metal cylinder 8, and the second resonant frequency is controlled only by the height of the second vertical metal cylinder 7, so that the double-frequency characteristic of relatively independent control can be obtained.
The second coupling resonance window on the right side is composed of a second coupling junction 9 and a second coupling window 10, and the placement mode of the second coupling resonance window is slightly different from that of the first coupling junction 5 and the second coupling window 6 in the first coupling resonance window, specifically: the second coupling junction 9 is directly inserted into the second vertical metal cylinder 7 and the first resonant rod 11, the circle center of the second coupling junction is in the same line with the circle centers of the second vertical metal cylinder 7 and the first resonant rod 11, the second coupling windows 10 are distributed on the cavity walls at two sides of the first resonant rod 11, and the second coupling junction 9 and the second coupling windows 10 jointly control the coupling strength between the second-order coaxial resonant cavity and the right-side third-order coaxial resonant cavity.
The first resonant rod 11 is arranged in the right third-order coaxial resonant cavity, one end of the first resonant rod 11 is directly fixed at the bottom of the right third-order coaxial resonant cavity, is a short-circuited end, and the other end of the first resonant rod is open-circuited, and the height of the first resonant rod is smaller than that of the second resonant rod 14 in the back third-order coaxial resonant cavity, so that the right third-order coaxial resonant cavity takes out the high-frequency part of the front two-order common resonant cavity.
The back second coupling resonator window is composed of a third coupling junction 12 and a third coupling window 13, and the placement mode is similar to that of the right second coupling resonator window. The difference is that the third coupling 12 connects the back of the second vertical metal cylinder 7 and the second resonant rod 14, the center of the third coupling is on the same straight line with the center of the second vertical metal cylinder 7 and the center of the second resonant rod 14, and the third coupling 12 and the third coupling window 13 jointly control the coupling strength between the second-order coaxial resonant cavity and the back third-order coaxial resonant cavity.
The second resonant rod 14 is disposed in the third-order coaxial resonant cavity on the back, one end of the second resonant rod 14 is directly fixed at the bottom of the third-order coaxial resonant cavity on the back, and is a short-circuited end, the other end of the second resonant rod is open-circuited, and the height of the second resonant rod 14 is higher than that of the first resonant rod 11, so that the third-order coaxial resonant cavity on the back takes out the low-frequency part of the first two-order shared resonant cavity.
The vertical metal cylinder in the first-order coaxial resonant cavity and the second-order coaxial resonant cavity, the vertical metal cylinder in the right-side third-order coaxial resonant cavity and the resonant rod in the back third-order coaxial resonant cavity can be hollow or solid.
The left side, the right side and the back of the metal cavity 1 are respectively provided with an SMA port for installing three input/output ports, wherein the three input/output ports (a first input/output port 2, a second input/output port 15 and a third input/output port 16) are coaxial feeder lines, and the characteristic impedance of the three input/output ports is 50 omega respectively prolonged and inserted into a first vertical metal cylinder 3 of a first-order coaxial resonant cavity, a first resonant rod 11 of a right-side third-order coaxial resonant cavity and a second resonant rod 14 of a back third-order coaxial resonant cavity.
The center frequency of the designed coaxial cavity duplexer is 1000MHz and 1800MHz. The coaxial double-frequency filter is simulated and optimized by using three-dimensional simulation software HFSS, and the optimized main structural parameters are as follows:
L 4 ＝19mm,L 8 ＝24mm,L 6 ＝5mm,L 10 ＝10.4mm,L 13 ＝8.5mm,H 3 ＝61mm,H 7 ＝58mm,H 11 ＝38.5mm,H 14 ＝71mm。
as shown in fig. 3, scattering simulation results of the coaxial cavity duplexer of the embodiment are shown. The horizontal axis represents input signal frequency, ranging from 0.5GHz to 3.0GHz, and the vertical axis represents amplitude, including return loss S 11 Amplitude and insertion loss S of (2) 21 And S is 31 Is a function of the amplitude of (a). The center working frequency of the duplexer is 1000MHz and 1800MHz, the 3dB relative bandwidths are 14.47% and 7.6%, the insertion loss is 0.059dB and 0.0515dB respectively, and the return loss is reduced to below 15 dB. The coaxial cavity duplexer has the advantages of wide bandwidth, good performance, high isolation and the like.
In summary, compared with the traditional coaxial duplexer, the coaxial cavity duplexer provided by the invention shares the first two-stage resonant cavities, and the high-frequency and low-frequency bands are respectively taken out from the third-stage resonant cavities on the right side and the back, so that the miniaturization can be realized. In a word, the invention has the advantages of compact and simple structure, small volume, low loss of double-frequency band passband, good selectivity and the like, has practical popularization value and is worthy of popularization.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, so variations in shape and principles of the present invention should be covered.
Claims (3)
1. The utility model provides a coaxial cavity duplexer which characterized in that: comprises a closed metal cavity and an input/output port; the whole appearance of the metal cavity is in a convex shape, four resonant cavities are divided, three parts protruding outwards are respectively one, the rest middle part is one, the resonant cavity in the middle part is a second-order coaxial resonant cavity, the resonant cavity at the left side of the second-order coaxial resonant cavity is a first-order coaxial resonant cavity, the resonant cavity at the right side of the second-order coaxial resonant cavity is a right-side third-order coaxial resonant cavity, the resonant cavity at the back of the second-order coaxial resonant cavity is a back third-order coaxial resonant cavity, the first-order coaxial resonant cavity and the second-order coaxial resonant cavity are shared resonant cavities, the two-frequency characteristic is achieved, the right-side third-order coaxial resonant cavity and the back third-order coaxial resonant cavity are single-frequency resonant cavities, and the respective single-frequency band parts are taken out; the four resonant cavities are coupled through three coupling resonant windows, and the four resonant cavities are respectively provided with a first coupling resonant window, a right second coupling resonant window and a back second coupling resonant window; the first-order coaxial resonant cavity is internally provided with a first vertical metal cylinder and a first horizontal metal cylinder, the first horizontal metal cylinder is positioned in the middle of the first-order coaxial resonant cavity, one end of the first horizontal metal cylinder is embedded in the middle of the first vertical metal cylinder, the other end of the first horizontal metal cylinder is fixed on the inner wall of the first-order coaxial resonant cavity and is a short-circuited end, the two ends of the first vertical metal cylinder are open-circuited, the distances between the two ends of the first vertical metal cylinder and the top and the bottom of the first-order coaxial resonant cavity are equal, the first resonant frequency generated by the first-order coaxial resonant cavity is controlled by the height of the first vertical metal cylinder and the length of the first horizontal metal cylinder together, the second resonant frequency is controlled by the height of the first vertical metal cylinder only, and further, the double-frequency characteristic of relatively independent control is obtained, and the second resonant frequency is far away from the higher resonant frequency, so that the stop band characteristic is good; the second-order coaxial resonant cavity is internally provided with a second vertical metal cylinder and a second horizontal metal cylinder, the second horizontal metal cylinder is positioned in the middle of the second-order coaxial resonant cavity, one end of the second horizontal metal cylinder is embedded in the middle of the second vertical metal cylinder, the other end of the second horizontal metal cylinder is fixed on the inner wall of the second-order coaxial resonant cavity and is a short-circuited end, two ends of the second vertical metal cylinder are open-circuited, the two ends of the second vertical metal cylinder are equal to the distance between the top and the bottom of the second-order coaxial resonant cavity, the first resonant frequency generated by the second-order coaxial resonant cavity is controlled by the height of the second vertical metal cylinder and the length of the second horizontal metal cylinder together, and the second resonant frequency is controlled by the height of the second vertical metal cylinder only, so that the double-frequency characteristic of relatively independent control is obtained; a first resonant rod is arranged in the right third-order coaxial resonant cavity, one end of the first resonant rod is directly fixed at the bottom of the right third-order coaxial resonant cavity, a short-circuit end is arranged, the other end of the first resonant rod is open-circuited, and the right third-order coaxial resonant cavity takes out a high-frequency part of the front two-order shared resonant cavity; a second resonant rod is arranged in the back third-order coaxial resonant cavity, one end of the second resonant rod is directly fixed at the bottom of the back third-order coaxial resonant cavity and is a short-circuit end, the other end of the second resonant rod is open, the height of the second resonant rod is higher than that of the first resonant rod, and the back third-order coaxial resonant cavity takes out the low-frequency part of the front two-order shared resonant cavity; the first coupling resonant window consists of a first coupling junction and a first coupling window, the first coupling junction is directly inserted into the first horizontal metal cylinder and the second horizontal metal cylinder, the position of the circle center of the first coupling junction is vertical to the straight line of the circle centers of the first horizontal metal cylinder and the second horizontal metal cylinder, the first coupling window is positioned on one side of the first vertical metal cylinder, and the first coupling junction and the first coupling window jointly control the coupling strength between the first-order coaxial resonant cavity and the second-order coaxial resonant cavity; the right second coupling resonance window consists of a second coupling junction and a second coupling window, the second coupling junction is directly inserted into the second vertical metal cylinder and the first resonance rod, the circle center of the second coupling junction is in the same line with the circle centers of the second vertical metal cylinder and the first resonance rod, the second coupling window is distributed on the cavity walls at two sides of the first resonance rod, and the second coupling junction and the second coupling window jointly control the coupling strength between the second-order coaxial resonance cavity and the right third-order coaxial resonance cavity; the back second coupling resonant window consists of a third coupling junction and a third coupling window, the third coupling junction is connected with the back of the second vertical metal cylinder and the second resonant rod, the circle center of the third coupling junction is in the same line with the circle centers of the second vertical metal cylinder and the second resonant rod, and the third coupling junction and the third coupling window jointly control the coupling strength between the second-order coaxial resonant cavity and the back third-order coaxial resonant cavity; the three input/output ports are respectively a first input/output port, a second input/output port and a third input/output port, and are coaxial feed lines, and are respectively inserted into a first vertical metal cylinder of a first-order coaxial resonant cavity, a first resonant rod of a right third-order coaxial resonant cavity and a second resonant rod of a back third-order coaxial resonant cavity in an extending manner; the center operating frequencies of the diplexer are 1000MHZ and 1800MHZ.
2. The coaxial cavity diplexer of claim 1, wherein: and the left side, the right side and the back of the metal cavity are respectively provided with an SMA port for installing three input and output ports.
3. The coaxial cavity diplexer of claim 1, wherein: the first vertical metal cylinder, the second vertical metal cylinder, the first resonant rod and the second resonant rod are of hollow structures or solid structures.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2065967A1 (en) * | 2007-11-30 | 2009-06-03 | Alcatel Lucent | Bandpass filter |
| CN103138034A (en) * | 2013-02-28 | 2013-06-05 | 上海大学 | Double frequency band filter of SIR coaxial cavity |
| EP2814112A1 (en) * | 2013-06-13 | 2014-12-17 | Alcatel Lucent | Resonant assembly |
| CN210430050U (en) * | 2019-07-25 | 2020-04-28 | 华南理工大学 | Coaxial cavity duplexer |
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- 2019-07-25 CN CN201910674490.6A patent/CN110444845B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2065967A1 (en) * | 2007-11-30 | 2009-06-03 | Alcatel Lucent | Bandpass filter |
| CN103138034A (en) * | 2013-02-28 | 2013-06-05 | 上海大学 | Double frequency band filter of SIR coaxial cavity |
| EP2814112A1 (en) * | 2013-06-13 | 2014-12-17 | Alcatel Lucent | Resonant assembly |
| CN210430050U (en) * | 2019-07-25 | 2020-04-28 | 华南理工大学 | Coaxial cavity duplexer |
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