CN210430050U - Coaxial cavity duplexer - Google Patents
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- CN210430050U CN210430050U CN201921176212.XU CN201921176212U CN210430050U CN 210430050 U CN210430050 U CN 210430050U CN 201921176212 U CN201921176212 U CN 201921176212U CN 210430050 U CN210430050 U CN 210430050U
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Abstract
The utility model 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 in the middle part is a second-order coaxial resonant cavity, the resonant cavities on 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 third-order coaxial resonant cavity 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 and have double-frequency characteristics, the right-side third-order coaxial resonant cavity and the back third-order coaxial resonant cavity are single-frequency resonant cavities, and respective; the four resonant cavities are coupled through a coupling resonant window; the three input and output ports are coaxial feeder lines and are respectively inserted into the vertical metal cylinder of the first-order coaxial resonant cavity and the resonant rods of the third-order coaxial resonant cavity on the right side and the back in an extending manner. The utility model discloses compact structure, can miniaturize, easily tune, selectivity good.
Description
Technical Field
The utility model belongs to the technical field of microwave communication's technique and specifically relates to indicate a coaxial cavity duplexer.
Background
With the rapid development of wireless communication technology, the design of a microwave system is more and more complex, the requirement on the indexes of a circuit is higher and higher, the functions of the circuit are more and more, the size requirement of the circuit is smaller and smaller, and the design cycle is shorter and shorter. Wireless communication systems today require higher performance, smaller volume, lower loss microwave devices. Therefore, in order to meet the requirements of the communication network with as few devices as possible, two filters may be integrated into one duplexer. The duplexer is a special bidirectional three-terminal filter, is a key device for the whole machine to complete the transceiving function, and has the functions of isolating the transmitting signal from the receiving signal, coupling the weak receiving signal in and feeding the larger transmitting power to the antenna, so as to ensure that the receiving and the transmitting can work normally at the same time without mutual interference. It can also be seen as two separate filters sharing one input. Compared with other filters and duplexers, the cavity filter and the duplexer have the advantages of high rejection, low transmission loss and the like, so that the cavity filter and the duplexer are widely applied to an outdoor transceiver. However, the traditional cavity duplexer generally adopts a parallel structure, has a large occupied area, is not beneficial to system integration, and becomes one of the main bottlenecks limiting the miniaturization of the system.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome prior art's shortcoming and not enough (coaxial cavity duplexer is the structure side by side promptly, and is bulky, is difficult to the miniaturization, is unfavorable for the integration of system), provide a simple structure compactness, can miniaturize, easily tune, bandwidth broad, the good coaxial cavity duplexer of selectivity.
In order to achieve the above object, the present invention provides a technical solution: a coaxial cavity duplexer comprises a closed metal cavity and an input/output port; the whole shape of the metal cavity is in a shape of a Chinese character 'tu', four resonant cavities are divided, three parts protruding outwards are respectively one, and the rest middle part is one, wherein the resonant cavity in the middle part is a second-order coaxial resonant cavity, the resonant cavity positioned on the left side of the second-order coaxial resonant cavity is a first-order coaxial resonant cavity, the resonant cavity positioned on the right side of the second-order coaxial resonant cavity is a right third-order coaxial resonant cavity, the resonant cavity positioned on 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 and have double-frequency characteristics, the right third-order coaxial resonant cavity and the back third-order coaxial resonant cavity are single-frequency resonant cavities, and respective single-; 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 second coupling resonant window on the right side and a second coupling resonant window on the back; a first vertical metal cylinder and a first horizontal metal cylinder are arranged in the first-order coaxial resonant cavity, 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-circuit end, 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, a 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, a second resonant frequency is controlled only by the height of the first vertical metal cylinder, and then a relatively independently controlled double-frequency characteristic is obtained, and the second resonant frequency is; a second vertical metal cylinder and a second horizontal metal cylinder are arranged in the second-order coaxial resonant cavity, the second horizontal metal cylinder 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, 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-circuit end, two ends of the second vertical metal cylinder are open-circuited, the distances between the two ends of the second vertical metal cylinder and the top and the bottom of the second-order coaxial resonant cavity are equal, a 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 a second resonant frequency is controlled only by the height of the second vertical metal cylinder, so; 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 and is a short-circuit end, 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 first two-order common 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-circuit, 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 first two-order common 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 perpendicular to the straight line where the circle centers of the first horizontal metal cylinder and the second horizontal metal cylinder are located, the first coupling window is located 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 resonant 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 resonant rod, the circle center of the second coupling junction and the circle center of the second vertical metal cylinder and the circle center of the first resonant rod are on the same straight line, the second coupling window is distributed on the cavity wall at two sides of the first resonant rod, and the second coupling junction and the second coupling window jointly control the coupling strength between the second-order coaxial resonant cavity and the right third-order coaxial resonant 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 and the circle center of the second vertical metal cylinder and the second resonant rod are on the same straight line, 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 and output ports are respectively a first input and output port, a second input and output port and a third input and output port, are coaxial feeder lines and are respectively and extendedly inserted into a first vertical metal cylinder of the 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.
Furthermore, the left side, the right side and the back of the metal cavity are respectively provided with an SMA port for mounting three input and output ports.
Further, the first vertical metal cylinder, the second vertical metal cylinder, the first resonance rod and the second resonance rod are of a hollow structure or a solid structure.
Compared with the prior art, the utility model, have following advantage and beneficial effect:
1. on the basis of the traditional coaxial cavity duplexer arranged side by side, the front two-order resonant cavity is shared, and the required frequency band is only taken out from the last-order resonant cavity, so that the miniaturization is realized.
2. The utility model discloses have better in-band filtering characteristic, the outband frequency selective characteristic is good.
3. The utility model has the advantages of simple and compact structure, easy design and easy processing.
Drawings
Fig. 1 is a schematic top view cross-sectional structure diagram of a coaxial cavity duplexer provided by the present invention.
Fig. 2 is an overall structure schematic diagram of the coaxial cavity duplexer provided by the present invention.
Fig. 3 is a simulation result diagram of the embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
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, which are a first input/output port 2, a second input/output port 15, and a third input/output port 16; the whole shape of the metal cavity 1 is in a shape of a Chinese character 'tu', four resonant cavities are divided, three parts protruding outwards are respectively one, and the rest middle part is one, wherein the resonant cavity in the middle part is a second-order coaxial resonant cavity, the resonant cavity positioned on the left side of the second-order coaxial resonant cavity is a first-order coaxial resonant cavity, the resonant cavity positioned on the right side of the second-order coaxial resonant cavity is a right third-order coaxial resonant cavity, the resonant cavity positioned on 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 dual-frequency characteristic is achieved, the right third-order coaxial resonant cavity and the back third-order coaxial resonant cavity are single-frequency resonant cavities, and respective; 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 second coupling resonant window on the right side and a second coupling resonant window on the back.
The first-order coaxial resonant cavity is internally provided with a first vertical metal cylinder 3 and a first horizontal metal cylinder 4, the first horizontal metal cylinder 4 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 3, 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-circuit end, two ends of the first vertical metal cylinder 3 are open-circuited, the distance between the two ends of the first vertical metal cylinder 3 and the distance between the two ends of the first horizontal metal cylinder 4 are equal to each other, the first resonant frequency generated by the structure is controlled by the height of the first vertical metal cylinder 3 and the length of the first horizontal metal cylinder 4 together, the second resonant frequency is. And the structure has the other advantage that the higher-order resonant frequency is far away from the second resonant frequency, so the stop band characteristic is better.
The first coupling resonant window is composed 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 circle center of the first coupling junction is perpendicular to the straight line where the circle centers of the first horizontal metal cylinder 4 and the second horizontal metal cylinder 8 are located, the first coupling window 6 is located 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 resonant cavity and the second-order coaxial resonant cavity.
A second vertical metal cylinder 7 and a second horizontal metal cylinder 8 are arranged in the second-order coaxial resonant cavity, and the placing mode of the second vertical metal cylinder is consistent with that of the first vertical metal cylinder 3 and that of the first horizontal metal cylinder 4 in the first-order coaxial resonant cavity, 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 into 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-circuit end, two ends of the second vertical metal cylinder 7 are open-circuited, distances between the two ends of the second vertical metal cylinder 7 and the top and the bottom of the second-order coaxial resonant cavity are equal, similarly, a generated first resonant frequency is controlled by the height of the second vertical metal cylinder 7 and the length of the second horizontal metal cylinder 8 together, a second resonant frequency is controlled only by the height of the second vertical metal cylinder 7, and a relatively independently controlled double-frequency characteristic can be obtained.
The right second coupling resonant window is composed of a second coupling junction 9 and a second coupling window 10, and the placement mode of the right second coupling resonant window is slightly different from the placement mode of the first coupling junction 5 and the second coupling window 6 in the first coupling resonant 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 and the circle centers of the second vertical metal cylinder 7 and the first resonant rod 11 are on the same straight line, the second coupling windows 10 are distributed on the cavity walls on the 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 third-order coaxial resonant cavity.
A 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 and is a short-circuit end, the other end of the first resonant rod is open-circuit, and the height of the first resonant rod is smaller than that of a second resonant rod 14 in the back third-order coaxial resonant cavity, so that the right third-order coaxial resonant cavity takes out a high-frequency part of the first 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, which are placed in a similar manner as the right second coupling resonator window. The difference is that the third coupling junction 12 is connected to the back of the second vertical metal cylinder 7 and the second resonant rod 14, the center of the third coupling junction is on the same line with the center of the second vertical metal cylinder 7 and the center of the second resonant rod 14, and the third coupling junction 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.
A second resonant rod 14 is arranged in the back third-order coaxial resonant cavity, one end of the second resonant rod 14 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-circuit, the height of the second resonant rod 14 is higher than that of the first resonant rod 11, and therefore the back third-order coaxial resonant cavity takes out the low-frequency part of the first two-order common resonant cavity.
The vertical metal cylinder in the first-order and second-order coaxial resonant cavities and the resonant rod in the right third-order and back third-order coaxial resonant cavities 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 mounting three input and output ports, the three input and output ports (a first input and output port 2, a second input and output port 15 and a third input and output port 16) are coaxial feeder lines, and are respectively extended and inserted into the first vertical metal cylinder 3 of the first-order coaxial resonant cavity, the first resonant rod 11 of the right-side third-order coaxial resonant cavity and the second resonant rod 14 of the back third-order coaxial resonant cavity, and the characteristic impedance of the resonant rod is 50 omega.
The center frequencies of the coaxial cavity duplexer are designed to be 1000MHz and 1800 MHz. The three-dimensional simulation software HFSS is used for simulating and optimizing the coaxial dual-frequency filter, and the optimized main structural parameters are as follows:
L4＝19mm,L8＝24mm,L6＝5mm,L10＝10.4mm,L13＝8.5mm,H3＝61mm,H7＝58mm,H11＝38.5mm,H14＝71mm。
as shown in fig. 3, a scattering simulation result of the coaxial cavity duplexer of the embodiment is shown. The horizontal axis represents input signal frequency, ranging from 0.5GHz to 3.0GHz, and the vertical axis represents amplitude, including return loss S11Amplitude and insertion loss S of21And S31Of the amplitude of (c). The center working frequency of the duplexer is 1000MHZ and 1800MHZ, the 3dB relative bandwidth is 14.47 percent and 7.6 percent respectively, and the insertion loss is 0.059d respectivelyB,0.0515dB, the return loss is reduced to below 15 dB. As can be seen from the figure, the coaxial cavity duplexer has the advantages of wide bandwidth, good performance, high isolation and the like.
To sum up, the utility model provides a coaxial cavity duplexer, it compares with traditional coaxial duplexer, has shared two preceding rank resonant cavities, takes out the frequency channel of high frequency and low frequency respectively in the third order resonant cavity at right side and back, can realize the miniaturization. In a word, the utility model has the advantages of compact structure is simple, and is small, and dual-band passband loss is low, and the selectivity is good, has actual spreading value, is worth promoting.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that all the changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.
Claims (3)
1. A coaxial cavity duplexer is characterized in that: comprises a closed metal cavity and an input/output port; the whole shape of the metal cavity is in a shape of a Chinese character 'tu', four resonant cavities are divided, three parts protruding outwards are respectively one, and the rest middle part is one, wherein the resonant cavity in the middle part is a second-order coaxial resonant cavity, the resonant cavity positioned on the left side of the second-order coaxial resonant cavity is a first-order coaxial resonant cavity, the resonant cavity positioned on the right side of the second-order coaxial resonant cavity is a right third-order coaxial resonant cavity, the resonant cavity positioned on 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 and have double-frequency characteristics, the right third-order coaxial resonant cavity and the back third-order coaxial resonant cavity are single-frequency resonant cavities, and respective single-; 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 second coupling resonant window on the right side and a second coupling resonant window on the back; a first vertical metal cylinder and a first horizontal metal cylinder are arranged in the first-order coaxial resonant cavity, 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-circuit end, 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, a 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, a second resonant frequency is controlled only by the height of the first vertical metal cylinder, and then a relatively independently controlled double-frequency characteristic is obtained, and the second resonant frequency is; a second vertical metal cylinder and a second horizontal metal cylinder are arranged in the second-order coaxial resonant cavity, the second horizontal metal cylinder 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, 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-circuit end, two ends of the second vertical metal cylinder are open-circuited, the distances between the two ends of the second vertical metal cylinder and the top and the bottom of the second-order coaxial resonant cavity are equal, a 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 a second resonant frequency is controlled only by the height of the second vertical metal cylinder, so; 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 and is a short-circuit end, 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 first two-order common 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-circuit, 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 first two-order common 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 perpendicular to the straight line where the circle centers of the first horizontal metal cylinder and the second horizontal metal cylinder are located, the first coupling window is located 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 resonant 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 resonant rod, the circle center of the second coupling junction and the circle center of the second vertical metal cylinder and the circle center of the first resonant rod are on the same straight line, the second coupling window is distributed on the cavity wall at two sides of the first resonant rod, and the second coupling junction and the second coupling window jointly control the coupling strength between the second-order coaxial resonant cavity and the right third-order coaxial resonant 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 and the circle center of the second vertical metal cylinder and the second resonant rod are on the same straight line, 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 and output ports are respectively a first input and output port, a second input and output port and a third input and output port, are coaxial feeder lines and are respectively and extendedly inserted into a first vertical metal cylinder of the 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.
2. The coaxial cavity duplexer 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 mounting three input and output ports.
3. The coaxial cavity duplexer of claim 1, wherein: the first vertical metal cylinder, the second vertical metal cylinder, the first resonance rod and the second resonance rod are of a hollow structure or a solid structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110444845A (en) * | 2019-07-25 | 2019-11-12 | 华南理工大学 | A kind of coaxial cavity duplexer |
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| CN110444845A (en) * | 2019-07-25 | 2019-11-12 | 华南理工大学 | A kind of coaxial cavity duplexer |
| CN110444845B (en) * | 2019-07-25 | 2024-01-26 | 华南理工大学 | Coaxial cavity duplexer |
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