CN114335945A - Miniaturized high-isolation duplex device - Google Patents
Miniaturized high-isolation duplex device Download PDFInfo
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- CN114335945A CN114335945A CN202111586051.3A CN202111586051A CN114335945A CN 114335945 A CN114335945 A CN 114335945A CN 202111586051 A CN202111586051 A CN 202111586051A CN 114335945 A CN114335945 A CN 114335945A
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Abstract
The invention discloses a miniaturized high-isolation duplex device, and belongs to the technical field of communication. The device comprises a broadband impedance converter, a combiner, a high-frequency filter and a low-frequency filter; the first input/output port of the low-frequency filter, the first input/output port of the broadband impedance converter and the first input/output port of the high-frequency filter are connected with the combiner, wherein the second input/output port of the high-frequency filter is connected with the high-frequency interface, the second input/output port of the low-frequency filter is connected with the low-frequency interface, and the second input/output port of the broadband impedance converter is connected with the antenna port. The invention fully utilizes the idle space, has small volume and light weight, and meets the requirements of communication equipment on equipment miniaturization, low loss and quick switching.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a miniaturized high-isolation duplex device.
Background
At present, in a communication system, a module at a radio frequency front end and an antenna feed source are often in a split structure, and the module and the antenna feed source are connected in a feeder way such as a radio frequency coaxial cable or a waveguide. Although the radio frequency cable connection has the characteristics of convenient connection, easy disassembly and the like, in specific engineering application, the radio frequency cable connection belongs to a frequently disassembled part because the radio frequency cable connection is positioned at the front end of a radio frequency, and the problems of breakage, poor contact, connector plug damage and the like easily occur, so that the insertion loss is increased. In a communication system, a radio frequency front end module and a radio frequency cable are positioned between a low-noise amplifier and an antenna feed source, and the insertion loss of the radio frequency front end module and the radio frequency cable directly affects the noise coefficient of a receiving channel, so that the threshold of a receiver of the communication system is affected, and the overall index is reduced, therefore, the wiring loss between the radio frequency front end and the feed source is reduced as much as possible during design, wherein the most direct mode is to directly connect a duplex device and a feed source waveguide port.
The feed source mode of the parabolic antenna is either positive feed or offset feed, the feed source can shield the radiation and the reception of the antenna surface to a certain extent, and the overall efficiency and the gain of the antenna are reduced to some extent, but the feed source is inherent to the antenna and cannot be replaced or cancelled. The sectional area of a radio frequency front end module connected with the antenna feed source is reduced as much as possible during design, so that the requirement of a miniaturized radio frequency front end component with the sectional area not larger than that of the antenna feed source is clear. On the order of tens of watts of passing power, it is common for two combline structure filters to be combined into a duplexer by a combiner. The conventional broadband comb line structure filter has strong coupling among cavities, and the leakage between non-adjacent cavities easily causes the deterioration of stop band rejection degree and reduces, and is lower than a theoretical value by more than ten decibels. Achieving a higher stopband rejection requires more orders, which makes the filter bulky.
Disclosure of Invention
In view of the above, the present invention provides a miniaturized duplex device with high isolation. The invention fully utilizes the idle space, has small volume and light weight, and meets the requirements of communication equipment on equipment miniaturization, low loss and quick switching.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a miniaturized high-isolation duplex device comprises a broadband impedance converter 1, a combiner 2, a high-frequency filter 3 and a low-frequency filter 4; the first input/output port of the low-frequency filter, the first input/output port of the broadband impedance converter and the first input/output port of the high-frequency filter are connected with the combiner, wherein the second input/output port of the high-frequency filter is connected with the high-frequency interface, the second input/output port of the low-frequency filter is connected with the low-frequency interface, and the second input/output port of the broadband impedance converter is connected with the antenna port;
when the duplex device is used as a type A machine, a transmitting signal enters the low-frequency filter 4 from the low-frequency interface and is sent to an antenna port through the low-end branch of the combiner 2 and the broadband impedance converter 1; a received signal is input from an antenna port, sequentially passes through the broadband impedance converter 1, a high-end branch of the combiner 2 and the high-frequency filter 3 and then is sent to a high-frequency interface for output;
when the duplex device is used as a B-type machine, a transmitting signal enters the high-frequency filter 3 from the high-frequency interface and is sent to an antenna port through the high-end branch of the combiner 2 and the broadband impedance converter 1; the received signal is input from the antenna port, sequentially passes through the broadband impedance converter 1, the low-end branch of the combiner 2 and the low-frequency filter 4, and then is sent to the low-frequency interface for output.
Further, the broadband impedance converter comprises a shell, wherein the broadband impedance converter 1, the combiner 2, the high-frequency filter 3 and the low-frequency filter 4 are all positioned in the shell; the high-frequency interface and the low-frequency interface are positioned outside the same wall surface of the shell, and the high-frequency interface and the low-frequency interface are centrosymmetric about the wall surface where the high-frequency interface and the low-frequency interface are positioned; the high-frequency interface 8 and the low-frequency interface 9 are coaxial quick-plugging interfaces.
The cavities of the high-frequency filter 3 and the low-frequency filter 4 both adopt a conformal arrangement structure, and the two cavities are respectively positioned at the upper side and the lower side of the wide surface of the waveguide outer wall of the broadband impedance transformer 2.
Further, the high-frequency filter 3 and the low-frequency filter 4 both adopt improved comb-line filters; one end of the improved comb-shaped line filter is open-circuited, the other end of the improved comb-shaped line filter is a short-circuited columnar resonator, and an isolation diaphragm 7 for improving stop band rejection degree is arranged between adjacent resonators in the improved comb-shaped line filter; and boss connecting structures 6 for realizing coupling between cavities are arranged at the short-circuit ends of the resonators in the improved comb-line filter.
Further, the broadband impedance converter 1 is a stepped impedance converter, and a first input/output port of the stepped impedance converter is an air medium coaxial interface and is located at an axial port of the waveguide; the combiner 2 is a coaxial '' type three-port structure, the middle coaxial inner conductor of the combiner is connected with the air medium coaxial interface of the broadband impedance converter 1, and the upper port and the lower port of the combiner are respectively connected with the first resonator of the high-frequency filter 3 and the first resonator of the low-frequency filter 4 through tap structures.
The invention adopts the technical scheme to produce the beneficial effects that:
1. the duplex device works in a frequency band C, and an antenna port in the duplex device adopts a waveguide port and can be directly connected with a feed source; the high-frequency interface and the low-frequency interface adopt symmetrical coaxial quick-plugging interfaces. The cavities of the high-frequency filter and the low-frequency filter in the duplex device are designed by adopting a conformal arrangement structure and are respectively positioned on the upper side and the lower side of the wide surface of the waveguide outer wall of the broadband impedance converter, so that the idle space is fully utilized, the size is small, the weight is light, and the requirements of communication equipment on equipment miniaturization, low loss and quick switching are met.
2. The duplex device adopts a scheme of combining first and then impedance transformation, the high-frequency filter and the low-frequency filter both adopt improved comb-line resonator structures, and the relatively large relative bandwidth of the low-frequency filter and the high-frequency filter is more than or equal to 20%, and meanwhile, the relatively high transceiving isolation is more than or equal to 90dB, and the requirement of communication equipment on the high transceiving isolation under the broadband of the duplex device is met.
Drawings
FIG. 1 is a schematic diagram showing the composition and operation of the type A machine according to the embodiment of the present invention;
FIG. 2 is a schematic diagram showing the composition and operation of the machine B according to the embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of an embodiment of the present invention;
FIG. 4 is a schematic diagram of a high frequency filter according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a low frequency filter structure according to an embodiment of the invention;
fig. 6 is a schematic interface diagram according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
A miniaturized high-isolation duplex device comprises a broadband impedance converter 1, a combiner 2, a high-frequency filter 3 and a low-frequency filter 4. The method is characterized in that: when the double-tool is an A-type machine, the low-frequency filter 4 is sequentially connected with the combiner 2 and the broadband impedance converter 1 to form a transmitting channel, a transmitting signal enters the low-frequency filter 4 from a low-frequency interface of a transmitting signal input port and is sent to the direction of an antenna port of a transmitting signal output port through a low-end branch of the combiner 2 and the broadband impedance converter 1; the broadband impedance converter 1 is connected with the combiner 2 and the high-frequency filter 3 in sequence to form a receiving channel, and a receiving signal is input from an antenna port of a receiving signal input port, sequentially passes through the broadband impedance converter 1, a high-end branch of the combiner 2 and the high-frequency filter 3 and then is sent to a high-frequency interface of a receiving signal output port.
When the double-tool is a B-type machine, the high-frequency filter 3 is sequentially connected with the combiner 2 and the broadband impedance converter 1 to form a transmitting channel, transmitting signals enter the high-frequency filter 3 from a high-frequency interface of a transmitting signal input port and are sent to the direction of an antenna port of a transmitting signal output port through a high-end branch of the combiner 2 and the broadband impedance converter 1; the broadband impedance converter 1 is connected with the combiner 2 and the low-frequency filter 4 in sequence to form a receiving channel, and a receiving signal is input from an antenna port of a receiving signal input port, passes through the broadband impedance converter 1, a low-end branch of the combiner 2 and the low-frequency filter 4 in sequence and then is sent to a low-frequency interface of a receiving signal output port.
The antenna port adopts a waveguide port and can be directly connected with a feed source; the high-frequency interface 8 and the low-frequency interface 9 adopt coaxial quick-plugging interfaces, the structure is symmetrical about the center, and the quick switching of A/B machine types can be realized by rotating 180 degrees. The cavities of the high-frequency filter 3 and the low-frequency filter 4 are designed by adopting a conformal arrangement structure and are respectively positioned on the upper side and the lower side of the wide surface of the waveguide outer wall of the broadband impedance converter 1, so that the idle space is fully utilized, and the height of the idle space is not more than that of a flange plate.
The duplex device adopts a scheme of combining first and then broadband impedance conversion, namely a high-frequency filter 3 and a low-frequency filter 4 are combined through a combiner 2 and then coaxially output, and then are converted into a waveguide port through a broadband impedance converter 1; the high-frequency filter 3 and the low-frequency filter 4 both adopt an improved combline resonator structure. The improved comb-line resonator structure comprises two newly-added structures besides the traditional cylindrical resonator 5 with one end open and one end short: the first new structure is different from the traditional comb line filter, an isolation diaphragm 7 is added between resonators with close distances, coupling leakage between non-adjacent cavities is reduced, and a stop-band rejection degree is improved, so that a high-isolation index of receiving and transmitting of the broadband duplex device is realized; the second new structure, different from the traditional comb line filter: at the short circuit end of each syntonizer, boss connection structure 6 has been increased, and coupling between the chamber of different intensity can be realized to different height or width boss connection structure 6, and coupling between each syntonizer 5 can be strengthened to this structure to can freely design the interval between each syntonizer to a certain extent, realize broadband work, reduce the structural design degree of difficulty, easily conformal structural design.
The broadband impedance converter 1 is a step impedance converter, and the output port is an air medium coaxial interface and is positioned in the axial direction of the waveguide. The combiner 2 is a coaxial type three-port structure, the middle coaxial inner conductor is connected with the coaxial interface of the broadband impedance converter 1, and the upper and lower ports are respectively connected with the first resonators of the high-frequency filter 3 and the low-frequency filter 4 in a tap structure mode.
FIG. 1 is a schematic diagram of the composition and workflow of the present invention. The duplex device consists of a broadband impedance transformer 1, a combiner 2, a high-frequency filter 3 and a low-frequency filter 4. When the double-device is an A-type machine, the low-frequency filter 4 is sequentially connected with the combiner 2 and the broadband impedance converter 1 to form a transmitting channel, a transmitting signal enters the low-frequency filter 4 from the low-frequency interface 9 of the transmitting signal input port and is sent to the direction of an antenna port of the transmitting signal output port through the low-end branch of the combiner 2 and the broadband impedance converter 1; the broadband impedance converter 1 is connected with the combiner 2 and the high-frequency filter 3 in sequence to form a receiving channel, and a receiving signal is input from an antenna port of a receiving signal input port, passes through the broadband impedance converter 1, a high-end branch of the combiner 2 and the high-frequency filter 3 in sequence and then is sent to a high-frequency interface 8 of a receiving signal output port.
FIG. 2 is a schematic flow chart of the operation of the B-type machine of the present invention. When the double-device is a B-type machine, the high-frequency filter 3 is sequentially connected with the combiner 2 and the broadband impedance converter 1 to form a transmitting channel, a transmitting signal enters the high-frequency filter 3 from a high-frequency interface 8 of a transmitting signal input port and is sent to the direction of an antenna port of a transmitting signal output port through a high-end branch of the combiner 2 and the broadband impedance converter 1; the broadband impedance converter 1 is connected with the combiner 2 and the low-frequency filter 4 in sequence to form a receiving channel, and a receiving signal is input from an antenna port of a receiving signal input port, passes through the broadband impedance converter 1, a low-end branch of the combiner 2 and the low-frequency filter 4 in sequence and then is sent to a low-frequency interface 9 of a receiving signal output port.
Fig. 3 is a schematic cross-sectional structure of the present invention. The overall structural layout of the wideband impedance transformer 1, the combiner 2, the high-frequency filter 3 and the low-frequency filter 4 of each component of the duplex device, the ladder structure of the wideband impedance transformer 1, the -type structure of the combiner 2, the improved comb resonator structures of the high-frequency filter 3 and the low-frequency filter 4 and the connection among the comb resonator structures are visually displayed.
Fig. 4 is a schematic structural diagram of the high-frequency filter of the present invention. The structural form and the cavity arrangement of the high-frequency filter, particularly the improved comb-line structure with the added isolating diaphragm and the boss connecting structure at the short circuit end between the adjacent cavities are clearly displayed.
Fig. 5 is a schematic structural diagram of the low frequency filter of the present invention. The structural form and the cavity arrangement of the low-frequency filter, particularly the improved comb-line structure with the added isolating diaphragm and the boss connecting structure at the short-circuit end between the adjacent cavities are clearly displayed.
The implementation scheme, conformal structure design, improved combline resonator structure with isolation diaphragm 7 added and boss connection structure 6 between adjacent resonator short-circuit ends of the duplex device in fig. 1 to 5 can meet the requirements of communication equipment on broadband operation, miniaturization and high isolation of the duplex device.
Fig. 6 is a schematic diagram of the high frequency interface and the low frequency interface of the present invention. The high-frequency interface 8 and the low-frequency interface 9 both adopt coaxial quick-plug interfaces, the structure is symmetrical about the center, the quick switching of the A/B type can be realized by rotating 180 degrees, and the requirement that the A/B type can be quickly switched by communication equipment is met.
The installation structure of the invention is as follows: the duplex device is positioned behind the feed source, and the maximum section of the duplex device is not larger than that of the feed source waveguide flange. The waveguide port of the duplex device is directly connected with the waveguide port of the antenna feed source by adopting a bolt, the A-type time high-frequency interface is connected with the radio frequency inlet of the low-noise amplifier, and the low-frequency interface is connected with the radio frequency output interface of the power amplifier. The time low frequency interface of the B type machine is connected with the radio frequency inlet of the low noise amplifier, and the high frequency interface is connected with the radio frequency output interface of the power amplifier.
Claims (4)
1. A miniaturized high-isolation duplex device comprises a broadband impedance converter (1), a combiner (2), a high-frequency filter (3) and a low-frequency filter (4); the first input/output port of the low-frequency filter, the first input/output port of the broadband impedance converter and the first input/output port of the high-frequency filter are connected with the combiner, wherein the second input/output port of the high-frequency filter is connected with the high-frequency interface, the second input/output port of the low-frequency filter is connected with the low-frequency interface, and the second input/output port of the broadband impedance converter is connected with the antenna port;
when the duplex device is used as a type A machine, a transmitting signal enters the low-frequency filter (4) from the low-frequency interface and is sent to an antenna port through a low-end branch of the combiner (2) and the broadband impedance converter (1); a received signal is input from an antenna port, sequentially passes through a broadband impedance converter (1), a high-end branch of a combiner (2) and a high-frequency filter (3) and then is sent to a high-frequency interface for output;
when the duplex device is used as a B-type machine, a transmitting signal enters the high-frequency filter (3) from the high-frequency interface and is sent to an antenna port through a high-end branch of the combiner (2) and the broadband impedance converter (1); the receiving signal is input from the antenna port, and is sequentially transmitted to the low-frequency interface for output after passing through the broadband impedance converter (1), the low-end branch of the combiner (2) and the low-frequency filter (4).
2. The miniaturized high-isolation duplex device according to claim 1, further comprising a housing, wherein the wideband impedance transformer (1), the combiner (2), the high-frequency filter (3) and the low-frequency filter (4) are all located in the housing; the high-frequency interface and the low-frequency interface are positioned outside the same wall surface of the shell, and the high-frequency interface and the low-frequency interface are centrosymmetric about the wall surface where the high-frequency interface and the low-frequency interface are positioned; the high-frequency interface (8) and the low-frequency interface (9) are coaxial quick-plugging interfaces.
The cavities of the high-frequency filter (3) and the low-frequency filter (4) are of conformal arrangement structures and are respectively positioned on the upper side and the lower side of the wide surface of the waveguide outer wall of the broadband impedance transformer (2).
3. A miniaturized high-isolation duplex unit according to claim 1, characterized in that the high-frequency filter (3) and the low-frequency filter (4) both use modified combline filters; one end of the improved comb-shaped line filter is open-circuited, the other end of the improved comb-shaped line filter is a short-circuited columnar resonator, and an isolation diaphragm (7) used for improving stop band rejection degree is arranged between adjacent resonators in the improved comb-shaped line filter; and boss connecting structures (6) for realizing coupling between cavities are arranged at the short-circuit ends of the resonators in the improved comb-line filter.
4. The miniaturized high-isolation duplex device according to claim 1, wherein the broadband impedance transformer (1) is a stepped impedance transformer, and the first input/output port of the stepped impedance transformer is an air dielectric coaxial interface and is located at the axial port of the waveguide; the combiner (2) is of a coaxial -type three-port structure, the middle coaxial inner conductor of the combiner is connected with the air medium coaxial interface of the broadband impedance converter (1), and the upper port and the lower port of the combiner are respectively connected with the first resonator of the high-frequency filter (3) and the first resonator of the low-frequency filter (4) through tap structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111586051.3A CN114335945A (en) | 2021-12-20 | 2021-12-20 | Miniaturized high-isolation duplex device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111586051.3A CN114335945A (en) | 2021-12-20 | 2021-12-20 | Miniaturized high-isolation duplex device |
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| Publication Number | Publication Date |
|---|---|
| CN114335945A true CN114335945A (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111586051.3A Pending CN114335945A (en) | 2021-12-20 | 2021-12-20 | Miniaturized high-isolation duplex device |
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| CN (1) | CN114335945A (en) |
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- 2021-12-20 CN CN202111586051.3A patent/CN114335945A/en active Pending
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