CN114070230A - Low-insertion-loss and high-suppression-degree full-duplex frequency division/combination module and implementation method - Google Patents
Low-insertion-loss and high-suppression-degree full-duplex frequency division/combination module and implementation method Download PDFInfo
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- CN114070230A CN114070230A CN202111237937.7A CN202111237937A CN114070230A CN 114070230 A CN114070230 A CN 114070230A CN 202111237937 A CN202111237937 A CN 202111237937A CN 114070230 A CN114070230 A CN 114070230A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/46—Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
- H03H7/463—Duplexers
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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Abstract
The invention discloses a full-duplex frequency division/combination module with low insertion loss and high suppression degree and an implementation method thereof, wherein the full-duplex frequency division/combination module comprises a 90-degree electric bridge, a plurality of band-pass filters and a matched load; a port P1 of the 90-degree bridge E1 is determined as a common port, a port P2 of the 90-degree bridge is connected with a filter B3, the other port of the filter B3 is determined as a branch port P2, ports P3 and P4 of the 90-degree bridge are respectively connected with a band-pass filter B4 and a band-pass filter B5, the band-pass filter B4 and the band-pass filter B5 are completely consistent in circuit structure, the other ports of the band-pass filter B4 and the band-pass filter B5 are respectively connected with a port P5 and a port P6 of the 90-degree bridge E2, a port P7 of the 90-degree bridge E2 is connected with a matched load, and a port P8 of the 90-degree bridge 2 is determined as a branch port P3. The invention has the advantages of simple structure, low insertion loss, high suppression degree, obvious ultra-wideband characteristic and the like.
Description
Technical Field
The invention relates to the technical field of microwave, in particular to a full-duplex frequency division/combination module with low insertion loss and high suppression degree and an implementation method.
Background
The ultra-wideband transceiver system occupies an important position in the microwave front end, and the performance of the ultra-wideband transceiver system directly influences the function of the system. The frequency division/combination technology is used in a receiving and transmitting system, a broadband signal is subjected to frequency division during receiving and then a plurality of paths of signals are output, the probability of signal interception is improved, and signals transmitted by various frequency bands are combined during transmitting and then enter a broadband transmitting circuit, so that simultaneous multi-signal transmission can be realized.
At present, the frequency division/combination technology is mainly realized by a duplexer (see figure 1) or a power divider + a filter (see figure 2). When the frequency division/combination technology is realized by adopting the duplexer, the ultra-wideband is difficult to realize; it is difficult to realize low insertion loss when the frequency division/combination technology is realized by adopting the combiner. The existing frequency division/combination technology implementation mode has the problems of narrow frequency band and large insertion loss.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a low-insertion-loss and high-rejection full-duplex frequency division/combination module and an implementation method thereof, and the full-duplex frequency division/combination module has the advantages of simple structure, low insertion loss, high rejection, obvious ultra-wideband characteristic and the like.
The purpose of the invention is realized by the following scheme:
a low insertion loss and high suppression degree full-duplex frequency division/combination circuit module comprises a 90-degree electric bridge, a plurality of band-pass filters and a matched load; a port P1 of the 90-degree bridge E1 is determined as a common port, a port P2 of the 90-degree bridge is connected with a filter B3, the other port of the filter B3 is determined as a branch port P2, ports P3 and P4 of the 90-degree bridge are respectively connected with a band-pass filter B4 and a band-pass filter B5, the band-pass filter B4 and the band-pass filter B5 are completely consistent in circuit structure, the other ports of the band-pass filter B4 and the band-pass filter B5 are respectively connected with a port P5 and a port P6 of the 90-degree bridge E2, a port P7 of the 90-degree bridge E2 is connected with a matched load, and a port P8 of the 90-degree bridge 2 is determined as a branch port P3.
Further, the 90-degree bridge E1 and the 90-degree bridge E2 are both broadband bridges, and the operating frequency band and the implementation manner thereof can be determined by requirements.
Further, the center frequency of the band-pass filter B3 is f2Relative bandwidth, pair f1The degree of suppression and implementation can be determined by the need.
Further, the center frequency of the band-pass filters B4 and B5 is f1Relative bandwidth, pair f2The degree of suppression and the implementation can be determined by the requirements, and the circuit structures of the band-pass filter B4 and the band-pass filter B5 are completely the same, and the two have strict requirements on amplitude-phase consistency.
Further, the matched load comprises a 50 ohm matched load, the standing wave, power and implementation of which can be dependent on the requirements.
A full duplex frequency division/combination implementation method based on the full duplex frequency division/combination module with low insertion loss and high suppression degree comprises the following steps:
when operating in frequency division mode, f is included1And f2The broadband radio-frequency signal enters a port p1 of a 90-degree bridge E1 through a common port, the broadband radio-frequency signal reaches a port p3 and a port p4 after being divided by 90 degrees, and a constant-amplitude signal f with 90 degrees of phase difference1The signal enters a band-pass filter B4 and a band-pass filter B5, and then reaches a branch port P3 through a port P8 of a 90-degree bridge E2 to be output; and two paths of equal-amplitude signals f with 90-degree phase difference2Will be reflected by the band-pass filter B4 and the band-pass filter B5, reach the band-pass filter B3 through the 90-degree bridge E1, output to the port P2 of the branch road after the frequency selection;
when working in the combining mode, the center frequency is f1And f2Respectively enters a 90-degree bridge E2 and a 90-degree bridge E1 through a branch port P3 and a branch port P2, and the center frequency is f1The radio frequency signal is equally divided into two paths of signals with 90-degree phase difference, the two paths of signals are respectively subjected to the bandpass filter B4 and the bandpass filter B5, then are synthesized by a 90-degree bridge E1 and then are output to a public port; center frequency of f2The radio frequency signal is equally divided into two paths of signals with 90-degree phase difference by a 90-degree bridge E1, the two paths of signals are totally reflected by a band-pass filter B4 and a band-pass filter B5, and then the two paths of signals are synthesized by a 90-degree bridge E1 and output to a public port, so that the signal f is realized1And f2And (4) synthesizing.
The beneficial effects of the invention include:
the invention provides a full-duplex frequency division/combination module with simple structure, low insertion loss and high suppression degree and an implementation method thereof, which have obvious ultra-wideband characteristics, are mainly used for a receiving or transmitting front-end circuit, are used for generally dividing received broadband signals during receiving and are generally combined with narrow-band signals during transmitting.
The core circuit of the embodiment of the invention mainly comprises a broadband 90-degree bridge, a band-pass filter, a matched load and the like, wherein the 90-degree bridge E1//2 plays a role in broadband matching, equal division or signal synthesis for the broadband bridge; band-pass filter B3 for f2Gating of signals, pair f1Suppression of the signal; band-pass filter B4/5 realizes pair f1Gating of signals, pair f2Suppression of the signal; the matched load realizes the matched connection of the circuit. In addition, the embodiment of the invention is tested and verified in a 6-18 GHz ultra-wideband front-end component, and dual-tone signals can be separated or combined, so that the insertion loss and out-of-band rejection degree (relative to a single band-pass filter) of the dual-tone signal are obviously improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a disadvantage of a conventional duplexer implemented frequency division/combination circuit, which is difficult to be ultra-wideband, and whose out-of-band rejection degree depends only on the filter itself;
fig. 2 is a frequency division/combination circuit implemented by a conventional power divider and a filter, which has the disadvantages of large insertion loss and the out-of-band rejection degree only depending on the characteristics of the filter;
fig. 3 is a schematic circuit block diagram of a full-duplex frequency division/combining module with a simple structure, low insertion loss and high suppression degree according to an embodiment of the present invention, and has the advantages of small circuit insertion loss and improved suppression degree.
Detailed Description
All features disclosed in all embodiments in this specification, or all methods or process steps implicitly disclosed, may be combined and/or expanded, or substituted, in any way, except for mutually exclusive features and/or steps.
As shown in fig. 3, a low-insertion loss and high-rejection full-duplex frequency division/combination module includes a 90-degree bridge, a plurality of band-pass filters, and a matching load; a port P1 of the 90-degree bridge E1 is determined as a common port, a port P2 of the 90-degree bridge is connected with a filter B3, the other port of the filter B3 is determined as a branch port P2, ports P3 and P4 of the 90-degree bridge are respectively connected with a band-pass filter B4 and a band-pass filter B5, the band-pass filter B4 and the band-pass filter B5 are completely consistent in circuit structure, the other ports of the band-pass filter B4 and the band-pass filter B5 are respectively connected with a port P5 and a port P6 of the 90-degree bridge E2, a port P7 of the 90-degree bridge E2 is connected with a matched load, and a port P8 of the 90-degree bridge 2 is determined as a branch port P3.
In an alternative embodiment, it should be noted that the 90-degree bridge E1 and the 90-degree bridge E2 are both broadband bridges, and the operating frequency band and the implementation mode thereof can be determined by requirements.
In an alternative embodiment, it should be noted that the center frequency of the band-pass filter B3 is f2Relative bandwidth, pair f1The degree of suppression and implementation can be determined by the need.
In an alternative embodiment, the center frequencies of the band pass filters B4 and B5 are f1Relative bandwidth, pair f2The degree of suppression and the implementation can be determined by the requirements, and the circuit structures of the band-pass filter B4 and the band-pass filter B5 are completely the same, and the two have strict requirements on amplitude-phase consistency.
In an alternative embodiment, it should be noted that the matched load includes a 50 ohm matched load, and the standing wave, the power and the implementation thereof can be determined by the requirement.
In an optional embodiment, a full-duplex frequency division/combining implementation method based on any one of the above-mentioned low-insertion-loss and high-rejection full-duplex frequency division/combining modules includes the steps of:
when operating in frequency division mode, f is included1And f2The broadband radio-frequency signal enters a port p1 of a 90-degree bridge E1 through a common port, the broadband radio-frequency signal reaches a port p3 and a port p4 after being divided by 90 degrees, and a constant-amplitude signal f with 90 degrees of phase difference1The signal enters a band-pass filter B4 and a band-pass filter B5, and then reaches a branch port P3 through a port P8 of a 90-degree bridge E2 to be output; and two paths of equal-amplitude signals f with 90-degree phase difference2Will be reflected by the band-pass filter B4 and the band-pass filter B5, reach the band-pass filter B3 through the 90-degree bridge E1, output to the port P2 of the branch road after the frequency selection; when working in the combining mode, the center frequency is f1And f2Respectively enters a 90-degree bridge E2 and a 90-degree bridge E1 through a branch port P3 and a branch port P2, and the center frequency is f1The radio frequency signal is equally divided into two paths of signals with 90-degree phase difference, the two paths of signals are respectively subjected to the bandpass filter B4 and the bandpass filter B5, then are synthesized by a 90-degree bridge E1 and then are output to a public port; center frequency of f2The radio frequency signal is equally divided into two paths of signals with 90-degree phase difference by a 90-degree bridge E1, the two paths of signals are totally reflected by a band-pass filter B4 and a band-pass filter B5, and then the two paths of signals are synthesized by a 90-degree bridge E1 and output to a public port, so that the signal f is realized1And f2And (4) synthesizing.
According to the embodiments, the invention can realize frequency division or synthesis of radio frequency signals. Let the inherent insertion loss of the 90-degree bridges E1 and E2 be IL1Insertion loss IL of band-pass filters B3, B4 and B5 with ISO isolation2Bandpass filter B3 for signal f1Is suppressed to AC1Band pass filter B4 or B5 and pair signal f2Is suppressed to AC2Then f1And f2The insertion loss and the suppression degree of the broadband radio-frequency signal after passing through the circuit are detailed as follows:
a) f output via branch port P31Insertion loss and pair of signals f2The inhibition of (a) is as follows:
ILf1＝2*IL1+IL2
ACf2＝AC2+6dB
b) f output via branch port P22Insertion loss and pair of signals f1The inhibition of (a) is as follows:
ILf2＝2*IL1+IL2
ACf1＝min(AC1+AC2，AC1+ISO)
through the analysis, compared with the traditional implementation mode of the power divider and the filter (see the attached figure 2), the insertion loss and the suppression degree are obviously improved, compared with the traditional implementation mode of the duplexer (see the attached figure 1), the suppression degree is obviously improved, and due to the existence of the 90-degree 3dB bridge, the ultra-wideband duplexer has the obvious ultra-wideband characteristic.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
The above-described embodiment is only one embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be easily made based on the application and principle of the present invention disclosed in the present application, and the present invention is not limited to the method described in the above-described embodiment of the present invention, so that the above-described embodiment is only preferred, and not restrictive.
Other embodiments than the above examples may be devised by those skilled in the art based on the foregoing disclosure, or by adapting and using knowledge or techniques of the relevant art, and features of various embodiments may be interchanged or substituted and such modifications and variations that may be made by those skilled in the art without departing from the spirit and scope of the present invention are intended to be within the scope of the following claims.
Claims (6)
1. A low insertion loss and high suppression degree full-duplex frequency division/combination circuit module is characterized by comprising a 90-degree electric bridge, a plurality of band-pass filters and a matched load; a port P1 of the 90-degree bridge E1 is determined as a common port, a port P2 of the 90-degree bridge is connected with a filter B3, the other port of the filter B3 is determined as a branch port P2, ports P3 and P4 of the 90-degree bridge are respectively connected with a band-pass filter B4 and a band-pass filter B5, the band-pass filter B4 and the band-pass filter B5 are completely consistent in circuit structure, the other ports of the band-pass filter B4 and the band-pass filter B5 are respectively connected with a port P5 and a port P6 of the 90-degree bridge E2, a port P7 of the 90-degree bridge E2 is connected with a matched load, and a port P8 of the 90-degree bridge 2 is determined as a branch port P3.
2. The low-insertion-loss and high-rejection full-duplex frequency division/combination module as claimed in claim 1, wherein the 90-degree bridges E1 and E2 are wideband bridges, and the operating frequency band and implementation thereof can be determined by requirements.
3. The low insertion loss, high rejection full duplex frequency division/combining module of claim 1 wherein said band pass filter B3 is centered at f2Relative bandwidth, pair f1The degree of suppression and implementation can be determined by the need.
4. The low insertion loss, high rejection full duplex frequency division/combining module of claim 1, wherein said band pass filters B4, B5 have center frequency f1Relative bandwidth, pair f2The degree of suppression and the implementation can be determined by the requirements, and the circuit structures of the band-pass filter B4 and the band-pass filter B5 are completely the same, and the two have strict requirements on amplitude-phase consistency.
5. The low insertion loss, high rejection full duplex frequency division/combining module of claim 1 wherein the matched load comprises a 50 ohm matched load whose standing wave, power carrying and implementation can be determined by requirements.
6. A full-duplex frequency division/combination implementation method based on the low-insertion-loss and high-suppression full-duplex frequency division/combination module of any one of claims 1 to 5, comprising the steps of:
when operating in frequency division mode, f is included1And f2The broadband radio-frequency signal enters a port p1 of a 90-degree bridge E1 through a common port, the broadband radio-frequency signal reaches a port p3 and a port p4 after being divided by 90 degrees, and a constant-amplitude signal f with 90 degrees of phase difference1The signal enters a band-pass filter B4 and a band-pass filter B5, and then reaches a branch port P3 through a port P8 of a 90-degree bridge E2 to be output; and two paths of equal-amplitude signals f with 90-degree phase difference2Will be reflected by the band-pass filter B4 and the band-pass filter B5, reach the band-pass filter B3 through the 90-degree bridge E1, output to the port P2 of the branch road after the frequency selection;
when working in the combining mode, the center frequency is f1And f2Respectively enters a 90-degree bridge E2 and a 90-degree bridge E1 through a branch port P3 and a branch port P2, and the center frequency is f1The radio frequency signal is equally divided into two paths of signals with 90-degree phase difference, the two paths of signals are respectively subjected to the bandpass filter B4 and the bandpass filter B5, then are synthesized by a 90-degree bridge E1 and then are output to a public port; center frequency of f2The radio frequency signal is equally divided into two paths of signals with 90-degree phase difference by a 90-degree bridge E1, the two paths of signals are totally reflected by a band-pass filter B4 and a band-pass filter B5, and then the two paths of signals are synthesized by a 90-degree bridge E1 and output to a public port, so that the signal f is realized1And f2And (4) synthesizing.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2777771Y (en) * | 2004-11-30 | 2006-05-03 | 深圳市信特科技有限公司 | Hybrid electric bridge filter |
| CN207705368U (en) * | 2018-01-19 | 2018-08-07 | 重庆华伟工业（集团）有限责任公司 | Hybrid antenna combiner |
| CN110931924A (en) * | 2019-12-27 | 2020-03-27 | 深圳波而特电子科技有限公司 | Novel absorption type functional band-pass filter based on phase difference principle |
| CN110931923A (en) * | 2019-12-18 | 2020-03-27 | 成都九洲迪飞科技有限责任公司 | Microstrip continuous passband broadband duplexer based on multiple broadband bridges and bandpass filters |
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2021
- 2021-10-25 CN CN202111237937.7A patent/CN114070230A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2777771Y (en) * | 2004-11-30 | 2006-05-03 | 深圳市信特科技有限公司 | Hybrid electric bridge filter |
| CN207705368U (en) * | 2018-01-19 | 2018-08-07 | 重庆华伟工业（集团）有限责任公司 | Hybrid antenna combiner |
| CN110931923A (en) * | 2019-12-18 | 2020-03-27 | 成都九洲迪飞科技有限责任公司 | Microstrip continuous passband broadband duplexer based on multiple broadband bridges and bandpass filters |
| CN110931924A (en) * | 2019-12-27 | 2020-03-27 | 深圳波而特电子科技有限公司 | Novel absorption type functional band-pass filter based on phase difference principle |
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