CN110931924A - Novel absorption type functional band-pass filter based on phase difference principle - Google Patents
Novel absorption type functional band-pass filter based on phase difference principle Download PDFInfo
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- CN110931924A CN110931924A CN201911376645.4A CN201911376645A CN110931924A CN 110931924 A CN110931924 A CN 110931924A CN 201911376645 A CN201911376645 A CN 201911376645A CN 110931924 A CN110931924 A CN 110931924A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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Abstract
The invention discloses a novel absorption type functional band-pass filter based on a phase difference principle, which belongs to the technical field of communication and comprises a port P1, a port P3, a port P2, a port P4, a first bridge, a second bridge, a first band-pass filter and a second band-pass filter, and solves the technical problem of reducing crosstalk in a transmission path in an electronic system sensitive to a reflection signal.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a novel absorption type functional band-pass filter based on a phase difference principle.
Background
In many practical communication systems, the reflection of the signal from the reflection filter back to the input port has a certain effect on the overall system performance, especially in systems with high stability requirements or high sensitivity requirements. Of these highly demanding systems, absorptive filters are more appropriate to select to prevent unwanted oscillations or feedback from the circuit, thereby greatly reducing interference with the system.
Disclosure of Invention
The invention aims to provide a novel absorption type functional band-pass filter based on a phase difference principle, which solves the technical problem of reducing crosstalk in a transmission path in an electronic system sensitive to a reflected signal.
In order to achieve the purpose, the invention adopts the following technical scheme:
a novel absorption type functional band-pass filter based on a phase difference principle comprises a port P1, a port P3, a port P2, a port P4, a first electric bridge, a second electric bridge, a first band-pass filter and a second band-pass filter, wherein the port P1 and the port P3 are respectively connected with two input ends of the first electric bridge, the input end of the first band-pass filter is connected with one output end of the first electric bridge, and the input end of the second band-pass filter is connected with the other output end of the first electric bridge;
the output end of the first band-pass filter is connected with one input end of the second bridge, the output end of the second band-pass filter is connected with the other input end of the second bridge, and the port P2 and the port P4 are respectively connected with two output ends of the second bridge.
Preferably, the first bridge and the second bridge are used for changing the phase of an input signal, and after the input signal is input from the port P1, the first bridge changes the input signal from one path into two paths, and the two paths of signals are respectively set as a signal S1 and a signal S2;
the phase of the signal S1 changes to-90 degrees, the phase of the signal output by the first band-pass filter changes to-90 degrees + a, the signal S1 passes through the second bridge again and is divided into two parts again, the two paths of signals are set to be a signal S3 and a signal S4 respectively, the signal S3 reaches a P2 port, the phase of the signal S3 changes to-180 degrees + a, the signal S4 reaches the P4 port, and the phase of the signal S4 changes to-270 degrees + a;
the phase of the signal S2 changes to-180 degrees, the phase of the signal output by the second band-pass filter changes to-180 degrees + a, the signal passes through the second bridge and is divided into two parts again, the two paths of signals are set to be the signal S5 and the signal S6 respectively, the signal S5 reaches a P2 port, the phase changes to-360 degrees + a, the signal S6 reaches a P4 port, and the phase changes to-270 degrees + a.
Preferably, an input signal is input from a port P1, and is changed from one path to two paths by a first bridge signal, the two paths of signals are set as the signal S1 and the signal S2, the phase of the signal S1 changes to-90 °, the phase of the signal S2 changes to-180 °, the signal S1 is reflected at the input end of a first band-pass filter, the signal is set as a reflected signal 1, the phase of the reflected signal 1 changes to-90 °, the signal S2 is reflected at the input end of a second band-pass filter, the signal is set as a reflected signal 2, and the phase of the reflected signal 2 changes to-180 °;
the reflected signal 1 passes through a first bridge, a branch circuit is divided into two paths, the two paths of signals are set to be a reflected signal 3 and a reflected signal 4, the phase change of the reflected signal 3 is-180 degrees and reaches a P1 port, and the phase change of the reflected signal 4 is-270 degrees and reaches a P3 port; meanwhile, the reflected signal 2 passes through the first bridge, and is divided into a reflected signal 5 and a reflected signal 6, wherein the phase of the reflected signal 5 is changed to-360 degrees and reaches the port P1, and the phase of the reflected signal 6 is changed to-270 degrees and reaches the port P3.
Preferably, the port P3 is connected to a matched load.
Preferably, the port P1, the port P3, the port P2, the port P4, the first bridge, the second bridge, the first band pass filter and the second band pass filter are all fabricated by LTCC process.
The invention relates to a novel absorption type functional band-pass filter based on a phase difference principle, which solves the technical problem of reducing crosstalk in a transmission path in an electronic system sensitive to a reflection signal.
Drawings
FIG. 1 is a schematic diagram of the circuit configuration of the present invention;
FIG. 2 is a graph of the phase analysis of the input signal of the present invention;
FIG. 3 is a graph of the phase analysis of the reflected signal of the present invention;
fig. 4 is a graph of the output characteristic of the present invention.
Detailed Description
1-4, the novel absorption-type functional band-pass filter based on the phase difference principle includes a port P1, a port P3, a port P2, a port P4, a first bridge, a second bridge, a first band-pass filter and a second band-pass filter, the port P1 and the port P3 are respectively connected to two input ends of the first bridge, an input end of the first band-pass filter is connected to one output end of the first bridge, and an input end of the second band-pass filter is connected to the other output end of the first bridge;
the output end of the first band-pass filter is connected with one input end of the second bridge, the output end of the second band-pass filter is connected with the other input end of the second bridge, and the port P2 and the port P4 are respectively connected with two output ends of the second bridge.
Preferably, the first bridge and the second bridge are used for changing the phase of an input signal, and after the input signal is input from the port P1, the first bridge changes the input signal from one path into two paths, and the two paths of signals are respectively set as a signal S1 and a signal S2;
at this time, the port of the first bridge connected to the port P1 is the input end of the first bridge, and the port of the first bridge connected to the port P3 is the isolated end of the first bridge;
the phase of the signal S1 changes to-90 degrees, the phase of the signal output by the first band-pass filter changes to-90 degrees + a, the signal S1 passes through the second bridge again and is divided into two parts again, the two paths of signals are set to be a signal S3 and a signal S4 respectively, the signal S3 reaches a P2 port, the phase of the signal S3 changes to-180 degrees + a, the signal S4 reaches the P4 port, and the phase of the signal S4 changes to-270 degrees + a;
the port of the second bridge connected with the port P2 is a coupling end of the second bridge, and the port of the second bridge connected with the port P4 is a through end of the second bridge;
the phase of the signal S2 changes to-180 degrees, the phase of the signal output by the second band-pass filter changes to-180 degrees + a, the signal passes through the second bridge and is divided into two parts again, the two paths of signals are set to be the signal S5 and the signal S6 respectively, the signal S5 reaches a P2 port, the phase changes to-360 degrees + a, the signal S6 reaches a P4 port, and the phase changes to-270 degrees + a.
The phase principle of the reflected signal of the invention is as follows: an input signal is input from a port P1, one path of the input signal is changed into two paths of the input signal through a first bridge signal, the two paths of the input signal are respectively set as a signal S1 and a signal S2, the phase of the signal S1 is changed to-90 degrees, the phase of the signal S2 is changed to-180 degrees, the signal S1 is reflected at the input end of a first band-pass filter, the signal is set as a reflected signal 1, the phase of the reflected signal 1 is changed to-90 degrees, the signal S2 is reflected at the input end of a second band-pass filter, the signal is set as a reflected signal 2, and the phase of the reflected signal 2;
the reflected signal 1 passes through a first bridge, a branch circuit is divided into two paths, the two paths of signals are set to be a reflected signal 3 and a reflected signal 4, the phase change of the reflected signal 3 is-180 degrees and reaches a P1 port, and the phase change of the reflected signal 4 is-270 degrees and reaches a P3 port; meanwhile, the reflected signal 2 passes through the first bridge, and is divided into a reflected signal 5 and a reflected signal 6, wherein the phase of the reflected signal 5 is changed to-360 degrees and reaches the port P1, and the phase of the reflected signal 6 is changed to-270 degrees and reaches the port P3.
At the moment, signals of the P1 port and the P3 port are analyzed, the P1 port is two paths of signals with the phase difference of 180 degrees, the signals are mutually offset, no signal is output from the P1 port, the P3 port is two paths of signals with the phase change of-270 degrees, and the two paths of signals are combined and output at the P3. The signal is absorbed by the matched load when it is connected to the port P3.
As shown in fig. 3, if an input signal is input from the P1 port, no signal is output from the P2 port, the P3 signal is absorbed by the matched load, and the P4 port is a signal output port.
Preferably, the port P3 is connected to a matched load to absorb signals.
Preferably, the port P1, the port P3, the port P2, the port P4, the first bridge, the second bridge, the first band pass filter and the second band pass filter are all fabricated by LTCC process.
As shown in FIG. 4, it can be seen that the band-pass filter has a frequency range of 2.85-3.25GHz and steep out-of-band rejection, and the emphasis is that the return loss is good, the stop-band signal absorption is good, and the return loss is less than 20Db in a wide frequency range, so that no reflection can be realized.
The invention relates to a novel absorption type functional band-pass filter based on a phase difference principle, which solves the technical problem of reducing crosstalk in a transmission path in an electronic system sensitive to a reflection signal, changes input and output signals of the signal by skillfully combining an electric bridge and the band-pass filter based on the phase difference principle and utilizing the phase difference principle of the electric bridge, has the advantages of small volume, easiness in processing, high stop band inhibition, good stop band signal absorption, effective reduction of crosstalk in each transmission path and good application advantages in a plurality of electronic systems sensitive to the reflection signal, adopts an LTCC technology, and has small volume, light weight and high reliability; mass production can be realized; the stopband signal absorption is good.
Claims (5)
1. The utility model provides a novel absorption formula function band-pass filter based on phase difference principle which characterized in that: the circuit comprises a port P1, a port P3, a port P2, a port P4, a first bridge, a second bridge, a first band-pass filter and a second band-pass filter, wherein the port P1 and the port P3 are respectively connected with two input ends of the first bridge, the input end of the first band-pass filter is connected with one output end of the first bridge, and the input end of the second band-pass filter is connected with the other output end of the first bridge;
the output end of the first band-pass filter is connected with one input end of the second bridge, the output end of the second band-pass filter is connected with the other input end of the second bridge, and the port P2 and the port P4 are respectively connected with two output ends of the second bridge.
2. A novel absorption-type functional band-pass filter based on the phase difference principle as claimed in claim 1, wherein: the first bridge and the second bridge are used for changing the phase of an input signal, after the input signal is input from the port P1, the first bridge changes one path of the input signal into two paths of the input signal, and the two paths of the input signal are respectively set as a signal S1 and a signal S2;
the phase of the signal S1 changes to-90 degrees, the phase of the signal output by the first band-pass filter changes to-90 degrees + a, the signal S1 passes through the second bridge again and is divided into two parts again, the two paths of signals are set to be a signal S3 and a signal S4 respectively, the signal S3 reaches a P2 port, the phase of the signal S3 changes to-180 degrees + a, the signal S4 reaches the P4 port, and the phase of the signal S4 changes to-270 degrees + a;
the phase of the signal S2 changes to-180 degrees, the phase of the signal output by the second band-pass filter changes to-180 degrees + a, the signal passes through the second bridge and is divided into two parts again, the two paths of signals are set to be the signal S5 and the signal S6 respectively, the signal S5 reaches a P2 port, the phase changes to-360 degrees + a, the signal S6 reaches a P4 port, and the phase changes to-270 degrees + a.
3. A novel absorption-type functional band-pass filter based on the phase difference principle as claimed in claim 2, wherein: an input signal is input from a port P1, one path of the input signal is changed into two paths of the input signal through a first bridge signal, the two paths of the input signal are respectively set as a signal S1 and a signal S2, the phase of the signal S1 is changed to-90 degrees, the phase of the signal S2 is changed to-180 degrees, the signal S1 is reflected at the input end of a first band-pass filter, the signal is set as a reflected signal 1, the phase of the reflected signal 1 is changed to-90 degrees, the signal S2 is reflected at the input end of a second band-pass filter, the signal is set as a reflected signal 2, and the phase of the reflected signal 2 is changed to-180 degrees;
the reflected signal 1 passes through a first bridge, a branch circuit is divided into two paths, the two paths of signals are set to be a reflected signal 3 and a reflected signal 4, the phase change of the reflected signal 3 is-180 degrees and reaches a P1 port, and the phase change of the reflected signal 4 is-270 degrees and reaches a P3 port; meanwhile, the reflected signal 2 passes through the first bridge, and is divided into a reflected signal 5 and a reflected signal 6, wherein the phase of the reflected signal 5 is changed to-360 degrees and reaches the port P1, and the phase of the reflected signal 6 is changed to-270 degrees and reaches the port P3.
4. A novel absorption-type functional band-pass filter based on the phase difference principle as claimed in claim 1, wherein: the port P3 is connected to a matched load.
5. A novel absorption-type functional band-pass filter based on the phase difference principle as claimed in claim 1, wherein: the port P1, the port P3, the port P2, the port P4, the first bridge, the second bridge, the first bandpass filter and the second bandpass filter are all fabricated by LTCC process.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114070230A (en) * | 2021-10-25 | 2022-02-18 | 中国电子科技集团公司第二十九研究所 | Low-insertion-loss and high-suppression-degree full-duplex frequency division/combination module and implementation method |
| CN117498806A (en) * | 2023-12-29 | 2024-02-02 | 成都联帮微波通信工程有限公司 | Up-down conversion implementation method based on absorption filter and filter |
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