CN116054772B - Wide common mode rejection balanced band-pass filter - Google Patents
Wide common mode rejection balanced band-pass filter Download PDFInfo
- Publication number
- CN116054772B CN116054772B CN202310167156.8A CN202310167156A CN116054772B CN 116054772 B CN116054772 B CN 116054772B CN 202310167156 A CN202310167156 A CN 202310167156A CN 116054772 B CN116054772 B CN 116054772B
- Authority
- CN
- China
- Prior art keywords
- capacitor
- inductor
- series
- parallel
- balanced
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 92
- 238000004891 communication Methods 0.000 abstract description 9
- 230000010354 integration Effects 0.000 abstract description 5
- 230000001629 suppression Effects 0.000 abstract description 5
- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000004044 response Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- 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
- H03H7/42—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns
- H03H7/425—Balance-balance networks
- H03H7/427—Common-mode filters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Filters And Equalizers (AREA)
Abstract
The invention discloses a wide common mode rejection balanced band-pass filter, wherein a pair of balanced input ports P1/P1 'are led out from a first series-parallel resonance circuit, a pair of balanced output ports P2/P2' are led out from a second series-parallel resonance circuit, two groups of differential input/output port networks are formed, a differential mode passband is formed, and four resonance points are formed by adjusting lumped element parameters in two series-parallel resonance circuit structures; and connecting the two groups of series-parallel resonant circuits in series and then connecting the series-parallel resonant circuits in parallel to form a transmission zero point. The invention realizes the excellent performances of simple structure, easy integration, broadband common mode suppression, high frequency selectivity and ultra-wide high stop band suppression, and is an important radio frequency passive device which is favorable for improving the stability of a radio frequency system and the communication performance of a radio frequency front end.
Description
Technical Field
The invention relates to a band-pass filter, in particular to a wide common mode rejection balanced band-pass filter.
Background
With the rapid development of communication technology, a filter as a frequency selective device plays a vital role in facing increasingly crowded and abnormally complex electromagnetic environments. The filter has wide application in various microwave communication systems, electronic countermeasure systems and radar systems, can reduce the attenuation of signals in the working frequency band and can inhibit the interference of signals outside the working frequency band, and the performance of the filter directly influences the microwave transmission performance of the whole communication system. It can be said that, among the modern types of communication systems, microwave filters are the most critical and important microwave passive components for a complete communication system.
The microwave filter generally comprises two ports, can combine and separate spectrum resources, and can enable microwave signals required by the system to pass through without loss and distortion in the passband range. In an actual communication system, as the electromagnetic environment of communication becomes more and more complex, circuit noise signals, environmental noise signals and the like cause interference to microwave signals received by the system. Therefore, the balanced circuit with the common mode signal suppression function is widely applied to the microwave filter, and then the four-port balanced filter is formed.
In recent years, various research institutions have proposed a series of balanced filters that achieve better noise immunity and a more compact system architecture. The common balanced filter mainly has a structure based on a half-wavelength branch transmission line structure, a coupling resonator with staggered passband, a structure based on a dual-path signal interference structure, a structure based on microstrip-slot line conversion, a structure based on a special coupling line and the like, so that the size is larger, the integration level is lower, and due to the periodical change of an insertion loss phase, a high-order mode exists outside an operating frequency band, and the common-mode signal suppression and high-stop-band suppression bandwidth and the like are defects.
The balanced filter loaded by the lumped element has the advantages of compact structure, easy integration and the like. The differential filter based on lumped elements is recently reported, the lumped parameter balanced filter which is rarely reported at present mainly adopts a plurality of T-shaped circuit structures, cross-shaped circuit structures and series-parallel capacitor structures, the number of components is large, the common mode rejection bandwidth is narrow, the frequency selectivity of part of design is poor, and the problems of complexity and complexity of high-order modes and structures exist.
Disclosure of Invention
The invention aims to: aiming at the prior art, the wide common mode rejection balanced band-pass filter is provided, has high frequency selectivity and ultra-wide high stop band rejection based on lumped elements, and has simple structure, and is easy to integrate and miniaturize.
The technical scheme is as follows: a wide common mode rejection balanced band-pass filter comprises a pair of balanced input ports P1/P1', a pair of balanced output ports P2/P2', two series-parallel resonator circuits distributed in upper and lower mirror images, and a series-parallel resonator circuit;
a pair of balanced input ports P1/P1 'are led out from the first series-parallel resonance circuit, a pair of balanced output ports P2/P2' are led out from the second series-parallel resonance circuit to form two groups of differential input/output port networks, a differential mode passband is formed, and four resonance points are formed by adjusting lumped element parameters in the two series-parallel resonance circuit structures; and connecting the two groups of series-parallel resonant circuits in series and then connecting the series-parallel resonant circuits in parallel to form a transmission zero point.
Further, the first series-parallel resonant circuit comprises first to fourth inductors, first to sixth capacitors and a grounding structure, wherein the third inductor, the fourth inductor, the first capacitor and the second inductor are sequentially connected end to end, the other end of the third inductor is connected with one end of the sixth capacitor, and the other end of the sixth capacitor is led out of the balanced input port P1; a fourth capacitor is connected in parallel between the third inductor and the fourth inductor, and the other end of the fourth capacitor is grounded; a second capacitor is connected in parallel between the fourth inductor and the first inductor, and a balanced input port P1' is led out from the other end of the second capacitor; a second capacitor is connected in parallel between the first inductor and the first capacitor, and the other end of the second capacitor is grounded; a third capacitor is connected in parallel between the first capacitor and the second inductor, and the other end of the third capacitor is grounded.
Further, the second series-parallel resonant circuit is formed by mirroring the first series-parallel resonant circuit in an up-down symmetry mode, the second series-parallel resonant circuit comprises fifth to eighth inductors, seventh to twelfth capacitors and a grounding structure, wherein the seventh inductor, the eighth inductor, the fifth inductor, the seventh capacitor and the sixth inductor are sequentially connected end to end, the other end of the seventh inductor is connected with one end of an eleventh capacitor 603, and a balanced output port P2 is led out from the other end of the eleventh capacitor; a tenth capacitor is connected in parallel between the seventh inductor and the eighth inductor, and the other end of the tenth capacitor is grounded; a twelfth capacitor is connected in parallel between the eighth inductor and the fifth inductor, and a balanced output port P2' is led out from the other end of the twelfth capacitor; an eighth capacitor is connected in parallel between the fifth inductor and the seventh capacitor, and the other end of the eighth capacitor is grounded; a ninth capacitor is connected in parallel between the seventh capacitor and the sixth inductor, and the other end of the ninth capacitor is grounded.
Further, the series resonance circuit is formed by connecting a ninth inductor and a thirteenth capacitor in series, and the other end of the thirteenth capacitor is grounded; and connecting the other end of the second inductor in the first series-parallel resonant circuit with the other end of the sixth inductor in the second series-parallel resonant circuit, and connecting the series resonant circuit at the connecting position, namely connecting the series resonant circuit with the other end of the ninth inductor in the series resonant circuit, so as to form a complete wide common mode rejection balanced band-pass filter circuit structure.
The beneficial effects are that: the existing balanced microwave filter has the problems of complex structure, large volume, poor frequency selectivity, narrow common mode rejection bandwidth, high-order mode and the like. The lumped parameter balanced filter with few reports has the problems of large quantity of lumped elements, complex structure, poor common mode rejection and the like. The invention designs the lumped element wide common mode rejection balanced band-pass filter, which has the advantages of simple structure, easy integration, wide band common mode rejection, high frequency selectivity and ultra-wide high stop band rejection, and is an important radio frequency passive device which is beneficial to improving the stability of a radio frequency system and the communication performance of a radio frequency front end. Specific:
1. the invention adopts the lumped element to construct the wide common mode rejection and high frequency selectivity band-pass filter, and utilizes the lumped parameter to destroy the phase periodicity of the insertion loss signal, thereby realizing the ultra-wide high stop band rejection characteristic.
2. One end of the capacitors 601 and 602 in the first series-parallel resonant circuit is led out of a pair of balanced input ports P1/P1', and one end of the capacitors 601 and 602 in the second series-parallel resonant circuit is led out of a pair of balanced output ports P2/P2', so that two groups of differential input/output port networks are formed, a differential mode passband is formed, and common mode signals are effectively suppressed.
3. The two groups of series-parallel resonant circuits are connected in series to form four reflection poles, so that the utilization rate of lumped elements of the balanced filter is improved, and the number of elements required by each-order filtering power division response is reduced.
4. A series resonator circuit structure is connected in parallel at the joint of the two groups of series-parallel resonant circuits to form a transmission zero point, so that stronger frequency selection characteristic is realized.
Drawings
FIG. 1 is a block diagram of a wide common mode rejection balanced bandpass filter circuit of the invention;
FIG. 2 is a schematic diagram of parameters of a wide common mode rejection balanced band-pass filter according to the present invention;
FIG. 3 shows the differential mode signal reflection coefficient S in the embodiment dd11 And transmission coefficient S dd21 A plot of frequency response;
FIG. 4 shows common mode signal transmission coefficient S in the embodiment cc21 Graph of frequency response.
Detailed Description
The invention is further explained below with reference to the drawings.
A wide common mode rejection balanced band-pass filter based on lumped elements suitable for a radio frequency front-end system, as shown in figure 1, comprises a pair of balanced input ports P1/P1', a pair of balanced output ports P2/P2', two series-parallel resonator circuits distributed in an up-down mirror image mode, and a series-parallel resonator circuit.
The first series-parallel resonance circuit positioned above is composed of an inductor 101, 102, 301, 302, a capacitor 103, 104, 105, 303, 602, 601 and a grounding structure, wherein the inductor 301, the inductor 302, the inductor 101, the capacitor 103 and the inductor 102 are connected end to end in sequence, the other end of the inductor 301 is connected with one end of the capacitor 601, and the other end of the capacitor 601 is led out of a balanced input port P1; a capacitor 303 is connected in parallel between the inductor 301 and the inductor 302, and the other end of the capacitor 303 is grounded; a capacitor 602 is connected in parallel between the inductor 302 and the inductor 101, and a balanced input port P1' is led out from the other end of the capacitor 602; a capacitor 104 is connected in parallel between the inductor 101 and the capacitor 103, and the other end of the capacitor 104 is grounded; a capacitor 105 is connected in parallel between the capacitor 103 and the inductor 102, and the other end of the capacitor 105 is grounded.
The second series-parallel resonant circuit positioned below is formed by mirroring the first series-parallel resonant circuit up and down symmetrically, the second series-parallel resonant circuit consists of inductors 201, 202, 401, 402, capacitors 203, 204, 205, 403, 603 and 604 and a grounding structure, wherein the inductor 401, the inductor 402, the inductor 201, the capacitor 203 and the inductor 202 are connected end to end in sequence, the other end of the inductor 401 is connected with one end of the capacitor 603, and the other end of the capacitor 603 is led out of a balanced output port P2; a capacitor 403 is connected in parallel between the inductor 401 and the inductor 402, and the other end of the capacitor 403 is grounded; a capacitor 604 is connected in parallel between the inductor 402 and the inductor 201, and the other end of the capacitor 604 is led out of a balanced output port P2'; a capacitor 204 is connected in parallel between the inductor 201 and the capacitor 203, and the other end of the capacitor 204 is grounded; a capacitor 205 is connected in parallel between the capacitor 203 and the inductor 202, and the other end of the capacitor 205 is grounded.
The series resonant circuit is formed by connecting an inductor 501 and a capacitor 502 in series, and the other end of the capacitor 502 is grounded.
The other end of the inductor 102 in the first series-parallel resonant circuit is connected with the other end of the inductor 202 in the second series-parallel resonant circuit, and the series resonant circuit is connected in parallel at the connection position, namely the other end of the inductor 501 in the series resonant circuit, so that a complete wide common mode rejection balanced band-pass filter circuit structure is formed.
As shown in fig. 2, the circuit parameter diagram of the wide common mode rejection balanced band-pass filter of the present invention is shown, when the differential mode signal with equal amplitude and opposite phase is input into the circuit from the port P1/P1', the parameter values in the inductors 301 and 302 and the capacitors 303, 601 and 602 are adjusted, so that the signals at two ends of the port P1/P1' are in phase, the differential signal is transmitted to the output of the port P2/P2' through the first series-parallel resonant circuit structure, the series resonator and the second series-parallel resonant circuit structure, wherein four resonance points are formed by adjusting the lumped element parameters in the two series-parallel resonant circuit structures, and the series resonant structure generates a transmission zero point in the low frequency band, so as to form better frequency selective characteristics. When common mode signals with equal amplitude and same phase are input into the circuit from the port P1/P1', the signals at two ends of the port P1/P1' are opposite in phase, and the common mode signals cancel each other, so that good common mode rejection is formed. The performances of high frequency selectivity, broadband common mode rejection, broadband high stop band rejection and the like can be realized by reasonably selecting parameter values of all lumped elements, and the lumped elements have fewer numbers and simple structure.
The invention designs the wide common mode rejection lumped element balanced band-pass filter, which has the advantages of simple structure, easy integration, wide band common mode rejection, high frequency selectivity, ultra-wide high stop band rejection and the like, improves the utilization rate of lumped elements of the balanced filter, and reduces the number of elements required by each-order filter response. In order to better illustrate the technical effect of the invention, the embodiment designs a wide common mode rejection lumped element balanced band-pass filter with the center frequency of 2GHz, and performs optimization simulation verification, wherein the specific parameters are as follows: l1=9.4nh, c1=0.48 pF, c2=0.11 pF, l2=4.53 nh, c3=2.75 nh, l3=2.75 nh, c4=5.4 pF, c5=1.976 pF. Other frequency band circuits may be available for adjustment of the parameter values in this embodiment.
FIG. 3 shows the reflection coefficient S of the differential mode signal obtained by simulation in this embodiment dd11 And transmission coefficient S dd21 Graph of frequency response. As can be seen from the figure, the reflection coefficient S is within the range of 1.848-2.227 GHz during the differential mode operation dd11 All can be smaller than-20 dB, and has four reflection poles, and a transmission zero is generated at 1.31 GHz; within the stop band range of 0-1.693GHz, the transmission coefficient S dd21 Less than-20 dB, and a high-frequency stop band transmission coefficient S dd21 A frequency range of less than-20 dB of greater than 10f 0 ，f 0 The frequency selective filter is a working center frequency, and has strong frequency selective characteristics and broadband high stop band characteristics.
FIG. 4 shows the common mode signal transmission coefficient S obtained by simulation in the present embodiment cc21 Graph of frequency response. The graph shows that when the common mode works, the common mode rejection can reach 23.2dB within the range of 0-20GHz, and two common mode transmission zero points are respectively generated at the frequency points of 1.31GHz and 2.23GHz, so that the ultra-wide common mode rejection characteristic is realized.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (3)
1. The wide common mode rejection balanced band-pass filter is characterized by comprising a pair of balanced input ports P1/P1', a pair of balanced output ports P2/P2', two series-parallel resonator circuits distributed in upper and lower mirror images and a series-parallel resonator circuit;
a pair of balanced input ports P1/P1 'are led out from the first series-parallel resonance circuit, a pair of balanced output ports P2/P2' are led out from the second series-parallel resonance circuit to form two groups of differential input/output port networks, a differential mode passband is formed, and four resonance points are formed by adjusting lumped element parameters in the two series-parallel resonance circuit structures; connecting two groups of series-parallel resonant circuits in series, and connecting the series-parallel resonant circuits at the connecting position in parallel to form a transmission zero point;
the first series-parallel resonant circuit comprises first to fourth inductors (101, 102, 301 and 302), first to sixth capacitors (103, 104, 105, 303, 602 and 601) and a grounding structure, wherein the third inductor (301), the fourth inductor (302), the first inductor (101), the first capacitor (103) and the second inductor (102) are sequentially connected end to end, the other end of the third inductor (301) is connected with one end of the sixth capacitor (601), and the other end of the sixth capacitor (601) is led out of a balanced input port P1; a fourth capacitor (303) is connected in parallel between the third inductor (301) and the fourth inductor (302), and the other end of the fourth capacitor (303) is grounded; a fifth capacitor (602) is connected in parallel between the fourth inductor (302) and the first inductor (101), and a balanced input port P1' is led out from the other end of the fifth capacitor (602); a second capacitor (104) is connected in parallel between the first inductor (101) and the first capacitor (103), and the other end of the second capacitor (104) is grounded; a third capacitor (105) is connected in parallel between the first capacitor (103) and the second inductor (102), and the other end of the third capacitor (105) is grounded.
2. The wide common mode rejection balanced bandpass filter according to claim 1, characterized in that the second series-parallel resonant circuit is mirrored up and down from the first series-parallel resonant circuit, the second series-parallel resonant circuit comprising fifth to eighth inductors (201, 202, 401, 402), seventh to twelfth capacitors (203, 204, 205, 403, 603, 604) and a ground structure, wherein the seventh inductor (401), eighth inductor (402), fifth inductor (201), seventh capacitor (203) and sixth inductor (202) are connected end to end in this order, the other end of the seventh inductor (401) is connected to one end of the eleventh capacitor 603, and the other end of the eleventh capacitor (603) leads out the balanced output port P2; a tenth capacitor (403) is connected in parallel between the seventh inductor (401) and the eighth inductor (402), and the other end of the tenth capacitor (403) is grounded; a twelfth capacitor (604) is connected in parallel between the eighth inductor (402) and the fifth inductor (201), and the balance type output port P2' is led out from the other end of the twelfth capacitor (604); an eighth capacitor (204) is connected in parallel between the fifth inductor (201) and the seventh capacitor (203), and the other end of the eighth capacitor (204) is grounded; a ninth capacitor (205) is connected in parallel between the seventh capacitor (203) and the sixth inductor (202), and the other end of the ninth capacitor (205) is grounded.
3. The wide common mode rejection balanced bandpass filter according to claim 2, characterized in that the series resonant circuit is formed by a ninth inductance (501) and a thirteenth capacitance (502) in series, the other end of the thirteenth capacitance (502) being grounded; the other end of the second inductor (102) in the first series-parallel resonance circuit is connected with the other end of the sixth inductor (202) in the second series-parallel resonance circuit and is connected with the other end of the ninth inductor (501) in the series resonance circuit, so that a complete wide common mode rejection balanced band-pass filter circuit structure is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310167156.8A CN116054772B (en) | 2023-02-27 | 2023-02-27 | Wide common mode rejection balanced band-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310167156.8A CN116054772B (en) | 2023-02-27 | 2023-02-27 | Wide common mode rejection balanced band-pass filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116054772A CN116054772A (en) | 2023-05-02 |
| CN116054772B true CN116054772B (en) | 2023-08-04 |
Family
ID=86123820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310167156.8A Active CN116054772B (en) | 2023-02-27 | 2023-02-27 | Wide common mode rejection balanced band-pass filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116054772B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116800219B (en) * | 2023-07-20 | 2024-03-19 | 南通至晟微电子技术有限公司 | Frequency-adjustable balance to single-ended filtering power divider |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007267264A (en) * | 2006-03-29 | 2007-10-11 | Tdk Corp | Lumped-constant bandpass filter |
| CN104466328A (en) * | 2014-11-28 | 2015-03-25 | 南通大学 | Balanced-unbalanced filter-divider |
| CN110492861A (en) * | 2019-08-15 | 2019-11-22 | 中国电子科技集团公司第五十五研究所 | Novel GHz ultra wide band common mode noise rejection circuit topological structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6922117B2 (en) * | 2002-05-07 | 2005-07-26 | Agilent Technologies, Inc. | Lumped element transmission line frequency multiplexer |
-
2023
- 2023-02-27 CN CN202310167156.8A patent/CN116054772B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007267264A (en) * | 2006-03-29 | 2007-10-11 | Tdk Corp | Lumped-constant bandpass filter |
| CN104466328A (en) * | 2014-11-28 | 2015-03-25 | 南通大学 | Balanced-unbalanced filter-divider |
| CN110492861A (en) * | 2019-08-15 | 2019-11-22 | 中国电子科技集团公司第五十五研究所 | Novel GHz ultra wide band common mode noise rejection circuit topological structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116054772A (en) | 2023-05-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5905418A (en) | Surface-acoustic-wave filters with poles of attenuation created by impedance circuits | |
| CN109713407B (en) | Ladder-shaped structure duplexer and method for improving isolation of duplexer | |
| CN109831176A (en) | A kind of piezoelectric acoustic-wave filter and duplexer | |
| CN116054772B (en) | Wide common mode rejection balanced band-pass filter | |
| CN103117427A (en) | Wideband mini low temperature co-fired ceramic balance filter | |
| CN109088134B (en) | Microstrip band-pass filter | |
| CN212517462U (en) | Tuning duplexer, radio frequency circuit and communication equipment | |
| CN110089032A (en) | Filter and method for adjusting performance of filter | |
| US6958663B2 (en) | In-band group delay equalizer and distortion compensation amplifier | |
| CN114497936B (en) | Lumped element differential broadband band-pass filter | |
| CN216390937U (en) | WIFI6E band-pass filter, related equipment and chip | |
| CN109786905A (en) | Strip line low-pass filter | |
| CN114337594A (en) | Filter circuit and duplexer | |
| CN209787130U (en) | High-power band-pass filter | |
| CN114421925A (en) | Filter and duplexer | |
| JPH07231241A (en) | Surface acoustic wave device | |
| CN112072241A (en) | Tuning duplexer, radio frequency circuit and communication equipment | |
| CN104078727B (en) | Tandem type one side elliptic function line filter | |
| US11929725B2 (en) | Bandpass filter circuit and multiplexer | |
| CN218275018U (en) | Miniaturized narrow-band filter | |
| CN112397858B (en) | Ultrashort wave quadruplex ware | |
| CN216488426U (en) | Miniaturized high-performance duplexer | |
| CN115347910B (en) | Method for adjusting multiplexer circuit, multiplexer and communication equipment | |
| US20230198493A1 (en) | Composite acoustic wave filter device | |
| US20220345109A1 (en) | Band-stop filter and multi-frequency band-stop filter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |