CN115425377A - Double-passband balance filter based on square ring loading - Google Patents
Double-passband balance filter based on square ring loading Download PDFInfo
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- CN115425377A CN115425377A CN202211202110.7A CN202211202110A CN115425377A CN 115425377 A CN115425377 A CN 115425377A CN 202211202110 A CN202211202110 A CN 202211202110A CN 115425377 A CN115425377 A CN 115425377A
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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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20309—Strip line filters with dielectric resonator
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
- H01P5/184—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being strip lines or microstrips
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/08—Strip line resonators
- H01P7/082—Microstripline resonators
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- 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
Abstract
The utility model provides a dual-passband balance filter based on square ring loading, includes the dielectric substrate, and one side of dielectric substrate is equipped with the microstrip line, and the microstrip line includes first input port, second input port, first output port, second output port and four mutual clearance coupling's ring resonator, and first input port, second input port, first output port and second output port are the rectangular array and arrange, and the both ends of ring resonator form the annular arm of an H shape respectively, and the one end that two annular arms kept away from each other is equipped with central loading minor matters respectively. The square ring loading-based ring resonator provided by the invention has a multimode characteristic, can be used for designing and realizing two pass bands, is simple and compact in design, has a symmetrical structure, is easy for high-order cascade, realizes flexible regulation and control of the bandwidth of the two pass bands through a gap between ring arms, an additional H-shaped coupling line and a coupling block, and finally meets the requirement of the two pass bands on an external quality factor through a coupling feeder line.
Description
Technical Field
The invention relates to the field of dual-passband filters, in particular to a dual-passband balance filter based on square ring loading.
Background
With the rapid development of wireless communication technology, frequency spectrum resources are increasingly in short supply, electromagnetic environments are increasingly complex, and application scenarios such as mobile communication, radar detection and electronic countermeasure face development requirements such as multiband, miniaturization and anti-interference. In order to solve the above challenges in communication systems, a balanced circuit has a stronger ability to resist environmental noise than a single-ended circuit, and in recent years, a miniaturized multi-passband balanced filter having excellent differential performance and noise interference resistance attracts many researchers' attention.
Compared with the conventional single-port unbalanced filter, in the design of the balanced filter, not only a good differential mode response but also sufficient common mode rejection characteristics are required to be realized, and particularly, for the balanced filter with multiple passbands, it is important to realize flexible control of the center frequency and bandwidth of each passband.
Disclosure of Invention
The invention aims to provide a dual-passband balance filter based on square ring loading, which has the characteristics of miniaturization, compact structure and good differential mode transmission and common mode rejection characteristics, and the central frequencies and bandwidths of two passbands can be flexibly regulated and controlled.
The technical scheme adopted by the invention for solving the technical problems is as follows: a dual-passband balance filter based on square ring loading comprises a dielectric substrate, wherein one side of the dielectric substrate is provided with a microstrip line, the microstrip line comprises a first input port, a second input port, a first output port, a second output port and four annular resonators which are in mutual gap coupling, the first input port, the second input port, the first output port and the second output port are arranged in a rectangular array, the first input port and the second input port are positioned on the same side of the rectangular array, the first output port and the second output port are positioned on the other side of the rectangular array, the first input port and the second input port, the first output port and the second output port are respectively and symmetrically arranged relative to a central line of the rectangular array, which extends along the X direction, and the first input port and the first output port, the second input port and the second output port are respectively and symmetrically arranged relative to the central line of the rectangular array, which extends along the Y direction;
the four ring resonators are sequentially arranged at intervals in the X direction, the middle parts of the ring resonators extend in the Y direction, two ends of each ring resonator in the Y direction form an H-shaped ring arm, the two ends of each H-shaped ring arm extend in the Y direction and are symmetrically arranged relative to a central line of each ring resonator extending in the Y direction, the two ring arms of the same ring resonator are symmetrically arranged relative to the central line of the rectangular array extending in the X direction, one ends, far away from each other, of the two ring arms are provided with central loading branches respectively, the central loading branches are located between the two ends of the H-shaped ring arms, and the central loading branches are rectangular and extend in the Y direction;
the first input port is connected with a first input feeder and a second input feeder, the second input port is connected with a third input feeder and a fourth input feeder, the first output port is connected with a first output feeder and a second output feeder, the second output port is connected with a third output feeder and a fourth output feeder, the first input feeder, the third input feeder, the first output feeder and the third output feeder are respectively in clearance coupling with one end of an H-shaped ring arm close to the first input port to realize feeding, and the second input feeder, the fourth input feeder, the second output feeder and the fourth output feeder are respectively in clearance coupling with the middle of the ring resonator close to the first input port to realize feeding.
Preferably, an H-shaped coupling line is arranged between two adjacent central loading branches of the second and third ring resonators arranged at intervals in the X-direction, and two ends of the H-shaped coupling line are respectively coupled with the two central loading branches through gaps to realize feeding.
Preferably, coupling blocks are arranged between adjacent annular arms of the first and second annular resonators and the third and fourth annular resonators which are arranged at intervals in the X direction, the coupling blocks are rectangular, and the coupling blocks are respectively coupled with the two annular arms through gaps to realize feeding.
According to the technical scheme, the invention has the beneficial effects that:
1. the ring resonator based on square ring loading has multimode characteristics, can be used for designing and realizing two pass bands, is simple and compact in design, has a symmetrical structure, and is easy for high-order cascading.
2. The center frequencies of the two pass bands of the dual-pass-band balance filter based on square ring loading can be flexibly regulated and controlled through the size of the annular arm and the size of the center loading branch, the flexible regulation and control of the bandwidth of the two pass bands are realized through the gap between the annular arms, the additional H-shaped coupling line and the coupling block, and finally the requirement of the two pass bands on the external quality factor is met through the coupling feeder line.
3. The dual-passband balance filter based on square ring loading has the advantages of miniaturization, compact structure, flexible design, high out-of-band rejection and passband spacing degree of differential mode response, good common mode response rejection characteristic and the like.
Drawings
FIG. 1 is a schematic view of the present invention;
fig. 2 is a schematic diagram of a microstrip line;
FIG. 3 is a schematic diagram of a ring resonator;
fig. 4 is a simulation graph of the present invention.
The mark in the figure is: 1. the microstrip line-feeding circuit comprises a dielectric substrate, 2, a microstrip line, 3, a first input port, 4, a second input port, 5, a first output port, 6, a second output port, 7, a first input feeder, 8, a second input feeder, 9, a fourth input feeder, 10, a third input feeder, 11, a first output feeder, 12, a second output feeder, 13, a fourth output feeder, 14, a third output feeder, 15, an annular arm, 16, a center loading branch, 17, an H-shaped coupling line, 18 and a coupling block.
Detailed Description
Referring to the drawings, the specific embodiments are as follows:
as shown in fig. 1, a dual-passband balance filter based on square ring loading includes a dielectric substrate 1, and a microstrip line 2 is disposed on one side of the dielectric substrate 1.
As shown in fig. 2, the microstrip line 2 includes a first input port 3, a second input port 4, a first output port 5, a second output port 6, and four ring resonators that are gap-coupled to each other. The first input port 3, the second input port 4, the first output port 5 and the second output port 6 are arranged in a rectangular array, the first input port 3 and the second input port 4 are located on the same side of the rectangular array, and the first output port 5 and the second output port 6 are located on the other side of the rectangular array.
As shown in fig. 2, the first input port 3 and the second input port 4, and the first output port 5 and the second output port 6 are respectively disposed symmetrically with respect to the center line of the rectangular array extending in the X direction, and the first input port 3 and the first output port 5, and the second input port 4 and the second output port 6 are respectively disposed symmetrically with respect to the center line of the rectangular array extending in the Y direction, so that characteristics of differential mode response and common mode rejection can be well achieved.
As shown in fig. 2-3, four ring resonators are sequentially arranged at intervals in the X direction, the middle portions of the ring resonators extend in the Y direction, two ends of each ring resonator in the Y direction form an H-shaped ring arm 15, two ends of each H-shaped ring arm 15 in the Y direction extend in the Y direction and are symmetrically arranged with respect to a center line of the ring resonators extending in the Y direction, and two ring arms 15 of the same ring resonator are symmetrically arranged with respect to a center line of the rectangular array extending in the X direction.
As shown in fig. 2-3, the ends of the two annular arms 15 away from each other are respectively provided with a central loading branch 16, the central loading branch 16 is located between the two ends of the H-shape of the annular arms 15, and the central loading branch 16 is rectangular extending along the Y-direction.
As shown in fig. 2 to 3, by synchronously adjusting the length of the H-shape of the plurality of annular arms 15L 2 The center frequencies of the two pass bands can be controlled simultaneously by adjusting the length of the center loading branch 16 along the Y directionL 1 And width in the X directionW 1 The center frequency of the second pass band can be independently controlled. That is, when designing the dual band filter, the total length of the H-shape of the loop arm 15 can be adjusted firstL 2 To determine the center frequency of the first pass band and then adjustL 1 AndW 1 and determining the center frequency of the second passband, thereby realizing flexible control of the center frequencies of the two passbands.
The dual-passband balance filter is a four-order Chebyshev-type filter, the four square-ring-loaded ring resonators are directly coupled through gaps, and the bandwidths of two passbands can be adjusted by adjusting the width of the gaps. In addition, as shown in fig. 2, an H-shaped coupling line 17 is arranged between two adjacent central loading branches 16 of the second and third ring resonators arranged at intervals in the X-direction, two ends of the H-shaped coupling line 17 are respectively coupled with the two central loading branches 16 through gaps to realize feeding, and the length of the H-shaped coupling line 17 in the Y-direction is adjustedL 3 The bandwidth of the second pass band can be independently controlled.
As shown in fig. 2, coupling blocks 18 are disposed between adjacent ring arms 15 of the first and second, and third and fourth ring resonators arranged at intervals in the X-direction, the coupling blocks 18 are rectangular, the coupling blocks 18 are respectively coupled with the two ring arms 15 through gaps to realize feeding, and the bandwidths of the two passbands can be finely adjusted by adjusting the length and width dimensions of the coupling blocks 18.
As shown in fig. 2, the first input port 3 is connected to a first input feeder 7 and a second input feeder 8, the second input port 4 is connected to a third input feeder 10 and a fourth input feeder 9, the first output port 5 is connected to a first output feeder 11 and a second output feeder 12, and the second output port 6 is connected to a third output feeder 14 and a fourth output feeder 13. The first input feeder 7, the third input feeder 10, the first output feeder 11 and the third output feeder 14 are respectively coupled with one end of the H shape of the annular arm 15 close to the first input feeder through gaps to realize feeding, and the second input feeder 8, the fourth input feeder 9, the second output feeder 12 and the fourth output feeder 13 are respectively coupled with the middle part of the annular resonator close to the second input feeder through gaps to realize feeding. By adjusting the lengths of the input feeder and the output feeder, flexible control of the quality factors outside the two pass bands can be achieved.
Fig. 4 illustrates a differential mode frequency simulation response of the dual-passband balance filter based on square ring loading according to the present invention, and the simulation results that the center frequencies of the two passbands are 5.4GHz and 6.3GHz, respectively, and the 3-dB relative bandwidths of the two passbands are 2.6% and 1.9%, respectively, to generate two transmission zeros TZ1 and TZ2, respectively, which are located at 4.98GHz and 5.76GHz, respectively.
Claims (3)
1. The utility model provides a dual passband balance filter based on square ring loading which characterized in that: the microstrip line array comprises a dielectric substrate (1), wherein one side of the dielectric substrate (1) is provided with a microstrip line (2), the microstrip line (2) comprises a first input port (3), a second input port (4), a first output port (5), a second output port (6) and four ring resonators which are mutually in gap coupling, the first input port (3), the second input port (4), the first output port (5) and the second output port (6) are arranged in a rectangular array, the first input port (3) and the second input port (4) are positioned on the same side of the rectangular array, the first output port (5) and the second output port (6) are positioned on the other side of the rectangular array, the first input port (3) and the second input port (4) and the first output port (5) and the second output port (6) are respectively and symmetrically arranged about a central line of the rectangular array, which extends along the X direction, and the first input port (3) and the first output port (5) and the second input port (4) and the second output port (6) are respectively and symmetrically arranged about the central line of the rectangular array, which extends along the Y direction;
the four ring resonators are sequentially arranged at intervals in the X direction, the middle parts of the ring resonators extend in the Y direction, two ends of each ring resonator in the Y direction form an H-shaped ring arm (15), two ends of each H-shaped ring arm (15) respectively extend in the Y direction and are symmetrically arranged relative to the center line of each ring resonator in the Y direction, two ring arms (15) of the same ring resonator are symmetrically arranged relative to the center line of the rectangular array in the X direction, central loading branches (16) are respectively arranged at the ends, far away from each other, of the two ring arms (15), the central loading branches (16) are located between the two ends of each H-shaped ring arm (15), and the central loading branches (16) are rectangular in shape and extend in the Y direction;
the first input port (3) is connected with a first input feeder (7) and a second input feeder (8), the second input port (4) is connected with a third input feeder (10) and a fourth input feeder (9), the first output port (5) is connected with a first output feeder (11) and a second output feeder (12), the second output port (6) is connected with a third output feeder (14) and a fourth output feeder (13), the first input feeder (7), the third input feeder (10), the first output feeder (11) and the third output feeder (14) are respectively in clearance coupling with one end of an H shape of an annular arm (15) close to the first input port to realize feeding, and the second input feeder (8), the fourth input feeder (9), the second output feeder (12) and the fourth output feeder (13) are respectively in clearance coupling with the middle of an annular resonator close to the first input port.
2. The dual-passband balance filter based on square-loop loading according to claim 1, wherein: h-shaped coupling lines (17) are arranged between two adjacent central loading branches (16) of the second and third ring resonators which are arranged at intervals along the X direction, and two ends of each H-shaped coupling line (17) are in gap coupling with the two central loading branches (16) respectively to realize feeding.
3. The dual-passband balance filter based on square-loop loading according to claim 2, wherein: coupling blocks (18) are arranged between adjacent annular arms (15) of the first annular resonator, the second annular resonator, the third annular resonator and the fourth annular resonator which are arranged at intervals in the X direction, the coupling blocks (18) are rectangular, and the coupling blocks (18) are respectively coupled with the two annular arms (15) through gaps to realize feeding.
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| CN202211202110.7A CN115425377B (en) | 2022-09-29 | 2022-09-29 | Double-passband balance filter based on loading of ring resonator |
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| CN202211202110.7A CN115425377B (en) | 2022-09-29 | 2022-09-29 | Double-passband balance filter based on loading of ring resonator |
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