CN210092303U

CN210092303U - Small dual-passband filter based on open-circuit branch loading square-ring resonator

Info

Publication number: CN210092303U
Application number: CN201921086243.6U
Authority: CN
Inventors: 姬五胜; 张志悦; 童荥贇
Original assignee: Tianjin University of Technology and Education China Vocational Training Instructor Training Center
Current assignee: Tianjin University of Technology and Education China Vocational Training Instructor Training Center
Priority date: 2019-07-12
Filing date: 2019-07-12
Publication date: 2020-02-18
Anticipated expiration: 2029-07-12

Abstract

The utility model relates to a small-size dual passband filter based on branch and knot loading square ring syntonizer opens a way, its constitution includes: two layers of RO4003C dielectric substrates, top and bottom microstrip structures and a middle layer are etched with ground planes of 6 square slots. The top layer consists of a microstrip feeder line loaded with an open-circuit branch and an open-circuit branch loaded square ring resonator (OSLSRR) loaded with an open-circuit branch and a square ring branch in the middle of the uniform impedance resonator, so that the dual-passband characteristic can be realized; in order to achieve miniaturization of the filter, the uniform impedance resonator is folded in the shape of a Split Ring Resonator (SRR). To achieve high out-of-band rejection, the middle common ground plane is etched with 6 square slots. The bottom layer is two Square Ring Loaded Resonators (SRLR). The utility model discloses a circuit has dual passband and miniaturized filtering effect to good passband selectivity can has been embodied.

Description

Small dual-passband filter based on open-circuit branch loading square-ring resonator

Technical Field

The utility model relates to aA small dual-passband filter based on an open-circuit stub loaded square-ring resonator. The center frequencies of the two pass bands of the filter are respectively as follows: 4.2GHz, 5.9GHz, with fractional bandwidths of 14.28%, 10.17%, respectively; insertion loss S of filter₂₁And 5 transmission zeros exist, and the out-of-band rejection is better.

Background

With the rapid development of communication systems, more and more communication devices need to support the operation of two or more communication systems at the same time, which requires that the rf front end can simultaneously handle the signal transmission and signal separation of multiple frequency bands. The development of dual band technology has become an urgent requirement for the development of communication systems. With the rapid development of mobile communications and the high integration of microwave circuits, filters, which are key components of communication systems, are also required to be highly functional and compact.

Disclosure of Invention

The utility model discloses a small-size dual passband filter based on branch and node loading square ring syntonizer of opening a way (OSLSRR). The center frequencies of the two pass bands of the filter are respectively as follows: 4.2GHz, 5.9GHz, with a fractional bandwidth of 14.28%, 10.17%; return loss S₁₁Better than-18.87 dB and-12.78 dB respectively, and the insertion loss S in the pass band₂₁Respectively-0.57 dB and-0.66 dB; the 10GHz in-band out-of-band rejection is better than-20 dB, and good frequency selection characteristics can be realized.

In order to realize the above design purpose, the utility model discloses a technical scheme as follows:

a small-size dual-passband filter based on open circuit branch knot loading square ring resonators is characterized in that: the circuit comprises two layers of dielectric substrates and three layers of metal boundaries, wherein the two layers of dielectric substrates are made of RO4003C materials, and the thicknesses of the two layers of dielectric substrates are 0.508 mm; the top layer is electrically coupled by a microstrip feeder line which is laid by a microstrip patch and is loaded with open-circuit branches and two open-circuit branch loading square ring resonators in the shape of open rings; the middle layer is a common ground plane etched with 6 square grooves; the bottom layer is two square ring loading resonators with the same size for magnetic coupling.

The small dual-passband filter based on the open-circuit branch loaded square-ring resonator is characterized in that: the microstrip feeder line which is laid by the microstrip patch and is loaded with the open-circuit branch is an open-circuit branch microstrip line with a narrow width loaded at 5/6 of the input and output feeder line.

The small dual-passband filter based on the open-circuit branch loaded square-ring resonator is characterized in that: the open-branch-loaded square-ring resonator (102) in the shape of a first split ring is formed by loading an open-branch and a square-ring branch in the middle of a uniform impedance resonator, and the uniform impedance resonator is folded into an open ring.

The small dual-passband filter based on the open-circuit branch loaded square-ring resonator is characterized in that: the middle layer (3) is formed by etching 6 square grooves on a middle ground plane, wherein a first groove (301) and a second groove (302) are opposite to the central positions of microstrip lines in the horizontal direction of the open-circuit branch-knot loaded square-ring resonator (102) in the first open-loop ring shape of the top layer (1) and the first square-ring loaded resonator (501) of the bottom layer (5) in the vertical direction; the fifth groove (305) and the sixth groove (306) are opposite to the central positions of the microstrip lines in the horizontal direction of the open-circuit branch knot loading square ring resonator (103) in the second open-loop shape of the top layer (1) and the second square ring loading resonator (502) of the bottom layer (5) in the vertical direction; the third groove (303) is vertically opposite to the middle position of a microstrip line vertically running to the right of the open-circuit branch knot loaded square ring resonator (102) in the first open-loop shape of the top layer (1) and the square ring loaded by the first square ring loaded resonator (501) of the bottom layer (5); the fourth slot (304) is opposite to the middle position of the square ring loaded by the open-circuit branch knot loaded square ring resonator (103) in the shape of the second open ring of the top layer (1) and the square ring loaded by the second square ring loaded resonator (502) of the bottom layer (5) in the vertical direction and going to the left microstrip line.

The small dual-passband filter based on the open-circuit branch loaded square-ring resonator is characterized in that: the square ring loading resonator is formed by loading square ring branches on the uniform impedance resonator, and the uniform impedance resonator is folded into a split ring shape.

The utility model has the advantages that: circuit producing dual passband filterThe wave effect, and the miniaturization and high out-of-band rejection of the filter are realized. The center frequencies of the two pass bands are 4.2GHz and 5.9GHz, and the corresponding fractional bandwidths are 14.28% and 10.17% respectively; return loss S₁₁Better than-18.87 dB and-12.78 dB respectively, and the insertion loss S in the pass band₂₁Respectively-0.57 dB and-0.66 dB. The characteristic impedance of the input and output ports of the circuit is standard 50 omega, and the central frequencies of two pass bands of the filter can be adjusted by adjusting the size of the uniform impedance microstrip line, the size of the middle loading open-circuit branch of the uniform impedance resonator and the size of the square ring branch. The overall size of the circuit is 26.3mm multiplied by 18.3mm multiplied by 1.016mm, and the structure of the microwave filter is more compact compared with other microwave filter structures.

Drawings

Fig. 1 is the utility model relates to a three-dimensional structure chart of small-size dual-passband filter based on branch and node loading square ring syntonizer opens a way.

Fig. 2 is the utility model relates to a small-size dual band filter top layer structure picture based on branch and knot loading square ring syntonizer opens a way.

Fig. 3 is the utility model relates to a small-size dual-passband filter's intermediate level structure chart based on branch and node loading square ring syntonizer opens a way.

Fig. 4 is the utility model discloses a small-size dual-passband filter's chart of bottom based on branch and knot loading square ring syntonizer opens a way.

Fig. 5 is the utility model relates to a small-size dual band filter S parameter' S simulation result based on branch and knot loading square ring syntonizer opens a way.

Detailed Description

The present invention will be described in further detail with reference to the following examples and accompanying drawings.

As shown in fig. 1, the structure of the small dual-passband filter based on the open-circuit branch-node loaded square-ring resonator of the present invention includes a top structure diagram 1 shown in fig. 2, a middle structure diagram 3 shown in fig. 3, a bottom structure diagram 5 shown in fig. 4, and middle

dielectric layers

2 and 4. The top layer 1 of the circuit is electrically coupled by a microstrip feeder line which is laid by a microstrip patch and is loaded with open-circuit branches and an open-circuit branch loading square ring resonator (OSLSRR) in the shape of two open rings; the middle layer 3 is a common ground plane, in order to introduce cross coupling, generate transmission zero points and realize high out-of-band rejection, and 6 square grooves are etched in the common ground plane; the bottom layer 5 is magnetically coupled for two Square Ring Loaded Resonators (SRLR) of equal size. The intermediate

dielectric layers

2 and 4 are made of Rogers4003C, the dielectric constant is 3.55, the loss tangent is 0.0029, and the thickness h =0.508 mm. The length, width and height of the filter are 26.3mm multiplied by 18.3mm multiplied by 1.016 mm.

As shown in fig. 2, the utility model relates to a small-size dual-passband filter's top layer structure chart based on branch and knot loading square ring syntonizer opens a way. The input microstrip feeder line 101 loaded with the open-circuit branch knot and the output microstrip feeder line 104 loaded with the open-circuit branch knot have symmetrical structures, same size and widthw ₁Length of =1.15mml ₁=6mm, width of open-circuit branchw ₅Length of =0.3mml ₇=3.5 mm; the open-circuit branch-knot loading square-ring resonator 102 in the first open-circuit ring shape of the top layer and the open-circuit branch-knot loading square-ring resonator 103 in the second open-circuit ring shape of the top layer are symmetrical in structure and identical in size, and the sizes of the open-circuit branch-knot loading square-ring resonators are as follows:w ₂=0.5mm，w ₃=0.3mm，w ₄=1.1mm，w ₆=0.6mm；l ₂=7mm，l ₃=7mm，l ₄=4.5mm，l ₅=5.2mm，l ₆=3mm。

as shown in fig. 3, the utility model relates to a small-size dual-passband filter's intermediate level structure chart based on branch and node loading square ring syntonizer opens a way. 6 square grooves are etched on the ground surface, which respectively comprises the following steps: the first square groove 301 and the second square groove 302 are the same in size, and the size is e =1.2 mm; the third square groove 303 and the fourth square groove 304 have the same size, and the size of the third square groove is s =0.6 mm; the fifth square groove 305 is the same size as the sixth square groove 306, with the size k =0.7 mm.

As shown in fig. 4, the present invention relates to a bottom structure diagram of a small dual-passband filter based on an open-circuit stub loaded square-ring resonator. The first square ring loaded resonator 501 at the bottom layer and the second square ring loaded resonator 502 at the bottom layer have symmetrical structures and the same sizew ₂=0.5mm，w ₃=0.3mm，w ₆=0.6mm；l ₂=7mm，l ₃=7mm，l ₄=4.5mm，l ₅=5.2mm。

As shown in fig. 5, the utility model relates to a simulation result of small-size dual passband filter S parameter based on branch and knot loading square ring syntonizer opens a way. It can be known that the center frequencies of the two passbands of the filter are respectively: 4.2GHz, 5.9GHz, with a fractional bandwidth of 14.28%, 10.17%; return loss S₁₁Better than-18.87 dB and-12.78 dB respectively, and the insertion loss S in the pass band₂₁Respectively-0.57 dB and-0.66 dB; the out-of-band rejection in 10GHz is better than-20 dB, and the good passband selection performance is embodied.

The above description is only for the specific embodiments of the present invention, and the protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims

1. A small-size dual-passband filter based on open circuit branch knot loading square ring resonators is characterized in that: the circuit comprises two layers of dielectric substrates and three layers of metal boundaries, wherein the two layers of dielectric substrates are made of RO4003C materials, and the thicknesses of the two layers of dielectric substrates are 0.508 mm; the top layer (1) is electrically coupled by a microstrip feeder line which is laid by a microstrip patch and is loaded with open-circuit branches and two open-loop-shaped open-circuit branch loaded square-ring resonators; the middle layer (3) is a common grounding surface etched with 6 square grooves; the bottom layer (5) is used for carrying out magnetic coupling on two square ring loading resonators with the same size.

2. The small-sized double-passband filter based on the open-stub-loaded square-ring resonator as claimed in claim 1, wherein: the microstrip feeder (101) which is laid by the microstrip patch and is loaded with the open-circuit branch is an open-circuit branch microstrip line with a narrow width loaded at the position 5/6 of the input and output feeder.

3. The small-sized double-passband filter based on the open-stub-loaded square-ring resonator as claimed in claim 1, wherein: the open-branch-loaded square-ring resonator (102) in the shape of a first split ring is formed by loading an open-branch and a square-ring branch in the middle of a uniform impedance resonator, and the uniform impedance resonator is folded into an open ring.

4. The small-sized double-passband filter based on the open-stub-loaded square-ring resonator as claimed in claim 1, wherein: the middle layer (3) is formed by etching 6 square grooves on a middle ground plane, wherein a first groove (301) and a second groove (302) are opposite to the central positions of microstrip lines in the horizontal direction of the open-circuit branch-knot loaded square-ring resonator (102) in the first open-loop ring shape of the top layer (1) and the first square-ring loaded resonator (501) of the bottom layer (5) in the vertical direction; the fifth groove (305) and the sixth groove (306) are opposite to the central positions of the microstrip lines in the horizontal direction of the open-circuit branch knot loading square ring resonator (103) in the second open-loop shape of the top layer (1) and the second square ring loading resonator (502) of the bottom layer (5) in the vertical direction; the third groove (303) is vertically opposite to the middle position of a microstrip line vertically running to the right of the open-circuit branch knot loaded square ring resonator (102) in the first open-loop shape of the top layer (1) and the square ring loaded by the first square ring loaded resonator (501) of the bottom layer (5); the fourth slot (304) is opposite to the middle position of the square ring loaded by the open-circuit branch knot loaded square ring resonator (103) in the shape of the second open ring of the top layer (1) and the square ring loaded by the second square ring loaded resonator (502) of the bottom layer (5) in the vertical direction and going to the left microstrip line.

5. The small-sized double-passband filter based on the open-stub-loaded square-ring resonator as claimed in claim 1, wherein: the square ring loading resonator is formed by loading square ring branches on the uniform impedance resonator, and the uniform impedance resonator is folded into a split ring shape.