WO2018171180A1 - Band-pass filter based on ring resonator - Google Patents
Band-pass filter based on ring resonator Download PDFInfo
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- WO2018171180A1 WO2018171180A1 PCT/CN2017/107193 CN2017107193W WO2018171180A1 WO 2018171180 A1 WO2018171180 A1 WO 2018171180A1 CN 2017107193 W CN2017107193 W CN 2017107193W WO 2018171180 A1 WO2018171180 A1 WO 2018171180A1
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- Prior art keywords
- microstrip line
- line
- coupled
- load
- ring resonator
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Classifications
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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
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
- H01P1/20381—Special shape resonators
-
- 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
Definitions
- the present invention relates to the field of radio frequency microwave communication technologies, and in particular, to a bandpass filter based on a ring resonator.
- the filter can filter out-of-band noise and improve the sensitivity of the circuit system.
- a microstrip filter is a device used to separate microwave signals of different frequencies. Its main function is to suppress unwanted signals so that they cannot pass through the filter and only pass the desired signal.
- the performance of the filter has a large impact on the performance of the circuit system. Due to the diversity of communication bands in modern communication systems, the selectivity of prior art bandpass filters is often insufficient to meet the diversity of communication bands and affect the performance of the entire communication system.
- An object of the present invention is to provide a band-pass filter based on a ring resonator, which aims to solve the technical problem of low selectivity of the conventional band-pass filter.
- the present invention provides a band-pass filter based on a ring resonator, comprising a dielectric plate, a ground metal layer disposed on a lower surface of the dielectric plate, and an input end etched on a surface of the dielectric plate, Output terminal, input microstrip line, output microstrip line, first coupling line, second coupling line, ring resonator, first double branch node load, second double branch node load, first double branch impedance matcher And a second double branch impedance matcher, the band pass filter being bilaterally symmetric about the central axis, wherein:
- one end of the input microstrip line is connected to the input end, and the other end of the input microstrip line is connected to the first double branch impedance matching device;
- one end of the output microstrip line is connected to the output end, and the other end of the output microstrip line is connected to a second double-branch section impedance matcher;
- the first coupling line includes a first coupled microstrip line and a second coupled microstrip line, and one of the first coupled microstrip lines The end is orthogonally connected to one end of the second coupled microstrip line to form an L shape;
- the second coupling line includes a third coupled microstrip line and a fourth coupled microstrip line, and one end of the third coupled microstrip line is orthogonally connected to one end of the fourth coupled microstrip line to form an L shape;
- the ring resonator is a rectangular resonator composed of four resonant microstrip lines, and the ring resonator is disposed between the second coupled microstrip line and the fourth coupled microstrip line;
- the first dual branch node load includes a first load microstrip line and a second load microstrip line
- the second double branch node load includes a third load microstrip line and a fourth load microstrip line
- the first load One end of the microstrip line is connected to the input end
- the other end of the first load microstrip line is connected to one end of the second load microstrip line
- one end of the third load microstrip line is connected to the output end
- the third load microstrip line is connected The other end is connected to one end of the fourth load microstrip line.
- the ring resonator comprises a first resonant microstrip line, a second resonant microstrip line, a third resonant microstrip line and a fourth resonant microstrip line, the first resonant microstrip line and the second coupling
- the spacing between the microstrip lines is equal to the spacing between the third resonant microstrip line and the fourth coupled microstrip line.
- a spacing between the input microstrip line and the first coupled microstrip line is equal to a spacing between the output microstrip line and the third coupled microstrip line.
- the first double-branch impedance matching device includes a first impedance matching line and a second impedance matching line
- the second double-branch impedance matching device includes a third impedance matching line and a fourth impedance matching line.
- one end of the first impedance matching line is orthogonally connected with one end of the input microstrip line to form an L shape, and the other end of the first impedance matching line is connected to one end of the second impedance matching line;
- One end of the third impedance matching line is orthogonally connected to one end of the output microstrip line to form an L shape, and the other end of the third impedance matching line is connected to one end of the fourth impedance matching line.
- the width of the strip line and the fourth coupled microstrip line is Cw ⁇ ⁇ . ⁇ ⁇
- a spacing between the first resonant microstrip line and the second coupled microstrip line, and a spacing between the third resonant microstrip line and the fourth coupled microstrip line 0.48 ⁇ ,
- the dielectric plate is a PCB having a thickness of 0.762 mm and a relative dielectric constant of 3.66.
- the band-pass filter based on the ring resonator of the present invention is bilaterally symmetric about the central axis ab of the band pass filter, wherein the middlemost four microstrip lines can form a ring resonator And loading a double-branch node load at the input terminal P1 and the output terminal P2 respectively, which can provide a good band pass matching effect in the working frequency band of the band pass filter of the present invention.
- the band-pass filter based on the ring resonator of the present invention can have a good suppression effect on the out-of-band signal, has high selectivity to the pass band signal, introduces less noise, and avoids interference to the RF front end.
- FIG. 1 is a schematic plan view showing a preferred embodiment of a band pass filter based on a ring resonator of the present invention.
- FIG. 2 is a schematic view showing the structure of a preferred embodiment of a band-pass filter based on a ring resonator of the present invention.
- FIG. 3 is a schematic diagram of S-parameter results of a band-pass filter based on a ring resonator of the present invention simulated by electromagnetic simulation software. [0025] FIG.
- FIG. 1 is a plan view showing a planar structure of a preferred embodiment of a band-pass filter based on a ring resonator of the present invention.
- the band pass filter includes a dielectric plate 1, an input terminal P1 etched on the upper surface of the dielectric plate 1, an output terminal P2, an input microstrip line 11, an output microstrip line 12, and a first coupling line. 13.
- the dielectric plate 1 is a PCB board, and the specific plate type is Roger RO4350B, wherein the relative dielectric constant is 3.66, and the plate thickness is 0.762 mm.
- the ground metal layer is a copper-clad metal layer laid on the lower surface of the dielectric plate 1.
- One end of the input microstrip line 11 is connected to the input end P1, and the other end of the input microstrip line 11 is connected to the first double branch impedance matching device 18; one end of the output microstrip line 12 is connected to the output end P2, The other end of the output microstrip line 12 is connected to the second double branch impedance matcher 19.
- the first dual branch impedance matcher 18 includes a first impedance matching line 181 and a second impedance matching line 182, and the second double branch impedance matching unit 18 includes a third impedance matching line 191 and a fourth impedance matching line 192.
- One end of the first impedance matching line 181 is orthogonally connected to one end of the input microstrip line 11 to form an L shape, that is, the first impedance matching line 181 and the input microstrip line 11 are perpendicularly connected to each other, and the other end of the first impedance matching line 181 is connected.
- One end of the third impedance matching line 1 91 is orthogonally connected to one end of the output microstrip line 12 to form an L shape, that is, the third impedance matching line 191 and the output microstrip line 12 are perpendicularly connected to each other, and the other end of the third impedance matching line 191 is connected.
- the first coupling line 13 includes a first coupled microstrip line 131 and a second coupled microstrip line 132. One end of the first coupled microstrip line 131 is orthogonally connected to one end of the second coupled microstrip line 132.
- the L-shape that is, the first coupled microstrip line 131 and the second coupled microstrip line 132 are perpendicularly connected to each other.
- the second coupling line 14 includes a third coupled microstrip line 141 and a fourth coupled microstrip line 142. One end of the third coupled microstrip line 141 is orthogonally connected to one end of the fourth coupled microstrip line 142 to form an L shape.
- the third coupled microstrip line 141 and the fourth coupled microstrip line 142 are perpendicularly connected to each other.
- the input microstrip line 11 is spaced apart from the first coupled microstrip line 131
- the output microstrip line 12 is spaced apart from the third coupled microstrip line 141.
- the input microstrip line 11 and the first coupled microstrip line are spaced apart.
- the spacing between 131 is equal to the spacing between the output microstrip line 12 and the third coupled microstrip line 141.
- the ring resonator 15 is disposed between the second coupled microstrip line 132 and the fourth coupled microstrip line 142, and the ring resonator 15 is formed by a rectangle of four resonant microstrip lines, that is, the first resonant microstrip line 151.
- a rectangular resonator composed of a second resonant microstrip line 152, a third resonant microstrip line 153, and a fourth resonant microstrip line 154.
- the first resonant microstrip line 151 of the ring resonator 15 is spaced apart from the second coupled microstrip line 132, and the third resonant microstrip line 153 of the ring resonator 15 is spaced apart from the fourth coupled microstrip line 142.
- the spacing between the first resonant microstrip line 151 and the second coupled microstrip line 132 is equal to the spacing between the third resonant microstrip line 153 and the fourth coupled microstrip line 142.
- the first dual branch circuit load 16 includes a first load microstrip line 161 and a second load microstrip line 162, and the second double branch circuit load 17 includes a third load microstrip line 171 and a fourth load microstrip Line 172.
- One end of the first load microstrip line 161 is connected to the input terminal P1, and the other end of the first load microstrip line 161 is connected to one end of the second load microstrip line 162.
- One end of the third load microstrip line 171 is connected to the output terminal P2, and the other end of the third load microstrip line 171 is connected to one end of the fourth load microstrip line 172.
- connection of the first load microstrip line 161 to the input terminal P1 does not overlap with the connection of the input microstrip line 11 to the input terminal P1, such that the first coupled microstrip line 131 is spaced from the first load microstrip line 161 There is a gap to prevent mutual interference of signal energy between the two.
- the junction of the third load microstrip line 171 connected to the output terminal P2 and the output microstrip line 12 connected to the output terminal P1 do not overlap, such that the third coupled microstrip line 141 is spaced from the third load microstrip line 171 There is a gap to prevent mutual interference of signal energy between the two.
- a spacing between the first coupled microstrip line 131 and the first load microstrip line 161 is equal to a spacing between the third coupled microstrip line 141 and the third loaded microstrip line 171, the spacing Preferably, it is 2 mm to 5 mm to avoid mutual interference of signal energy between the two.
- the band-pass filter based on the ring resonator of the present invention is bilaterally symmetrical with respect to the central axis ab of the band pass filter.
- the band-resonator-based band-pass filter of the present invention is compared with the existing band-pass filter, wherein the middlemost four microstrip lines can form a ring resonator, and one of the input terminal P1 and the output terminal P2 are respectively loaded.
- the double-branch node load can provide a good band pass matching effect in the operating band of the band pass filter of the present invention.
- the band pass filter designed by the above structure can have a good suppression effect on the out-of-band signal, has high selectivity to the passband signal, introduces less noise, and avoids interference to the RF front end.
- FIG. 2 is a structural rule of a preferred embodiment of a bandpass filter based on a ring resonator of the present invention.
- the invention etches the input terminal PI on the upper surface of the dielectric plate 1, the output terminal P2, the input microstrip line 11, the output microstrip line 12, the first coupling line 13, the second coupling line 14, the ring resonator 15, the first
- the double branch node load 16, the second double branch node load 17, the first double branch impedance matcher 18 and the second double branch impedance matcher 19 are all metal copper sheets, and the input microstrip line and output micro are involved in the present invention.
- the strip line, the load microstrip line, the coupled microstrip line, and the resonant microstrip line are all metal strip microstrip lines with a strip structure, just to distinguish each microstrip line by a different name.
- the present invention is exemplified by an operating band in the range of 1.82 GHz to 2.19 GHz, and the length and width of the structural dimensions of the preferred embodiment of the bandpass filter based on the ring resonator of the present invention are illustrated by way of specific embodiments.
- FIG. 3 is a schematic diagram showing the result of simulating the S-parameter of the band-pass filter based on the ring resonator of the present invention through electromagnetic simulation software.
- bandpass filters allow signals from different frequency bands to enter the system, filtering out-of-band signals or noise.
- the reflection coefficient (IS11I) of the band pass filter of the present invention is below -10 dB in the range of 1.82 GHz to 2.19 GHz, indicating that the band pass filter can operate from 1.82 GHz to 2.19 GHz. , can achieve 18.5% relative bandwidth.
- the band pass filter of the present invention has a transmission characteristic (IS21I) of -33 dB, and at 2.7 GHz, IS21 ⁇ reaches -72 dB, so the band pass filter of the present invention has high selectivity. It can be seen that the band-pass filter based on the ring resonator of the invention can have a good suppression effect on the out-of-band signal, has high selectivity to the passband signal, introduces less noise, and avoids interference to the RF front end, so Improve the performance of microwave circuits.
- IS21I transmission characteristic
- the band-pass filter based on the ring resonator of the present invention is bilaterally symmetric with respect to the central axis ab of the band pass filter, wherein the middlemost four microstrip lines can form a ring resonator And loading a double-branch node load at the input terminal P1 and the output terminal P2 respectively, which can provide a good band pass matching effect in the working frequency band of the band pass filter of the present invention.
- the band-pass filter based on the ring resonator of the present invention can have a good suppression effect on the out-of-band signal, has high selectivity to the pass band signal, introduces less noise, and avoids interference to the RF front end.
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Abstract
The present invention provides a band-pass filter based on a ring resonator. The band-pass filter comprises: a dielectric slab; a ground metal layer provided on the lower surface of the dielectric slab; and an input end, an output end, an input microstrip line, an output microstrip line, a first coupling line, a second coupling line, a ring resonator, a first double-stub open load, a second double-stub open load, a first double-stub impedance matcher, and a second double-stub impedance matcher which are formed on the upper surface of the dielectric slab by means of etching. The band-pass filter is symmetrical about a central axis. According to the present invention, the band-pass filter is symmetrical about a central axis; a ring resonator is formed by the middlemost four microstrip lines, and a double-stub open load is separately loaded at the input end and the output end, to bring a good band-pass matching effect for the band-pass filter within a working band, apply a good inhibitory effect on out-of-band signals, achieve high selectivity on passband signals, introduce less noise, and avoid interference with a radio frequency front end.
Description
基于环形谐振器的带通滤波器 技术领域 Band-pass filter based on ring resonator
[0001] 本发明涉及射频微波通信技术领域， 尤其涉及一种基于环形谐振器的带通滤波 器。 [0001] The present invention relates to the field of radio frequency microwave communication technologies, and in particular, to a bandpass filter based on a ring resonator.
背景技术 Background technique
[0002] 滤波器作为射频前端的一种很重要器件， 可以滤除带外噪声， 提高电路***的 灵敏度。 微带滤波器是用来分离不同频率微波信号的一种器件。 它的主要作用 是抑制不需要的信号， 使其不能通过滤波器， 只让需要的信号通过。 在微波电 路***中， 滤波器的性能对电路***的性能指标有很大的影响。 由于现代通信 ***中通信频段的多样性， 现有技术的带通滤波器的选择性往往不够， 不能满 足通信频段多样性的需求， 影响了整个通信***的性能。 [0002] As a very important device in the RF front-end, the filter can filter out-of-band noise and improve the sensitivity of the circuit system. A microstrip filter is a device used to separate microwave signals of different frequencies. Its main function is to suppress unwanted signals so that they cannot pass through the filter and only pass the desired signal. In microwave circuit systems, the performance of the filter has a large impact on the performance of the circuit system. Due to the diversity of communication bands in modern communication systems, the selectivity of prior art bandpass filters is often insufficient to meet the diversity of communication bands and affect the performance of the entire communication system.
技术问题 technical problem
[0003] 本发明的目的在于提供一种基于环形谐振器的带通滤波器， 旨在解决现有带通 滤波器的选择性不高的技术问题。 An object of the present invention is to provide a band-pass filter based on a ring resonator, which aims to solve the technical problem of low selectivity of the conventional band-pass filter.
问题的解决方案 Problem solution
技术解决方案 Technical solution
[0004] 为实现上述目的， 本发明提供了一种基于环形谐振器的带通滤波器， 包括介质 板、 设置在介质板下表面的地面金属层以及刻蚀在介质板上表面的输入端、 输 出端、 输入微带线、 输出微带线、 第一耦合线、 第二耦合线、 环形谐振器、 第 一双枝节幵路负载、 第二双枝节幵路负载、 第一双枝节阻抗匹配器和第二双枝 节阻抗匹配器， 该带通滤波器关于中心轴线左右对称， 其中： [0004] In order to achieve the above object, the present invention provides a band-pass filter based on a ring resonator, comprising a dielectric plate, a ground metal layer disposed on a lower surface of the dielectric plate, and an input end etched on a surface of the dielectric plate, Output terminal, input microstrip line, output microstrip line, first coupling line, second coupling line, ring resonator, first double branch node load, second double branch node load, first double branch impedance matcher And a second double branch impedance matcher, the band pass filter being bilaterally symmetric about the central axis, wherein:
[0005] 所述输入微带线的一端连接至所述输入端， 该输入微带线的另一端连接至第一 双枝节阻抗匹配器； [0005] one end of the input microstrip line is connected to the input end, and the other end of the input microstrip line is connected to the first double branch impedance matching device;
[0006] 所述输出微带线的一端连接至所述输出端， 该输出微带线的另一端连接至第二 双枝节阻抗匹配器； [0006] one end of the output microstrip line is connected to the output end, and the other end of the output microstrip line is connected to a second double-branch section impedance matcher;
[0007] 所述第一耦合线包括第一耦合微带线和第二耦合微带线， 第一耦合微带线的一
端与第二耦合微带线的一端正交连接形成 L形； [0007] The first coupling line includes a first coupled microstrip line and a second coupled microstrip line, and one of the first coupled microstrip lines The end is orthogonally connected to one end of the second coupled microstrip line to form an L shape;
[0008] 所述第二耦合线包括第三耦合微带线和第四耦合微带线， 第三耦合微带线的一 端与第四耦合微带线的一端正交连接形成 L形； [0008] The second coupling line includes a third coupled microstrip line and a fourth coupled microstrip line, and one end of the third coupled microstrip line is orthogonally connected to one end of the fourth coupled microstrip line to form an L shape;
[0009] 所述环形谐振器是由四根谐振微带线构成的矩形谐振器， 该环形谐振器设置在 第二耦合微带线与第四耦合微带线之间； [0009] The ring resonator is a rectangular resonator composed of four resonant microstrip lines, and the ring resonator is disposed between the second coupled microstrip line and the fourth coupled microstrip line;
[0010] 第一双枝节幵路负载包括第一负载微带线以及第二负载微带线， 第二双枝节幵 路负载包括第三负载微带线以及第四负载微带线， 第一负载微带线的一端连接 至输入端， 第一负载微带线的另一端连接至第二负载微带线的一端， 第三负载 微带线的一端连接至输出端， 第三负载微带线的另一端连接至第四负载微带线 的一端。 [0010] The first dual branch node load includes a first load microstrip line and a second load microstrip line, and the second double branch node load includes a third load microstrip line and a fourth load microstrip line, the first load One end of the microstrip line is connected to the input end, the other end of the first load microstrip line is connected to one end of the second load microstrip line, one end of the third load microstrip line is connected to the output end, and the third load microstrip line is connected The other end is connected to one end of the fourth load microstrip line.
[0011] 优选的， 所述环形谐振器包括第一谐振微带线、 第二谐振微带线、 第三谐振微 带线和第四谐振微带线， 第一谐振微带线与第二耦合微带线之间的间距等于第 三谐振微带线与第四耦合微带线之间的间距。 [0011] Preferably, the ring resonator comprises a first resonant microstrip line, a second resonant microstrip line, a third resonant microstrip line and a fourth resonant microstrip line, the first resonant microstrip line and the second coupling The spacing between the microstrip lines is equal to the spacing between the third resonant microstrip line and the fourth coupled microstrip line.
[0012] 优选的， 所述输入微带线与第一耦合微带线之间的间距等于所述输出微带线与 第三耦合微带线之间的间距。 [0012] Preferably, a spacing between the input microstrip line and the first coupled microstrip line is equal to a spacing between the output microstrip line and the third coupled microstrip line.
[0013] 优选的， 所述第一双枝节阻抗匹配器包括第一阻抗匹配线和第二阻抗匹配线， 所述第二双枝节阻抗匹配器包括第三阻抗匹配线和第四阻抗匹配线， 其中： [0014] 所述第一阻抗匹配线的一端与输入微带线的一端正交连接形成 L形， 第一阻抗 匹配线的另一端连接至第二阻抗匹配线的一端； [0013] Preferably, the first double-branch impedance matching device includes a first impedance matching line and a second impedance matching line, and the second double-branch impedance matching device includes a third impedance matching line and a fourth impedance matching line. Wherein: [0014] one end of the first impedance matching line is orthogonally connected with one end of the input microstrip line to form an L shape, and the other end of the first impedance matching line is connected to one end of the second impedance matching line;
[0015] 所述第三阻抗匹配线的一端与输出微带线的一端正交连接形成 L形， 第三阻抗 匹配线的另一端连接至第四阻抗匹配线的一端。 [0015] One end of the third impedance matching line is orthogonally connected to one end of the output microstrip line to form an L shape, and the other end of the third impedance matching line is connected to one end of the fourth impedance matching line.
[0016] 优选的， 所述第一阻抗匹配线和第三阻抗匹配线的长度均为1^ 2=23.41^^ 宽度 均为 W 2=0.27mm， 第二阻抗匹配线和第四阻抗匹配线的长度均为 L 1=21.64ηιιη. 宽度均为 W ,=2.830^1。 [0016] Preferably, the length of the first line and the third impedance matching lines are 1 ^ 2 = 23.41 ^^ width are 2 = 0.27mm W, the second impedance matching line and the fourth line The length is L 1 = 21.64 ηιιη. The width is W, = 2.830^1.
[0017] 优选的， 所述第一谐振微带线和第三谐振微带线的长度均为 C u=23.48mm， 第 二谐振微带线和第四谐振微带线的长度均为1^=23.081^^ 第一谐振微带线、 第 二谐振微带线、 第三谐振微带线和第四谐振微带线的宽度均为 W 5=0.25mm。 [0017] Preferably, the lengths of the first resonant microstrip line and the third resonant microstrip line are both C u =23.48 mm, and the lengths of the second resonant microstrip line and the fourth resonant microstrip line are both 1^ =23.081^^ The width of the first resonant microstrip line, the second resonant microstrip line, the third resonant microstrip line, and the fourth resonant microstrip line are both W 5 = 0.25 mm.
[0018] 优选的， 所述输入端和输出端的长度均为 L。=15mm、 宽度均为 W。=1.66mm，
所述输入微带线、 输出微带线的长度均为 C 12=23.8mm、 宽度为 Cw 2=0.14mm; 所述第一耦合微带线和第三耦合微带线的长度均为 C 12=23.8mm, 所述第二耦合 微带线和第四耦合微带线长度均为 ^,=23.481^!!， 所述第一耦合微带线、 第二耦 合微带线、 第三耦合微带线和第四耦合微带线的宽度为 Cw ^Ο. Πη η^ [0018] Preferably, the length of the input end and the output end are both L. =15mm, width is W. =1.66mm, The lengths of the input microstrip line and the output microstrip line are both C 12 = 23.8 mm and the width is Cw 2 = 0.14 mm; the lengths of the first coupled microstrip line and the third coupled microstrip line are both C 12 = 23.8mm, the length of the second coupled microstrip line and the fourth coupled microstrip line are ^, = 23.481^!!, the first coupled microstrip line, the second coupled microstrip line, and the third coupled micro The width of the strip line and the fourth coupled microstrip line is Cw ^ Ο. Πη η^
[0019] 优选的， 所述第一负载微带线和第三负载微带线的长度为 L 4=22.3mm、 宽度均 为\¥ 4=1.421^^ 第二负载微带线和第四负载微带线的长度为1^=22.671^^ 宽度 均为 W 3=0.915mm。 [0019] Preferably, the lengths of the first load microstrip line and the third load microstrip line are L 4 = 22.3 mm, and the width is both \¥ 4 =1.421^^ the second load microstrip line and the fourth load The length of the microstrip line is 1^=22.671^^ and the width is W 3 =0.915 mm.
[0020] 优选的， 所述第一谐振微带线与第二耦合微带线之间的间距、 第三谐振微带线 与第四耦合微带线之间的间距 Cs 1=0.48ιηιη, 所述输入微带线与第一耦合微带线 之间的间距、 输出微带线与第三耦合微带线之间的间距均为 Cs 2=0.465mm。 [0020] Preferably, a spacing between the first resonant microstrip line and the second coupled microstrip line, and a spacing between the third resonant microstrip line and the fourth coupled microstrip line Cs 1 = 0.48ιηιη, The spacing between the input microstrip line and the first coupled microstrip line, and the spacing between the output microstrip line and the third coupled microstrip line are both Cs 2 =0.465 mm.
[0021] 优选的， 所述介质板是板厚为 0.762mm、 相对介电常数 3.66的 PCB板。 [0021] Preferably, the dielectric plate is a PCB having a thickness of 0.762 mm and a relative dielectric constant of 3.66.
发明的有益效果 Advantageous effects of the invention
有益效果 Beneficial effect
[0022] 相较于现有技术， 本发明所述基于环形谐振器的带通滤波器关于该带通滤波器 的中心轴线 ab左右对称， 其中最中间的四条微带线可构成一个环形谐振器， 并在 输入端 P1和输出端 P2分别加载了一个双枝节幵路负载， 可以为本发明所述带通 滤波器在工作频带内提供良好的带通匹配效果。 此外， 本发明所述基于环形谐 振器的带通滤波器， 能够对带外信号有良好的抑制效果， 对通带信号具有高选 择性， 引入更少噪声， 避免对射频前端造成干扰。 [0022] Compared with the prior art, the band-pass filter based on the ring resonator of the present invention is bilaterally symmetric about the central axis ab of the band pass filter, wherein the middlemost four microstrip lines can form a ring resonator And loading a double-branch node load at the input terminal P1 and the output terminal P2 respectively, which can provide a good band pass matching effect in the working frequency band of the band pass filter of the present invention. In addition, the band-pass filter based on the ring resonator of the present invention can have a good suppression effect on the out-of-band signal, has high selectivity to the pass band signal, introduces less noise, and avoids interference to the RF front end.
对附图的简要说明 Brief description of the drawing
附图说明 DRAWINGS
[0023] 图 1是本发明基于环形谐振器的带通滤波器优选实施例的平面结构示意图。 1 is a schematic plan view showing a preferred embodiment of a band pass filter based on a ring resonator of the present invention.
[0024] 图 2是本发明基于环形谐振器的带通滤波器优选实施例的结构尺寸示意图。 2 is a schematic view showing the structure of a preferred embodiment of a band-pass filter based on a ring resonator of the present invention.
[0025] 图 3是本发明基于环形谐振器的带通滤波器通过电磁仿真软件仿真的 S参数结果 示意图。 3 is a schematic diagram of S-parameter results of a band-pass filter based on a ring resonator of the present invention simulated by electromagnetic simulation software. [0025] FIG.
实施该发明的最佳实施例 BEST MODE FOR CARRYING OUT THE INVENTION
本发明的最佳实施方式
[0026] 下面结合具体实施例对本发明做进一步的详细说明， 以下实施例是对本发明的 解释， 本发明并不局限于以下实施例。 BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be further described in detail with reference to the preferred embodiments thereof. The following examples are illustrative of the invention, and the invention is not limited to the following examples.
[0027] 参考图 1所示， 图 1是本发明基于环形谐振器的带通滤波器优选实施例的平面结 构示意图。 在本实施例中， 所述带通滤波器包括介质板 1， 刻蚀在介质板 1上表 面的输入端 Pl、 输出端 P2、 输入微带线 11、 输出微带线 12、 第一耦合线 13、 第 二耦合线 14、 环形谐振器 15、 第一双枝节幵路负载 16、 第二双枝节幵路负载 17 、 第一双枝节阻抗匹配器 18、 第二双枝节阻抗匹配器 19， 以及设置在介质板 1下 表面的地面金属层 （图 1中未示出） 。 所述介质板 1为一种 PCB板， 具体的板材类 型为 Roger RO4350B , 其中相对介电常数 3.66， 板厚为 0.762mm。 所述地面金属 层为敷设在介质板 1下表面的敷铜金属层。 Referring to FIG. 1, FIG. 1 is a plan view showing a planar structure of a preferred embodiment of a band-pass filter based on a ring resonator of the present invention. In this embodiment, the band pass filter includes a dielectric plate 1, an input terminal P1 etched on the upper surface of the dielectric plate 1, an output terminal P2, an input microstrip line 11, an output microstrip line 12, and a first coupling line. 13. A second coupling line 14, a ring resonator 15, a first double branch circuit load 16, a second double branch circuit load 17, a first double branch impedance matcher 18, a second double link impedance matcher 19, and A ground metal layer (not shown in Fig. 1) provided on the lower surface of the dielectric plate 1. The dielectric plate 1 is a PCB board, and the specific plate type is Roger RO4350B, wherein the relative dielectric constant is 3.66, and the plate thickness is 0.762 mm. The ground metal layer is a copper-clad metal layer laid on the lower surface of the dielectric plate 1.
[0028] 所述输入微带线 11的一端连接至输入端 P1， 输入微带线 11的另一端连接至第一 双枝节阻抗匹配器 18; 输出微带线 12的一端连接至输出端 P2， 输出微带线 12的 另一端连接至第二双枝节阻抗匹配器 19。 第一双枝节阻抗匹配器 18包括第一阻 抗匹配线 181和第二阻抗匹配线 182， 第二双枝节阻抗匹配器 18包括第三阻抗匹 配线 191和第四阻抗匹配线 192。 第一阻抗匹配线 181的一端与输入微带线 11的一 端正交连接形成 L形， 即第一阻抗匹配线 181与输入微带线 11相互垂直连接， 第 一阻抗匹配线 181的另一端连接至第二阻抗匹配线 182的一端。 第三阻抗匹配线 1 91的一端与输出微带线 12的一端正交连接形成 L形， 即第三阻抗匹配线 191与输 出微带线 12相互垂直连接， 第三阻抗匹配线 191的另一端连接至第四阻抗匹配线 192的一端。 [0028] One end of the input microstrip line 11 is connected to the input end P1, and the other end of the input microstrip line 11 is connected to the first double branch impedance matching device 18; one end of the output microstrip line 12 is connected to the output end P2, The other end of the output microstrip line 12 is connected to the second double branch impedance matcher 19. The first dual branch impedance matcher 18 includes a first impedance matching line 181 and a second impedance matching line 182, and the second double branch impedance matching unit 18 includes a third impedance matching line 191 and a fourth impedance matching line 192. One end of the first impedance matching line 181 is orthogonally connected to one end of the input microstrip line 11 to form an L shape, that is, the first impedance matching line 181 and the input microstrip line 11 are perpendicularly connected to each other, and the other end of the first impedance matching line 181 is connected. To one end of the second impedance matching line 182. One end of the third impedance matching line 1 91 is orthogonally connected to one end of the output microstrip line 12 to form an L shape, that is, the third impedance matching line 191 and the output microstrip line 12 are perpendicularly connected to each other, and the other end of the third impedance matching line 191 is connected. Connected to one end of the fourth impedance matching line 192.
[0029] 所述第一耦合线 13包括第一耦合微带线 131和第二耦合微带线 132， 第一耦合微 带线 131的一端与第二耦合微带线 132的一端正交连接形成 L形， 即第一耦合微带 线 131与第二耦合微带线 132相互垂直连接。 第二耦合线 14包括第三耦合微带线 1 41和第四耦合微带线 142， 第三耦合微带线 141的一端与第四耦合微带线 142的一 端正交连接形成 L形， 即第三耦合微带线 141与第四耦合微带线 142相互垂直连接 。 其中， 输入微带线 11与第一耦合微带线 131之间隔有间距， 输出微带线 12与第 三耦合微带线 141之间隔有间距， 输入微带线 11与第一耦合微带线 131之间的间 距等于输出微带线 12与第三耦合微带线 141之间的间距。
[0030] 环形谐振器 15设置在第二耦合微带线 132与第四耦合微带线 142之间， 环形谐振 器 15由四根谐振微带线构成的矩形， 即由第一谐振微带线 151、 第二谐振微带线 152、 第三谐振微带线 153和第四谐振微带线 154构成的矩形谐振器。 环形谐振器 15的第一谐振微带线 151与第二耦合微带线 132之间隔有间距， 环形谐振器 15的 第三谐振微带线 153与第四耦合微带线 142之间隔有间距， 第一谐振微带线 151与 第二耦合微带线 132之间的间距等于第三谐振微带线 153与第四耦合微带线 142之 间的间距。 [0029] The first coupling line 13 includes a first coupled microstrip line 131 and a second coupled microstrip line 132. One end of the first coupled microstrip line 131 is orthogonally connected to one end of the second coupled microstrip line 132. The L-shape, that is, the first coupled microstrip line 131 and the second coupled microstrip line 132 are perpendicularly connected to each other. The second coupling line 14 includes a third coupled microstrip line 141 and a fourth coupled microstrip line 142. One end of the third coupled microstrip line 141 is orthogonally connected to one end of the fourth coupled microstrip line 142 to form an L shape. The third coupled microstrip line 141 and the fourth coupled microstrip line 142 are perpendicularly connected to each other. The input microstrip line 11 is spaced apart from the first coupled microstrip line 131, and the output microstrip line 12 is spaced apart from the third coupled microstrip line 141. The input microstrip line 11 and the first coupled microstrip line are spaced apart. The spacing between 131 is equal to the spacing between the output microstrip line 12 and the third coupled microstrip line 141. [0030] The ring resonator 15 is disposed between the second coupled microstrip line 132 and the fourth coupled microstrip line 142, and the ring resonator 15 is formed by a rectangle of four resonant microstrip lines, that is, the first resonant microstrip line 151. A rectangular resonator composed of a second resonant microstrip line 152, a third resonant microstrip line 153, and a fourth resonant microstrip line 154. The first resonant microstrip line 151 of the ring resonator 15 is spaced apart from the second coupled microstrip line 132, and the third resonant microstrip line 153 of the ring resonator 15 is spaced apart from the fourth coupled microstrip line 142. The spacing between the first resonant microstrip line 151 and the second coupled microstrip line 132 is equal to the spacing between the third resonant microstrip line 153 and the fourth coupled microstrip line 142.
[0031] 第一双枝节幵路负载 16包括第一负载微带线 161以及第二负载微带线 162， 第二 双枝节幵路负载 17包括第三负载微带线 171以及第四负载微带线 172。 第一负载 微带线 161的一端连接至输入端 Pl， 第一负载微带线 161的另一端连接至第二负 载微带线 162的一端。 第三负载微带线 171的一端连接至输出端 P2， 第三负载微 带线 171的另一端连接至第四负载微带线 172的一端。 第一负载微带线 161连接至 输入端 P1的连接处与输入微带线 11连接至输入端 P1的连接处不重叠， 使得第一 耦合微带线 131与第一负载微带线 161之间隔有间距， 从而防止两者之间信号能 量的相互干扰。 第三负载微带线 171连接至输出端 P2的连接处与输出微带线 12连 接至输出端 P1的连接处不重叠， 使得第三耦合微带线 141与第三负载微带线 171 之间隔有间距， 从而防止两者之间信号能量的相互干扰。 在本实施例中， 所述 第一耦合微带线 131与第一负载微带线 161之间的间距等于第三耦合微带线 141与 第三负载微带线 171之间的间距， 该间距优选为 2mm至 5mm， 即可避免两者之间 信号能量的相互干扰。 [0031] The first dual branch circuit load 16 includes a first load microstrip line 161 and a second load microstrip line 162, and the second double branch circuit load 17 includes a third load microstrip line 171 and a fourth load microstrip Line 172. One end of the first load microstrip line 161 is connected to the input terminal P1, and the other end of the first load microstrip line 161 is connected to one end of the second load microstrip line 162. One end of the third load microstrip line 171 is connected to the output terminal P2, and the other end of the third load microstrip line 171 is connected to one end of the fourth load microstrip line 172. The connection of the first load microstrip line 161 to the input terminal P1 does not overlap with the connection of the input microstrip line 11 to the input terminal P1, such that the first coupled microstrip line 131 is spaced from the first load microstrip line 161 There is a gap to prevent mutual interference of signal energy between the two. The junction of the third load microstrip line 171 connected to the output terminal P2 and the output microstrip line 12 connected to the output terminal P1 do not overlap, such that the third coupled microstrip line 141 is spaced from the third load microstrip line 171 There is a gap to prevent mutual interference of signal energy between the two. In this embodiment, a spacing between the first coupled microstrip line 131 and the first load microstrip line 161 is equal to a spacing between the third coupled microstrip line 141 and the third loaded microstrip line 171, the spacing Preferably, it is 2 mm to 5 mm to avoid mutual interference of signal energy between the two.
[0032] 需要说明的是， 本发明所述基于环形谐振器的带通滤波器关于该带通滤波器的 中心轴线 ab左右对称。 本发明所述基于环形谐振器的带通滤波器相对于现有带通 滤波器， 其中最中间的四条微带线可构成一个环形谐振器， 并在输入端 P1和输 出端 P2分别加载了一个双枝节幵路负载， 可以为本发明所述带通滤波器在工作 频带内提供良好的带通匹配效果。 此外， 本发明通过上述结构设计的带通滤波 器， 能够对带外信号有良好的抑制效果， 对通带信号具有高选择性， 引入更少 噪声， 避免对射频前端造成干扰。 It should be noted that the band-pass filter based on the ring resonator of the present invention is bilaterally symmetrical with respect to the central axis ab of the band pass filter. The band-resonator-based band-pass filter of the present invention is compared with the existing band-pass filter, wherein the middlemost four microstrip lines can form a ring resonator, and one of the input terminal P1 and the output terminal P2 are respectively loaded. The double-branch node load can provide a good band pass matching effect in the operating band of the band pass filter of the present invention. In addition, the band pass filter designed by the above structure can have a good suppression effect on the out-of-band signal, has high selectivity to the passband signal, introduces less noise, and avoids interference to the RF front end.
[0033] 参考图 2所示， 图 2是本发明基于环形谐振器的带通滤波器优选实施例的结构尺
寸示意图。 本发明刻蚀在介质板 1上表面的输入端 PI、 输出端 P2、 输入微带线 11 、 输出微带线 12、 第一耦合线 13、 第二耦合线 14、 环形谐振器 15、 第一双枝节 幵路负载 16、 第二双枝节幵路负载 17、 第一双枝节阻抗匹配器 18和第二双枝节 阻抗匹配器 19均为金属铜片， 本发明涉及的输入微带线、 输出微带线、 负载微 带线、 耦合微带线、 谐振微带线均为采用条形结构的金属铜片微带线， 只是为 了区别每一根微带线采用了不同的名称命名。 本发明以在 1.82GHz到 2.19GHz内 的工作频带为例， 通过具体的实施例来说明本发明基于环形谐振器的带通滤波 器优选实施例的结构尺寸的长度和宽度。 Referring to FIG. 2, FIG. 2 is a structural rule of a preferred embodiment of a bandpass filter based on a ring resonator of the present invention. Inch schematic. The invention etches the input terminal PI on the upper surface of the dielectric plate 1, the output terminal P2, the input microstrip line 11, the output microstrip line 12, the first coupling line 13, the second coupling line 14, the ring resonator 15, the first The double branch node load 16, the second double branch node load 17, the first double branch impedance matcher 18 and the second double branch impedance matcher 19 are all metal copper sheets, and the input microstrip line and output micro are involved in the present invention. The strip line, the load microstrip line, the coupled microstrip line, and the resonant microstrip line are all metal strip microstrip lines with a strip structure, just to distinguish each microstrip line by a different name. The present invention is exemplified by an operating band in the range of 1.82 GHz to 2.19 GHz, and the length and width of the structural dimensions of the preferred embodiment of the bandpass filter based on the ring resonator of the present invention are illustrated by way of specific embodiments.
[0034] 在本实施例中， 输入端 P1和输出端 P2的长度均为 L0=15mm、 宽度均为 W0=1.66 mm。 输入微带线 11和输出微带线 12的长度均为 C12=23.8mm、 宽度均为 Cw2=0.1 4mm。 In the embodiment, the lengths of the input end P1 and the output end P2 are both L0=15 mm and the width is W0=1.66 mm. The lengths of the input microstrip line 11 and the output microstrip line 12 are both C12=23.8 mm and the width is Cw2=0.1 4 mm.
[0035] 第一耦合微带线 131和第三耦合微带线 141的长度均为 C12=23.8mm， 第二耦合 微带线 132和第四耦合微带线 142长度均为 Cll=23.48mm。 第一耦合微带线 131、 第二耦合微带线 132、 第三耦合微带线 141和第四耦合微带线 142的宽度为 Cwl=0. 17mm。 [0035] The lengths of the first coupled microstrip line 131 and the third coupled microstrip line 141 are both C12=23.8 mm, and the lengths of the second coupled microstrip line 132 and the fourth coupled microstrip line 142 are both C11=23.48 mm. The width of the first coupled microstrip line 131, the second coupled microstrip line 132, the third coupled microstrip line 141, and the fourth coupled microstrip line 142 is Cwl = 0.17 mm.
[0036] 环形谐振器 15的第一谐振微带线 151和第三谐振微带线 153的长度均为 Cll=23.4 8mm, 第二谐振微带线 152和第四谐振微带线 154的长度均为 L5=23.08mm。 第一 谐振微带线 151、 第二谐振微带线 152、 第三谐振微带线、 和第四谐振微带线 154 的宽度均为 W5=0.25mm。 [0036] The lengths of the first resonant microstrip line 151 and the third resonant microstrip line 153 of the ring resonator 15 are both C11=23.4 8 mm, and the lengths of the second resonant microstrip line 152 and the fourth resonant microstrip line 154 are both It is L5=23.08mm. The widths of the first resonant microstrip line 151, the second resonant microstrip line 152, the third resonant microstrip line, and the fourth resonant microstrip line 154 are all W5 = 0.25 mm.
[0037] 第一负载微带线 161和第三负载微带线 171的长度均为 L4=22.3mm、 宽度均为 W 4=1.42mm; 第二负载微带线 162和第四负载微带线 172的长度为 L3=22.67mm、 宽 度均为 W3=0.915mm。 [0037] The lengths of the first load microstrip line 161 and the third load microstrip line 171 are both L4=22.3 mm, and the width is W 4=1.42 mm; the second load microstrip line 162 and the fourth load microstrip line The length of 172 is L3=22.67 mm, and the width is W3=0.915 mm.
[0038] 第一阻抗匹配线 181和第三阻抗匹配线 191的长度均为 L2=23.4mm、 宽度均为 W 2=0.27mm; 第二阻抗匹配线 182和第四阻抗匹配线 192的长度均为 Ll=21.64mm、 宽度均为 Wl=2.83mm。 [0038] The lengths of the first impedance matching line 181 and the third impedance matching line 191 are both L2=23.4 mm and the width is W 2=0.27 mm; the lengths of the second impedance matching line 182 and the fourth impedance matching line 192 are both It is Ll=21.64mm and the width is Wl=2.83mm.
[0039] 第一谐振微带线 151与第二耦合微带线 132之间的间距、 第三谐振微带线 153与 第四耦合微带线 142之间的间距 Csl=0.48mm。 输入微带线 11与第一耦合微带线 13 1之间的间距、 输出微带线 12与第三耦合微带线 141之间的间距均为 Cs2=0.465mm
[0040] 需要说明的是， 设置在 PCB板上的金属铜片厚度一般为 um级， 因此本发明并不 对输入端 Pl、 输出端 P2、 输入微带线 11、 输出微带线 12、 第一耦合线 13、 第二 耦合线 14、 环形谐振器 15、 第一双枝节幵路负载 16、 第二双枝节幵路负载 17、 第一双枝节阻抗匹配器 18和第二双枝节阻抗匹配器 19的金属铜片厚度加以限制 ， 并不影响本发明所述基于环形谐振器的带通滤波器的特性。 [0039] The spacing between the first resonant microstrip line 151 and the second coupled microstrip line 132, and the spacing between the third resonant microstrip line 153 and the fourth coupled microstrip line 142, Csl = 0.48 mm. The spacing between the input microstrip line 11 and the first coupled microstrip line 13 1 and the spacing between the output microstrip line 12 and the third coupled microstrip line 141 are both Cs2=0.465 mm [0040] It should be noted that the thickness of the metal copper plate disposed on the PCB board is generally um, so the present invention does not refer to the input terminal P1, the output terminal P2, the input microstrip line 11, the output microstrip line 12, and the first The coupling line 13, the second coupling line 14, the ring resonator 15, the first double branch circuit load 16, the second double branch node load 17, the first double branch impedance matcher 18, and the second double link impedance matcher 19 The thickness of the metal copper sheet is limited and does not affect the characteristics of the band-pass filter based on the ring resonator of the present invention.
[0041] 参考图 3所示， 图 3是本发明基于环形谐振器的带通滤波器通过电磁仿真软件仿 真的 S参数结果示意图。 一般地， 带通滤波器允许不同频带信号进入***， 滤除 带外信号或噪声。 从图 3可以看出， 可以看出在 1.82GHz到 2.19GHz内， 本发明带 通滤波器的反射系数 (IS11I)在 -10dB以下， 说明该带通滤波器可以工作在 1.82GHz 到 2.19GHz内， 可实现 18.5%的相对带宽。 在 1.1GHz处， 本发明所述带通滤波器 的传输特性 （IS21I) 可达到 -33dB， 在 2.7GHz处， IS21冋达到 -72dB， 所以本发 明所述带通滤波器具有高选择性。 由此可知， 本发明基于环形谐振器的带通滤 波器能够对带外信号有良好的抑制效果， 对通带信号具有高选择性， 引入更少 噪声， 避免对射频前端造成干扰， 因此可大幅提高微波电路的性能。 Referring to FIG. 3, FIG. 3 is a schematic diagram showing the result of simulating the S-parameter of the band-pass filter based on the ring resonator of the present invention through electromagnetic simulation software. In general, bandpass filters allow signals from different frequency bands to enter the system, filtering out-of-band signals or noise. As can be seen from Fig. 3, it can be seen that the reflection coefficient (IS11I) of the band pass filter of the present invention is below -10 dB in the range of 1.82 GHz to 2.19 GHz, indicating that the band pass filter can operate from 1.82 GHz to 2.19 GHz. , can achieve 18.5% relative bandwidth. At 1.1 GHz, the band pass filter of the present invention has a transmission characteristic (IS21I) of -33 dB, and at 2.7 GHz, IS21 冋 reaches -72 dB, so the band pass filter of the present invention has high selectivity. It can be seen that the band-pass filter based on the ring resonator of the invention can have a good suppression effect on the out-of-band signal, has high selectivity to the passband signal, introduces less noise, and avoids interference to the RF front end, so Improve the performance of microwave circuits.
[0042] 以上仅为本发明的优选实施例， 并非因此限制本发明的专利范围， 凡是利用本 发明说明书及附图内容所作的等效结构或等效流程变换， 或直接或间接运用在 其他相关的技术领域， 均同理包括在本发明的专利保护范围内。 The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the contents of the drawings may be directly or indirectly applied to other related The technical field is equally included in the scope of patent protection of the present invention.
工业实用性 Industrial applicability
[0043] 相较于现有技术， 本发明所述基于环形谐振器的带通滤波器关于该带通滤波器 的中心轴线 ab左右对称， 其中最中间的四条微带线可构成一个环形谐振器， 并在 输入端 P1和输出端 P2分别加载了一个双枝节幵路负载， 可以为本发明所述带通 滤波器在工作频带内提供良好的带通匹配效果。 此外， 本发明所述基于环形谐 振器的带通滤波器， 能够对带外信号有良好的抑制效果， 对通带信号具有高选 择性， 引入更少噪声， 避免对射频前端造成干扰。
Compared with the prior art, the band-pass filter based on the ring resonator of the present invention is bilaterally symmetric with respect to the central axis ab of the band pass filter, wherein the middlemost four microstrip lines can form a ring resonator And loading a double-branch node load at the input terminal P1 and the output terminal P2 respectively, which can provide a good band pass matching effect in the working frequency band of the band pass filter of the present invention. In addition, the band-pass filter based on the ring resonator of the present invention can have a good suppression effect on the out-of-band signal, has high selectivity to the pass band signal, introduces less noise, and avoids interference to the RF front end.
Claims
权利要求书 Claim
[权利要求 1] 一种基于环形谐振器的带通滤波器， 包括介质板以及设置在介质板下 表面的地面金属层， 其特征在于， 该基于环形谐振器的带通滤波器还 包括刻蚀在介质板上表面的输入端、 输出端、 输入微带线、 输出微带 线、 第一耦合线、 第二耦合线、 环形谐振器、 第一双枝节幵路负载、 第二双枝节幵路负载、 第一双枝节阻抗匹配器以及第二双枝节阻抗匹 配器， 该基于环形谐振器的带通滤波器关于该带通滤波器的中心轴线 左右对称， 其中： 所述输入微带线的一端连接至所述输入端， 该输入 微带线的另一端连接至第一双枝节阻抗匹配器； 所述输出微带线的一 端连接至所述输出端， 该输出微带线的另一端连接至第二双枝节阻抗 匹配器； 所述第一耦合线包括第一耦合微带线和第二耦合微带线， 第 一耦合微带线的一端与第二耦合微带线的一端正交连接形成 L形； 所 述第二耦合线包括第三耦合微带线和第四耦合微带线， 第三耦合微带 线的一端与第四耦合微带线的一端正交连接形成 L形； 所述环形谐振 器是由四根谐振微带线构成的矩形谐振器， 该环形谐振器设置在第二 耦合微带线与第四耦合微带线之间； 第一双枝节幵路负载包括第一负 载微带线以及第二负载微带线， 第二双枝节幵路负载包括第三负载微 带线以及第四负载微带线， 第一负载微带线的一端连接至输入端， 第 一负载微带线的另一端连接至第二负载微带线的一端， 第三负载微带 线的一端连接至输出端， 第三负载微带线的另一端连接至第四负载微 带线的一端。 [Claim 1] A ring resonator based band pass filter comprising a dielectric plate and a ground metal layer disposed on a lower surface of the dielectric plate, wherein the ring resonator based band pass filter further comprises etching Input on the surface of the dielectric board, output, input microstrip line, output microstrip line, first coupling line, second coupling line, ring resonator, first double branch load, second double branch circuit a load, a first double branch impedance matcher, and a second double branch impedance matcher, the ring resonator based band pass filter being bilaterally symmetric about a central axis of the band pass filter, wherein: one end of the input microstrip line Connected to the input end, the other end of the input microstrip line is connected to the first double branch impedance matching device; one end of the output microstrip line is connected to the output end, and the other end of the output microstrip line is connected to a second double branch impedance matching device; the first coupling line includes a first coupled microstrip line and a second coupled microstrip line, one end of the first coupled microstrip line and the second coupled microstrip line One end is orthogonally connected to form an L shape; the second coupling line includes a third coupled microstrip line and a fourth coupled microstrip line, and one end of the third coupled microstrip line is orthogonally connected with one end of the fourth coupled microstrip line L-shaped; the ring resonator is a rectangular resonator composed of four resonant microstrip lines, the ring resonator is disposed between the second coupled microstrip line and the fourth coupled microstrip line; the first double branch node The load includes a first load microstrip line and a second load microstrip line, and the second dual branch circuit load includes a third load microstrip line and a fourth load microstrip line, and one end of the first load microstrip line is connected to the input end The other end of the first load microstrip line is connected to one end of the second load microstrip line, one end of the third load microstrip line is connected to the output end, and the other end of the third load microstrip line is connected to the fourth load microstrip line One end of the line.
[权利要求 2] 根据权利要求 1所述的基于环形谐振器的带通滤波器， 其特征在于， 所述环形谐振器包括第一谐振微带线、 第二谐振微带线、 第三谐振微 带线和第四谐振微带线， 第一谐振微带线与第二耦合微带线之间的间 距等于第三谐振微带线与第四耦合微带线之间的间距。 [Claim 2] The ring resonator-based band pass filter according to claim 1, wherein the ring resonator includes a first resonant microstrip line, a second resonant microstrip line, and a third resonant micro The strip line and the fourth resonant microstrip line, the spacing between the first resonant microstrip line and the second coupled microstrip line is equal to the spacing between the third resonant microstrip line and the fourth coupled microstrip line.
[权利要求 3] 根据权利要求 2所述的基于环形谐振器的带通滤波器， 其特征在于， 所述输入微带线与第一耦合微带线之间的间距等于所述输出微带线与 第三耦合微带线之间的间距。
根据权利要求 3所述的基于环形谐振器的带通滤波器， 其特征在于， 所述第一双枝节阻抗匹配器包括第一阻抗匹配线和第二阻抗匹配线， 所述第二双枝节阻抗匹配器包括第三阻抗匹配线和第四阻抗匹配线， 其中： 所述第一阻抗匹配线的一端与输入微带线的一端正交连接形成 L形， 第一阻抗匹配线的另一端连接至第二阻抗匹配线的一端； 所述 第三阻抗匹配线的一端与输出微带线的一端正交连接形成 L形， 第三 阻抗匹配线的另一端连接至第四阻抗匹配线的一端。 [Claim 3] The ring resonator-based band pass filter according to claim 2, wherein a spacing between the input microstrip line and the first coupled microstrip line is equal to the output microstrip line The spacing between the third coupled microstrip line. The ring resonator-based bandpass filter according to claim 3, wherein the first double-branch impedance matching device comprises a first impedance matching line and a second impedance matching line, and the second double-branch impedance The matching device includes a third impedance matching line and a fourth impedance matching line, wherein: one end of the first impedance matching line is orthogonally connected with one end of the input microstrip line to form an L shape, and the other end of the first impedance matching line is connected to One end of the second impedance matching line; one end of the third impedance matching line is orthogonally connected with one end of the output microstrip line to form an L shape, and the other end of the third impedance matching line is connected to one end of the fourth impedance matching line.
根据权利要求 4所述的基于环形谐振器的带通滤波器， 其特征在于， 所述第一阻抗匹配线和第三阻抗匹配线的长度均为 L 2=23.4mm、 宽度 均为 W 2=0.27mm， 第二阻抗匹配线和第四阻抗匹配线的长度均为 L , =21.64mm、 宽度均为 W ,=2.830^1。 The ring resonator-based band pass filter according to claim 4, wherein the first impedance matching line and the third impedance matching line have a length of L 2 = 23.4 mm and a width of W 2 = 0.27mm, the lengths of the second impedance matching line and the fourth impedance matching line are both L, =21.64mm, and the width is W, =2.830^1.
根据权利要求 5所述的基于环形谐振器的带通滤波器， 其特征在于， 所述第一谐振微带线和第三谐振微带线的长度均为 C n=23.48mm, 第 二谐振微带线和第四谐振微带线的长度均为 L 5=23.08mm， 第一谐振 微带线、 第二谐振微带线、 第三谐振微带线和第四谐振微带线的宽度 均为 W 5=0.25mm。 The ring resonator-based band pass filter according to claim 5, wherein the lengths of the first resonant microstrip line and the third resonant microstrip line are C n=23.48 mm, and the second resonant micro The lengths of the strip line and the fourth resonant microstrip line are both L 5 = 23.08 mm, and the widths of the first resonant microstrip line, the second resonant microstrip line, the third resonant microstrip line, and the fourth resonant microstrip line are both W 5 = 0.25 mm.
根据权利要求 6所述的基于环形谐振器的带通滤波器， 其特征在于， 所述输入端和输出端的长度均为 L。=15mm、 宽度均为 W。=1.66mm， 所述输入微带线、 输出微带线的长度均为 C 12=23.8mm、 宽度均为 Cw 2=0.14mm; 所述第一耦合微带线和第三耦合微带线的长度均为 C 12 =23.8mm, 所述第二耦合微带线和第四耦合微带线长度均为 C u =23.48mm， 所述第一耦合微带线、 第二耦合微带线、 第三耦合微带 线和第四耦合微带线的宽度均为 Cwl=0.17mm。 The ring resonator-based band pass filter according to claim 6, wherein the input end and the output end have a length L. =15mm, width is W. = 1.66mm, the length of the microstrip input line, the output of the microstrip line are C 12 = 23.8mm, width are 2 = 0.14mm Cw; coupling said first microstrip line and the third microstrip line coupled lengths are C 12 = 23.8mm, and the second coupling microstrip line length of the fourth coupled microstrip lines are C u = 23.48mm, coupled to said first microstrip line, the second coupling microstrip line, a first The widths of the three coupled microstrip lines and the fourth coupled microstrip line are both Cwl=0.17 mm.
根据权利要求 7所述的基于环形谐振器的带通滤波器， 其特征在于， 所述第一负载微带线和第三负载微带线的长度均为1^ 4=22.31^^ 宽度 均为 W 4=1.42mm， 第二负载微带线和第四负载微带线的长度为 L 3 =22.67mm、 宽度均为\¥ 3=0.915mm。 The ring-resonator-based bandpass filter according to claim 7, wherein the lengths of the first load microstrip line and the third load microstrip line are both 1^ 4 =22.31^^ W 4 = 1.42 mm, the length of the second load microstrip line and the fourth load microstrip line is L 3 = 22.67 mm, and the width is \¥ 3 = 0.915 mm.
根据权利要求 8所述的基于环形谐振器的带通滤波器， 其特征在于，
所述第一谐振微带线与第二耦合微带线之间的间距、 第三谐振微带线 与第四耦合微带线之间的间距均为 Cs 1=0.48η ιη, 所述输入微带线与 第一耦合微带线之间的间距、 输出微带线与第三耦合微带线之间的间 距均为 Cs 2=0.465mm。 A ring resonator-based band pass filter according to claim 8, wherein The spacing between the first resonant microstrip line and the second coupled microstrip line, and the spacing between the third resonant microstrip line and the fourth coupled microstrip line are both Cs 1 = 0.48 η ηη, the input micro The spacing between the strip line and the first coupled microstrip line, and the spacing between the output microstrip line and the third coupled microstrip line are both Cs 2 =0.465 mm.
[权利要求 10] 根据权利要求 1至 9任一项所述的基于环形谐振器的带通滤波器， 其特 征在于， 所述介质板是一种板厚为 0.762mm、 相对介电常数 3.66的 PC B板。
[Claim 10] The ring resonator-based band pass filter according to any one of claims 1 to 9, wherein the dielectric plate is a plate thickness of 0.762 mm and a relative dielectric constant of 3.66. PC B board.
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| CN115425377A (en) * | 2022-09-29 | 2022-12-02 | 河南科技大学 | Double-passband balance filter based on square ring loading |
| CN115425376A (en) * | 2022-09-29 | 2022-12-02 | 河南科技大学 | Double-passband filter based on branch knot loading |
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| CN206602160U (en) * | 2017-03-18 | 2017-10-31 | 深圳市景程信息科技有限公司 | Bandpass filter based on toroidal cavity resonator and double minor matters open-circuited loads |
| CN107026303B (en) * | 2017-03-18 | 2019-03-26 | 深圳市景程信息科技有限公司 | Bandpass filter based on toroidal cavity resonator |
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