基于双SSLR的小型化双通带带通滤波器设计

孙久会; 张德伟; 周东方; 吕大龙; 刘庆

doi:10.11884/HPLPB201830.180172

基于双SSLR的小型化双通带带通滤波器设计

doi: 10.11884/HPLPB201830.180172

中国人民解放军战略支援部队信息工程大学信息系统工程学院, 郑州 450001

基金项目:

核高基重大专项 2013ZX01010003-004

详细信息

作者简介:
孙久会(1993—), 男, 硕士, 主要从事微波电路方向的研究; sjh109169@163.com

中图分类号: TN715
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- 被引次数: 0
出版历程
- 收稿日期: 2018-06-19
- 修回日期: 2018-09-27
- 刊出日期: 2018-11-15

Design of compact dual-band bandpass filter based on double short-circuited stub loaded resonators

National Digital Switching System Engineering and Technology R & D Center, Zhengzhou 450001, China

摘要

摘要: 设计了一种新的具有良好选择性的小型化的双模双通带带通滤波器。该滤波器的谐振结构由两个短路枝节加载谐振器(SSLR)连接到同一个接地金属柱构成。首先通过奇偶模分析方法分析单个SSLR的谐振频率，得到谐振频率的变化规律；然后为了实现滤波器的小型化，将两个SSLR连接到同一个金属柱上并且折叠微带线，通过调节枝节长度分析滤波器通带的变化；设计中使用双枝节分别对谐振器馈电的结构，并且引入了源与负载耦合，可以在上阻带多提供一个传输零点，以提高阻带抑制；最后对滤波器的传输零点进行分析，提高滤波器的选择性。通过上述的分析，对该滤波器进行仿真、加工以及测试，得到最后实物的测试结果与软件的仿真结果较为一致。
- 双模双通带带通滤波器 /
- 短路枝节加载谐振器 /
- 奇偶模分析法 /
- 小型化 /
- 源与负载耦合
Abstract: This paper presents the design of a novel dual-mode dual-band bandpass filter with good selectivity. The resonant structure of the filter consists of two short-circuited stub loaded resonators (SSLRs) connected to the same grounded metal column. Firstly, the resonant frequency of a single SSLR is analyzed by odd-/even-mode analysis method and the variation regulation of single SSLR resonant frequency is obtained. Secondly, in order to realize the miniaturization of the filter, two SSLRs are connected to the same metal column and then the microstrip line is folded, and the change in the passband of the filter is analyzed by adjusting the length of the branch. Thirdly, in the design, double-stub feeders are used to feed the two resonators separately and the source-load coupling is introduced, so that an additional transmission zero can be provided in the upper stopband to increase the stop-band suppression. Finally the transmission zeros of the filter are analyzed and the rules of variation are summarized to improve the selection characteristics of the filter. Based on this analysis, the filter is simulated, processed and tested, and the final physical measurement results are consistent with the software simulation results.
- dual-mode dual-band bandpass filer /
- short-circuited stub loaded resonator /
- odd/-even-mode analysis method /
- compact /
- source-load coupling

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图 1 SSLR的结构及其奇偶模等效电路

Figure 1. Structure of SSLR and its odd-/even-mode equivalent circuit

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图 2 奇偶模谐振频率f_e和f_o随θ₂的变化

Figure 2. Odd-/even-mode resonant frequencies f_e and f_o with varied θ₂

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图 3 两个SSLR通过金属柱连接的结构

Figure 3. Structure of double SSLRs connected by metal column

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图 4 频率响应随参数变化的规律

Figure 4. Frequency responses with varied parameters

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图 5 滤波器结构

Figure 5. Configuration of the filter

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图 6 零点随参数的变化

Figure 6. Variation of TZs with varied parameters

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图 7 滤波器的仿真及实物测试结果

Figure 7. Simulation and measured results of our filter

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表 1 与之前的SSLR双通带带通滤波器的比较

Table 1. Performance comparison with filters using SSLR

filter	center frequencies/GHz	3 dB FBW/%	TZ	circuit size
filter A^[5]	2.45/5.25	6.3/6.8	3	18%λ_g×13%λ_g
filter B^[5]	2.45/5.25	4.6/5.1	3	18%λ_g×14%λ_g
filter of Ref.[7]	2.4/5.2	7.6/3	5	27%λ_g×22%λ_g
filter of Ref.[8]	2.4/3.5	—/—	2	18%λ_g×17%λ_g
filter of Ref.[9]	1.52/3.5	—/7	5	21%λ_g×13%λ_g
this work	2.45/3.52	4.2/6.7	5	14%λ_g×11%λ_g
Note: λ_g is waveguide wavelength at central frequency of the first band.

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参考文献(10)

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