Structure improvement of tapped-line in microstrip interdigital filter

Shu-wen WEN; Yang GAO; Da-peng ZHANG

doi:10.3788/OPE.20182609.2261

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Structure improvement of tapped-line in microstrip interdigital filter

更新时间：2020-08-13

- Structure improvement of tapped-line in microstrip interdigital filter
- Optics and Precision Engineering Vol. 26, Issue 9, Pages: 2261-2268(2018)
- 作者机构：
  
  1.西南科技大学信息工程学院, 四川绵阳 621010
  2.中国工程物理研究院电子工程研究所, 四川绵阳 621999
  3.中国科学院高能物理研究所核探测与核电子学国家重点实验室, 北京 100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20182609.2261
  CLC： TN631.2;TN713
- Received：18 May 2018，
  
  Accepted：02 July 2018，
  
  Published：25 September 2018
- 稿件说明：
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Shu-wen WEN, Yang GAO, Da-peng ZHANG. Structure improvement of tapped-line in microstrip interdigital filter[J]. Optics and precision engineering, 2018, 26(9): 2261-2268.
DOI：

Shu-wen WEN, Yang GAO, Da-peng ZHANG. Structure improvement of tapped-line in microstrip interdigital filter[J]. Optics and precision engineering, 2018, 26(9): 2261-2268. DOI： 10.3788/OPE.20182609.2261.

摘要

使用耦合谐振电路理论设计微带交指滤波器具有较好的灵活性，然而当衬底厚度和中心频率增加到一定程度时，由传统的50 Ω抽头线得到的外部品质因数

达不到理论值。为了增大实际设计中的

，同时匹配源和负载，本文将传统的抽头结构改进为一段50 Ω微带线与一段较细微带线组合的类SIR抽头；此外，为了减小微带线阶跃变化带来的回波损耗，将类SIR抽头改进为一段50 Ω微带线与一段较细微带线渐变式过渡的抽头。最终，分别采用类SIR抽头和渐变式抽头设计了一个Ka波段微带交指滤波器。仿真表明：使用类SIR抽头和渐变式抽头得到的

都能与理论值相匹配，且带渐变式抽头的滤波器相比于带类SIR抽头的滤波器，其回波损耗减小8.31 dB，插入损耗减小0.16 dB。从而验证了所提出的两种抽头结构改进的可行性。

Abstract

According to the theory of coupled resonant circuits

the design of the microstrip interdigital filter is quite flexible. However

when the substrate thickness and the center frequency increase to a certain value

the external quality factor

cannot reach the theoretical value when using the traditional 50 Ω tapped-line. In order to increase the

in the actual design and match the source and load

the traditional tapped-line structure was improved to an SIR-like tapped-line

with the combination of a 50 Ω microstrip line and a narrower microstrip line. To reduce the return loss caused by the step change of the microstrip line

the SIR-like tapped-line was improved to a gradual tapped-line with the combination of a 50 Ω microstrip line and a narrower microstrip line. Then

taking a Ka-band filter as an example

the microstrip interdigital filter was designed by using the SIR-like tapped-line and the gradual tapped-line

respectively. The simulation indicates that both the

of the SIR-like tapped-line and the gradual tapped-line can match the theoretical values. In addition

compared with the filter with the SIR-like tapped-line

the return loss of the filter with a gradual tapped-line is reduced by 8.31 dB

and its insertion loss is reduced by 0.16 dB. The feasibility of the proposed two kinds of tapped-line structure improvement is verified.

关键词

Keywords

references

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