Research on the Equivalent Circuit Model of the Three-Port T-Junction and Its Applications to High-Performance Branch-Line Coupler

TIAN Ge; YANG Jin-ping; SHI Sheng-cai; WU Wen

doi:10.3969/j.issn.0372-2112.2014.01.032

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Research on the Equivalent Circuit Model of the Three-Port T-Junction and Its Applications to High-Performance Branch-Line Coupler

更新时间：2025-07-16

- Research on the Equivalent Circuit Model of the Three-Port T-Junction and Its Applications to High-Performance Branch-Line Coupler
- Acta Electronica Sinica Vol. 42, Issue 1, Pages: 199-203(2014)
- 作者机构：
  
  1. 南京理工大学电光学院,江苏,南京,210094
  2. 中国科学院紫金山天文台,江苏,南京,210008
  3. 南京理工大学电光学院,江苏,南京,210094
  4. 中国科学院紫金山天文台,江苏,南京,210008
- 作者简介：
- 基金信息：
  
  Major Project supported by National Natural Science Foundation of China (No.11190012);Program of Jiangsu Province Key Fund (No.BK2011034);Innovation Orientation Program of the Chinese Academy of Science (No.KJXC2-EW-T05);Youth Fund of National Natural Science Foundation of China (No.11103087)
- DOI：10.3969/j.issn.0372-2112.2014.01.032
  CLC： TN802
- Published：2014
- 稿件说明：
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TIAN Ge, YANG Jin-ping, SHI Sheng-cai, et al. Research on the Equivalent Circuit Model of the Three-Port T-Junction and Its Applications to High-Performance Branch-Line Coupler[J]. Acta Electronica Sinica, 2014, 42(1): 199-203.
DOI：

TIAN Ge, YANG Jin-ping, SHI Sheng-cai, et al. Research on the Equivalent Circuit Model of the Three-Port T-Junction and Its Applications to High-Performance Branch-Line Coupler[J]. Acta Electronica Sinica, 2014, 42(1): 199-203. DOI： 10.3969/j.issn.0372-2112.2014.01.032.

摘要

本文提出一种基于导纳矩阵的三端口T型接头高精度超宽带等效电路参数提取方法.并将传统T型接头结构改进为凹-T型接头（concave）和凸-T型接头（convex）两种形式，以精确控制T型接头中心处寄生电容的影响.最后，在分析不同三端口T型接头连接方式对其等效电路及寄生电容影响的基础上，将改进后的T型接头结构用于研制一个中心频率12GHz高性能分支线耦合器.实测结果表明，在中心频率处该耦合器各端口的回波损耗和端口隔离度均小于-26dB，总插入损耗小于1.0dB，幅度差别小于0.1dB.

Abstract

In this paper

analysis of three-port T-junction based on the admittance matrix is presented.This method extracts parameters of the equivalent circuit model with high accuracy in ultra wideband.In order to control the effect of the parasitic capacitance

two improved T-junctions with concave and convex segments are proposed.The effect in the equivalent circuit model and parasitic capacitance due to different connection ways of three-port T-junction is also investigated.Then the improved T-junctions are applied to design a high-performance branch-line coupler with center frequency of 12GHz.The return loss and isolation are both better than -26dB at the center frequency

while the total insertion losses are below 1 dB and amplitude imbalance is within 0.1dB.

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