Balanced Rat-Race Couplers with Wideband Common-Mode Suppression

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Wenjie Feng
  • Wenquan Che
  • Yongrong Shi
  • Roberto Gómez-García
  • Chenxu Wang
  • Quan Xue
  • Xiuyin Zhang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Number of pages9
Journal / PublicationIEEE Transactions on Microwave Theory and Techniques
Early online date29 Oct 2019
Publication statusE-pub ahead of print - 29 Oct 2019

Abstract

In this article, various types of six-port balanced rat-race couplers with wideband common-mode suppression characteristics are presented. In these couplers, the input and output ports can functionalize either as single-ended or differential terminals to realize different operational modes. The power-splitting ratio for these balanced couplers can be flexibly adjusted by means of the values of the characteristic-impedance parameters of their constituent transmission-line segments. Furthermore, the employment of double-sided-parallel-strip-line-(DSPSL)-based 180° phase inverters instead of half-wavelength transmission-line-based ones allows for the considerable enlargement of their operation bandwidth in more-compact circuits with lower in-band insertion-loss levels. For experimental-validation purposes, two microstrip prototypes at ƒ= 0.9 GHz with equal and unequal power division are fabricated and characterized. They exhibit common-mode rejection levels higher than 15 dB from 0 to 1.8 GHz (i.e., 0-2ƒ0) and differential-to-common- mode-conversion suppression levels above 15 dB within the spectral range 0-1.49 GHz (i.e., 0-1.65ƒ0).

Research Area(s)

  • Balanced couplers, differential/common mode, double-sided parallel-strip-line (DSPSL), phase inverter, rat-race couplers, single-ended-to-balanced circuit, six-port circuits, wideband circuits

Citation Format(s)

Balanced Rat-Race Couplers with Wideband Common-Mode Suppression. / Feng, Wenjie; Che, Wenquan; Shi, Yongrong; Gómez-García, Roberto; Wang, Chenxu; Xue, Quan; Zhang, Xiuyin; Zhou, Xinyu.

In: IEEE Transactions on Microwave Theory and Techniques, 29.10.2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review