Compact Filtering Rat-Race Hybrid With Wide Stopband

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

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Author(s)

Detail(s)

Original languageEnglish
Article number7137686
Pages (from-to)2550-2560
Journal / PublicationIEEE Transactions on Microwave Theory and Techniques
Volume63
Issue number8
Online published26 Jun 2015
Publication statusPublished - Aug 2015

Abstract

This paper presents a novel method to design filtering rat-race hybrids with wide-stopband bandpass responses. Four ± K-inverters with bandpass functions are utilized to replace the one or three quarter-wavelength transmission lines in the conventional rat-race hybrid. The ± K-inverters consist of transmission lines and capacitors, which can reduce the area occupied and suppress the high-order harmonics. Furthermore, the isolation performance is enhanced by embedding the ± K-inverters. Theoretical analysis is carried out and design equations are derived. For demonstration, a filtering rat-race hybrid with bandpass responses is implemented. The center frequency is located at 470 MHz with the insertion loss of 1.2 dB. Good in-phase and out-of-phase characteristics are observed. Comparisons between the measured and simulated results are also presented to verify the theoretical analysis. The overall size is only 4.6% of the conventional hybrid and stopband is extended to 5f0.

Research Area(s)

  • Bandpass response, dual function, rat-race hybrid, size reduction, wide stopband

Citation Format(s)

Compact Filtering Rat-Race Hybrid With Wide Stopband. / Wang, Kai-Xu; Zhang, Xiu Yin; Zheng, Shao Yong; Xue, Quan.

In: IEEE Transactions on Microwave Theory and Techniques, Vol. 63, No. 8, 7137686, 08.2015, p. 2550-2560.

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