A HBT-based quasi-circulator with wideband equalization technique

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

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Original languageEnglish
Pages (from-to)766-768
Journal / PublicationMicrowave and Optical Technology Letters
Issue number4
Publication statusPublished - Apr 2011


An innovative wideband equalization technique for use in a quasi-circulator is presented. The technique utilizes both gain and phase equalization, which provides wideband frequency operation with good return loss and isolation between ports. The circulator is realized by configuring three heterojunction bipolar transistors together with an equalizing phase shifter. Both theoretical analyses and experimental validations are performed. Experimental results show that it can operate over the frequency range 0.8-2.2 GHz. © 2011 Wiley Periodicals, Inc.

Research Area(s)

  • active circulators, quasi-circulators