Phase shifters with multiple independently controllable bands utilising frequency-selective variable gain networks

Johannes J.P. Venter, Tinus Stander

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A dual-band vector-sum phase shifter with independent phase control of the 2.4 and 5 GHz Wi-Fi bands is presented. The network uses band-limited variable gain amplification, with a broadband hybrid coupler at the input and an in-phase recombiner at the output. The circuit is prototyped on RF printed circuit board and exhibits performance characteristics comparable to the state-of-the-art single band vector-sum phase shifters. The prototype achieved an average gain of 2.16 dB over the 2.4 GHz band, with less than 0.26 dB and 1.32° root-mean-square (RMS) gain and phase error across all 2.4 and 5 GHz band tuning states. In the 5 GHz band, an average gain of 0.17 dB is achieved, with less than 0.21 dB and 3.88° RMS gain and phase error. The network's ability to generate bandindependent vector modulation over a 12 dB/90° tuning range is demonstrated as well, achieving less than 0.12 dB and 0.27° RMS gain and phase error in the 2.4 GHz band, and less than 0.27 dB and 2.94° gain and phase error in the 5 GHz band.

Original languageEnglish
Pages (from-to)143-153
Number of pages11
JournalIET Microwaves, Antennas and Propagation
Volume15
Issue number2
DOIs
Publication statusPublished - 2021
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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