A 60 GHz-Band 4×4 Butler Matrix Based on Ridge Gap Waveguide
Paper in proceeding, 2022

A 4×4 butler matrix based on ridge gap waveguide (RGW) is presented for 60 GHz applications. The proposed Butler matrix consists of four ridge gap waveguide-based couplers, a cross-over and four phase shifters. The simulation results show that return loss and isolation of the Butler matrix are better than 15 dB. Also, power-split imbalance of ±1 dB and phase error of ±7° is achieved over the bandwidth of 59-61 GHz. This wideband Butler matrix design can play a great role while designing wideband beam forming feed network, comparator network etc. for the antenna arrays at millimeter-wave frequencies.


gap waveguide

low sidelobe level


D. Zarifi

University of Kashan

A. Farahbakhsh

Graduate University of Advanced Technology

Ashraf Uz Zaman

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

2022 16th European Conference on Antennas and Propagation, EuCAP 2022

9788831299046 (ISBN)

16th European Conference on Antennas and Propagation, EuCAP 2022
Madrid, Spain,

Subject Categories


Communication Systems

Signal Processing



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6/9/2022 1