Design and development of broadband gap waveguide-based 0-dB couplers for Ka-band applications
Artikel i vetenskaplig tidskrift, 2022

The design and fabrication of a wideband millimetre-wave 0-dB coupler is proposed in this paper using gap waveguide technology for low-loss and high-power applications in 30-GHz frequency band. To overcome the fabrication challenges in millimetre-wave frequencies, the gap waveguide technique is utilised. Two gap waveguide-based coaxial- and waveguide-fed 0-dB couplers are designed with broadband performance, high return loss, acceptable coupling flatness and high isolation. For verifying the performance of the proposed structures, a prototype of the waveguide-fed 0-dB coupler is manufactured and measured. The measurement results show that the return and insertion losses and the isolation of the fabricated 0-dB coupler is better than 18 dB, 0.5 and 18 dB, respectively, in the specified frequency range from 26.2 to 34 GHz. Moreover, the breakdown power level of the proposed millimetre-wave structures is in kW orders to satisfy the high-power requirements.

millimetre-wave components

Gap waveguide

0-dB coupler



Davoud Zarifi

University of Kashan

Ali Farahbakhsh

Graduate University of Advanced Technology

Ashraf Uz Zaman

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

IET Microwaves, Antennas and Propagation

1751-8725 (ISSN)

Vol. 16 11 718-724





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