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International Journal of Antennas and Propagation
Volume 2017 (2017), Article ID 8657620, 5 pages
Research Article

Design of a Compact Broadband 90° Waveguide Twist Based on Double-Corner-Cut Square Slots

National Digital Switching System Engineering and Technological R&D Center, Zhengzhou 450002, China

Correspondence should be addressed to Jun-mo Wu

Received 22 August 2017; Accepted 23 November 2017; Published 31 December 2017

Academic Editor: Toni Björninen

Copyright © 2017 Jun-mo Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A new compact broadband waveguide twist by double-corner-cut square slots is presented. In particular, the proposed module is made from two substrate layers and three copper cladding layers, which can be used as the waveguide twist and broadband filter. A double-corner-cut square slot is etched on each metal layer with relative rotation. It is found that the optimized module can provide the bandwidths of no less than 6.1% at the 10-dB return-loss level or 4.3% at the 20-dB level with a minimum length of 0.07 waveguide width.