V-band millimeter-wave microstrip to rectangular waveguide transition

This article proposes a novel millimeter-wave microstrip (MSL) to WR 12 standard rectangular waveguide transitions. These dissimilar structures are interconnected via a substrate integrated waveguide (SIW). The MSL and the SIW are integrated on the same ceramic substrate of 9.9 relative permittivity and 125 m thickness. The MSL was first transformed into an air-filled rectangular waveguide, and then a stepped impedance or horn transformer was used to match the WR12 standard rectangular waveguide. The central frequency of operation is 61 GHz as required in V-band wireless communications applications. Commercial Finite Element Method Software and High Frequency Structure Simulator (HFSS) was used to perform the design and the optimization. The S parameter measurements of the back-to-back connected transitions show an insertion loss less than 1.5 dB and a return loss better than 10 dB over a 4 GHz band from 60 to 64 GHz. The high performance, the compact size, and the simple fabrication, enable similar transitions to be employed in a number of other millimeter-wave applications. (c) 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:16961700, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27658