Millimetre wave wideband low‐loss waveguide‐to‐substrate integrated waveguide transition

Abstract

A wideband Ka‐band waveguide‐to‐substrate integrated waveguide transition is presented based on a multi‐section transformer approach. We designed our transition by successfully adapting multi‐section inhomogeneous waveguide transformer theory to match a substrate integrated waveguide feedline to a standard waveguide flange, which offers more degrees of freedom than current design methods in the state of the art. We subjected our transition to a simulated tolerance analysis and have found the transition to be robust when fabrication errors are considered. We validated these simulations by measuring a back‐to‐back waveguide‐to‐substrate integrated waveguide transition, where there is very good agreement between measured and simulated results. Moreover, an insertion loss of −0.48 dB was measured at the center frequency of the required operating range. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:10–12, 2017

Millimetre wave SIW diplexer circuits with relaxed fabrication tolerances

“…Additionally, the diplexer is excited using a WG-to-SIW transition where the ports on the diplexer are matched to a standard WG 22 flange. The design of the WG-to-SIW transition is detailed in [18] Fig. 12 Simulated lossless and measured performance of the SIW diplexer using a WG-to-SIW transition Fig.…”

A low‐loss Ka‐band waveguide to substrate integrated waveguide transition based on ridged stepped‐impedance transformer

“…It also benefits from cheap fabrication costs and low profile. To synergise the strengths of air-filled waveguides and SIW, the transition between these two different structures is in great demand and several works have been reported in the literature [1][2][3][4][5][6][7]. However, the presented transition structures still suffer from large insertion losses (>0.8 dB) at Ka-band, which is intolerable in SatComs applications.…”