Minimized multi‐layer substrate integrated waveguide 3‐dB small aperture coupler

Abstract

AbstractA multi‐layer 3‐dB substrate integrated waveguide coupler is presented in this article. As a promising technique, the multi‐layer substrate integrated waveguide has been widely used in microwave and millimeter circuits and systems for its decrease in size. This design combines the Bethe hole coupling theory with the SIW technology to reduce the height and integrate with other planar circuits. More importantly, the strong coupling (3‐dB) coupler presented in this article utilizes the higher frequency band of TE10 mode to get a relatively bigger radius of aperture and in turn reduce the number of coupling sections, which significantly decrease the size of the coupler. The simulated results are in good agreement with the measured data.