Quasi-corrugated substrate integrated waveguide H-plane horn antenna with wideband and low-profile characteristics

Abstract

A wideband H-plane horn antenna based on quasi-corrugated substrate integrated waveguide (SIW) technology with a very low profile is presented in this article. Open-circuited microstrip stubs are applied to create electric sidewalls of the quasi-corrugated SIW structure. The quasi-corrugated SIW H-plane horn antenna shows high performance and simple structure. A specify-shaped horn aperture is utilized, so that the poor impedance matching owing to the structure restriction can be smoothened. The structure is simulated by ANSYS HFSS and a prototype is fabricated. The measured results match well with the simulated ones. An enhanced impedance bandwidth ranging from 5.3 GHz to 19 GHz (VSWR < 2.5) is achieved. The presented antenna also brings out stable radiation beam over the same frequency band.