A multi-functional frequency selective polarization converter based on substrate integrated waveguide cavities

Abstract

In this paper, a multi-functional frequency selective polarization converter (FSPC) based on the substrate integrated waveguide cavities (SIWC) is presented. The proposed structure is based on a circular shape SIWC with orthogonal rectangular slots on the top/bottom layer of each unit cell. The neighboring SIWC are connected to each other by metalized vias which formed a shared diamond shape cavity. Two cross shape slots serve as additional input and output channel for the shared SIW cavity. The novel design introduces more functions to the device. When the device acts as a frequency selective surface, it provide two transmission window around 8.52 and 13 GHz. It can also realize cross-polarization conversion between TM and TE polarized waves from 15.87 to 17.01 GHz as well as narrowband polarization conversion around 10.33 GHz. The working mechanism of proposed design has been explained through the analysis of the surface current distribution. In order to verify the performance of the design, a prototype was manufactured and measured, the simulated and measured results are highly consistent with each other.