Design and experimental verification of wire grid polarizer on dielectric substrate for quasi-optical network system
The quasi-optical network (QON) system generally requires that it has a feature of multi-frequency and multi-polarization for transmitting or receiving more channels in a small space to reduce the satellite load. The wire grid polarizer (WGP) can be mainly used into separating double different signals with horizontal polarization or vertical polarization. Due to its frequency irrelevant attribute, the most obvious advantage of WGP is that has much greater working bandwidth comparing with the frequency selective surface (FSS) during the millimeter wave (MMW) and sub-millimeter wave (sub-MMW) frequency. A novel WGP with a wide working band from 1MHz to 500GHz is presented and meanwhile measured from 75GHz to 325GHz in the BUPT, which is printed on the dielectric substrate. Its design principle and the analysis process of experimental data by the Time Domain Analysis technology are given simultaneously. The multipath and stray transmission components are analyzed and filtered to obtain the polarization isolation during the whole working bandwidth. What's more, the WGP is adopted into a dual-channel 3D quasi-optical network system (QON) to separate 183GHz and 324GHz. The experimental near-field planar results in the output position have also been obtained, which further demonstrates the validity of system design.