Abstract
Free stand wire-grids (FSWG) are widely used as polarizers, beam splitters, attenuators, and interferometers in millimeter wave and THz ranges. FSWG behaves as low-loss element as the wire grid is unsupported with a substrate, and provides good performance in the range of 0.1-3.0 THz. This paper analyzes the characteristic of the wire-grid polarizers in sub millimeter wave range. These analysis include the spectral transmittance with different wire spacing and incident angle. In order to evaluate the analysis, we measured the transmittance of wire-grid polarizer by using a novel quasi-optical system. Test results of transmittance show that the extinction ratio is over 15 dB up to 700GHz, which agrees well with predictions.
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