Title :
A W-Band Polarization Converter and Isolator
Author :
Dietlein, Charles ; Luukanen, Arttu ; Popovic, Zoya ; Grossman, Erich
Author_Institution :
Colorado Univ., Boulder
fDate :
6/1/2007 12:00:00 AM
Abstract :
A 95-GHz printed low-loss linear-to-circular polarizer is designed as a component of an active direct-detection millimeter-wave imaging system. The periodic printed grid structure presents different reactances to the TE and TM polarizations, resulting in equal amplitude and phase quadrature upon transmission through four parallel grids. The polarizer is measured in both a Gaussian beam system and a plane wave system, and demonstrates an axial ratio of 0.23 dB, polarization isolation of 38 dB, and transmission loss of 0.3 dB for normal incidence. The quarter-wave plate is characterized up to plusmn35deg off the optical axis, and exhibits an axial ratio better than 1 dB up to plusmn17deg off the optical axis.
Keywords :
electromagnetic wave polarisation; electromagnetic wave transmission; microwave isolators; millimetre wave devices; millimetre wave imaging; Gaussian beam system; TE polarization; TM polarization; W-band isolator; W-band polarization converter; active direct-detection millimeter-wave imaging system; frequency 95 GHz; linear-to-circular polarizer; periodic printed grid structure; plane wave system; polarization isolation; quarter-wave plate; transmission loss; Extraterrestrial measurements; Isolators; Lenses; Millimeter wave measurements; Millimeter wave technology; NIST; Optical imaging; Optical polarization; Optical retarders; Optical sensors; Millimeter wave devices; millimeter wave imaging; polarization;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2007.898595
