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A W-band polarization converter and isolator



Charles Dietlein, A. Luukanen, Zoya Popovic, Erich N. Grossman


This paper presents a 95-GHz printed low-loss linear-to-circular polarizer designed as a component of an active direct-detection millimeter-wave imaging system. The periodic printed structure presents different reactances to the TE and TM polarizations, resulting in equal amplitude and phase quadrature upon transmission through four parallel gratings. 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 ±35 degrees} off the optical axis, and exhibits an axial ratio better than 1 dB up to ±17 degrees} off the optical axis.
IEEE Transactions on Microwave Theory and Techniques


millimeter wave devices, millimeter wave imaging, polarization


Dietlein, C. , Luukanen, A. , Popovic, Z. and Grossman, E. (2007), A W-band polarization converter and isolator, IEEE Transactions on Microwave Theory and Techniques, [online], (Accessed April 14, 2024)
Created June 5, 2007, Updated October 12, 2021