Broadband Polarizer Miter Bend for High Power Radar Applications

Abstract

Polarizer miter bends are used to alter the polarization in overmoded waveguides. For future space debris observation with broadband high power W-band radar sensors these are important transmission line components. A polarizer miter bend uses a grooved mirror as phase grid for polarization. The present paper address a suitable design of such a phase grid for broadband radar applications within the frequency range from 90 GHz to 100 GHz. An appropriate parameter combination is found by a parametric study. For reduction of the required amount of calculation a plane wave approximation and unit cell simulations are used. With a suitable parameter combination a cross polarization of Xpol <= -26 dB can be achieved within the considered frequency range. This corresponds to a suitable value for radar applications.