Frequency Controlled Polarization Rotating Transmitarray for Polarimetric Radar Applications

2022 52nd European Microwave Conference (EuMC)

Abstract

Polarization rotating transmitarrays can be used for enabling the detection of polarimetric scattering effects with radar systems. This work presents a compact Ka-band antenna-filter-antenna (AFA) unit cell design containing a 5th-order planar interdigital diplexer and three patch antennas for orthogonal polarizations. Thus, the linear polarization incident by a frequency modulated radar system can be preserved or rotated by 90° depending on the instantaneous frequency. The proposed transmitarray is developed for multilayer printed-circuit board fabrication with RO3003 layers composed with RO4450T bondply. Simulations are performed that include losses and copper surface roughness. The design exhibits 25 dB polarization separation and sufficiently low input return loss with a relative bandwidth of 11.4% at the radar layer and within two closely spaced bands with a relative bandwidth of 4.9% at the target layer.

Authors 3

1. Tim Freialdenhoven

   Fraunhofer Institute for High Frequency Physics and Radar Techniques

   Affiliation as printed

   Fraunhofer Institute for High Frequency Physics and Radar Techniques FHR, Research Group Aachen,Germany

   Fraunhofer Institute for High Frequency Physics and Radar Techniques FHR, Research Group Aachen, Germany

2. Maurice B. Schepers Aachen Institute of High Frequency Technology IHF

   RWTH Aachen University

   Affiliation as printed

   Institute of High Frequency Technology IHF, RWTH Aachen University,Germany

   Institute of High Frequency Technology IHF, RWTH Aachen University, Germany

3. Thomas Dallmann

   Fraunhofer Institute for High Frequency Physics and Radar Techniques

   Affiliation as printed

   Fraunhofer Institute for High Frequency Physics and Radar Techniques FHR, Research Group Aachen,Germany

   Fraunhofer Institute for High Frequency Physics and Radar Techniques FHR, Research Group Aachen, Germany