Broadband Circularly Polarized Phased Array and Van Atta Retrodirective Array

The paper proposes a wideband circular polarized (CP) antenna, its phased array and Van Atta array. Broad impedance bandwidth and axial ratio bandwidth can be realized through the adoption of multilayer structures and slotting techniques in the patch antenna design. The developed circular polarized antenna operates at 5.6GHz achieving 16% impedance matching range and 8.3% AR (axial ratio) bandwidth. The corresponding phased array exhibits a 3dB scanned beamwidth of ±51 o. The proposed Van Atta retrodirective array exhibits a 5-dB beamwidth of 95° in monostatic radar cross-section (RCS) performance.