Dual-broadband Linear-to-circular Polarizer Based on Antenna-filter-Antenna Unit Cell Structure
Linear-to-circular polarizers can play an important role in the antenna systems for satellite communications.In view of the requirements of K/Ka-band satellite communications,in this paper,a dual-broadband linear-to-circular polarizer is proposed,in which the antenna-filter-antenna(AFA)structure is adopted and the dual-band receiving and transmitting antennas are independent.In particular,the working bandwidth can be expanded by stacking the patches,resulting in a unit cell size of 0.4λK×0.37λK×0.27λK.With the polarizer,an incident x-polarized wave can be converted into a right-hand circular-polarized(RHCP)wave at the K-band,whereas an incident y-polarized wave can be converted into a left-hand circular-polarized(LHCP)wave at the Ka-band.A polarizer prototype is fabricated and tested.The measured results indicate that the operating bandwidth of the polarizer is 9.8%(18.3～20.2 GHz)and 7.8%(28.5～30.82 GHz)within the incidence angle ranging from 0° to 25°.
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