Design of Linear-to-Circular Polarized Reflectarray Antenna Using Dual-polarized Decoupled Metasurface Unit
Based on the method of polarization separation of the metasurface structure,a dual-polarized wideband decoupled metasurface element with novel periodic structure is proposed,and both of the sub cells can achieve almost independent and continuous phase with 360° full coverage modulation at 25～35 GHz.Based on this,an offset-feed linear-to-circular polarized reflectarray antenna is designed to operate in Ka-band,and the test results show that the array can operate at 27～34 GHz with a maximum gain of 30.7 dBic,the aperture efficiency of 46.91％and a 3 dB axial-ratio bandwidth of 23.47％.The dual-polarization decoupled metasurface unit has a simple structure,wide operating bandwidth,high aperture efficiency with the side-lobe levels lower than-22 dB,which has great potential for the application of low-cost metasurface reflectarrays.The proposed dual-polarization decoupling method has a guiding value in current low-cost metasurface applications.
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维普
