An S/C Dual-Band Dual-Polarization Array for Synthetic Aperture Radar

This paper proposes a dual-band dual-polarization array that operates in S-band (3 GHz) and C-band (5.3 GHz) which can be applied to Synthetic Aperture Radar (SAR) system. In this paper, a stacked dual-band dual-polarization microstrip patch antenna is designed as a radiating element, and then a dual-band dual-polarization array is formed by this element. The cross-polarization level of the dual-band array is suppressed by using the "pair-wise anti-phase" technique. A 2×2 prototype array is designed and simulated, and the proposed array covers the band of 2.94 GHz-3.06 GHz and 5.19 GHz-5.49 GHz. The polarization isolation is better than -16 dB in both bands. The cross-polarization is lower than -55 dB and -40 dB at S-band and C-band, respectively. The designed array has the characteristics of high aperture efficiency and symmetrical structure, which can be extended into a larger array.