Abstract: A novel dual polarization microstrip patch element and its array are proposed. The element is fed through two orthogonal H shaped slots with high isolation. The measured isolation is better than 42 dB in an operation bandwidth of 8.8～9.8 GHz. As a sub array for SAR applications, the feed network of an array consisting these elements has a simple configuration. An eight element linear array has been designed and fabricated. Experimental results are in good agreement with the theory, with high isolation (>30 dB) and low cross polarization characteristics (<-32.5 dB).

Key words: aperture coupled, arrays, dual polarization, isolation, microstrip antenna