A grooved metal ground with slits is utilized to achieve scattering cross section (SCS) reduction of a microstrip patch array antenna in this letter. By arranging the grooves and slits on the ground, 180° scattering phase differences between the elements on the ground and in the grooves are attained on the aperture, and obvious SCS reduction is obtained in a broadband. The proposed low-SCS microstrip patch array antenna is fabricated and measured in an anechoic chamber. Experimental results show that the proposed array antenna can scan up to ±60° in the E-plane and ±45° in the H-plane within the band of 10–10.6 GHz, and realizes a notable monostatic SCS reduction within the band of 7.8–13 GHz.

中文翻译：

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基于沟槽地面的低散射贴片阵列天线

带有沟槽的带槽金属地面可用于实现此微带贴片阵列天线的散射截面（SCS）减小。通过在地面上布置凹槽和狭缝，可以在孔径上在地面上的元素之间以及凹槽中的凹槽中获得180°的散射相差，并且在宽带中可以获得明显的SCS降低。拟议的低SCS微带贴片阵列天线是在消声室内进行制造和测量的。实验结果表明，提出的阵列天线可以在10–10.6 GHz频段内的E平面内扫描±60°，在H平面内±45°扫描，并在7.8频段内实现显着的单静态SCS减小–13 GHz。