Abstract
This paper presents a low radar cross section (RCS) transmitarray with absorption-transmission-absorption frequency response. In contrast to conventional transmitarrays based on multi-layer metallic patterns, a 2.5-dimensional cross polarization converter is employed to provide a large phase shifting range of high transmission efficiency. A benchmark transmitarray composed of the polarizer element with an aperture thickness of 2.3 mm (0.08λ) is designed to achieve a focused radiation beam. As a result, its peak gain is 22.1 dB and maximum aperture efficiency is 57.6%. Next, a low-RCS transmitarray is designed by introducing a lossy layer to absorb the out-of-band incident waves. Compared with the benchmark antenna, the radiation performance of the low-RCS transmitarray is maintained with a peak gain of 21.7 dB and maximum aperture efficiency of 53.7%. Meanwhile, dual-polarized significant RCS reduction can be obtained at both lower and higher frequencies.
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