Abstract
This work is dedicated to designing high-performance microwave absorbers that meet the pressing needs for advanced stealth materials, which are controllable, ultra-thin, transparent, and ultra-wideband. Consequently, we propose two transparent ultra-wideband microwave absorbers based on 1-bit encoded optimization in this study. We analyze the absorption mechanisms of these two coded absorbers, emphasizing their complementary bandwidth properties. Among them, the Chinese character "Mi" structure encoded absorber achieves an absorption rate exceeding 90 % within the frequency range of 15.7 to 49.4 GHz, with a fractional bandwidth being only 0.07 times its upper cutoff wavelength. This absorber demonstrates remarkable stability under varying incident angles and maintains polarization insensitivity. It sustains an approximate 80 % absorption rate as the incident angle varies from 0°–60°. Finally, fabricated test samples exhibit absorption performance consistent with simulations across the 10–40 GHz frequency range, thereby validating the effectiveness of the proposed design.
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