Design and Application of Aperture-Coupled-Patch Frequency Selective Surfaces

In this paper, the theories, features, and design methods to the aperture-coupled-patch frequency selective surfaces (FSSs) were discussed. A novel wide bandwidth FSSs and a kind of multi-bands FSSs with reduced geometry were designed in this paper due to the theory we introduced. Based on the FSSs proposed in this paper, a 24-GHz flat lens antenna was designed as an application example to certify the theory. A prototype of lens antenna was fabricated and measured, and measurement results well agree with the calculated ones.