Generative Adversarial Networks for Designing Single‐Layer Frequency Selective Surfaces With Ultra‐Wideband Parasitic Passband Rejection Characteristics

Parasitic passband rejection has always been a significant issue in the design of frequency selective surfaces (FSS), especially for bandpass‐type FSS that require ultra‐wideband cutoff characteristics. Conventional suppression methods, such as multilayer structures and miniaturization, can effectively suppress parasitic passbands. However, they are difficult to design, expensive to manufacture, and most importantly, their out‐of‐band suppression bandwidth is insufficient. To address these problems, an FSS with ultra‐wideband parasitic passband suppression effect using a single‐layer structure is proposed in this manuscript. First, the Wasserstein Divergence Generative Adversarial Network (WGAN‐div) is used to find various FSS units in the multi‐solution mapping domain. These FSS units generally have the same principal resonant frequency but different metal patterns. Then, an array of these units is created under the out‐of‐band energy homogenization constraint. Finally, the measurement results further demonstrate that the designed FSS operating at 3.5 GHz has a good out‐of‐band rejection beyond the operating frequency. In addition to the single‐layer structure, the proposed method also features cheap cost and low insertion loss.