A Novel All‐Metal Tunable Broadband Frequency‐Selective Surface

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ABSTRACT In this study, we design an all‐metal tunable broadband frequency selective surface (FSS) that eliminates the need for lossy dielectric substrates and active devices requiring complex bias DC voltage‐based control circuits. The FSS is constructed from three cascaded all‐metallic plates, each comprising cells formed by uniting two concentric four‐arm substructures. Those cascaded configuration exploits multi‐order filtering to obtain broadband and independently controllable odd‐mode resonance to generate tunable bandpass response. The operating mechanism of the proposed FSS is analyzed and verified by the results from full‐wave simulation, equivalent circuit calculation, and mode‐related analysis. The measured and simulated results show that the structure can provide a tunable bandwidth range from 6.40 to 10.0 GHz, with a maximum bandwidth of 43%. Additionally, the FSS maintains low insertion losses and stable performance for both TE and TM polarization across a wide range of incidence angles.

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