Simulation and analysis of a dual-passband active tunable frequency selective structure

In order to meet the technical requirements of radar stealth, a dual-passband active tunable frequency selective structure (TDB FSS) is simulated. The antenna adopts a three-layer CLC composite structure and loads varactor diode branches to achieve two stable passbands, and the two resonance bands are effectively regulated by adjusting the PIN capacitance value. The full-wave electromagnetic simulation software was used to optimize the design and performance simulation of the structure. The simulation results show that the structure achieves two stable passbands near the 4.4 GHz and 12.6 GHz frequency points, and when the varactor diode capacitance changes from 0.1 pF to 1 PF, two adjustable passbands of 1.6 GHz to 4.4 GHz and 10.7 GHz to 12.6 GHz are formed, which realizes the independent regulation of the two passbands. The results show that the design scheme of dual-passband active tunable frequency selective structure proposed in this paper is feasible.