科研之友
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摘要
A novel tri-band frequency selective surface (FSS) is proposed by using multi-layer printed circuit boards with a number of via holes. Three separate propagation paths with two stepped-impedance resonators (SIRs) and a uniform-impedance resonator (UIR) are constructed in each unit cell of the proposed FSS, thus leading to tri-band bandpass performance. The lowest and the middle frequency bands are achieved by two SIRs, respectively, and the highest frequency band is obtained by the resonance of the UIR. Therefore, these three passbands can be realised independently, which can increase the design freedom. The operating principle is explained by analysing the electric field distributions. To verify the design concept, a prototype of the proposed FSS is simulated and tested. Measured results show that the FSS features stable tri-band performance under a large variation of incident angle.
