A miniaturized-element bandpass frequency selective surface using meander line geometry

摘要

In this paper, a low-profile miniaturized-element frequency selective surface ( FSS) is presented numerically as well as experimentally. The proposed design consists of a meandered pattern printed on both sides of an ultra-thin ( 0.0005 lambda(0)) FR-4 substrate, which exhibits a bandpass characteristic at 750 MHz having unit cell dimensions of 0.017 lambda(0) X 0.017 lambda(0). The structure, being asymmetric in nature, selectively realizes bandpass operation for a specific polarization, whereas transmits incident wave for other polarizations. The novelties of the design lie in its miniaturization performance as well as ultra-thin profile as compared with the earlier reported structures. The proposed structure has further been analyzed through deriving equivalent circuit models and parametric variations. Finally, a prototype of the FSS is fabricated and the measured response is in good agreement with the simulated result under normal incidence.