A modified Jerusalem inspired bandpass FSS for multiband applications based on concentric ring slots

Abstract This paper presents the design of a multi-band planar bandpass Frequency Selective Surface with the novel rings and a modified Jerusalem cross integrated structure. To begin, the proposed FSS array geometry is defined by constructing a unit cell size of order of 0.57 λ0 × 0.57 λ0 where λ0 represents free-space wavelength of the first resonant frequency of the FSS periodic structure using novel concentric rings, leading to low profile design. The array structure is fabricated on the substrate material FR4 with a permittivity of 4.4 and having a thickness of 0.8 mm. Combination of concentric rings and Jerusalem Integrated Structure is examined. Low-profile, simpler design, improved angular and polarization stability are all benefits of the proposed FSS. The proposed FSS structure is designed to obtain a stable frequency response over entire Ku band. The simulated and experimental results are measured in a free space measurement setup, which indicate resonances at 12.39 GHz, 14.63 GHz, 16.11 GHz and 17.82 GHz, exhibits supported band pass frequency ratio 1.43 for Ku band applications. The simulated, equivalent circuit model and experimental results showed that the experimental results agree well with the simulated results for both TE (Transverse Electric) mode and TM (Transverse Magnetic) mode of polarization.