A tri‐band complementary frequency selective surface with very closely spaced resonances

Abstract

This paper presents a tri‐band complementary frequency selective surface (CFSS) with very closely spaced bands and angular stability. The proposed CFSS element geometry is composed of double concentric rings. The choice of this geometry is because of its very good angular stability. The gap between resonance frequencies is very close, only 404 MHz from the first to second band and 202 MHz from the third to second, which is only possible because of the use of CFSS. The CFSS simulation is performed using HFSS software and the design used the equivalent circuit method. The simulated results are compared with the experimental ones for validation purposes. A very good agreement is observed between the simulated and measured results.

A dual‐band complementary frequency selective surface combining structures that provides narrow and wide stop‐band frequency responses

“…The frequency filtering property of the proposed CFSS remains practically unchanged for oblique incidence up to 45°. In addition, to measure angular stability of the proposed FSS, we used the methodology presented in da Silva et al 8 For the resonance frequency, the simulated results show that the 45° ratio is 1.04 for the resonance frequency and 0.98 for the bandwidth. The simulated results for horizontal polarization, are illustrated in Figure 3B.…”

“…Munk 7 shows that the square loop with the grid has good angular stability, while the crossed dipole does not. Thus, we propose to combine these geometries in one layer complementary frequency selective surface (CFSS), as this type of structure presents good angular stability 8‐11 . Our structure presents a narrow and a wide rejection band, with simple geometries, low profile, angular stability, and polarization independence.…”