A Compact Miniaturized Frequency Selective Surface With Stable Resonant Frequency

Abstract

Abstract-A compact miniaturized frequency selective surface (FSS) with stable resonant frequency is proposed in this letter. The proposed FSS is composed of four spiral triangles connected in the middle of the unit cell, symmetrically. Simulated results show that the dimension of the element is only 0.0558λ 0 × 0.0558λ 0 , and reduction in FSS size is up to 97.7% with respect to conventional cross-dipole FSS operating at the same frequency of 2.7 GHz. Also, the proposed FSS has great angular stability, and the resonant frequency deviation keeps below 0.4% for both TM and TE polarizations of 60 • incident angle.

Design of Compact Polarization Insensitive Triple Bandstop Frequency Selective Surface with High Stability under Oblique Incidence

“…In order to comprehend the novelty of the proposed structure, it is compared with previously reported bandstop FSS [8][9][10][11][12][13][14][15][16] and the results are tabulated in Tab. 2.…”

“…Frequency selective surfaces (FSS) have attracted the attention of researchers for their variety of electromagnetic (EM) properties which include their use as bandstop and bandpass filters [1], [2], artificial magnetic conductors [3], polarization converters [4] and reactive impedance surfaces [5]. The FSS structures exhibiting bandstop filter characteristics find applications in EM shielding, antenna beam shaping and reflector antennas [6][7][8]. Since, EM waves are subject to multipath propagation and FSS structures cannot be always put perpendicular to the incident EM waves, stable and unperturbed response is necessary for bandstop FSS under oblique incidence.…”

A miniaturized FSS based on tortuous structure design

“…From the comparisons, it can be observed that sharper one-side roll-off characteristic and better angular stability can be obtained with the proposed FSS structure with a larger tortuous factor. It is should point out that structures in [7] and [8] are proposed to realize a band-stop miniaturized FSS. Hence, their complementary patterns are adopted in our work to realize a band-pass characteristic and to demonstrate the performance of our proposed FSS structure.…”

“…Its resonant frequency can be adjusted by changing the tortuous factor of cross-dipole element. And, compared with the miniaturized FSS structures proposed in [7,8,9, 10], the proposed FSS has a sharper one-side roll-off characteristic and a better angular stability characteristic. Also, by cascading the proposed FSS with different tortuous factors, a dual-band frequency filter property can be obtained.…”

A feasible bandwidth compensation technique for FSS radome design

“…Actually, stable frequency filter of FSS radome can be obtained by improving the stability of resonant frequency and bandwidth, simultaneously. The resonant frequency stability can be obtained by miniaturised FSSs [5,6,7,8,9,10,11] and the bandwidth stability can be improved by bounding outer compensation layers with a lower permittivity [1]. However, when fabricating the bandwidth compensation layers, mechanical suitable materials with such a lower permittivity may be not available in engineering.…”