A 3-D Wide Passband Frequency Selective Surface With Sharp Roll-Off Sidebands and Angular Stability

Abstract

In this letter, a 3D wide passband frequency selective surface (FSS) is proposed. Compared with planar wide passband FSSs, 3D structures usually present superior roll-off characteristics, especially under lower frequency. However, 3D wideband FSSs typically have greater insertion loss in the passband, and the transmission characteristic is sensitive to the angle of incident electromagnetic wave. The proposed FSS, by concurrently applying the design methods of planar FSSs and 3D FSSs, provides sharp double roll-off sidebands while maintaining excellent angular stability and low insertion loss in a wide passband. The simulation results show that the designed FSS can achieve a passband range from 5.86 GHz to 13.4 GHz with an insertion loss of less than 1 dB, and it can retain a stable transmission characteristic with the incident angle ranging from 0° to 45°. The proposed FSS is fabricated and measured in an anechoic chamber, and the measured results show that the fabricated FSS achieves a -3 dB passband from 5.33 GHz to 14.5 GHz. Under different incident angles ranging from 0° to 45°, the FSS also features the lower and upper roll-off transition bandwidths of 6.4% and 4.7%, respectively.

22/43 GHz low-insertion-loss dual-polarized multi-layer bandpass frequency selective surfaces for millimeter astronomy

“…In recent years, a large number of research groups have focused on three types of FSSs. The first type is the 3D FSS with multimode periodic elements [14][15][16] which can achieve a sharp roll-off by cascading multiple layers. However, their relatively large overall profiles impose limitations on their practical applications.…”

Bandpass frequency selective surfaces with fast roll-off characteristics

“…Based on the structure, the FSSs commonly employed in millimeter and submillimeter wave bands can be classified into three categories: single-layer [11][12][13][14][15][16], multi-layer [17][18][19][20][21][22], and 3D FSSs [23][24][25][26][27]. Due to the simplicity of production and analysis, single-layer FSSs are widely utilized, particularly in the design of sensors and conformal FSSs [28,29], wireless and satellite communication [30,31], radio telescope systems [12,32], etc.…”

“…3D FSSs offer a further dimension for design. In addition to offering the benefits of directed radiation, 3D FSS design can improve the directivity of antennas and significantly lower interference by boosting the component's height [27]. It is widely used in mobile communication, infrared sensing, and radar scattering cross section (RCS) [44][45][46] due to its outstanding roll-off performance and angular stability.…”

Low‐profile frequency selective surface with quasi‐elliptical bandpass response using antenna‐filter‐antenna approach

“…In Yu et al 21 the electrical and magnetic coupling paths are constructed with the help of the rectangular waveguide cavities, resulting in two transmission poles. Different from the above 3‐D FSSs, the 3‐D structure proposed in Wang et al 22 is composed of three layers of metallic patches connected by vertical wires. The simulation results exhibit attractive characteristics of double roll‐off sidebands.…”