Design and analysis of ultrathin X‐band frequency selective surface structure for gain enhancement of hybrid antenna

Abstract

A wideband ultrathin frequency selective surface (FSS) structure is designed and developed for the complete X-band. The design employs a metallic tetra-arrow (two bidirectional arrows placed diagonally) and a circular split structure (metallic) in the top side and bottom side of RT duroid 5880LZ low-loss substrate respectively. The proposed design has novel contribution in terms of significant reduction in electrical thickness (0.007λ 0 which is corresponding to lowest operating frequency, 8.3 GHz) and wider transmission (S 21) bandwidth (measured: S 21 ≤ − 10 dB, 8.15-13.2 GHz, 47.3%), covering entire X-band due to cumulative loading of surface mount chip resistors in the top layer. The principle of operation of the proposed FSS further can be justified with its equivalent transmission line circuit model, which is based on microwave filter (band-stop and band-pass) topology for anticipating the desired characteristics. The FSS structure is further integrated with dielectric resonator (DR)-slot hybrid antenna for enhancing the gain (measured: peak gain of 4.5 dBi without FSS and 7.8 dBi with FSS) of the antenna. The proposed FSS structure is fabricated and measured performance has very similar responses as simulated ones.

Gain Enhancement Using Modified Circular Loop FSS Loaded With Slot Antenna for Sub-6 GHZ 5g Application

“…The maximum gain of the antenna with FSS is about 7.87 dB. Hence, the gain improvement of a slot antenna with a modified circular loop FSS is higher than those given by recently published articles[4,6,[8][9][10] with single and dual-layer FSSs, where other articles[5,7] used higher antenna size or double layer FSS. Gain enhancement comparison between proposed antenna and recently published FSS/metasurface papers.…”

“…Frequency selective surface (FSS) structure is used for gain, bandwidth enhancement and grating lobe reduction in microstrip antenna, which can reflect or pass the EM waves coming from the antenna. Several gain enhancement techniques have been investigated to enhance the properties of microstrip antenna such as artificial magnetic conductor (AMC) [5], metamaterial [1,6,13], single [8,10], and double-layer FSS [2,7,11]. In [1], a double split ring reflector based on mu-negative characteristic of the metasurface is used for gain enhancement.…”

“…In [8], the single-layer passband substrate integrated waveguide (SIW)-FSS is loaded to enhance the gain of a microstrip antenna whereas in [9] an FSS combined with a DRA is used for gain enhancement. In [10], double-side single layer FSS incorporated with chip resistor is used for gain enhancement of a DRA in X-band. Similarly in [11,12], a double-layer FSS reflector is designed for UWB applications, improving the gain effectively.…”

Dual rhombic loop‐based frequency selective surfaces for X‐band applications

“…23,24 The band stop FSSs with linear reflection phase behave as good reflectors and thus, these have been assembled with planar antennas to enhance their gain. 2,13 In this study, two different FSSs based on array of rhombic loop pair are proposed and experimentally validated to exhibit wide stopband at X-band frequencies. The polarization independent wide stopband FSS is formed by two orthogonally oriented layers of polarization dependent rhombic loop pairs printed on both sides of the substrate with nonlinear reflection phase.…”

Design of Polarization Insensitive Frequency Selective Surface for Electromagnetic Shielding Application

“…By the help of the frequency filtering property, FSS radome is transparent to the working frequency and is opaque to the frequency out of the frequency band [6,7]. This spatial filtering property of FSS is also useful for enhancing the gain of the antenna [8,9] and steering the beam in a particular direction [10]. Notably, for electromagnetic shielding applications, FSS based band stop filter effectively reduces electromagnetic interference [11][12][13].…”