Modelling of ultra‐wide stop‐band frequency‐selective surface to enhance the gain of a UWB antenna

Abstract

Here, an ultra‐wide stop‐band single‐layer frequency‐selective surface (FSS) with high‐incidence angle independence has been proposed to enhance the gain of an ultra‐wideband (UWB) monopole antenna. The unit cell (0.2λ × 0.2λ) of the proposed FSS consists of four asymmetric rectangular patches with circular slots embedded in it. This concept of four slotted patches is conceived to achieve ultra‐wide stop‐band characteristic over 4.7–14.9 GHz. An equivalent lumped circuit model for the FSS is proposed to provide insight into the working nature of the FSS. A UWB monopole antenna is also designed and integrated with the proposed FSS. Ultra‐wide stop‐band single‐layer FSS converts the omnidirectional pattern of the monopole antenna into a unidirectional one and thereby registers a significant increase in its gain by 4.5 dBi. The design concept has been discussed and experimentally verified using simulated and measured results.

A compact uniplanar ultra‐wideband frequency selective surface for antenna gain improvement and ground penetrating radar application

“…Owing to its diverse merits, several researches are going on now a days to design and develop application specific FSS to fulfill its applicability in various modern applications such as electromagnetic shielding, 2 polarizers, 3 absorbers, 4 RFID, 5 cloaking, 6 radomes, 7 reduction of radar cross section 8 and satellite communication 9 . One more modern use of FSS can be noted as antenna gain augmentation when it is integrated to the antenna 10‐21 . Design of wideband FSS 11‐21 finds special research attention as broadband and ultra‐wideband (UWB) antennas offer usually low gain profile 22 .…”

“…One more modern use of FSS can be noted as antenna gain augmentation when it is integrated to the antenna 10‐21 . Design of wideband FSS 11‐21 finds special research attention as broadband and ultra‐wideband (UWB) antennas offer usually low gain profile 22 . An exceptional gain enhancement of 8 to 10 dBi is realized in the frequency band of 4.5 to 6.5 GHz in Reference 10 using FSS based corner reflector.…”

“…Mondal et al designed a patch type UWB FSS for gain augmentation of compact UWB monopole antenna 19 . Das and Mandal proposed UWB FSS whose unit cell contains multiple non‐symmetric rectangular patches with circular slots to offer gain augmentation of UWB antenna in a wide bandwidth of 4.7 to 14.9 GHz 20 . Abdulhasan et al proposed a compact single layered UWB FSS that offers 3.2 to 11.3 GHz bandwidth and UWB antenna gain improvement by 3.5 dBi on an average 21 .…”

Compact ultra‐wideband antenna: improvement of gain and FBR across the entire bandwidth using FSS

“…However, the size of the composite FSS integrated antenna structure gets increased to twice the size of the original antenna. A wide band FSS is used to enhance the gain of an antenna along with parasitic patch, which also increase the size of the basic antenna [27].…”

Miniaturized and Flexible FSS-Based EM Shields for Conformal Applications

“…The reported design offers a narrowband reflective and transmissive response over Ku-band satellite and Ku-band active radars respectively. An ultra-wide stop-band single-layer FSS is reported in [26] to enhance the gain of an Ultra-Wideband (UWB) monopole antenna. The unit cell of the reported FSS consists of four asymmetric rectangular patches with circular slots embedded in it.…”