A New Narrow Band Frequency Selective Surface Geometry Design at the Unlicensed 2.4‐GHz ISM Band

Abstract

Wireless devices in the unlicensed instruments, scientific, and measurements (ISM) bands cause mutual interference in indoor environments. This interference degrades the system performance and compromises security. Transforming existing building walls to a band stop frequency selective surface (FSS) can be an efficient solution for such problems. This work is proposed to design FSS for interference mitigation and network security within the buildings in the unlicensed 2.4‐GHz ISM band and to provide maximum transparency at broadcast frequencies. A 2.4‐GHz ISM band is a relatively narrow band which cannot be met by a conventional FSS for a wide range of incidence angle. Whereas wireless signals in indoor environment have a wide range of incidence angle. To obtain the desired narrow band response, a new FSSs element geometry is introduced which has a stable frequency response for TE polarization when the angle of incident wave is varied from 0° to 70°. HFSS software is used for simulation and design purposes. The obtained simulation and measurement results show that desired frequency response is achieved for TE polarization successfully. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2986–2990, 2013

The novel frequency selective fabric and application research

“…Here, the transmission line equivalent circuit method is used to further analyse the transmission characteristic aiming at the specific patch FSF, and the principle also applies to aperture FSF. Figure 10(a) gives the schematic plan of patch FSF, in which relevant geometric parameters are marked and Figure 10(b) shows the corresponding transmission line equivalent circuit, which consists of a series RC circuit modelling the conductive patch FSS layer shunted across the short-circuited transmission line of length d modelling the dielectric fabric [23,24].…”

Dual‐band miniaturised FSS with stable resonance frequencies of 3.4/4.9 GHz for 5G communication systems applications

“…For example, FSS has many applications in radomes, antenna reflectors, electromagnetic shielding and wireless communication systems. Especially, FSS plays an important role in selecting specific frequency communications, protecting wireless system security, suppressing band interference in neighbouring wireless networks and prevent the leakage of the signal [6,7]. In [6], a designed FSS for interference mitigation and network security within the buildings in the unlicenced 2.4 GHz industrial, scientific and medical (ISM) band and to provide maximum transparency at broadcast frequencies.…”

“…Especially, FSS plays an important role in selecting specific frequency communications, protecting wireless system security, suppressing band interference in neighbouring wireless networks and prevent the leakage of the signal [6,7]. In [6], a designed FSS for interference mitigation and network security within the buildings in the unlicenced 2.4 GHz industrial, scientific and medical (ISM) band and to provide maximum transparency at broadcast frequencies. In [7], for the suppression of the 5 GHz wireless local area network (WLAN) band, a compact FSS with unit geometry similar to the cross-dipole shape is designed.…”

A compact band‐stop frequency selective surface for dual band Wi‐Fi applications

“…In this scenario, a FSS is required which has potential of suppressing both bands to ensure optimum immunity and security. A number of research works reported in recent times covers either of the two bands thus limiting the potential of the installed FSS. Therefore, efforts have been carried out to incorporate the suppression of both bands like in Ref.…”