Dual‐band single‐layer quarter ring frequency selective surface for Wi‐Fi applications

Abstract

This study proposes a frequency selective surface (FSS) design to be used in Wi‐Fi shielding applications as either a band reject or band pass dual‐band single‐layer filter. The proposed design consists of a combination of basic elements, that is, ring loops/slots, and is tuned at both 2.4 and 5.2 GHz Wi‐Fi frequency bands. It has a relatively stable frequency response in the aforementioned Wi‐Fi bands for incidence angles ranging from 0° to 45°. Both band reject and band pass designs are presented, along with their unit cell dimensions. Simulation and model validation through measurements demonstrate the performance of the proposed FSS design. Active variants are also proposed and briefly evaluated, in simulation environment, which should allow for applications where an on–off switching is desired at 2.4 and 5.2 GHz Wi‐Fi bands.

Reduction of wireless signals in indoor environments by using an active frequency selective wall based on spectrum sensing

“…2 Hence, research to improve the spectrum efficiency in indoor environments by using a frequency selective shielding (FSS) wall structure that either passes or reduces a specific frequency band is needed. 3,[8][9][10] Furthermore, an active research effort has been ongoing on spectrum efficiency control through the application of an active FSS (AFSS) wall structure in a building that can actively change the passing or reducing frequencies. Widely known areas of application that utilizes this electromagnetic property include radome in fighter jets and electromagnetic wave absorbent material.…”

“…[3][4][5] An FSS structure is a periodic structure where conductors are repetitively arranged over a dielectric substrate acting as a spatial filter that either passes or reduces electromagnetic waves in a specific frequency band. [10][11][12][13][14] The most common method of changing the operating frequency of an AFSS wall structure is to use active components like PIN or varactor diodes. 6,7 Recently, research has been conducted on the application of FSS structures in walls and windows of a building for efficient use of signals in an indoor communication environment.…”

“…3,4,[7][8][9][10][11][12][13][14] In recent years, research has been conducted to evaluate the signal performance indirectly by simulating the received signal strength, delay spread, and channel capacity to check whether the indoor wireless LAN communication performance can be improved. 3,4,[7][8][9][10][11][12][13][14] In recent years, research has been conducted to evaluate the signal performance indirectly by simulating the received signal strength, delay spread, and channel capacity to check whether the indoor wireless LAN communication performance can be improved.…”

“…6,7 Recently, research has been conducted on the application of FSS structures in walls and windows of a building for efficient use of signals in an indoor communication environment. 3,[8][9][10] Furthermore, an active research effort has been ongoing on spectrum efficiency control through the application of an active FSS (AFSS) wall structure in a building that can actively change the passing or reducing frequencies. [10][11][12][13][14] The most common method of changing the operating frequency of an AFSS wall structure is to use active components like PIN or varactor diodes.…”

“…3,[8][9][10] Furthermore, an active research effort has been ongoing on spectrum efficiency control through the application of an active FSS (AFSS) wall structure in a building that can actively change the passing or reducing frequencies. [10][11][12][13][14] The most common method of changing the operating frequency of an AFSS wall structure is to use active components like PIN or varactor diodes. 15 The use of PIN diodes can change the operating frequency of 2 frequency bands by switching on/off the PIN diode.…”