Screen printed frequency selective surfaces for room isolation in buildings

Abstract

A ring type frequency selective surface (FSS) can provide transmission stop-band characteristics in rooms. This allows adjacent rooms to be isolated for one LAN for frequency reuse while other frequencies pass through the walls with minimal attenuation. The FSS was screen printed on a thin flexible plastic substrate of permittivity 3.2 with a stop band at 12.3GHz and 10dB bandwidth of 3.5GHz. The variation in bandstop characteristics was investigated for various wall materials. The centre frequency varied by more than 3 GHz for common wall materials which means significant transparency for some building materials. The technique is a low cost method of confining LAN picocells in one room.

Design of a paper-based reconfigurable frequency selective surface structure

“…This method has disadvantages such as complex processes and high manufacturing cost. Thus, it is difficult to apply this method to actual indoor spaces [4,5].…”

“…In addition, paper or transparent films that are inexpensive with flexible features can be used in wallpaper applications [4,5]. Therefore, various studies are being conducted to improve communication performance by enhancing wireless signal intensity, reducing interference between wireless signals such as those from WLANs, and blocking electromagnetic interference (EMI) in indoor spaces [9] by manufacturing an FSS using the ink-jet printing method [10,11].…”

Bandpass frequency selective surface using asymmetrical slot four arms star geometry

“…Essentially, the FSS consist of basic elements etched on a dielectric substrate, arranged in a planar periodic structure, Figure , providing filtering properties . Although radomes, absorbers, and dual band antennas subreflectors are typical FSS applications, reconfigurable antennas , improvement of thermal and communication efficiency in smart buildings , and metamaterials , are examples of recent uses of FSS. The substrate thickness and permittivity, the polarization of the incident wave, the geometry of the planar circuit and the spacing between the elements within the FSS structure, Figure , are some specifications that affect the FSS frequency response.…”

Optimization of meander line radiators for frequency selective surfaces by using genetic algorithm

“…Usually, a FSS is constructed from a planar structure, consisting of one or more metallic patterns, each backed by a dielectric substrate with a frequency response that is entirely determined by the geometry of the structure 1 . Frequency selective radiators are used in applications ranging from radars and satellite communication to electromagnetic shielding and room isolating in buildings 2,3,4 or monitoring of slow displacements. In a previous paper 5 , we proposed an optimized antenna, a copper NU-MLA 1 , for RFID tags that provide a low gain, as the radiators are small in terms of wavelengths, at a frequency of 869 MHz.…”