Design and Development of Frequency Selective Surface for Various Practical Applications

Abstract

The era of wireless technology has witnessed a great demand of high data rate for end users. Ultra wide band (UWB) which ranges from 3.1 to 10.6 GHz in the electromagnetic spectrum being the utmost important band has been studied for decades and with the commercialization of this band in 2002, enormous amount of the work is carried out in this band due to the magnificent features it owns, such as, high impedance bandwidth, low power consumption and low cost. UWB frequency band has been used in various applications such as imaging, sensor data collection, indoor position systems and high accuracy radars and many more. However, various devices work in the narrow bands such as mobile WiMAX, Sub 6 GHz 5th generation (5G) frequency band, Satellite communication X-band, WLAN and Satellite communication C-band cause the interference among the closely separated narrow band operation and with UWB system. To mitigate the effect of interference the implementation of spatial filter becomes mandatory. Therefore the concept of spatial filtration comes into existence and Frequency Selective Surface (FSS) is a preferential candidate in doing so. FSSs are commonly 2 D planar periodic structures which behave as a spatial filter. To electromagnetic shield the system, the band stop filtering feature is adopted. In this work, multiple-bands as well as single bands have been band-stopped using single FSS design in order to eliminate unwanted radiations and for better functioning of the system. Various methods to develop the design parameters of the conventional SL and SSRR, and their modified versions have been explored. Moreover, in communication system as the wave impinges from any direction, therefore, highly stable frequency response regardless of the widest angle of incidence and polarization of the incident plane wave is required. Therefore, for the improvement in the scattering parameters various techniques have been implemented. Angular stability is one such characteristic which defines a good FSS. Angular stability is improv