Study of Reconfigurabl Antenna for Wireless Applications

Abstract

newline Wireless communications have seen an exponential growth in the recent years, In particular in the segment of cellular communications and wireless sensor networks. In general, request for expanded transmitting efficiency, better signal-to-noise ratio of cellular communication channels, and expansion of the operating frequency range of the equipment are needed. Initially, since 4 G technology has been adopted and applied, a range of additional bands have been added. The missing expansion of the operating band presents a greater challenge, particularly in the low-frequency band, because of its large wavelength. It is very challenging to build a wireless network that includes one or more multi-standard antennas built into a mobile device. A passive antenna has reached the limit and the use of the reconfigurable frequency to extend the working spectrum of the antenna is a very positive approach. In addition, in the implementation of wireless sensor networks, the reconfigurable directional antenna has the ability to minimize accidents, improve contact gap optimize consumption compared to the traditional omnidirectional antenna. As, modern society has entered into the information age, and people present higher requirements for the antenna, that is, the antenna should not only have a wider frequency band, smaller size and is easier to install, but should also have a high radiation efficiency and anti-interference performance, and other characteristics. newlineThus, in order to address the above mentioned issues in this thesis we propose various types of frequency reconfigurable antenna to be utilized for diverse wireless applications. The first chapter deals with the overview of antennas. In the second chapter literature review of various multiband reconfigurable antenna is performed. The third chapter explains the procedure to characterize the fabricated antenna. Various antenna parameters measurement technique from VNA is explained. Also, the setup to measure the radiation performance of the antenna is discussed