Evaluation and Optimization of Band Notch Characteristics in Ultra Wide Band Monopole Micro Strip Patch Antennas For Wireless Applications

Abstract

The UWB (Ultra Wide-Band) is a radio wave communication technology that obtains very low energy pulses and it is intended for short-range and high bandwidth communication by using the radio spectrum in GHz Range. The FCC (Federal Communications Commission) also allocated a bandwidth of 7.5 GHz, i.e. from 3.1GHz to 10.6 GHz to UWB applications, by far the largest spectrum allocation for unlicensed use the FCC has ever granted. newlineFor Wireless Personal Area Networks (WPANs) environments, UWB technology is an excellent solution for the ultra-high-speed data services up to 500 Mega bit per second (Mbps). Microstrip patch antennas represent one family of compact antennas that offer a conformal nature and the capability of ready integration with communication systems printed circuitry. Due to their low-profile structure Microstrip patch antennas are increasing in popularity for use in wireless applications. newlineFor better antenna radiation performance, a thick dielectric substrate having a low dielectric constant is preferable since this provides larger bandwidth, better efficiency, and better radiation. However, such a configuration leads to a larger antenna size. In order to obtain a compact Microstrip antenna with higher dielectric constants must be used which is less efficient and narrower bandwidth. Hence a compromise must be reached between antenna performance and their dimensions. newlineIn present thesis, we have consider a microstrip patch antenna structure with minimum ground length (Lg) in mm to optimize the higher value of return loss and attained best performance to overcome the problem of electromagnetic interference (EMI) of various signals newlinein UWB region for other wireless applications includes band notch filter characteristics in Ultra Wide Band . So that this type of radiator can reject the existing frequencies band from the ultra-wide band region. newlineThis thesis presents the radiation performance of a microstrip patch antenna with band reject filter characteristics in UWB designed on glass epoxy FR4 substrate. The