Design and Analysis of Printed Antennas for UWB Applications

Abstract

Much attention has been devoted to UWB (ultra-wideband) antenna implementation where newlinethere is a restriction of cost, weight, size, performance and easy integration with microwave newlinecircuits. UWB antenna provides amicable solution to high speed data transmission for short newlinerange wireless communication system, satellite, aircraft and radio application.Bit rate more than newline100 Mbps within a 10 m radius for wireless personal area communication (WPAN) is newlinesupported.Operating frequency band for UWB antenna should be in the range 3.1-10.6 GHz newlineand should follow the transmit power spectral density as defined by Federal Communication newlineCommission (FCC).The shortcomings associated with the applications of UWB antenna newlineincludes stability of radiation pattern, matching of impedance, electromagnetic interferences newlineespecially for compact designs with good time domain performance. newlineThis thesis focuses on design and performance evaluation of antennas forUWB newlinecommunication systems. An extensive literature survey on UWB antennas is carried out in newlinewhich the existing UWB antenna characterization approaches are assessed.Total four designs newlineare proposed for UWB applications. UWB antenna design and simulations are carried out on newlineComputer Simulation Technology (CST) 2014 software.All UWB antenna designs are designed newlineon FR-4 substrate.First UWB antenna design has functional bandwidth covering UWB newlinebandwidth range. Methods like truncation in patch, stepped partial ground plane and stepped newlinefeed line are utilized to enhance bandwidthwhich covers whole UWB range.Parametric study newlinefor enhancing the impedance bandwidth is also provided. ThisUWB antenna design is newlinefabricated and tested. Measured values validates simulated results. newlineOther three designs are of three, four and five band-notched UWB antenna. Design newlineobjective and optimization stresses on enhancement of bandwidth and minimization of pulse dispersion. newline