Study of Broadband Microstrip Patch Antenna

Abstract

viii newlineSYNOPSIS newlineWith the wide spread proliferation of wireless communication technology in newlinerecent years, the demand for compact, low profile and broadband antennas has newlineincreased significantly. To meet these requirements, the microstrip patch newlineantenna has been proposed. Microstrip patch antennas are low profile antennas newlinethat are simple and inexpensive to manufacture. They are mechanically robust newlineand are conformable to planar and non-planar surfaces [1, 2]. The main handicap newlineof microstrip antennas is their very narrow frequency bandwidth which is newlinetypically only a fraction of a percent or atmost a few percent. Enhancement of newlinebandwidth of microstrip elements is a challenge to the researchers [1]. Various newlinetechniques have been developed during last two decades. Still a significant newlinefraction of researchers is involved in this area resulting in new techniques which newlineare almost in their infancy newlineRecently, several techniques have been proposed to enhance the bandwidth of newlinemicrostrip patch antennas. In 1990 C.K. Aanandan, P.Mohanan, K. G. Nair [3] newlinedeveloped microstrip antenna with large band-width using a parasitic technique. newlineCompared to the available wide-band antennas, the proposed antenna structure newlineis very compact and gives a less distorted radiation pattern with frequency. An newlineimpedance bandwidth which is eight times that of a conventional patch antenna newlineof the same size is achieved. A wide-band single layer patch antenna was newlineanalyzed by Naftali Herscovici [4]. A new type of patch element is presented. newlineThe patch is suspended over the ground plane and supported by a nonconductive newlinepin. It is fed by a three dimensional transition connecting the patch newlineto a perpendicular connector. The bandwidth of this element is high when built newlineon a large ground plane. newlineix newlineDesign of wide-band aperture-stacked patch microstrip antennas was studied by newlineS.D.Targonski, R.B.Waterhouse and D.M.Pozar [5]. A variation of the aperturecoupled newlinestacked path microstrip antenna is presented, which greatly enhance its newlinebandwidth up to one octave.