Optimized Design of Wide Band Planar and Printed Monopole Antennas for Microwave Applications

Abstract

With recent development in the area of microwave communication systems, there newlineis a growing need for high information rate and enhanced quality of service. With newlinethese requirement, it is needed to design and develop wideband antennas for wireless communication systems. Generally, wideband wireless technologies are classified into WPAN, WLAN, WMAN and WWAN based on the coverage area. Still, newlineto meet the demand for the co-existence of a wireless system with a high data newlinerate, IEEE has developed an ultra-wideband technology (UWB) standard. An newlineultra-wideband (UWB) technology has attracted the wireless communities with newlineits attractive features like multi-band communication, low power, and moderate newlinedata rate. This thesis presents the research carried out to design and develop newlinevarious planar omnidirectional antennas for microwave applications. Planar antennas have attracted much attention due to many features, including low profile newlinestructure, wideband performance, and high gain radiation properties. Similarly, newlineomnidirectional antennas are best suited for applications requiring good all-around newlinecoverage over a broad area. The conventional and fractal (self-similar structure) newlinemethods are adopted to achieve the above goal. Based on the traditional approach, newlinea microstrip feedline printed antenna using hexagonal-shaped radiators has been newlineproposed. The antenna provides an excellent omnidirectional radiation pattern newlineand transmission response within the wideband (2.52-12.91 GHz). The antenna newlinefocuses on sub 6 GHz 5G band and WLAN/Wi-Fi (3.6/4.9/5.9 GHz) applications. newlineSimilarly, a wideband circular monopole antenna with quad T-shaped slots has newlinebeen developed for WLAN/WiMAX application. Another method involves the newlineuse of fractals for the development of wideband, high gain, and planar monopole newlineantennae. An ultra-wideband monopole antenna using compact hexagonal-square shaped fractal geometry has been proposed, having 11.4 GHz bandwidth, with gain newlineof 3.9 dBi over the entire range of frequency. Further higher gain is achieved by newlineusing nove