Design and Fabrication Of Stacked Aperture Coupled And CPW Fed Microstrip Patch Antennas For Wireless Communication

Abstract

In the modren world, a high data rate is highly in demand for all wirelwss applications. This requires broadband for those systems .Ultra wide band is a techology that offers many advantages and is also highly in demnd.In addition to these, we need multi-band and wider band antennas to cover the various UWB wireless applications into a similar terminal appliance is aslo required. To obtain better transmitting and receiving rate wide band antennas are required to cover satisfactory operating bands. For miniaturizing the wireless communication system, the antennas must as small enough to be placed within the system. The micro-strip patch antennas have various advantages over other type of antennas that make them a good candidate for the use in wireless communication systems. Among MPA , aperture coupled Stacked MPA offer a high bandwidth of operation that are capable of showing ultrawide band for the desired wirless applications of interest.Thus the resarch work presented in this thesis focuses on the design and simulation of two stacked aperture coupled MPA and two CPW fed antennas. The parametric variations carried out for antenna polarization are also stidied to obatin desired results. The first antenna that has a U-shaped slot with plus shaped DGS covers a band 4.8 to 10.8 GHz with a bandwidth of 5.92. The second antenna structure has a T-shaped parasitic patch with swastika shpaed DGS covers a frequency band of 6.227 to 14.8 GHz with a bandwidth of 8.57 GHz. The third antenna design has a circular shaped patch with coplanar ground plane covers a band of 1.46 GHz to 6.07 GHz with a bandwidth of 4.61 GHz. The last antenna structure that has a rectangualr shaped patch with coplanar ground plane covers a band of 4.2 GHz to 12 GHz with impedance bandwidth of 7.8 GHz. All the design and simulations are done in CST MWS version 2014. Two antennas; one stacked aperture coupled MPA and other CPW fed antenna are fabricated using photolithography process and tested on a VNA. The measured results are quite matching with simulated ones, allowing the antennas to be suitable for satellite navigation, telecommunication, Aircraft surveillance, amateur radio, Bluetooth ,Zig-Bee, weather forecasting, SONAR, communications satellites like in microwave ovens, microwave devices, mobile phones , global poisoning system, recreational radio, for long distance radio communication,WLAN,Wi-Fi, military radio field requirements i.e. for disaster executive planning system and its training, electronics welfare activities or in military actions, satellite communication, radar, space communication ,global broadband system, unpaid radio system, molecular revolving spectroscopy etc.