Circular Microstrip Antenna

Nurshuhada , Ali (2011) Circular Microstrip Antenna. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The real aim for this project is to design circular microstrip antenna for WLAN application using analysis method of cavity model. The design of this antenna is made by using CST Design Microwave 2010. The feeding method used for this project is coaxial probe feed. The antenna consists of three layers which are the ground, substrates and patch. The Ground and the patch are made using copper while the substrate is using FR4.The problem about typical microstrip antenna is that it has linear polarization and low bandwidth especially for antenna that use coaxial probe feeding method. In order to get a great performance from antenna, the antenna is designed to produce circular polarization using the slot method. A slot is made at the patch to make two orthogonal modes excited with 90º phase differences between them. To improve the bandwidth of antenna, the slot is also embedded at the ground of the antenna. Here a small circular microstrip antenna is successfully design with circular polarization and good bandwidth. As for the future, this project hopes to bring advantage in telecommunication technology as it comes with a small size, good polarization and bandwidth.

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