INTRODUCTION The field of wireless communications has been growing since the invention of portable mobile phones some decades ago. The simulation results of designed antennas indicate that the proposed antenna fulfils the excellent requirements and characteristics for various frequency bands and showing the good radiation patterns and characteristics in the interested WLAN communication. The proposed antennas have been design using Matlab, modeled and simulated by using computer simulation technology (CST) micro studio. The First antenna was designed to operate at a resonant frequency of 2.45GHz dielectric substrate (Rogers RT5870) with relative permittivity (=2.33) and thickness of 0.787mm, for applications such as IEEE 802.11 Wi-Fi, IEEE 802.15.1 Bluetooth, IEEE 802.15.4 ZigBee, wireless USB, microwave oven, codeless phone etc. here line feed method was used to exited the patch antenna. The aim of this thesis is to design a rectangular microstrip path antenna for global WLAN systems and study the effect of various antenna parameters such as the performance of the antenna in term of radiation pattern Directivity, gain, bandwidth, VSWR, return loss and, far-field etc. In order to transmit and receive more information large bandwidth are required, and bandwidth enhancement is currently a popular research area. In additional, for miniaturization the wireless communication system, the antenna must also be small enough to be placed inside the system. However, the difficult of antenna design increases when the number of operating frequency band increase. This technological trend has focused much effort into the design of a Microstrip patch antenna.

In the recent years the development in communication systems requires the development of low cost, minimal weight, low profile antennas that are capable of maintaining high performance over a wide spectrum of frequency.

Cst antenna software