Design, Fabrication and Perfomance Analysis of Single and Dual Band MSA for WLAN and WiMAX Applications

Abstract

The field of mobile and wireless communication is growing at very fast rate covering many technical areas. Wireless local area network (WLAN) and Worldwide Interoperability for Microwave Access (WiMAX) technology is most rapidly growing area in the modern wireless communication. This gives users the mobility to move around within a broad coverage area and still be connected to the network. This provides greatly increased freedom and flexibility. For the home user, wireless has become popular due to ease of installation, and location freedom. So, there is continuously increasing requirements of efficient and high performance antenna .The features of antenna which every technology requires is light weight, small in size and low cost etc. Apart from this feature antenna also should have wide bandwidth and should have multiple resonant frequencies. Almost all these requirements can be fulfilled by Microstrip patch antenna.

The main aim would be to reduce the number of antennas , this can be done by multibanding and to increase the BW and to present dual band with DGS using aperture feeding technique for WLAN/WIMAX applications. A simple rectangular microstrip patch antenna is designed for a single frequency of 5.2/3.6GHz with aperture and microstrisp line feed feeding techniques. A comparison is made at 5.8GHz with microstrip feed using different patches shapes, in terms of patch size, gain, bandwidth, directivity etc.

Next, various Microstrip antennas for different WLAN/WiMAX and LNB (Low noise Block and transoceanic down converter) application with reduced ground structure and DGS (Defected ground structure) are presented with a dual band. The various parameters like return loss, smith chart, radiation pattern and VSWR etc have been studied and plotted for each simulated antenna. The affects of various parameters like length of the feed, width of the feed and also of slot, and slot location in case of aperture coupling has been presented. Finally, a fabrication procedure has been done and the measured results are compared with simulated ones to validate the antenna performance in practical scenario.