Abstract: Wireless communication has been developed very rapidly past few decades. While the 4th generation mobile system that supports multimedia services is about to be broadly used through the 1st-3rd generation systems be concentrated on speech, these systems are fully available wherever users are to solve these problems additional base stations and repeaters need to be built again with the decrease of the cell size for covering where the base station signals cannot reach. However, these additional base stations and the repeaters raise the cost of implement and finding the right place is almost infeasible because other base stations and repeaters already occupied the many places. In this regard, the method to serve dual services simultaneously is a key technology to make it possible for everyone to communicate with people anywhere. In terms of size, cost and implementation, the microstrip antenna is a great candidate for the dual service repeater, since the repeaters are usually located in the confined place. But the bandwidth enhancement techniques should be considered to overcome the major drawback of narrow bandwidth. There are several bandwidth enhancement techniques to broaden the impedance bandwidth of the microstrip antenna such as stacked patch, parasitic patch and multiplayer antennas.
P. Suresh, J. Venkatagiri and G. Prakasha, 2017. Design and Development of Microstrip Patch Antennas for WLAN Applications. Journal of Engineering and Applied Sciences, 12: 5921-5923.