Design and Optimization of Multi Slot Microstrip Patch Antenna for Wireless Applications

Abstract

The objective of this thesis is to design and optimize the performance of microstrip antenna to efficiently operate at 4.1GHz and 3.5GHz frequencies for wireless applications. In this work, rectangular microstrip patch antennas are designed without slots and with multiple slots with the goal to achieve desired results. This paper presents the designs of compact size, cost-efficient, narrow band microstrip antennas using FR-4 substrate with dimensions calculated based on the resonant frequencies. Three different antennas are designed for each of the resonant frequencies. Several attempts are made to optimize the dimensions of the antenna parameters to improve the minimum return loss achieved, bandwidth, radiation pattern, directivity and gain; which are simulated using CST Microwave Studio simulation software. The proposed antenna for 4.1GHz resonated at a return loss of -21.8dB, giving a bandwidth of 177.3MHz which is 4.324% at -10dB, VSWR of 1.177, 5.946dBi directivity and 2.98dB gain. For 3.5GHz the proposed antenna achieved a minimum return loss of - 49.42dB, bandwidth obtained about 151.7MHz which is 4.33% at -10dB, VSWR of 1.006, 5.95dBi directivity and 3.13dB gain.