Design and Analysis of Multiband Octagonal Microstrip Patch Antenna with Different Annular Ring

Microstrip patch antennas are available in different shapes and sizes. In this paper octagonal Microstrip patch antenna is designed. The octagonal patch antenna is simulated with different diameter concentric circles with improved gain. When the difference between major and minor diameter of the concentric circle improves, gain also improves. If the number of concentric circle increases the number of resonating frequency also increases. The major and minor diameter difference of 1.5mm gave the highest bandwidth of 332MHz and return loss also improved by 26.1009dB. Gain of the antenna for this new design is increased by 4dB, Band width is improved by 29.518%, and Return Loss is improved by 64.958% for the Concentric Circle 2.647/0.578. The HFSS software is used to simulate the new antenna.