International Journal of Applied Engineering Research ISSN 0973-4562 Volume 9, Number 20 (2014) pp. 7735-7743 © Research India Publications http://www.ripublication.com A Miniaturized Circular Microstrip Patch Tri Band Ring Antenna for SATCOM Applications B. Priyadharshini and S. Sivasundarapandian Sathyabama University Tamil Nadu, India. priyadharshini8821@gmail.com, sivasundar.etc@sathyabamauniversity.ac.in Abstract The design and characteristics of Miniaturized Circular Microstrip Patch Ring Tri Band Antenna are simulated and presented. The single sided Tri Band antenna is placed on the top layer and the bottom layer is grounded to obtain the desired antenna characteristics. This antenna is designed for satellite band of frequencies from 8 – 14 GHz covering X band and Ku bands for Weather Radar applications. This microstrip tri band antenna shows directional radiation pattern with the gain value of 3.7 dBi at 9 GHz and dual band at 4.4 dBi at 12 GHz and 3.5 dBi at 13.5 GHz. The objective of this paper is to reduce the size of the antenna and to increase number of resonant frequency bands.This antenna resonates at three different frequencies 9GHz, 12 GHz and 13.5GHz. Key Words: Microstrip patch Antenna; Circular Patch; Tri Band; directional radiation pattern; Radar Applications INTRODUCTION Satellite expertise is rising fast, and the appliances for it are greater than ever in every part of the occasion. Satellites can be exercised for radio communications, as well as they can be employed for weather forecasting, astronomy, broadcasting, mapping and countless applications. There are different satellite frequencies bands that can be brought into play, descriptions have been widened in order that they can be submitted to easily. Owing to growth in satellite’s use, amount and volume, overcrowding has become a severe issue in the lower frequency bands. Innovative machineries are being scrutinized with the intention that higher frequency bands can be utilized [18]. A new microstrip circular antenna arrays were designed and characterized to