المجلة الدولية للعلوم والتقنية

An antenna is a device that is used to convert guided electromagnetic waves EM waves. Significant developments have been done to design compact, minimal weight, low profile antennas. The technologist has focused on the design of microstrip patch antennas, resulting in various microstrip antennas. Microstrip antennas may be made of any geometrical shape and dimension. In this paper microstrip patch antenna has a radiating circular patch on one side of a dielectric substrate having very small thickness and has an infinite ground plane on the other side Dielectric materials may be considered as the backbone of microstrip antennas. Here we have designed the circular microstip patch antenna for Ultra-Wide Band applications, which covers the band 3.1 to 10.6 GHz. The antenna is designed using two substrates RogerRT5880 and RogerRT5870 and a microstrip line feed is used. Design of the antenna is carried out using CST Microsoft Studio simulation Software. So, that we get the directivity 3.326dBi (Roger RT5880), and 3.638 dBi (Roger RT5870)................ Keywords: .........Circular patchantenna, Ultra-Wide Band, Roger RT5880 and Roge rRT5870 substrate, CST.