IJSRD - International Journal for Scientific Research & Development| Vol. 1, Issue 2, 2013 | ISSN (online): 2321-0613

In this paper, Ultra wideband circular Microstrip patch antenna is proposed. Over years, great interest was focused on microstrip antennas for their small volumes, low profiles, good integration, low costs and good performance. With the continuous growth of wireless communication service and the constant miniaturization of communication equipment, there are higher and higher demands for the volume of antennas, integration and working band. This paper presents A circular polarized (CP) Circular microstrip antenna with triple band for wireless communications system application which are suitable for the 2.6-GHz, 3.7GHz and the 5-GHz triple-band operations. These systems may include various combinations of Bluetooth, WiMAX (Worldwide Interoperability for Microwave Access) and wireless local-area network (WLAN). A circular microstrip patch antenna is designed to operate at 2.6(GHz) with circular polarization, a U slot is inserted thereafter in the original patch to generate the second resonant at 5.4 (GHz). Another C-slot is inserted thereafter to generate the 3.7 (GHz) third band. The C slot insertion effect on the original patch is examined, first arc length effect on the return loss and axial ration is examined in order to get the optimum length, and then the arc orientation effect also is examined to find out the best orientation to place the arc. This design has several advantages as the total antenna volume can be reused, and therefore the overall antenna will be compact. The design is verified through both numerical simulations and measurement ofa fabricated prototype. The results confirm good performance of the singleand multiband antenna design.