Bridged Circular Microstrip Patch Antenna for Wireless Applications

Abstract

Demand for wireless networks has soared due to technological innovation and rapid expansion of wireless services. Government and commercial applications highly requires cost effective, low-profile antennas. As microstrip patch antennas are simple and inexpensive to manufacture, these low -profile antennas are used for wide range of wireless applications. In this paper, a new circular bridged patch antenna is designed which covers 4.96–14.55 GHz band i.e. 9.59 GHz bandwidth which cover completely X band and part of C and Ku bands. The proposed antenna design consists of two concentric circles connected with lines of varying widths and at different angles giving a bridge shape to them. Defected ground structure is used with a notch at middle of ground to give better results. Antenna has been fed by microstrip line feed. The antenna has been designed on FR-4 substrate with 1.6 mm thickness. In this proposed patch peak of resonant frequencies occurs at 5 GHz, 7 GHz, 9 GHz, 11 GHz and 13 GHz. Maximum gain of 4.81 dB is achieved. Applications of the aerial are in WLAN, IEEE802.11a band (5.15–5.825 GHz), C-band (4–8 GHz) and X band (8 to12GHz) simultaneously. Parameters like return loss, gain, bandwidth and directivity of proposed structures are studied and analyzed. The antenna’s characteristics have been calculated using CST Studio Suite.