Wideband MICROSTRIP ANTENNAS

Abstract

Microstrip patch antennas are used in a wide range of applications due to their low cost, conformability, light weight, small volume, ease of manufacture, and ability to be integrated with microwave integrated circuits (MICs). Due to the above advantages of patch antennas, they have become very popular in various applications ranging from aircrafts, rockets, spaceships, vehicular communications, and remote sensing to radiators in biomedical applications.

The most serious shortcoming of the patch antenna is its narrow bandwidth. Different techniques were used to overcome this problem. Among these techniques, gap-coupled parasitic patches, the stacked patches and the slotted patches are used. The 10-dB return loss­ bandwidth of 34.6% has been achieved for stacked circular patch antenna. Also, the 10-dB return Joss bandwidth of 27.65 % has been achieved for the disc gap-coupled to an annular ring patch antenna. Moreover, it is noted that the slotted patch antennas have been found useful in broadband and multi-band microstrip antenna design.