A dual bevel compact planar monopole antenna for UHF application

Abstract

This paper presented a novel dual bevel planar monopole antenna with the abil- ity to operate from 470MHz to 1100 MHz. The compact planar monopole antenna consists of radiating element perpendicular to ground plane with dimension of 148mm£64mm and 80mm square respectively. The proposed monopole antenna employing FR4 substrate and implementing beveling technique as well re°ect to the low cost and high bandwidth intention. By introducing a dual bevel, an enhancement of 100% impedance bandwidth can be achieved compare to a single bevel with the same bevel angle of 10±, 20±, 30±, 40± and 50±. Moreover, the dual bevel antenna capable in producing divisive radiation patterns with linear polarization at three di®erent fre- quencies of f1 = 500 MHz, f2 = 700MHz and f3 = 900 MHz. The measured outputs have shown the same behaviour with the simulation results. The proposed antenna has a great potential as a spectrum sensing device for cognitive radio application in the future