A Novel Dual-band Monopole Antenna for ISM and UNNI Bands

For the application of antenna in ISM and UNNI bands,a novel monopole dual-band antenna using CPW-fed is proposed.A radiation patch is loaded on a traditional T-shaped antenna to realize operating in dual-band.The effect of antenna size on frequency is analysed,which shows that the frequency ratio can be tuned from 1.67 to 2.67.An antenna worked on ISM/UNNI bands is fabricated and measured,and the measured results are in good agreement with the simulated results.This antenna has a good radiation capability of full-direction,and it has gained a relative bandwith of 21.28% and 3.9% at the lower and higher frequency respectively(S11≤-10 dB),so it is suit for wireless communication field.