Design Of Multi Band And UWB Miniaturized Antennas

The rapid development of the interconnected network promotes the development of the antenna,and the miniaturization is a hot spot in recent years.This paper studies the frequency reconfigurable antenna.The antenna switch using dynamic PIN diode to change the antenna state,thus making an antenna to achieve multiple antenna effect and reduce the size of the antenna;secondly studies the ultra wideband Vivaldi antenna,is mainly to change the antenna radiation slot so that the antenna to achieve miniaturization.The specific research contents are as follows:(1)This paper introduces the design of a multi band frequency reconfigurable antenna,by changing the switching characteristics of PIN diode side so that the antenna can work in three modes,namely IFA model,covering GSM850/900,PCS1900/UMTS2100 band;monopole model covered LTE2300,WLAN2400,LTE2500 and GLONASS1616 band;Loop model coverage DCS1800,LTE2500 band.The radiation efficiency is more than 35%,and it reaches about 85%at high frequency.(2)Then,a ultra wideband Antipodal Vivaldi pair antenna is designed.This antenna realizes the miniaturization of the antenna by using the arc curve,loading"lens"and"guide".The antenna has a band range of 3.01-22GHz,a size of 3.4×1.7×0.08cm~3,and a more than3dBi gain.(3)Finally,an antenna for the joint simulation of the Antipodal Vivaldi and the SMA joint is designed.On the basis of the previous antenna,the antenna is introduced into the engineering diagram of the feed structure,and the parameters of the antenna are optimized.As a result,the frequency range of the antenna is 3.06GHz-10.6GHz,the size of the antenna is only 34×16×0.8mm~3.And,the high frequency gain reaches 6.23dBi,in which the"lens"mainly improves the low frequency gain,and the"guiding device"mainly improves the high frequency gain.