微帶天線新技術(shù)研究.pdf

1、南京航空航天大學(xué)碩士學(xué)位論文微帶天線新技術(shù)研究姓名：王勇申請學(xué)位級別：碩士專業(yè)：電磁場與微波技術(shù)指導(dǎo)教師：劉少斌20090101微帶天線新技術(shù)研究IIAbstractThemicrostripantennahavebeenwidelyusedbecauseoftheirgoodacteisticssuchaselectricallythinlightweightlowcostconfmablesoon.Howevertheelectri

2、calperfmanceofthebasicmicrostripantennasuffersfromanumberofseriousdrawbacksincludingverynarrowbwidthhighfeedwklowgain.Astherapidlydevelopingofmarketssuggestthatthedemfmicrostripantennaswillincreaseevenfurther.Inthemeanti

3、meitcallsfthedevelopmentofmultibFirstlytheKochfractalantennaisproposedinthisthesisitcanreducethesizeofmicrostrippatchantenna.thenanotherfractalantennacalledsieprinskiisproposed.Itcannotonlyreducetheantenna’ssizebutalsome

4、ettheneedofmultibitsmodifiedsieprinskicanenhancethepomatching.AtthesametimeweproposedanotherfractalantennacalledCrownSquareFractalAntennawhichcanachievethegoalofmultib.What’smeitcanbecodinateeasily.InpracticeweusedtheFra

5、ctalantennatocoverthefrequencyofglobalpositioningsystem(GPS1.57542GHz)digitalmultimediabroadcasting(DMB2.62.655GHz).Thesimulatedtestedresultmachwell.Secondlyweintroduceanewdifferentiallydrivenmicrostripantennawiththeuseo

6、fHshapeslot.Wemakeuseofthehigherdermoderadiationinadditiontotheintrinsicdomainmodeyieldingaverywideimpedancebwidthwhichcanreachtoabout32%.MostimptantlywiththeuseofaUshapedgroundwecanmakethegainmestablewhichisveryimptanti

7、nmoderndevices.IndertoimprovethepomatchwkwecanusethefractaltoHshapeslotmicrostrippatchantenna.Itisprovedveryuseful.Atlastweintroduceanewgainenhancementmethodfmicrostripantennathroughmultiplesuperstrates.Thereareverylittl

8、epaperswecanreferto.Soweproposedfourfactswhichcanimpactthegainoftheantenna.Ontheotherhduotoseveralattractiveadvantagesofmicrostrippatchantennaarraywemade2elements4elements(22)findthatthegainincreasesbytherapidof2.5dBbeca