功分器资料

DesignofunequalWilkinsonpowerdividerfordual-bandoperationwithisolationstubs

X.Li,Y.-J.Yang,L.Yang,S.-X.Gong,T.Hong,X.ChenandY.-J.Zhang

ThedesignofanovelunequalWilkinsonpowerdividerfordual-bandoperationispresented.Theisolationstubsareintroducedtoreducetheparasiticeffectsbetweenthetwostubsthatareconnectedbytheiso-lationresistor.Closed-formdesignequationsarederivedbasedonnetworktheory.Thevalidityofthisanalysisiscon rmedthroughthedesign,simulationandexperimentalresultsforapowerdividerfor1and2.5GHz.

Introduction:Powerdividersarefrequentlyusedinthedesignofmicro-wavecircuits.Owingtothetrendofdual-bandormultibandcommuni-cations,wecanseeaworldwideefforttodevelopdual-bandormultibandpowerdividers[1–3].However,mostofthesecannotsatisfytheunequalpowerdividingratio.FortheproposedunequalWilkinsonpowerdivider[4],thesingle-frequencypropertyisstillade ciency.Moreover,themediatransmissionlinesinthesepowerdivi-dersareplacedclosetoeachother,andasaresult,theparasiticeffectsbetweentransmissionlineswillbeincreasedwhentheoperatingfre-quencybecomeshigher[5].Isolationstubsareintroducedtodealwithequalpowerdividersin[6].

…… 此处隐藏2164字 ……

ð9Þ

So,Zin2andZin3canbewrittenas:

1þk2

Z0;Zin2¼ð1þk2ÞZ0k2

Zin3¼

ð2Þ

Fig.2showsthattheimpedancesoftransmissionlinesandstubsvarywiththefrequencyratio(f2/f1).Theseresultssuggestthat,whenavail-ableimpedancevaluesoftransmissionlinesliebetween7and150V,thepowerdividercanoperateatafrequencyratiorangingfromp 1.98to2.69foropenstubsaccordingto(5)and(6)whenk¼2,andfrom1.73to2.3forshortstubsaccordingto(5)and(7).

ELECTRONICSLETTERS19thNovember2009Vol.45No.24