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1、http:/ADS MomentumPatch Antennamicrostrip linecircuithigh Qbroadside directivity( end-fired antenna)feed incavityADS(Advanced Design System) feed inTransmission Line Feed 1feedFeed in Feed in 1Coaxial Feed 2coaxial cablefeedTransmissionLine Feed feed in coaxial cablecoaxial cablefeed in coaxial cabl
2、e2http:/Coupled Feed 3coupled line coupling edge3Buried Feed 4Coupled FeedBuried Feedtransmission linecoaxial cable feed inhigher order modescross-polarized radiationBuried FeedSlot Feedfeed in 4Slot Feed 5Buried Feed slotslotslot magnetic dipole slot slot5http:/Transmission-LineModel microstrip lin
3、e6 effeff microstrip line(1)-(1)6eff = r eff = r +1/2 eff 7eff rfringing effect fringing effectL(2)(3)-(2)(3)http:/7L(W/h)eff8rectangular patch antenna TM010 mode(4)-(4)8http:/c(4)fringing effectfringing effect(5) fringingLeff(5)-(5)Cavity Model feed in 9JbandJt h/W Jth/W0Jt0 perfectmagnetic conduct
4、ing surfaces h/Wperfect magnetic conducting surface fringing field TM x fieldcavityperfect electric conducting surfacesperfect magnetic conductingsurfaces9waveequationsVector potential Ax(6)-(6)(7)http:/10Cavity Model11(a) (13)http:/10h/Wpatch antenna Js11(b) slotimageMs=-2nXEa 11(c)12dipoleL TMx010
5、 modeL= /2 dipole(broadside)180null 13 EH plane1411http:/121314http:/ADS MomentumPatch AntennaADSADS Main WindowData Display Window(window new data display) Equation(1)(2)(3)1Layout Window(2) Layout Windowmomentum substrate create/modify(34) momentum mesh setup5momentum simulation S-parametersmoment
6、um6 Data Display Window7momentumapost - processingaradiation pattern(Far-field pattern)88 currentset port solution weights910111data display windowequationshttp:/23http:/45mesh frequencymesh densityhttp:/67Data Display Windowhttp:/89http:/10(a)0http:/(b)60(c)120http:/(d)180(e)240http:/(f)300(g)36011
7、ADSADS Main WindowFile example project momentum antenna single_patch_prjEquation 12(fundamental frequency)7.6GHz2.2 0.79mmLayout Window13Data Display Window147.6GHzhttp:/18.37GHzTM001 mode TM030 mode15161213http:/14Data Display Window(a)TM001 7.6GHzhttp:/(b)TM030 18.37GHz 15(a)7.6GHzhttp:/(b) 18.37GHz 16Transmission Line FeedCoaxial Feed Coupled Feedcoupled line Buried Feed Slot FeedBuried FeedTransmission-Line Model Cavity ModelTransmission-Line ModelADS Cavity ModelADSADS Constantine A.Balanis , antenna theoryanalysis and design, Second Edition, Wiley, CH12, 2000218
