http:/www.edajx.comADS 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 cable2http:/www.edajx.comCoupled 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:/www.edajx.comTransmission-LineModel microstrip line6 effeff microstrip line(1)-(1)6eff = r eff = r +1/2 eff 7eff rfringing effect fringing effectL(2)(3)-(2)(3)http:/www.edajx.com7L(W/h)eff8rectangular patch antenna TM010 mode(4)-(4)8http:/www.edajx.comc(4)fringing effectfringing effect(5) fringingLeff(5)-(5)Cavity Model feed in 9JbandJt h/W Jth/W0Jt0 perfectmagnetic conducting surfaces h/Wperfect magnetic conducting surface fringing field TM x fieldcavityperfect electric conducting surfacesperfect magnetic conductingsurfaces9waveequationsVector potential Ax(6)-(6)(7)http:/www.edajx.com10Cavity Model11(a) (13)http:/www.edajx.com10h/Wpatch antenna Js11(b) slotimageMs=-2nXEa 11(c)12dipoleL TMx010 modeL= /2 dipole(broadside)180null 13 EH plane1411http:/www.edajx.com121314http:/www.edajx.comADS 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-parametersmomentum6 Data Display Window7momentumapost - processingaradiation pattern(Far-field pattern)88 currentset port solution weights910111data display windowequationshttp:/www.edajx.com23http:/www.edajx.com45mesh frequencymesh densityhttp:/www.edajx.com67Data Display Windowhttp:/www.edajx.com89http:/www.edajx.com10(a)0http:/www.edajx.com(b)60(c)120http:/www.edajx.com(d)180(e)240http:/www.edajx.com(f)300(g)36011ADSADS Main WindowFile example project momentum antenna single_patch_prjEquation 12(fundamental frequency)7.6GHz2.2 0.79mmLayout Window13Data Display Window147.6GHzhttp:/www.edajx.com18.37GHzTM001 mode TM030 mode15161213http:/www.edajx.com14Data Display Window(a)TM001 7.6GHzhttp:/www.edajx.com(b)TM030 18.37GHz 15(a)7.6GHzhttp:/www.edajx.com(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