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1、366IEEF.TRANSACTIONSONMICROWAVETHEORYANDTECHNIQUES,VOLMTT-34,NO.3>MARCH1986spendingtoaseries-connectedradialstubwiththesameactualThecalculations,however,assumethattherearenolosseswithindimensions,therebygivingsignificantdifferencesinthefrequencythedie
2、lectricsalthoughitisrecognizedthatinthepracticalbehaviorofthetwostructures.situationsevereattenuationcanoccur.Finally,theeffectivenessofthemethodisstressedbytheInthispaper,westudytheeffectsofobjectandmediumpresentationofpreliminarytheoreticalresultsob
3、tainedbyanattenuationondiffractiontomographicreconstructionbasedonextensionoftheplanarapproachtothecaseofalossyradiaftheBornapproximation.Conditionsunderwhichdistortionsofstub.theimageareminimizedarealsoinvestigated.WFEMNCESII.BRIEFOUTLINEOFTHENUMERIC
4、ALPROCEDURE[1]JPVinding,“Radialhnestubsaselementsinstriplinecircuits,”inTheBornapproximation[1-6]assumesthattheincidentfieldsNEREA4Rec.,1967,pp.108-109withintheobjectarethesameaswhentheobjectisabsentand[2]HA,Atwater,“Mlcrostnpreactivecirmutelements,”I
5、EEETramMt-crowut,eTheoTTech.,VOLMTT-31,pp488-491.June1983.theobjectisconsideredtobeatenuouscollectionofpoint[3]AChuetU[,““GaAsmonolithicfrequencydoublerswithseriesconnectedscatterers.UsingtheGreensfunctionforsphericalwavesinavaractordiodes,”in1984IEEE
6、MTT-SIntMJcrowuueSyrnpD1g,pp51-54.uniformlosslessmedium,aclosed-formrelationintheFourier[4]JVrba,“Dynamicpermlttwitlesofmicrostripringresonators,”J3ectr’on.planecanbederivedbetweentheexternalforwardscatteredfieldLetr..vol.15,no.16,rm.504-505,Awz1979.a
7、ndthedielectricconstantdistributionwithintheobject.One[5]F.Glannini,R.Sor~&tino,andJ‘Vrba,“Planarcmcuitanalysisofmicrostripradialstub,”IEEETrans.Microw,uueTheorvTech.,vol.MTT-waytostudytheeffectsofattenuationonthisrelationshipisto32,pp.1652-1655,Dec19
8、84.chooseaparticulargeometrywheretheexactscatteredfieldscanbecalculatedwhenlossesareincludedbothwithintheobjectandintheuniformmediumoutside.Reconstructionofthedistribu-tionofscattererusingtheBornapproximationwillthenrevealtheresolvingpowerofth
