标签: evanescent

TransitionalComblineEvanescentModeMicrowaveFiltersWElC-2TRANSITIONALCOMBLINE/EVANESCENTMODEMICROWAVEFILTERSmRalphLevyt,Hui-WenYaos,andKawtharA.ZakitttR.LevyAssociates,1897CaminitoVelasco,LaJolla,CA92037ttElectricalEngineeringDepa”rtment,UniversityofMaryland,CollegePark,MD20742$CTAIncorporated,6116ExecutiveBlvd.,Rockville,MD20852ABSTRACTTraditionalcomblinefiltertheorybasedonTEMmodecouplingresultsinbandwidthswhicharetoolarge,theincreasebeingafunctionofthegroundplanespacingtowavelengthratiob/X.Astheb/Xratioincreasesfrom0to0.35thebandwidthratioBWR,definedasactualbandwidth/TEMbandwidth,increasesfromunitytoover2:l.Thisbandwidthincreasehasnowbeenconfirmedbycalculationofthecouplingcoefficientbet,weericomblineresonators……