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Synthesisofadvancedmicrowavefilterswithoutdiagonalcross-couplings2862IEEETRANSACTIONSONMICROWAVETHEORYANDTECHNIQUES,VOL.50,NO.12,DECEMBER2002SynthesisofAdvancedMicrowaveFiltersWithoutDiagonalCross-CouplingsRichardJ.Cameron,Fellow,IEEE,A.R.Harish,Member,IEEE,andChristopherJ.Radcliffe,Member,IEEEAbstract―Asymmetricfilteringcharacteristicsarefrequentlyusedforthedesignofmicrowavefiltersforthecellulartelephonyindustry,particularlyforthetransmit/receivediplexersforbasestations.Typically,suchfiltershavetobemanufacturedinlargequantitiesatthelowestpossiblecost.However,duetotheasymmetricfilteringcharacteristics,thedesignsoftenincludediagonalcross-couplingsbetweennonadjacentresonatorsinadditiontotheusual“straight”couplings.Diagonalcouplingstendtobemechanical……