Nonequirippleapproximationoffiltercharacteristicscanberealizedeitheroddorderoreven orderinthesymmetricloadcase.Thispaperpresentsamethodofsynthesizingnon-equiripplelow-pass filterbasedoniterationanalysis,inwhichtherationalfractionformedofChebyshevpolynomialisused asthefiltercharacteristicfunction.Thismethodisconvenientforcomputerprog ramming,becausethe attenuationzerosandpolesofthefiltercanbedeterminedeasilyandthesynthesisprocedureissimple, too.Thegivenexamplesshowthatthemethodisofapracticalvalueinfilterdesign ramming,becausethe attenuationzerosandpolesofthefiltercanbedeterminedeasilyandthesynthesisprocedureissimple, too.Thegivenexamplesshowthatthemethodisofapracticalvalueinfilterdesign