A SAW CONTIGUOUS FlLTEH BANK WITH AN M UEHlVEU LAUUEH

An m-derived ladder for combining SAW filters in a contiguous filter bank is proposed. The series element in each m-derived ladder section is composed of a parallel resonant circuit. The input transducer of a SAW filter is used as the shunt element in each section. A pole of attenuation is produced at the resonant frequency of the series element. Thus,the third harmonic spurious response of the SAW filter is much suppressed by setting the pole of attenuation in the vicinity of the third harmonic.