Abstract

Wide passband notch filter is fulfilled by combining LC-all-pass filter with one-port-SAW resonator by means of its impedance characteristics. It possesses good frequency selectivity and low insertion loss due to good frequency selectivity of resonance-frequency resonator and low insertion loss of LC filter. Higher attenuation of specified frequency can be achieved by cascade. Compared with LC notch filter, it posses sharp cutoff frequency and narrower notch?width. This paper first discusses the principle of this filter, and then proceeds with theoretical simulation and experimental demonstration.

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