Title :
SAW waveguide-coupled resonator notch filter
Author :
Gopani, S. ; Horine, B.A.
Author_Institution :
Sawtek Inc., Orlando, FL, USA
Abstract :
A unique implementation of a SAW (surface acoustic wave) notch filter using a two-pole waveguide-coupled (WGC) resonator in an allpass network is presented. This configuration exhibits a dramatic improvement in the bandwidth of the notch over the single-pole approach. This application of the two-pole WGC resonator design is discussed in detail, and results of a two-pole design at 193 MHz are presented. A cascaded four-pole resonator notch filter at 193 MHz with low passband loss and broadband notch depth greater than 40 dB is demonstrated. This notch filter is shown to be easy to tune, and exhibits excellent temperature characteristics
Keywords :
cascade networks; crystal resonators; notch filters; surface acoustic wave filters; 193 MHz; SAW notch filter; SAW waveguide-coupled resonator notch filter; allpass network; broadband notch depth; cascaded four-pole resonator notch filter; filter tuning; low passband loss; notch bandwidth; temperature characteristics; two-pole waveguide coupled resonator; Admittance; Attenuation; Band pass filters; Bandwidth; Circuits; Frequency; Impedance; Passband; Resonator filters; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171317
