| 摘要 |
PROBLEM TO BE SOLVED: To obtain a surface acoustic wave filter where steepness of the filter characteristic toward high frequencies of the pass band is enhanced, miniaturization is facilitated and deterioration in the attenuation at frequencies apart from the pass band is hardly caused. SOLUTION: In this filter, a plurality of one-terminal pair surface acoustic wave(SAW) resonators are formed on a piezoelectric substrate to configure a ladder circuit and a gap W2 between bus bars 4, 5 and tips of electrode fingers 7, 6 connected to the bus bars 5, 4 opposite to the bus bars 4, 5 in at least one-terminal pair SAW resonator interdigital transducer is selected to be a range of 0.50-4λ. |
