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How to fix iTunes 11.1.1 on Windows 10 without.. Bitdefender, a longtime favorite on computers running Windows, has. on Windows 7 & Vista.1. Field of the Invention
The present invention relates to a surface acoustic wave filter, and more particularly to a surface acoustic wave filter having a large number of series arm resonators and a large number of parallel arm resonators or a pair of series and parallel arm resonators.
2. Description of the Related Art
An example of a conventional surface acoustic wave filter is shown in FIG. 1. The surface acoustic wave filter is made of a piezoelectric substrate 3, and first, second, third and fourth IDT (Interdigital Transducer) 21, 22, 23 and 24, each of which is made of a comb-like electrode formed on the substrate 3. The first to fourth IDTs 21 to 24 are arranged in series and parallel, such that pairs of the series and parallel IDTs 21 and 22 and the series and parallel IDTs 22 and 23 are disposed symmetrically with respect to the middle IDT 23 disposed therebetween. The total number of electrodes on the substrate 3 is usually 18, or 30 (number of electrodes=18+4=number of input/output electrodes and number of electrodes in the IDT). As for the number of electrodes, there are three types: 1) 12 electrodes (six electrodes in the IDT and six electrodes in the IDT) 2) 24 electrodes (12 electrodes in the IDT and 12 electrodes in the IDT) 3) 30 electrodes (18 electrodes in the IDT and 12 electrodes in the ac619d1d87
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