| 摘要 |
PROBLEM TO BE SOLVED: To reduce ripples furthermore by configuring electrode fingers of each electrode group to have different pitches so as to make a pass-band width broad and to improve the cut-off characteristic of the transition area. SOLUTION: A conductor material is vapor-depositted to the surface of a substrate 10 and processed into interdigital electrodes by the method of the photolithography or the like to form respectively input electrodes 20 as a 1st electrode group, output electrodes 30 as a 2nd electrode group and reflecting electrodes 40 as a 3rd electrode group. One hundred and several tens of pairs of electrode fingers 21 are arranged to the input electrodes 20, about one hundred pairs of electrode fingers 31 are arranged to the output electrodes 30, and about several tens of pairs of electrode fingers 41 are arranged to the reflection electrodes 40 at a right angle to the lengthwise direction of the substrate 10 at pitches of nearly 1.046μm, 1.048μm, and 1μm respectively different from each other. The pitch for the input electrodes 20, the output electrodes 30 and the reflecting electrodes 40 is made different in this way, then a broad band characteristic is obtained and other characteristics are improved.
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