| 摘要 |
PURPOSE:To miniaturize a comb line filter and to facilitate its production, by using two ultrasonic delay lines. CONSTITUTION:A main body part 11a of the first ultrasonic delay line provided with a pair of transducers 3a and 4a and lead wires 8a, 9a, and 7a for input, output, and earth and a main body part 11b of the second ultrasonic delay line provided with a pair of transducers 3b and 4b and lead wires 8b, 9b, and 7b for input, output, and earth are piled up and stored in a case 23 having four terminals 18-21 arranged in line. Lead lines 9a, 8b, 8a, 9b, 7a, and 7b are connected to terminals 18-20, and a resistance 12 for mixing is connected between terminals 19 and 20. Four terminals 18-21 are arranged in line, and their lengthwise direction is vertical to plate surfaces of delay mediums 1a and 1b, and lead wires 7a, 7b-9a, and 9b and the resistance 12 are held between slits 22 and do not cross one another to obtain a prescribed delay time. |
