surface acoustic wave bandpass filter

Abstract

Abstract PURPOSE:To ensure a large attenuation at a non-pass band by constituting an independent band pass filter in the 1st surface acoustic wave device and the 2nd surface acoustic wave device. CONSTITUTION:The 1st surface acoustic wave device A consists of the 1st acousto-electric transducers 4 divided repeatedly into plural numbers in the propagatio direction of the surface acoustic wave, the 1st electroacoustic transducers 5 arranged repetitively between the transducers 4 and connected in common to an electric signal source 1 and the 1st unidirectional electroacoustic transducers 6 arranged symmetrically to the outside of the transducers 4. The 2nd surface acoustic wave device B consists of the 2nd electroacoustic transducers 7, the 2nd acoustoelectric transducers 8 and the 2nd unidirectional acoustoelectric transducers 9. In this case, the effective pair number of the transducers 4, 7 is made equal and the 1st and 2nd surface acoustic wave devices A, B are arranged symmetrical. Thus, a large attenuation is ensured.

Inventors

• 👤 Kazuhito Kurosawa
• 👤 黒沢　和仁
• 👤 Mitsutaka Hikita
• 👤 光孝 疋田

Bibliographic Details