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Surface-acoustic-wave unidirectional transducers using anodic oxidation technology and low-loss filters

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3 Author(s)
Yamanouchi, K. ; Tohoku Univ., Sendai, Japan ; Meguro, T. ; Matsumoto, K.

A new surface-acoustic-wave interdigital transducer (IDT) and unidirectional transducer (UDT) are described. Using a lift-off anodic oxidation method, controllable gaps between electrodes with good insulation can be obtained. Experimental results show good characteristics at 2nd-harmonic operation for a new floating electrode type unidirectional transducer (NG-FEUDT). Also, a low-loss filter of 3.46 dB with side-lobe suppression of 40 dB at 893 MHz is obtained using the above techniques.

Published in:

Electronics Letters  (Volume:25 ,  Issue: 15 )