| 摘要 |
<p>1,035,080. Piezo-electric filters. SONUS CORPORATION. June 3, 1965 [June 4, 1964], No. 23800/65. Heading H3U. A tuned coupling element comprises a pair of similar polarized ceramic transducers 14, 16 having, respectively, electrodes 20, 22 and 24, 26 connected to an A.C. source 12 and a load R L . In order to improve the transmission of of the pass band frequencies from transducer 14 to transducer 16 and to damp out spurious frequencies the transducers are connected by a member 18 of stiff rubber-like material secured by adhesive films 32, 34. As shown, the transducers 14, 16 and member 18 are of disc-form.</p> |
