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Title:
ELASTIC SURFACE WAVE DEVICE
Document Type and Number:
Japanese Patent JPS59188219
Kind Code:
A
Abstract:

PURPOSE: To suppress a TTE level and reduce a ripple in a passing band by setting the conversion loss of an input transducer greater than that of an output transducer.

CONSTITUTION: Interdigital type input and output transducers 2 and 3 are provided on one surface of a ceramic substrate 1. For example, the input transducer 2 has 13 couples and the output transducer 3 has 3 couples so that R0 (reciprocal of output conductance of output transducer) >2RI (reciprocal of conductance of circuit coupled with output transducer). For example, only the input transducer 2 is weighted in order to video intermediate filter characteristics. Then, the impedance values of both transducers are so set that conversion loss of the input transducer is larger than that of the output transducer.


Inventors:
Takahashi, Sadao
Kodama, Riichi
Ehata, Yasuo
Izumi, Hirohiko
Application Number:
JP1984000040570
Publication Date:
October 25, 1984
Filing Date:
March 05, 1984
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
H03H9/145; H03H3/08; H03H9/02; H03H9/64; (IPC1-7): H03H9/145



 
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