[射频]Unidirectional SAW Transducer for Gigahertz Frequencies

1404 lEEE TRANSACTIONS ON ULTMSONICS. FERROELECTRICS, AND FREQUENCY CONTROL, VOL. 50, NO. 11, NOVEMBER 2003 G 2L?j  
Letters - nqX)+{wAXe  
Unidirectional SAW Transducer for Gigahertz UOTM>d1P  
Frequencies o'
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Saku Lehtonen, Victor P. Plessky, Senior Member, IEEE, @k_xA-a  
Clinton S. Hartmann, Member, IEEE, C^sHj5\(  
and Martti M. Salomaa, Member, IEEE }%z {tn  
Abstract-A single-phase unidirectional transducer I"/p^@IX  
(SPUDT) structure using X/4 and wider electrodes is introduced. $2
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The considerable difference between the refleetivity y_bb//IAG  
of short-circuited X/4 electrodes and that of floating _=ani9E]uF  
X/2-wide electrodes on 128' lithium niobate (LiNbOs) is V-Ebi^gz5W  
exploited. The surface acoustic wave (SAW) device operating CF|c4oY82  
at 2.45 GHz has crit .. Uj5%06  
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