[射频]Unidirectional SAW Transducer for Gigahertz Frequencies

1404 lEEE TRANSACTIONS ON ULTMSONICS. FERROELECTRICS, AND FREQUENCY CONTROL, VOL. 50, NO. 11, NOVEMBER 2003 %Pa-fee  
Letters - GmAE!+"  
Unidirectional SAW Transducer for Gigahertz CdZ;ZR  
Frequencies WK;p[u?~xi  
Saku Lehtonen, Victor P. Plessky, Senior Member, IEEE, 0QC*Z (  
Clinton S. Hartmann, Member, IEEE, r{%NMj  
and Martti M. Salomaa, Member, IEEE @Zq,mPaR$  
Abstract-A single-phase unidirectional transducer ` |]6<<'iW  
(SPUDT) structure using X/4 and wider electrodes is introduced. lq.0?(  
The considerable difference between the refleetivity "g=ux^+X\  
of short-circuited X/4 electrodes and that of floating N`iK1n4X  
X/2-wide electrodes on 128' lithium niobate (LiNbOs) is ew`R=<mZ,7  
exploited. The surface acoustic wave (SAW) device operating 6_XX[.%  
at 2.45 GHz has crit .. zLxWyPM0;  
W_sDF; JP  

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