[无源]SPUDT Filters for the 2.45 GHz ISM Band

ieee transactions on ultrasonics, ferroelectrics, and frequency control, vol. 51, no. 12, december 2004 1697 +oL@pp0  
SPUDT Filters for the 2.45 GHz ISM Band ? PpS4Rd  
Saku Lehtonen, Victor P. Plessky, Senior Member, IEEE, Clinton S. Hartmann, Member, IEEE, and IIAmx[ b  
Martti M. Salomaa, Member, IEEE ydAiH*>  
Abstract—Filters based on using single-phase, unidirectional qdxaP% p2  
transducers (SPUDT) consisting of 􀀀4 and wider qwO@>wQ}~  
electrodes are presented. The design variants exploit the g!9|1z  
significant difference between the reflectivity of shortcircuited u(\O@5a  
􀀀4 electrodes and that of floating wide electrodes 8)ng> l  
on 128􀀀 lithium niobate (LiNbO3). The surface acoustic NB+/S;`  
wave (SAW) devices operating at 2.45 GHz have critical dlIYzO<  
dimensions of about 0.3–0.4 m, accessible to standard optical i4nFjz  
lithography. When matched, the fabricated SPUDT NCl@C$W
9q  
filters exhibit minimum insertion losses of 5.5–7.9 dB together i83[':  
with 3 dB passbands of 89–102 MHz. The majority 2U(q
yC  
of the insertion loss can be attributed to the attenuatio .. \f)GW$`  
Lj3Pp$h  

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楼主好意，在此谢过 =4a:)g'