[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 W/fM0=!  
SPUDT Filters for the 2.45 GHz ISM Band a}MOhM6T  
Saku Lehtonen, Victor P. Plessky, Senior Member, IEEE, Clinton S. Hartmann, Member, IEEE, and )5bhyzSZI  
Martti M. Salomaa, Member, IEEE nc([e9_9v  
Abstract—Filters based on using single-phase, unidirectional x_#yH3kJ  
transducers (SPUDT) consisting of 􀀀4 and wider $lUZm\R|k  
electrodes are presented. The design variants exploit the jMgNi@  
significant difference between the reflectivity of shortcircuited ?eeE[F  
􀀀4 electrodes and that of floating wide electrodes +>{{91mN  
on 128􀀀 lithium niobate (LiNbO3). The surface acoustic : wb\N'b  
wave (SAW) devices operating at 2.45 GHz have critical ?9/%K45  
dimensions of about 0.3–0.4 m, accessible to standard optical e-x{7  
lithography. When matched, the fabricated SPUDT b>G!K)MS3  
filters exhibit minimum insertion losses of 5.5–7.9 dB together \\BblzGMR  
with 3 dB passbands of 89–102 MHz. The majority DLf6D |"  
of the insertion loss can be attributed to the attenuatio .. 1Hzj-u&N/  
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楼主好意，在此谢过 9YwK1[G6/