Abstract
The propagation characteristics of surface acoustic waves (SAWs) on rotated Y-cut X-propagating 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3(PMN-33%PT) substrate are theoretically analyzed. It is shown that besides the existence of a shear horizontal (SH) SAW with ultrahigh electromechanical coupling factor K2, a Rayleigh SAW also exists causing strong spurious response. The calculated results showed that the spurious Rayleigh SAW can be sufficiently suppressed by properly selecting electrode and its thickness with optimized rotating angle while maintaining large K2 of SH SAW. The fractional -3 dB bandwidth of 47% is achievable for the ladder type filter constructed by Au IDT/48oYX-PMN-33%PT resonators.
Highlights
ARTICLES YOU MAY BE INTERESTED INXiaojun Ji,[1] Qiang Xiao,[1] Jing Chen,1,a Hualei Wang,[2] Tatsuya Omori,[2] and Ahn Changjun2 1Department of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China 2Graduate School of Engineering, Chiba University, Inage-ku, Chiba-shi 263-8522, Japan (Received 24 April 2017; accepted 15 May 2017; published online 24 May 2017)
Relaxor based ferroelectric single crystals, (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) and (1-x)Pb(Zn1/3Nb2/3)O3-xPbTiO3 (PZN-xPT) single crystals exhibit ultrahigh electromechanical coupling factor k33(>94%) and piezoelectric constant d33 (>2500pC/N) near the morphotropic phase boundary (MPB) at room temperature after being poled along [001] of the cubic coordinates.[1,2,3] The drawback of PMN-33%PT single crystal is the relatively low Curie temperature (∼150°C) and rhombohedral to tetragonal phase transition temperature (∼80°C), which can be improved by ternary compound Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3
We evaluated the K2 dependence on the rotating angle θ to obtain the optimal cut for achieving large K2 for the shear horizontal (SH) SAW and small K2 for the Rayleigh SAW
Summary
Xiaojun Ji,[1] Qiang Xiao,[1] Jing Chen,1,a Hualei Wang,[2] Tatsuya Omori,[2] and Ahn Changjun2 1Department of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China 2Graduate School of Engineering, Chiba University, Inage-ku, Chiba-shi 263-8522, Japan (Received 24 April 2017; accepted 15 May 2017; published online 24 May 2017)
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