TY - GEN
T1 - First shear horizontal mode plate wave in LiNbO3 showing 20 km/s phase velocity
AU - Kadota, Michio
AU - Tanaka, Shuji
AU - Kimura, Tetsuya
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2015/11/13
Y1 - 2015/11/13
N2 - Currently, cognitive radio using a white space of digital TV (DTV) channels is receiving a lot of attention. One of the key devices of a cognitive radio handset is a tunable filter capable of adjusting frequency and bandwidth (BW) throughout DTV band. The authors developed ultra-wideband resonators in a DTV band and ultra-wideband filters fully covering all DTV channels using 0th shear horizontal mode plate wave (SH0) in a (0°, 120°, 0°) LiNbO3 plate. However, they are fabricated on a self-suspended ultra-thin LiNbO3 plate of only 0.5-0.6 μm in thickness, which is mechanically fragile and difficult to fabricate at high yield. A much higher phase velocity than that of SH0 is required to make the plate practically thicker. The objective of this study is to explore a different mode of plate wave showing much higher phase velocity and wide BW. By FEM simulation, it is clarified that a first SH mode (SH1) plate wave propagating in two kinds of new proposed structures, which are different from suitable SH0 mode structures for wide BW, has higher velocity than 20,000 m/s and wide BW of 24%.
AB - Currently, cognitive radio using a white space of digital TV (DTV) channels is receiving a lot of attention. One of the key devices of a cognitive radio handset is a tunable filter capable of adjusting frequency and bandwidth (BW) throughout DTV band. The authors developed ultra-wideband resonators in a DTV band and ultra-wideband filters fully covering all DTV channels using 0th shear horizontal mode plate wave (SH0) in a (0°, 120°, 0°) LiNbO3 plate. However, they are fabricated on a self-suspended ultra-thin LiNbO3 plate of only 0.5-0.6 μm in thickness, which is mechanically fragile and difficult to fabricate at high yield. A much higher phase velocity than that of SH0 is required to make the plate practically thicker. The objective of this study is to explore a different mode of plate wave showing much higher phase velocity and wide BW. By FEM simulation, it is clarified that a first SH mode (SH1) plate wave propagating in two kinds of new proposed structures, which are different from suitable SH0 mode structures for wide BW, has higher velocity than 20,000 m/s and wide BW of 24%.
KW - 1-th shear horizontal mode
KW - DTV
KW - high velocity
KW - new structure
KW - plate wave
KW - wide band
UR - http://www.scopus.com/inward/record.url?scp=84961988010&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84961988010&partnerID=8YFLogxK
U2 - 10.1109/ULTSYM.2015.0458
DO - 10.1109/ULTSYM.2015.0458
M3 - Conference contribution
AN - SCOPUS:84961988010
T3 - 2015 IEEE International Ultrasonics Symposium, IUS 2015
BT - 2015 IEEE International Ultrasonics Symposium, IUS 2015
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - IEEE International Ultrasonics Symposium, IUS 2015
Y2 - 21 October 2015 through 24 October 2015
ER -