TY - JOUR
T1 - Very small-size resonator if filter using shear horizontal wave on quartz substrate
AU - Kadota, Michio
AU - Yoneda, Toshimaro
AU - Fujimoto, Koji
AU - Nakao, Takeshi
AU - Takata, Eiichi
PY - 2001/12/1
Y1 - 2001/12/1
N2 - A shear horizontal (SH) wave is excited by composing interdigital transducers (IDTs) and reflectors consisting of films made of heavy metal on ST cut 90°-X propagation quartz substrate (propagation direction is perpendicular to X-axis). This wave has a large electrochemical coupling factor, a large reflection coefficient and an excellent temperature characteristic. The square of the electromechanical coupling factor is 2.0∼2.6 times, the reflection coefficient at reflector's grating electrodes is 30 times as large as that of Rayleigh wave on an ST cut X propagation quartz substrate, and the temperature coefficient of frequency is equal to that. The authors applied this SH wave to filters for the first intermediate frequency (first IF) stage of a global system for mobile communications (GSM). As a result, we succeeded in developing the low loss and very small-sized filter (3×3×1.03mm; typical dimensions) having a high rejection out of band for the first time.
AB - A shear horizontal (SH) wave is excited by composing interdigital transducers (IDTs) and reflectors consisting of films made of heavy metal on ST cut 90°-X propagation quartz substrate (propagation direction is perpendicular to X-axis). This wave has a large electrochemical coupling factor, a large reflection coefficient and an excellent temperature characteristic. The square of the electromechanical coupling factor is 2.0∼2.6 times, the reflection coefficient at reflector's grating electrodes is 30 times as large as that of Rayleigh wave on an ST cut X propagation quartz substrate, and the temperature coefficient of frequency is equal to that. The authors applied this SH wave to filters for the first intermediate frequency (first IF) stage of a global system for mobile communications (GSM). As a result, we succeeded in developing the low loss and very small-sized filter (3×3×1.03mm; typical dimensions) having a high rejection out of band for the first time.
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M3 - Conference article
AN - SCOPUS:0035728751
VL - 1
SP - 65
EP - 68
JO - Proceedings - IEEE Ultrasonics Symposium
JF - Proceedings - IEEE Ultrasonics Symposium
SN - 1051-0117
T2 - 2001 Ultrasonics Symposium
Y2 - 6 October 2001 through 10 October 2001
ER -