|
|
|
Piezoelectricity is a linear effect.
Reversal of the electric field reverses the strain, i.e., the mechanical
deformation.
|
|
The electromechanical (also called
piezoelectric) coupling factor k is an important characteristic of a
piezoelectric material; k is between zero and one and is dimensionless, e.g.,
k = 8.8% for AT-cut quartz, and k = 4.99% for SC-cut quartz. It is a measure
of the efficacy of piezoelectric transduction, and it is a determinant of
important device characteristics such as filter bandwidth, insertion loss,
and the location and spacings of resonators' critical frequencies (e.g., the
series resonance to antiresonance frequency spacing).
|
|
|
|
----------------------------
|
|
W. G. Cady, Piezoelectricity,
Dover Publications, Inc., New York, 1964.
|
|
|
|
A. Ballato, Piezoelectricity:
Venerable Effects, Modern Thrusts, Army Research Laboratory Technical
Report ARL-TR-70, August 1994.
Available from NTIS, and among the “Review Papers” at www.ieee-uffc.org/fc
|
|
|
|
G. S. Kino, Acoustic
Waves: Devices, Imaging, and Analog Signal Processing, Prentice-Hall,
Inc., 1964. This book is available
on-line to IEEE UFFC-S members at www.ieee-uffc.org/archive
|
|
|
|
|
|
|
