Piezoelectric microwave resonator using lateral excitation
First Claim
1. A piezoelectric resonator activated by a lateral excitation, comprising:
- a body of piezoelectric material including a pair of opposing major faces; and
means for providing lateral excitation of said body of piezoelectric material, said means including a pair of spaced recesses on opposite sides of a central open area of said body, a pair of electrodes located in said recesses on said opposite sides, a surface of said area between said electrodes being raised above the uppermost level of said electrodes, and signal generator means connected to said electrodes on said opposite sides to apply said lateral excitation, said central area providing a piezoelectric gap region for energy trapping in said central area of said body.
1 Assignment
0 Petitions
Accused Products
Abstract
An improvement in piezoelectric crystal resonators using lateral excitation whereby energy of vibration trapped in a region between the electrodes is provided by the inclusion of recessed electrodes adjacent a relatively raised piezoelectric region on at least one major face or surface of the crystal. The recessed electrodes oppose one another in either a horizontal or a vertical direction to generate a lateral field in the body of the crystal upon excitation. Additionally, curved edge interfaces are provided between the recessed electrodes and the piezoelectric crystal material to reduce field gradients. Tapered electrodes which have the effect of increasing the energy trapping in the gap between the electrodes are also disclosed.
-
Citations
40 Claims
-
1. A piezoelectric resonator activated by a lateral excitation, comprising:
-
a body of piezoelectric material including a pair of opposing major faces; and means for providing lateral excitation of said body of piezoelectric material, said means including a pair of spaced recesses on opposite sides of a central open area of said body, a pair of electrodes located in said recesses on said opposite sides, a surface of said area between said electrodes being raised above the uppermost level of said electrodes, and signal generator means connected to said electrodes on said opposite sides to apply said lateral excitation, said central area providing a piezoelectric gap region for energy trapping in said central area of said body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 36, 37, 38, 39, 40)
-
-
35. The resonator as defined by c1aim 11 wherein said body has a convex-convex configuration.
Specification