Acoustic mirror
First Claim
Patent Images
1. An acoustic mirror comprising:
- constituent layers comprising a layer having a thickness of substantially an odd multiple of λ
/4, where λ
corresponds to a length of an acoustic wave, the constituent layers comprising a single pair of layers, the single pair of layers comprising a first impedance layer and a second impedance layer,the first impedance layer comprising a first material having a first acoustic impedance and a first dielectric constant, the first material comprising at least one of aluminum nitride, gallium nitride, and zinc oxide,the second impedance layer comprising a second material having a second acoustic impedance and a second dielectric constant, the second material comprising a polymerized benzocyclobutene,the first acoustic impedance being higher than the second acoustic impedance, andthe first dielectric constant being higher than the second dielectric constant.
2 Assignments
0 Petitions
Accused Products
Abstract
An acoustic mirror includes constituent layers that are substantially odd multiples of λ/4. The constituent layers include a first impedance layer and a second impedance layer, where the first impedance layer includes a first material having a first acoustic impedance and a first dielectric constant, and the second impedance layer includes a second material having a second acoustic impedance and a second dielectric constant. The second acoustic impedance is higher than the first acoustic impedance, and the first dielectric constant is lower than the second dielectric constant.
93 Citations
20 Claims
-
1. An acoustic mirror comprising:
constituent layers comprising a layer having a thickness of substantially an odd multiple of λ
/4, where λ
corresponds to a length of an acoustic wave, the constituent layers comprising a single pair of layers, the single pair of layers comprising a first impedance layer and a second impedance layer,the first impedance layer comprising a first material having a first acoustic impedance and a first dielectric constant, the first material comprising at least one of aluminum nitride, gallium nitride, and zinc oxide, the second impedance layer comprising a second material having a second acoustic impedance and a second dielectric constant, the second material comprising a polymerized benzocyclobutene, the first acoustic impedance being higher than the second acoustic impedance, and the first dielectric constant being higher than the second dielectric constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
9. A duplexer comprising filters, the filters comprising first and second BAW resonators, each of the first and second BAW resonators comprising:
-
a substrate; a first impedance layer comprising a first material having a first acoustic impedance and a first dielectric constant, the first material comprising at least one of aluminum nitride, gallium nitride, and zinc oxide; a second impedance layer comprising a second material having a second acoustic impedance and a second dielectric constant, the second material comprising a polymerized benzocyclobutene; the first acoustic impedance being higher than the second acoustic impedance, and the first dielectric constant being higher than the second dielectric constant; electrode layers that are above the second impedance layer relative to the substrate; and a piezoelectric layer between the electrode layers. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification