Surface acoustic wave arrangement with a junction region between surface acoustic wave structures having a decreasing then increasing finger period
First Claim
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1. A surface acoustic wave arrangement comprising a piezoelectric substrate;
- at least two surface acoustic wave structures being fitted on the substrate, said structures being arranged one behind the other in a propagation direction of the surface acoustic waves and having metallic fingers with a first and second finger period, said two surface acoustic wave structures having differences selected from different phase, different finger period, and a combination of different phase and different finger period;
fingers at the ends of the two surface acoustic wave structures forming a junction region from a first of the two surface acoustic wave structures to a second of the two surface acoustic wave structures, the local finger period of the first surface acoustic wave structure initially decreasing continuously in the junction region and finally rising continuously again until the finger period of the second surface acoustic wave structure is reached.
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Abstract
In order to reduce scattering losses during the transmission of a surface acoustic wave signal, a surface acoustic wave arrangement has a junction between two mutually offset surface acoustic wave structures designed so that the finger period is reduced in the region of the junction, and varies continuously in the region of the junction.
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15 Claims
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1. A surface acoustic wave arrangement comprising a piezoelectric substrate;
- at least two surface acoustic wave structures being fitted on the substrate, said structures being arranged one behind the other in a propagation direction of the surface acoustic waves and having metallic fingers with a first and second finger period, said two surface acoustic wave structures having differences selected from different phase, different finger period, and a combination of different phase and different finger period;
fingers at the ends of the two surface acoustic wave structures forming a junction region from a first of the two surface acoustic wave structures to a second of the two surface acoustic wave structures, the local finger period of the first surface acoustic wave structure initially decreasing continuously in the junction region and finally rising continuously again until the finger period of the second surface acoustic wave structure is reached. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- at least two surface acoustic wave structures being fitted on the substrate, said structures being arranged one behind the other in a propagation direction of the surface acoustic waves and having metallic fingers with a first and second finger period, said two surface acoustic wave structures having differences selected from different phase, different finger period, and a combination of different phase and different finger period;
Specification