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Surface acoustic wave arrangement with a junction region between surface acoustic wave structures having a decreasing then increasing finger period

  • US 6,420,946 B1
  • Filed: 04/27/2001
  • Issued: 07/16/2002
  • Est. Priority Date: 10/28/1998
  • Status: Expired
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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