Nonsymmetrical multistrip coupler as a surface-wave beam compressor of large bandwidth

Nonsymmetrical multistrip coupler as a surface-wave beam compressor of large bandwidth

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The equations for the performance of a multi strip coupler, in which the two tracks involved are of different geometries and acoustic characteristics, are presented in a convenient form that includes the effects of the strip length between the two tracks. Using this analysis, a beamwidth compressor, in which the trackwidths differ by a factor of ten, has been designed and constructed. Since the energy transfer from one track to the other is complete, the energy density in the acoustic beam is increased by a factor of ten over a very large operating bandwidth.


    1. 1)
      • F.G. Marshall , C.O. Newton , E.G.S. Paige . Surface acoustic wave multistrip components and their applications. IEEE Trans. , 216 - 236
    2. 2)
      • Blotekjaer, K., Ingebrigtsen, K.A., Skeie, H.: `Acoustic surface waves in piezoelectric materials with periodic metal strips on the surface', AE 190, ELAB Report, , (to be published).
    3. 3)
      • C. Maerfeld , P. Tournois . Perturbation theory for the surface-wave multistrip coupler. Electron. Lett. , 115 - 116

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