Perturbation theory for the surface-wave multistrip coupler

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Perturbation theory for the surface-wave multistrip coupler

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A space-harmonic perturbation theory is presented for the multistrip coupler which does not require any adjustment parameters and which gives the dispersion relations separately for the symmetric and for the antisymmetric modes. The agreement with experimental results for different widths and spacings of the strips is very good when the number of strips per wavelength is greater than two, but is not as good for smaller values, because the effects of the reflected wave and of the radiated bulk waves have been neglected.

Inspec keywords: perturbation theory; acoustic surface wave devices; waveguide couplers; solid-state microwave circuits

Other keywords: perturbation theory; surface wave multistrip coupler

Subjects: Acoustic wave devices; Waveguide and microwave transmission line components

References

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      • J.D. Maines , F.G. Marshall , J.F.C. Oliver , E.G.S. Paige . Frequency-dependent behaviour of an acoustic-surface-wave multistrip coupler. Electron. Lett. , 81 - 82
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      • W.R. Smith , H.M. Gerard , J.H. Collins , T.M. Reeder , H.J. Shaw . Analysis of interdigital surface-wave transducers by use of an equivalent circuit model. IEEE Trans. , 856 - 864
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      • Auld, B.A.: `Surface-wave theory', Proceedings of the ultrasonics symposium, 1970, San Francisco, USA.
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      • F.G. Marshall , E.G.S. Paige . Observed properties of an acoustic-surface-wave multistrip coupler. Electron. Lett. , 463 - 464
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      • F.G. Marshall , E.G.S. Paige . Novel acoustic-surface-wave directional coupler with diverse applications. Electron. Lett. , 460 - 462
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      • K.M. Lakin . Perturbation theory for electromagnetic coupling to elastic surface-waves on piezoelectric substrates. J. Appl. Phys. , 899 - 906
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