Abstract
A family of exact solutions of the two-dimensional Helmholtz equation is constructed, which are suitable for describing wavefields in transition zones arising in Fresnel-type diffraction. As examples, in addition to wedge diffraction, high-frequency asymptotics of the field in problems of diffraction on obstacles with non-smooth curvature are considered.
Notes
Interpretation of mathematical expressions for wavefields implies the harmonic time-dependence \({\text{exp}}\left( { - i\omega t} \right)\), where \(t\) is time and \(\omega \) is angular frequency.
Parabolic coordinates are useful in such problems, since in the region (1), (6) the phase difference \(kr - kx\) can be considered constant on parabolas \(x = C{{y}^{2}}\).
The difference of phases of the waves is constant along these lines, \(r{\kern 1pt}^{'} - r = {\text{const}}\).
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ACKNOWLEDGMENTS
The authors are indebted to the participants of the All-Russian Seminar “Mathematical Modeling of Wave Processes” (Russian New University, Moscow) and personally to D.S. Lukin, A.S. Kryukovsky, E.A. Palkin, V.T. Polyakov, and A.V. Popov for a helpful discussion of the results.
Funding
The work was supported by the Russian Science Foundation, grant no.: 22-21-00557.
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Zlobina, E.A., Kiselev, A.P. Fresnel-Type Transition Zones. J. Commun. Technol. Electron. 68, 639–648 (2023). https://doi.org/10.1134/S1064226923060190
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DOI: https://doi.org/10.1134/S1064226923060190