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Planar dielectric emitters for EHF systems for diagnostics of fast processes

Keywords:

V. F. Vzyatyshev – Dr.Sc. (Eng.), Professor of Department «Fundamentals of Radio Engineering» of National Research University «Moscow Power Engineering Institute». E-mail: vitaidea@yandex.ru Ye. Yu. Gaynulina – Research Engineer of 3rd category, FSUE FRPC “Measuring System Research Institute n.a. Yu.Ye. Sedakov” (Nizhny Novgorod). E-mail: okatrin@list.ru A. V. Nazarov – Ph.D. (Eng.), Associate Professor, Senior Research Scientist, FSUE FRPC “Measuring System Research Institute n.a. Yu.Ye. Sedakov” (Nizhny Novgorod. E-mail: nazarov52@mail.ru A. A. Sedov – Senior Research Scientist, FSUE «Russian Federal Nuclear Center – The All-Russian Research Institute of Experimental Physics» (Sarov). E-mail: aasedov@gmail.com V. V. Shtykov – Ph.D. (Eng.), Associate Professor, Professor of Department «Fundamentals of Radio Engineering» of National Research University «Moscow Power Engineering Institute». E-mail: shtykovvv@yandex.ru


Currently one of the topical problems of diagnostics of fast gas-dynamic processes and experimental ballistics is the task of the re-construction of the object surface shape. This problem can be solved with the use of a multichannel radio interferometer (MRI). Since the number of MRI channels is limited, it’s important to provide such a form of amplitude-phase distribution (APD) of the probing field on the surface of the object, which doesn’t reduce the reliability of the information extracted from the signals of the MRI channels. The feature of the use of the MRI in experimental ballistics is the fact that in the vast majority of cases the object is in the near or intermediate field of the interferometer antenna. In the article it has been shown that as the MRI antenna it’s advisable to use a planar dielectric emitter generating the probing field with the APD along one of the transverse coordinates as a function of Gauss–Hermite of zero order, consisting of a stimulating single-mode rectangular dielectric waveguide (RDW), a wedge-shaped transition and a segment of multimode wide format RDW (WRDW) with inhomogeneities in the form of two narrow through slits. The desired APD may be obtained by summing the modes excited in WRDW. Selection of the modes amplitudes is done by choosing the configuration, sizes and position of the slits. To ensure in-phase addition of the modes at the end (aperture) of the emitter a phase corrector is used. The article presents the results of calculations using the coupled-mode equations, numerical simulation and experimental study of the proposed emitter. It has been shown that taking into account the error of the measurements the APD generated by the emitter coincides with the distribution of Gauss–Hermite of zero order at the distances from the aperture from 20 to 100 mm.
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May 29, 2020

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