Portable Microwave Reflection Coefficient Meter of Coatings
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TRODYNAMICS AND WAVE PROPAGATION
Portable Microwave Reflection Coefficient Meter of Coatings K. M. Baskova, D. E. Danilovb, A. A. Politikoa, S. E. Prosypkinb,*, A. A. Rogozinb, V. N. Semenenkoa, and V. A. Chistyaeva aInstitute
of Theoretical and Applied Electromagnetics, Russian Academy of Sciences, Moscow, 125412 Russia bRohde & Schwarz LLC, Moscow, 117335 Russia *e-mail: [email protected] Received August 13, 2019; revised February 4, 2020; accepted February 20, 2020
Abstract—In this study, we propose a new design of a portable meter of reflection coefficients of radar absorbing coatings. An experimental comparison of the reflectivity meters of the new and traditional types is performed. The technical, operational, and cost advantages of a meter of a new type are shown. The efficiency of the meter calibration system was developed and proven, and the optimal geometric parameters of the antenna probe that ensures high-accuracy measurements of the reflection coefficient of radar absorbing coatings were determined. DOI: 10.1134/S1064226920090028
INTRODUCTION The current stage of development of ultra-wideband antenna technology is characterized by the widespread use of radar absorbing coatings having low reflection coefficient (RC) values in the operating frequency band of the microwave range [1]. These coatings help to significantly improve the characteristics of the antennas: to increase the noise immunity of the antennas and stabilize the width of the main lobe of the antenna pattern in the frequency band. Depending on their specific purpose, such radar absorbing coatings can be highly efficient both at allocated (fixed) frequencies and in individual frequency ranges. The application of radar absorbing coatings to large-size antennas and other objects of antenna technology is a very complex and time-consuming procedure in the process of which it is necessary to solve technological and radiophysical problems. As for the radiophysical component of coating technology, the control of radar absorbing coatings is normally performed directly in the process of applying them to the antenna. Besides, radiophysical monitoring is necessary after coating to assess their quality during antenna operation. In most cases, the most informative measured parameter during radiophysical monitoring is the frequency dependence of the RC of a coating. In practice, a situation when it is impossible to perform measurements under laboratory conditions at stationary stands often arises. In such cases, for the implementation of radiophysical monitoring directly on the product, a mobile measuring complex is required [2]. As an option, a portable coating RC meter that allows evaluating the compliance of coating parameters with the specified technical characteristics
may be used for these purposes. Such a RC coating meter has a number of requirements: small size and weight, the ability to operate outdoors, ease of use, low cost, wide, at least a 40 dB dynamic range, the ability to measure in a wide frequency band, etc. The advent of portable
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