Retrieving the reflection coefficient of a sample from the frequency response of a special open resonator




composite materials, electromagnetic reflection, frequency response, measurement errors


This paper focuses on accurate measuring the electromagnetic reflection at K band from flat samples made of a composite material or a metal mesh. A special open resonator comprising a sample under test features a good sensitivity due to multiple reflections in the cavity and absence of any contact between the sample and the installation. Data processing algorithm arises from geometric optics description of the microwave field in the resonator. Digital modeling with the CST Microwave Studio software and real experiments with use of ZVA50 signal analyzer confirmed efficiency of the proposed technique.


S. V. Reznik, “Advanced directions of research in the field of composite structures for Space antennas,” Proc. of 3rd Int. Conf. on Composite Materials and Technologies for Aerospace Applications, Wrexham, North Wales, p. 7-11, 2013.

C. A. Balanis, Antenna Theory: Analysis and Design, 4th ed. New York: Wiley & Sons, 2005.

Yu. Choni, A. Romanov, T. Ajupov, et al., “Method and apparatus for measurement of a flat sample’s reflection coefficient at high frequencies,” RU Patent 2 503 021 (2013).

M. A. Buchstab, “Measuring with multiple reflections,” in Measurements of Low Optical Losses [in Russian]. Leningrad: Energoatomizdat, p. 39-56, 1988.

Yu. I. Choni, V. N. Lavrushev, A. G. Romanov, “Accurate measurement of the reflection coefficient of microwave reflectors,” Proc. ISEEE-2014, Sapporo, Hokkaido. IEEE, 2014, p. 660-664. DOI:

Yu. I. Choni, “Adjoint operator method and its aspects in regard to antenna synthesis,” Proc. IX Int. Conf. on Antenna Theory and Tech., ICATT-2013, Odessa, Ukraine. IEEE, 2013, p. 86-91. DOI:





Measurements and applications of microwave technologies