Yu. G. Makeev

On the anisotropy of dielectric permittivity in single crystal lanthanum aluminate substrates

The dielectric properties of LaAlO3 single crystal plates were studied by microwave techniques in a frequency range from 20 to 28 GHz. The measurements were performed using a resonator representing crossed round (cylindrical) and radial evanescent waveguides with the polarization-degenerate fundamental oscillation mode. Various single crystal samples, including those obtained from different manufacturers, exhibit anisotropy in the (100) crystal plane, whereby the permittivity varies within Δε=0.1–0.9.

Measuring the Electric Parameters of Dielectrics at Microwave Frequencies

A technique for the local determination of the permittivities of substances, which uses resonance features of polarization-degenerated HE electromagnetic oscillations in a structure formed by an orthogonal junction of crossed evanescent cylindrical and radial waveguides, is considered. A sample of an isotropic or anisotropic dielectric (a plate of arbitrary shape and size) is placed into the intersection region and partially into the radial waveguide. Permittivities of Ftoroplast-4 fluoroplastic, fused quartz, single-crystal quartz, and other dielectrics measured in a frequency band of 10–70 GHz are presented.

Magnetic modes in a resonator built around a circular evanescent waveguide and coaxial line

AbstractThe eigenfrequencies of magnetic modes in a resonator made up of two segments of a circular evanescent waveguide and a coaxial line are found by solving an electrodynamic problem. For the fundamental

A Waveguide-Based Filled Cylindrical Resonator: Investigation of Electric Properties

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Characteristics of Magnetic Type Oscillations in Waveguide-Coaxial Resonator

mode, the performance of the resonator is studied analytically and experimentally over a wide range of its parameters. The feasibility of a high-power microwave semiconductor oscillator based on the resonator under study is demonstrated.

The Waveguide-Based Dielectric Resonator Operating in Symmetric TE-Modes

A spectral three-dimensional problem is solved to determine the resonant frequencies of a branch formed by the orthogonal intersection of cutoff rectangular waveguides. Expressions for the Hmng and Emng modes are derived and analyzed. Two classes of free nonradiating modes typical of this structure are identified and analyzed. Numerical calculations are made of the dispersion relations obtained for the different modes.