METHOD OF DETERMINING RELATIVE DIELECTRIC PERMEABILITY AND ANGLE TANGENT OF DIELECTRIC LOSS OF DIELECTRIC STRUCTURE Russian patent published in 2020 - IPC G01R27/26 

FIELD: monitoring and measuring equipment.

SUBSTANCE: invention relates to control and measurement equipment and is intended for simultaneous determination of relative dielectric permeability and tangent of dielectric loss angle of dielectric structures in super-high frequency range, and can be used for nondestructive inspection of electrophysical parameters of produced dielectric substrates and structures for devices of microwave electronics. Invention is a method of determining relative dielectric permeability and tangent of dielectric loss angle of dielectric structures, involving arrangement of dielectric structure in the region of violation of periodicity of microwave photonic crystal, irradiation of a photonic crystal containing a measured dielectric structure, electromagnetic radiation of the microwave range, measurement of frequency dependences of transmission and reflection coefficients in the forbidden zone in the vicinity of the defect mode, calculation by means of computer of unknown values, at which theoretical frequency dependences of reflection and passage coefficients of electromagnetic radiation are closest to measured values, wherein, as the photonic crystal, a coaxial super-high-frequency photonic crystal is used, which is serially connected sections of the coaxial transmission line, space between outer and inner conductor of each section is completely filled with dielectric, wherein relative permittivity of dielectric filling varies periodically along direction of propagation of electromagnetic wave, selecting values of lengths and relative dielectric permittivities of dielectric fillings of alternating sections of the coaxial transmission line so as to provide a multiplicity of their electrical lengths, leading to formation of photonic forbidden zones of equal depth on frequency dependences of transmission coefficients of electromagnetic radiation, violation of the periodicity of the microwave photonic crystal is created in the central segment of the coaxial photonic crystal, which leads to formation of defect modes in several photonic forbidden zones, calculating distribution of electromagnetic wave field inside coaxial photonic crystal along direction of propagation of electromagnetic wave at frequencies corresponding to defective modes in photonic forbidden zones, fixing nodes and antinodes of standing electromagnetic wave inside coaxial photonic crystal, defective mode is selected, at frequency of which in the area of dielectric structure location in central section of coaxial photonic crystal there is antinode of standing wave.

EFFECT: technical result consists in expansion of functional capabilities of simultaneous determination of relative dielectric permeability and tangent of dielectric losses dielectric structures used as dielectric filling of super-high-frequency coaxial cables.

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