Method for measuring dielectric constant of dielectric and method for verifying validity of the method

The method addresses measurement errors in conventional dielectric constant methods by iteratively refining permittivity estimates using complex electric field distributions and coupling coefficients, achieving accurate dielectric constant measurements with small samples.

JP2026003242APending Publication Date: 2026-01-13INTER UNIV RES INST NAT INST OF NATURAL SCI
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Patent Information

Application Number
JP2024101099
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-06-24
Publication Date
2026-01-13

AI Technical Summary

Technical Problem

Conventional methods for measuring the dielectric constant of materials, such as the resonator method and free-space method, suffer from measurement errors due to the resonator size limitations and plane wave approximation, respectively.

Method used

A dielectric constant measurement method using a system with a transmitter, receiver, and dielectric between antennas, involving steps of calculating complex electric field distributions, angular spectrum distributions, and electric field coupling coefficients to reduce measurement errors by iteratively refining the estimated permittivity based on amplitude and phase measurements.

Benefits of technology

This method significantly reduces measurement errors associated with plane wave approximation and allows accurate dielectric constant measurement without requiring large dielectric samples, enabling precise determination of complex permittivity.

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Abstract

To provide a dielectric constant measuring method for reducing an analysis error of a dielectric constant in measurement by a free space method.SOLUTION: The method includes a step of preparing a first complex electric field distribution on an incident plane P1 of a dielectric sample 33, a step of preparing a second complex electric field distribution on an emission plane P2 of an electromagnetic wave transmitted from a receiving horn antenna and assumed to be incident on the dielectric sample 33 in a direction opposite to an emission direction of the electromagnetic wave, a step of calculating an angular spectrum distribution on a wave number space by inverse Fourier transformation of the first complex electric field distribution, a step of measuring a thickness of the dielectric sample 33 in a direction along an electromagnetic wave transmission direction, a step of calculating a reference of a complex electric field distribution which is a complex electric field distribution when the electromagnetic wave propagates in a free space by a distance corresponding to the thickness, and a step of obtaining a third complex electric field distribution of the electromagnetic wave propagating in the emission direction on the emission plane P2.SELECTED DRAWING: Figure 2
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