GB/T 42741-2023 Measuring method for electromagnetic parameters of solid materials using air-freespace
1 Scope
This document describes the general requirements and measuring methods for electromagnetic parameters of solid materials using the air-freespace method in the frequency range from 2 GHz to 110 GHz.
This document is applicable to the measurement of complex relative permittivity, complex relative magnetic permeability and other parameters of homogeneous and isotropic solid materials using the air-freespace method.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2900.74-2008 Electrotechnical terminology - Circuit theory
GB/T 4365 Electrotechnical terminology - Electromagnetic compatibility
GB/T 35679-2017 Measuring method for electromagnetic parameters of solid materials at microwave frequencies using waveguide
3 Terms and definitions
For the purpose of this document, the terms and definitions given in GB/T 2900.74-2008, GB/T 4365 and GB/T 35679-2017 and the following apply.
3.1
complex relative permittivity
εr
Calculated by using formula (1):
(1)
where,
j—— Imaginary number symbol;
εr—— Complex relative permittivity;
ε′r—— Real part of complex relative permittivity;
ε″r—— Imaginary part of complex relative permittivity;
ε0—— Vacuum permittivity, approximately equal to 8.85×10-¹² F/m;
—— Electrical displacement vector, C/m²;
—— Electric field intensity vector, V/m.
Note 1: The complex relative permittivity of solid materials is determined by molecular polarization characteristics, charge movement characteristics and others. The solid material that this method applies is an isotropic solid material. Therefore, the complex relative permittivity at each frequency point is a single complex number. For anisotropic media, the complex relative permittivity is a three-dimensional spatial tensor.
Note 2: Isotropy refers to the isotropy of electromagnetic characteristics.
[Source: GB/T 35679- 2017, 3.3, modified]
3.2
complex relative magnetic permeability
μr
Calculated by using formula (2):
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviations
5 General
6 Method of measurement
7 Test report
Annex A (Informative) Data recording form for the air-freespace method (sample)
