GB/T 35679-2017 in English

VALID

Measuring method for electromagnetic parameters of solid materials at microwave frequencies using waveguide

Issued on:2017-12-29
Implemented on:2018-07-01
File Format:PDF
Delivery:Via email within 5 business days

Price(USD)： $370.00
$359.00

Standard No:	GB/T 35679-2017
Document status:	VALID
Title in English:	Measuring method for electromagnetic parameters of solid materials at microwave frequencies using waveguide
Title in Chinese:	固体材料微波频段使用波导装置的电磁参数测量方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2017-12-29
Implemented on:	2018-07-01
ICS Classification:	29.035.01-Insulating materials in general
Chinese Classification:	K15-Electrical insulating material and its products
Professional Classification:	GB-National Standard
Related Keywords:	solid materials measured sample waveguide deviceinsertion loss≤0.1db waveguide coaxial isotropic non-gyromagnetic solid materials iterative method waveguide measurement system sample size accuracy control
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《GB/T 35679-2017固体材料微波频段使用波导装置的电磁参数测量方法》由TC323（全国电磁屏蔽材料标准化技术委员会）归口，主管部门为中国电器工业协会。

Introduction

Analysis of the core content of the standard

This standard specifies a systematic method for measuring the complex relative permittivity (ε_r) and complex relative permeability (μ_r) of isotropic non-gyromagnetic solid materials using a waveguide device in the frequency band of 100MHz-40GHz. Focus on solving the following technical problems:

Construction and calibration requirements of waveguide measurement system
Sample size accuracy control (width/height tolerance ±0.05mm~±2.0mm)
Air gap correction model (series capacitor model)
Applicable scenarios of four types of electromagnetic parameter calculation algorithms

Technical requirements of measurement system

Equipment type	Key indicators	Allowance deviation
Vector network analyzer	Dynamic range	≥20dB loss of measured sample
Waveguide device	Insertion loss	≤0.1dB
Waveguide coaxial converter	Standing wave ratio	≤1.25
Length measuring instrument	Micrometer screw	±0.001mm

Environmental control requirements:Temperature (23±5)℃, humidity ≤65%, power supply (220±10)V/(50±1)Hz, electromagnetic shielding room is required to eliminate environmental interference.

Comparison of electromagnetic parameter calculation algorithms

Calculation method	Required S parameters	Applicable materials	Calculation complexity
Transmission-reflection method (NRW)	S₁₁,S₂₁	General	Medium
Simplified transmission-reflection method	S₁₁,S₂₁	Non-magnetic (μ_r=1)	Simple
Iterative Four-Parameter Method	Full S-Parameters	High Loss Materials	Complex
Iterative Single-Parameter Method	S₂₁	Known μ_r Materials	Medium

Algorithm Selection Suggestions:For low-loss materials, the NRW method is preferred; when the sample positioning is inaccurate, the iterative method is used; for non-magnetic materials, the simplified method can be used to improve efficiency.

Technological evolution and standard value

Main innovations of this standard compared with ASTM D5568-14:

Extended frequency lower limit to 100MHz (original standard ≥500MHz)
New iterative single parameter algorithm to simplify non-magnetic material testing
Clear series capacitance model for air gap correction
Refine sample size tolerance classification (by frequency band)

Implementation suggestions

Key control points:

Strict control of dimensional tolerance during sample preparation (refer to Appendix A Table A.3)
Network analyzer calibration interval shall not exceed 1 hour
PTFE reference sample verification system shall be preferred
When |Γ|>0.9, the matching between the sample and the waveguide needs to be checked

Typical application scenarios:Electromagnetic performance testing of 5G communication materials, radar absorbing materials, and aerospace composite materials.

More samples: QC/T 942-2021 DL/T 368-2010 GB 50021-2001(2009)

Sample only — not a preview of GB/T 35679-2017

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