- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Electromagnetic Wave Absorbers (Detailed Theories and Applications) || Measurement Methods on <scp>EM</scp> ‐Wave Absorbers
摘要： In order to deepen our knowledge of the electromagnetic (EM)-wave absorber design, it becomes important to accurately know the material characteristics and the characteristics of the absorber itself. In this chapter, after describing the measurement methods of material constants, the measurement methods of EM-wave absorber characteristics are described. In particular, we intend here to explain in detail the measurement methods of material constants, including conventional methods together with analytical methods. In Section 7.1, as the methods of measuring the material constants for wave-absorbing materials, the methods of using a rectangle waveguide, coaxial waveguide, and microwave resonators are described. First, measurement methods based on the standing-wave method using the rectangular waveguide and coaxial waveguide are studied. Second, in the microwave resonator methods for cylindrical cavities, the measurement methods of dielectric constant and conductivity in the lossless case, complex permittivity, and complex permeability are investigated theoretically. In Section 7.2, as a method for measuring the EM-wave absorber characteristics, the method of TEM mode transmission lines such as coaxial waveguides, strip lines, and TEM cells are examined first. Then, the waveguide method, as a special case, is described, along with space standing-wave methods.
关键词： cavity resonator method,EM-wave absorber,TEM mode transmission line,material constants,measurement methods,waveguide method,space standing-wave method,standing-wave method
更新于2025-09-19 17:13:59
-
[IEEE 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Rome, Italy (2019.6.17-2019.6.20)] 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Measurement of Electromagnetic Characteristics Materials in a Rectangular Waveguide
摘要： A waveguide method for measuring the relative complex dielectric constant of ?at samples of insulating materials that is invariant to the position of the sample over a waveguide section is discussed. The exclusion of the e?ect of coaxial-waveguide transitions on the measurement results is performed by the LR method. The measured parameters are determined in the frequency range by minimizing the objective function.
关键词： frequency range,LR method,waveguide method,complex dielectric constant,insulating materials
更新于2025-09-19 17:13:59