Abstract
AbstractWhen the measurement wavelength becomes longer, it becomes difficult to maintain a sufficient measurement space in the spatial standing wave method used for reflection coefficient measurement of electromagnetic wave absorbers. To date, a reflection coefficient measurement method using a spherical wave within a rather narrow space has been proposed. However, no theoretical verification has been carried out. In this paper, the spatial standing wave is analyzed by the physical optics approximation (PO) and the FDTD method when the distance between the transmitting antenna and the measuring material is set in the Fresnel region. The analytical results are compared with the experimental results. When a conductive plate is utilized as measuring material, the spatial standing wave distributions analyzed by PO and FDTD method, the measured distributions correlate well in terms of their tendencies. From experiments carried out with several types of electromagnetic wave absorbers at 600 to 2000 MHz, it is found that the reflection coefficient of the material can be determined by the spatial standing wave at about 1 to 2.5 wavelengths in front of the material. © 2003 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 86(8): 40–49, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.10081
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