부산대학교 도서관

In order to realize a coating-type millimeter wave absorber superior in weather resistance for outside use, the absorption characteristics at 50 to 110 GHz are studied for titanium dioxide and epoxy resin containing carbon particles. It is found that the frequency dependence of the complex relative permittivity of the material doped with 32 phr of titanium dioxide and 1 phr of carbon particles varies almost in parallel with the reflectionless curve and that both the real and imaginary parts tend to decrease as the frequency is increased. It is shown theoretically and experimentally that coating-type millimeter wave absorbers made to have absorption characteristics of more than 23 dB at the maximum can be obtained at an arbitrary frequency in the 50 to 110 GHz range by simply changing the thickness, and that the frequency range with an absorption of more than 20 dB exceeds 5 GHz. © 2003 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 86(5): 52–58, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.10017 [ABSTRACT FROM AUTHOR]