Title :
A low-frequency model for wedge or pyramid absorber arrays-II: computed and measured results
Author :
Holloway, Christopher L. ; Kuester, Edward F.
Author_Institution :
Inst. for Telecommun. Sci., US Dept. of Commerce, Boulder, CO, USA
fDate :
11/1/1994 12:00:00 AM
Abstract :
Based on the theoretical model developed in Part I of this two-part paper, we present numerical results for the plane-wave reflection coefficient from arrays of pyramid-cone absorbers when the period of the array is smaller than half a wavelength. Comparison is made with results of a moment-method calculation, as well as with experimental measurements. The model is then used to modify the design of some existing types of commercially available absorbers for reduced reflection in the frequency range of 30-300 MHz. These improved absorbers have been installed in an anechoic chamber used for electromagnetic compatibility and electromagnetic interference (EMC/EMI) measurements. Site attenuation measurements from this chamber are presented which show closer correspondence to an ideal open-field test site
Keywords :
HF radio propagation; UHF radio propagation; VHF radio propagation; anechoic chambers; electromagnetic compatibility; electromagnetic interference; electromagnetic wave absorption; electromagnetic wave reflection; 30 to 300 MHz; HF; UHF; VHF; anechoic chamber; electromagnetic compatibility; electromagnetic interference; experimental measurements; frequency range; low-frequency model; measured results; moment-method calculation; open-field test site; period; plane-wave reflection coefficient; pyramid absorber arrays; pyramid-cone absorbers; site attenuation measurements; wavelength; wedge absorber arrays; Anechoic chambers; Attenuation measurement; Electromagnetic compatibility; Electromagnetic compatibility and interference; Electromagnetic interference; Electromagnetic measurements; Electromagnetic reflection; Frequency; Testing; Wavelength measurement;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
