HYBRID HOLLOW RADIOWAVE ABSORBER, RADIOWAVE ABSORPTION WALL USING THE SAME, AND ANECHOIC CHAMBER

摘要

PROBLEM TO BE SOLVED: To provide: a hollow radiowave absorber constituting a radiowave absorption wall capable of securing a return loss of about -20 dB in a wide frequency band substantially from 30 MHz to 3 GHz; a radiowave absorption wall using the hybrid hollow radiowave absorber; and an anechoic chamber.;SOLUTION: A hybrid hollow radiowave absorber 1 includes a hollow radiowave absorber and a ferrite tile 3, wherein the hollow radiowave absorber is provided by forming a conductive sheet 2 in a wedge shape or pyramid shape having a hollow. The hybrid hollow radiowave absorber includes a dielectric loss body 4 in a hollow thereof. The dielectric loss body 4 has a complex dielectric constant with an imaginary part ε" in a range of 0.1 to 2.0, has a thickness equal to or more than 1/12 of a wavelength at a frequency that is the higher one of frequencies at which a return loss of a radio radiowave is -20 dB on both sides of a resonance point of the ferrite tile 3, and is arranged apart from a commissure between the ferrite tile 3 and the radiowave absorber with a distance equal to or more than 1/6 of the wavelength, wherein the thickness d is equal to or less than a difference between the entire length and the distance of the hollow radiowave absorber, and the distance is equal to or less than a difference between the entire length and thickness of the hollow radiowave absorber.;COPYRIGHT: (C)2011,JPO&INPIT