Hybrid type wide band electromagnetic wave absorber

Details Hybrid type wide band electromagnetic wave absorber Hybrid type wide band electromagnetic wave absorber

1995-10-18

1997-04-01

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Radio wave absorber

342 4, H01Q 1700

Patent

active

056170955

ABSTRACT:
A hybrid-type wide band electromagnetic wave absorber having cone-shaped projections of a reduced may be produced by matching the impedance of the cone-shaped absorber members and the underlying plate type absorber. Such a hybrid-type wide band electromagnetic wave absorber is formed by arranging tapered cone-shaped members in a regular pattern on a sintered ferrite plate, which is disposed on a metal plate. The cone-shaped members are formed of a material selected from a ferrite and a ferrite composite and each have a normalized cross-sectional area at the base of 0<S.sub.0 <1 and an exponent of cone shape of 0<n<10. Such a hybrid type electromagnetic wave absorber may be used, for example, for performing EMI/EMS testing in an anechoic chamber in the frequency range of 30 MHz to 1 GHz. In the case of applications such as antenna testing in the frequency range of 30 MHz to 30 GHz, the height of the cone-shaped members must be appropriately increased.

REFERENCES:
patent: 3754255 (1973-08-01), Suetake et al.
patent: 4023174 (1977-05-01), Wright
patent: 5453745 (1995-09-01), Kudo et al.

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