Absorber with optimized low frequency reflection

Details Absorber with optimized low frequency reflection Absorber with optimized low frequency reflection

1994-08-04

1996-02-20

Loney, Donald J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428141, 428148, 428212, 4284259, 364481, 364512, 181284, B32B 300, G06F 1560, E04B 182

Patent

active

054927498

ABSTRACT:
There is proposed the design of an absorber with the lowest reflection coefficient, especially between 30 and 150 Mhz where most of actual anechoic chambers exhibit problems. The absorber with optimized low frequency reflection comprises a a twisted pyramid having a length 11 and permittivity coefficients e1' and e1", a first layer adjacent the base of the pyramid having a width 12, and permittivity coefficients e2' and e2", and a second layer adjacent the first layer having a width 13, and permittivity coefficients e3' and e3", with 11 equal to 2.20 m (+/- 1 cm), 12 equal to 0.188 m (+/- 1 cm), 13 equal to 0.302 m (+/- 1 cm), and
e1'=10 E (-0.370 LogF+1.005)(+/- 10%)
e1"=-10 E (-0.484 LogF+1.012)(+/- 10%)
e2'=10 E (-0.353 LogF+1.317)(+/- 10%)
e2"=-10 E (-0.222 LogF+0.789)(+/- 10%)
e'=10 E (-0.316 LogF+1.785)(+/- 10%)
e"=-10 E (-0.598 LogF+2.347)(+/- 10%)
in the range 30-150 Mhz.

REFERENCES:
patent: 5016185 (1991-05-01), Kuester et al.
patent: 5234740 (1993-08-01), Reeves et al.

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