Title :
Two-layer wave absorber composed of soft-magnetic and ferroelectric substances
Author :
Miyata, Yoshimori ; Matsumoto, Morihiko
Author_Institution :
NTT Tech. Assistance & Support Center, Tokyo, Japan
fDate :
9/1/1997 12:00:00 AM
Abstract :
The proposed electromagnetic-wave absorber is based on the fact that the high matching frequency of a carbonyl iron-loaded one-layer rubber wave absorber decreases as the thickness or permittivity of the ferroelectric substance layer in front of it increases. A proposed two-layer wave absorber with a 1.5-mm carbonyl iron-loaded rubber and 0.5-mm barium titanate system has a return loss of 29 dB at 0.9 GHz. The matching frequency can easily designed to any frequency in the quasi-microwave-band by controlling the thickness of ferroelectric substance layer. It is suitable for quasi-microwave-band application
Keywords :
S-parameters; electromagnetic wave absorption; electromagnetic wave propagation; ferroelectric devices; impedance matching; losses; magnetic microwave devices; permittivity; soft magnetic materials; 0.5 mm; 0.9 GHz; 1.5 mm; 29 dB; BaTiO3; S parameter; carbonyl iron-loaded one-layer rubber wave absorber; electromagnetic-wave absorber; ferroelectric layer permittivity; ferroelectric layer thickness control; ferroelectric substances; high matching frequency; matching frequency design; quasi-microwave-band; return loss; soft-magnetic layer; two-layer EM wave absorber; Barium; Ferroelectric materials; Frequency; Permeability; Permittivity; Propagation constant; Rubber; Soft magnetic materials; Surface impedance; Thickness control; Titanium compounds;
Journal_Title :
Magnetics, IEEE Transactions on
