Title :
Millimeter wave absorber using M-type hexagonal ferrite
Author :
Iijima, Yasushi ; Houjou, Yuji ; Sato, Risaburo
Author_Institution :
Electromagnetic Compatibility Res. Labs. Co. Ltd., Sendai, Japan
Abstract :
Millimeter wave absorption properties of M-type hexagonal ferrite SrFe12-xAlxO19 composites have been investigated. The complex permittivity and permeability of the materials were measured by a free space method. When ferric ion was partially substituted by aluminum ion, the ferromagnetic resonance frequency moved up from 52 GHz to 83 GHz, corresponding to the increase of substitution amount: x=0 to 2. The result of material constant measurement was applied to the design of the impedance matched wave absorbers, and it was found that thin sheet absorbers for the V-band are possible using M-type hexagonal ferrite composites
Keywords :
composite materials; electromagnetic wave absorption; ferrites; ferromagnetic resonance; impedance matching; permeability; permittivity measurement; polymers; 52 GHz; 83 GHz; M-type hexagonal ferrite composites; V-band; aluminum ion; complex permeability; complex permittivity; ferric ion; ferromagnetic resonance frequency; free space method; impedance matched wave absorbers; material constant measurement; millimeter wave absorber; millimeter wave absorption properties; resin; substitution amount; thin sheet absorbers; Absorption; Aluminum; Extraterrestrial measurements; Ferrites; Magnetic resonance; Millimeter wave measurements; Millimeter wave technology; Permeability measurement; Permittivity measurement; Resonant frequency;
Conference_Titel :
Electromagnetic Compatibility, 2000. IEEE International Symposium on
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-5677-2
DOI :
10.1109/ISEMC.2000.874679
