Absorbing
microwave ferrite materials
Absorption of microwave energy by ferrite is based on harnessing the natural
ferromagnetic resonance of this material.
There types of ferrite powder were developed to be used as fillers dispersed in resins,
rubbers, and paints featuring microwave energy absorption capability.
Operation frequency of these materials depends on grain size and properties of ferrite
powders used in their fabrication. Relatively thin tiles and other covering media can be
formed combining layers of all three types of materials resulting in different electric
conductivity of absorbing body.
Type of absorber |
Absorbing material base |
Operating frequency bandwidth
GHz |
Degree of electric conductivity |
PM |
Mn-Zn
ferrite powders |
1- 5 |
high |
PG |
Mg
ferrite powders |
1-20 |
poor |
PH |
Hexaferrite
powders |
1-40 |
poor |
CH |
Hexaferrite,
ceramic version |
1-40 |
medium |
Contents
Forms and dimensions
STANDARD FORM AND DIMENSIONS OF MICROWAVE FERRITE PARTS
Ferrite parts can be delivered both as fired or machined articles.
Shapes
Parts as fired, dimensions (mm)
Contents
| |
Disks |
Plates
(square, rectangle, triangle) |
Round and square
cross-section rods |
Rings |
D |
10…120 |
|
5…40 |
5…100 |
L |
|
15…120 |
20…120 |
|
B |
|
5…60 |
5…30 |
|
H |
|
< 90 |
|
|
h |
3…10 |
3…10 |
5…15 |
2.5…15 |
d |
|
|
|
2…70 |
Standard tolerances: ± (3…4)%
Machined parts are to be delivered in accordance with the
Customer’s drawings.
Standard tolerances: ±0.02 mm
Standard finish: Ra =0.6 mm
Contents
Symbols
| 4pMs |
Saturation magnetization |
Gauss |
| DH |
FMR linewidth |
Oe |
| e' |
Dielectric constant |
|
| tgde
|
Dielectric loss tangent |
|
| geff |
Lande factor |
|
| Tc |
Curie temperature |
oC |
| DHk |
Spin wave linewidth |
Oe |
| Hc |
Coercive force |
Oe |
| Br |
Remanent flux density |
Gauss |
| HAeff |
Effective anizotropy field |
Oe |
| r |
Density |
g/cm3 |
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