??????? (Ferrite Material)

1
???????(Ferrite Material)

• 2005. 9.10
• ??chia ho

2
?????

• ??????????? (polycrystal) ?????? ( 1000 1400C
  ) ???? ??????????,?????????????
• ???????????? MHz ???,?????????????? MHz ????
• ??????????????????????????,??????????????
• ??? ?????????????
• ????? ????????????
• ?????? ?????????????

3
??? ( Permeability µ )
L
l
9
?i


10
2
4 ? N
A
?i ????? L ????? (H) N ???? l
???????????? (cm) A ?????? (cm )
2
4
????? (Effective permeability µe )
L
l
9
?e


10
?
2
4 ? N
A
l
-1
?
C1 ????? (cm )
A
?e ????? L ????? (H) N ???? l
???????????? (cm) A ?????? (cm )
2
5
?? (Incremental) ??? ( µ? ) ??? (Reversible) ???
(µrev )
?B
?B ?????? ( ?? gauss )
µ?
?H
?H ?????? ( Oe oersted )
????? ( µrev ) ????????????,?????????????????? B
?????,?? B 0 ?,????,?????? B ?????? ????????????
?????????,?????????? E ?? P ?????