RF choke with a low Q core formed by sintering ferrous and ferri

Details RF choke with a low Q core formed by sintering ferrous and ferri RF choke with a low Q core formed by sintering ferrous and ferri

1996-02-05

1998-11-17

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

252 6256, 336233, H01F 2724

Patent

active

058382151

ABSTRACT:
A radio frequency (RF) choke inductor (102, 500, 600) includes a magnetic core (502, 602) which substantially dissipates RF and microwave signals. The magnetic core (502, 602) is sufficiently lossy to provide a substantially resistive impedance at RF and microwave frequencies. The magnetic core is formed by providing a homogeneous ferrite composition characterized by a mixture of ferrous ions and ferric ions (404), and then sintering the homogeneous ferrite composition in an inert gas atmosphere (412) to provide a rapid electron exchange reaction. A conductive wire is then wound about the magnetic core (414) to complete the choke inductor.

REFERENCES:
patent: 2561495 (1951-07-01), Harvey
patent: 2766211 (1956-10-01), Miller
patent: 3055832 (1962-09-01), Weisz
patent: 3638147 (1972-01-01), Denes
patent: 3781740 (1973-12-01), Kirmis et al.
patent: 3982814 (1976-09-01), Kaiserwerth et al.
Krauss et al., Solid State Radio Engineering, 1980, pp. 3,103,126, and 221.

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