Tunable millimeter wave filter using ferromagnetic metal films

Details Tunable millimeter wave filter using ferromagnetic metal films Tunable millimeter wave filter using ferromagnetic metal films

1994-04-04

1996-10-22

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333205, 333202, H01P 120

Patent

active

055681069

ABSTRACT:
The present invention discloses a frequency tunable filter which includes an electromagnetic (E-M) wave propagation line which includes a microstrip and a ground plane in the substrate for transmitting a sequence of E-M signals via the propagation line. The E-M wave propagation line includes a frequency tuning mechanism, i.e., the magnetic layer, which is capable of utilizing a ferromagnetic anti-resonance frequency response to the E-M signals transmitted via the propagation line for controlling and frequency tuning the E-M signal transmission. In one of the preferred embodiments, the E-M wave propagation line includes a microstrip forming on the top surface of a dielectric or semiconductor substrate for receiving and transmitting the E-M signals and a ground plane forming on the bottom surface of the semiconductor substrate. And, the frequency tuning mechanism includes a ferromagnetic layer formed in the substrate between the microstrip and the ground plane.

REFERENCES:
patent: H432 (1988-02-01), Mariani et al.
patent: 3748605 (1973-07-01), Baynham
patent: 4169252 (1979-09-01), Moszkiewicz
patent: 4191308 (1980-03-01), Tsutsumi et al.
patent: 4197517 (1980-04-01), Vittoria
patent: 4636756 (1987-01-01), Ito et al.
patent: 4853660 (1989-08-01), Schloemann
patent: 4992760 (1991-02-01), Takeda et al.

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