Individually packaged magnetically tunable resonators and method

Details Individually packaged magnetically tunable resonators and method Individually packaged magnetically tunable resonators and method

1978-05-05

1979-09-25

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333167, 333223, H01P 120, H01P 700

Patent

active

041692527

ABSTRACT:
A building block resonator is fabricated using a single chemically milled copper pattern and two pieces of garnet material to form a quarter-wave transmission line which is shorted at one end. Tuning is achieved with an electromagnet by varying the static magnetic field perpendicular to the resonator which causes the permeability of the garnet material to change. Resonators formed in this manner can be cascaded in any number to form a multi-pole filter. Narrow band UHF filters (0.5 percent 3 dB bandwidth at 225-400 megahertz) can be built in a very compact form. The magnetic tuning field intensities used are above the saturation point of the garnet, and high power level operation devoid of non-linear effects is possible.

REFERENCES:
patent: 3221276 (1965-11-01), Stern
patent: 3408599 (1968-10-01), Horton et al.
patent: 3448409 (1969-06-01), Moose et al.
patent: 3458837 (1969-07-01), Ngo
patent: 3539953 (1970-11-01), Jones
patent: 3671883 (1972-06-01), Szente et al.
patent: 3681716 (1972-08-01), Chiron et al.
patent: 3748605 (1973-07-01), Baynham et al.
patent: 3766494 (1973-10-01), Anbe et al.
patent: 4020429 (1977-04-01), Bickley

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