Richard B Stern

US Patent:

45381232, Aug 27, 1985

Filed:

Jan 20, 1984

Appl. No.:

6/572350

Inventors:

Elio A. Mariani - Hamilton Square NJ
Richard A. Stern - Allenwood NJ
Richard W. Babbitt - Fair Haven NJ

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

H01P 120
H01P 316
H01P 1213

US Classification:

333208

Abstract:

A millimeter wavelength bandpass filter arrangement is produced by using a first dielectric waveguide as an input for a broadband signal to a ferrite circulator. This signal is delivered to a second dielectric waveguide having a bandstop filter formed therein. The bandstop filter reflects the desired bandpass frequency(s) back to the ferrite circulator where it is delivered to a third dielectric waveguide which is the output for the bandpass frequency(s).

US Patent:

H4324, Feb 2, 1988

Filed:

Aug 7, 1985

Appl. No.:

6/763161

Inventors:

Elio A. Mariani - Hamilton Square NJ
Richard A. Stern - Allenwood NJ

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

H01P 1203

US Classification:

333205

Abstract:

A tunable bandpass filter comprising a pair of slot line resonant cavities formed in a metallic film covering the planar surface of a ferrite substrate. A magnetic biasing field of variable magnitude is generated and applied through the ferrite substrate transversely across the slot line resonant cavities. The magnetic field operates to change the electrical length of the resonant cavities due to the fact that the magnetic permeability of the ferrite material changes with the applied field.