Patch antenna with magnetically controllable radiation polarizat

Details Patch antenna with magnetically controllable radiation polarizat Patch antenna with magnetically controllable radiation polarizat

1994-07-29

1996-03-26

Hajec, Donald T.

Communications: radio wave antennas

Antennas

Microstrip

343787, 333 21A, H01Q 138

Patent

active

055024513

ABSTRACT:
A microstrip patch antenna with radiation polarization that can be magnetically varied via the application of the in-plane magnetic field. The antenna comprises a retangular metallic patch which is deposited on a ferrite film, which itself has been deposisted on a dielectric substrate. The patch is fed via an SMA connector which is grounded to the back of the substrate. The center pin of the connector passes through a hole drilled in the substrate. The patch radiates first and second perpendicular polarizations. The first polarization is broadband in frequency, and does not tune with an applied magnetic field. The second polarization is narrowband in frequency, and its center frequency increases as an in-plane bias field is applied. As bias is applied, the narrowband radiation tunes across the frequency bandwidth of the more broadband, perpendicularly polarized radiation. The phase relationship between the two polarizations is thus changed at frequencies at which power is radiated by both polarizations.

REFERENCES:
patent: 3653054 (1972-03-01), Wen
patent: 3811128 (1974-05-01), Munson
patent: 4660048 (1987-04-01), Doyle
patent: 4780724 (1988-10-01), Sharma et al.
patent: 4783661 (1988-11-01), Smith
patent: 4821041 (1989-04-01), Evans
patent: 4879562 (1989-11-01), Stern et al.
patent: 4985709 (1991-01-01), Nishikawa et al.
patent: 5229777 (1993-07-01), Doyle
patent: 5327148 (1994-07-01), How et al.

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