High-gain, waveguide-fed antenna having controllable higher orde

Details High-gain, waveguide-fed antenna having controllable higher orde High-gain, waveguide-fed antenna having controllable higher orde

1993-03-16

1997-06-24

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Wave guide type

343783, 343785, H01Q 1302

Patent

active

056421214

ABSTRACT:
A diverging shall antenna fed by a waveguide supplying TE.sub.11 mode is described. A dielectric rod partially contained within the waveguide converts the TE.sub.11 mode to a dominant or HE.sub.11 mode. The HE.sub.11 mode is controllably converted to second and third order modes in the diverging shell by discontinuities placed in predetermined locations in the diverging shell. The discontinuities generating the second mode are incorporated into the dielectric rod structure. Turning of the relative amplitude and phase of the second and third order modes relative to the HE.sub.11 mode is achieved by slideably positioning the dielectric rod. An alternative embodiment of the inventive device includes a reactive surface of the diverging shell.

REFERENCES:
patent: 3324423 (1967-06-01), Webb
patent: 4468672 (1984-08-01), Dragone
patent: 4673947 (1987-06-01), Newham
patent: 4783665 (1988-11-01), Lier et al.
patent: 5109232 (1992-04-01), Monte
Johnson et al, Antenna Engineering Handbook, 3rd ed, 1993, pp. 42--42 to 42-45.

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