Multimode ultrahigh-frequency source and antenna

Details Multimode ultrahigh-frequency source and antenna Multimode ultrahigh-frequency source and antenna

1981-03-05

1982-11-02

Moore, David K.

Communications: radio wave antennas

Antennas

Wave guide type

343772, H01Q 1302

Patent

active

043576125

ABSTRACT:
A multimode ultrahigh-frequency source with wide passband comprises a rectangular waveguide with a cavity terminating at an exit aperture in a horizontally flared horn, an input end of the cavity remote from the horn being joined at a transverse discontinuity plane to an upper and a lower pair of symmetrically disposed rectangular supply guides that are vertically separated from each other. An obstruction in the form of a block located between the levels of the supply guides extends from the discontinuity plane forward into the cavity and converges toward the horn in the vertical E-plane, e.g. with a trapezoidal cross-section. With the supply guides excited in the basic TE.sub.10 mode, a suitable dimensioning of the block will maintain a cophasal relationship between this basic mode and a hybrid mode EM.sub.12, originating at the discontinuity plane, in the exit aperture of the cavity over a wide frequency band.

REFERENCES:
patent: 3308469 (1967-03-01), Drabowitch
patent: 3701163 (1972-10-01), Grabowski
patent: 3883877 (1975-05-01), Chabah et al.
patent: 4241353 (1980-12-01), Salvat et al.

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