Dual frequency band directional antenna system

Details Dual frequency band directional antenna system Dual frequency band directional antenna system

1978-08-18

1980-01-08

Moore, David K.

Communications: radio wave antennas

Antennas

Plural separate diverse type

343789, H01Q 300

Patent

active

041830270

ABSTRACT:
A dual frequency band directional antenna or system in the form of a cavity reflector antenna mechanically combined and radiation-coupled with a loop of approximately the same shape and periphery as the rim edge of the cavity reflector, which loop is arranged outside and in front of, and in close proximity and parallel to the cavity rim edge, and, when properly energized, acts for the lower frequency band as a loop radiator with preselected field polarization, whereby the entire cavity structure serves two purposes by acting simultaneously as reflector for the higher frequency band cavity reflector antenna and for the lower frequency band, electrically separate loop radiator, with the radiation patterns of both sources being unidirectional over both frequency bands and with their radiation maxima directed into the center axis normal to the bottom plate of the cavity reflector structure.

REFERENCES:
patent: 3438043 (1969-04-01), Ehrenspeck
patent: 3508278 (1970-01-01), Ehrenspeck
patent: 3605104 (1971-09-01), Weston et al.
patent: 3742513 (1973-06-01), Ehrenspeck
Termon's Electronic and Radio Engineering, 4th Edition, McGraw Hill, 1955, pp. 907 and 908.

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