Dual frequency band directional antenna system
First Claim
1. A dual frequency band directional antenna system comprising a cavity reflector antenna having a cavity, said cavity reflector antenna having predetermined outer dimensions, first feed means for said cavity reflector antenna, a loop forming an antenna having approximately the same outer dimensions as the cavity reflector antenna and being arranged outside and in front of said cavity reflector antenna at a predetermined distance therefrom, said cavity acting simultaneously as a reflector for said cavity reflector antenna and said loop, and second feed means for said loop such that said dual frequency antenna system is capable of receiving and transmitting two distinct frequency ranges.
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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.
96 Citations
17 Claims
- 1. A dual frequency band directional antenna system comprising a cavity reflector antenna having a cavity, said cavity reflector antenna having predetermined outer dimensions, first feed means for said cavity reflector antenna, a loop forming an antenna having approximately the same outer dimensions as the cavity reflector antenna and being arranged outside and in front of said cavity reflector antenna at a predetermined distance therefrom, said cavity acting simultaneously as a reflector for said cavity reflector antenna and said loop, and second feed means for said loop such that said dual frequency antenna system is capable of receiving and transmitting two distinct frequency ranges.
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11. A dual frequency band, directional antenna comprising
a cavity reflector antenna comprising a reflector a rim connected with said reflector to form a cavity and a feed means for said cavity reflector antenna; - and
a loop radiator having a separate feed means, said radiator being spaced from the rim of said cavity reflector antenna and of substantially the same perimeter such that said cavity acts, simultaneously, as a reflector for said cavity reflector antenna and said loop radiator for transmission or reception at two distinct frequency ranges. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification