Cellular antennas with improved front-to-back performance
First Claim
Patent Images
1. A cellular antenna, providing an azimuth beamwidth and having improved front-to-back performance, comprising:
- a plurality of vertically aligned dipole radiators in a single vertical column;
a reflective backwall positioned behind said dipole radiators and having a width inadequate to achieve said azimuth beamwidth;
sidewalls extending forward from said backwall to increase beam focus to achieve said azimuth beamwidth; and
a plurality of slot radiating elements formed in said sidewalls to re-radiate signals behind said antenna to partially cancel signals otherwise radiated behind said antenna.
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Abstract
A 90 degree azimuth beamwidth is achieved in a narrow cellular antenna, by inclusion of sidewalls. To improve front-to-back performance, slot radiating elements extending through the sidewalls re-radiate signals behind the antenna. Signals re-radiated from the slot elements are effective to partially cancel signals otherwise radiated behind the antenna as a result of diffraction. H-shaped slots are described for sidewall use and side-to-side slots are described for endwall use. Slots may be dielectrically loaded by contiguous portions of a radome.
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Citations
22 Claims
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1. A cellular antenna, providing an azimuth beamwidth and having improved front-to-back performance, comprising:
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a plurality of vertically aligned dipole radiators in a single vertical column; a reflective backwall positioned behind said dipole radiators and having a width inadequate to achieve said azimuth beamwidth; sidewalls extending forward from said backwall to increase beam focus to achieve said azimuth beamwidth; and a plurality of slot radiating elements formed in said sidewalls to re-radiate signals behind said antenna to partially cancel signals otherwise radiated behind said antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A cellular antenna, including a reflector with re-radiating slots to improve front-to-back performance, comprising:
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a plurality of radiators arrayed in a vertical column; said reflector cooperating with said radiators, said reflector including sidewall portions extending forward; and a plurality of slot radiating elements formed in said sidewalls to re-radiate signals behind said reflector to improve front-to-back performance by partially canceling signals otherwise radiated behind said antenna, said slot radiating elements proportioned to be non-resonant within an operating frequency band. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A cellular antenna, providing an azimuth beamwidth and having improved front-to-back performance, comprising:
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a plurality of vertically aligned dipole radiators in a single vertical column; a reflective backwall of planar rectangular shape positioned behind said dipole radiators and having a width inadequate to achieve said azimuth beamwidth; sidewalls of planar rectangular shape and extending forward from said backwall to increase beam focus to achieve said azimuth beamwidth; and a plurality of H-shaped slot radiating elements formed in said sidewalls to re-radiate signals behind said antenna to improve front-to-back performance by partially canceling signals otherwise radiated behind said antenna. - View Dependent Claims (20, 21, 22)
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Specification