Diversity antenna system
First Claim
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1. A method of radio communication in a predetermined frequency range having a predetermined mid-frequency, comprising the steps:
- providing a first pair of oppositely directed radiation reflective surfaces normal to the azimuth plane,providing a second pair of oppositely directed radiation reflective surfaces normal to the azimuth plane, directed in different directions to the first pair of radiation reflective surfaces,providing an antenna spaced away from each of the radiation reflective surfaces of the first pair and the second pair by a distance of less than one third of wavelength of electromagnetic radiation at said predetermined mid-frequency for producing a signal of reduced elevation beam width and increased gain of radiation emitted into the azimuth plane, andfeeding the first pair of antennas in combination and the second pair of antennas in combination to produce two radio signals with diversity action.
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Abstract
Plural antennas are located sufficiently closely to associated radiation reflective surfaces for consequential reduction of elevation beam-width and increase gain in azimuth. Two pairs of antennas associated with differently directed said radiation reflective surfaces afford diversity action. The antennas can be dipoles and the reflective surfaces can be faces of a housing box for related electronics.
18 Citations
26 Claims
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1. A method of radio communication in a predetermined frequency range having a predetermined mid-frequency, comprising the steps:
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providing a first pair of oppositely directed radiation reflective surfaces normal to the azimuth plane, providing a second pair of oppositely directed radiation reflective surfaces normal to the azimuth plane, directed in different directions to the first pair of radiation reflective surfaces, providing an antenna spaced away from each of the radiation reflective surfaces of the first pair and the second pair by a distance of less than one third of wavelength of electromagnetic radiation at said predetermined mid-frequency for producing a signal of reduced elevation beam width and increased gain of radiation emitted into the azimuth plane, and feeding the first pair of antennas in combination and the second pair of antennas in combination to produce two radio signals with diversity action. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A radio antenna apparatus for operating in a predetermined frequency range having a predetermined mid-frequency, comprising
a first pair of oppositely directed radiation reflective surfaces normal to the azimuth plane, a second pair of oppositely directed radiation reflective surfaces normal to the azimuth plane, the second pair of radiation reflective surfaces being directed in different directions to the first pair of radiation reflective surfaces, and first pair of antennas and second pair of antennas, the antennas spaced away from each of the radiation reflective surfaces of the first pair of radiation reflective surfaces and the second pair of radiation reflective surfaces by a distance of less than one third of wavelength of electromagnetic radiation at the predetermined mid-frequency, for reducing elevation beam width and increasing gain of radiation emitted into the azimuth plane; - wherein
the antennas of the first pair are fed in combination with one another, the antennas of the second pair are fed in combination with one another, and the antenna apparatus has diversity action. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
- wherein
Specification