Omnidirectional slot antenna
First Claim
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1. An antenna apparatus including:
- a grounded conductive hollow body having a first radiation slot disposed in a wall of the grounded conductive hollow body, and a second radiation slot disposed in a wall opposite to the first radiation slot, each of the first and second radiation slots being aligned with a plane parallel to an axis of the grounded conductive hollow body; and
a signal feeding line, having a first branch coupled to said first radiation slot and a second branch coupled to said second radiation slot, the signal feeding line exciting the first radiation slot out of phase with respect to the second radiation slot to form an omnidirectional pattern outside and extending about the antenna apparatus in a plane transverse to the axis of said grounded conductive hollow body;
wherein said hollow body includes a rectangular waveguide having radiation slots formed on the center line of the H planes of said rectangular waveguide and a member for disturbing a distribution of an electromagnetic field in said rectangular waveguide.
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Abstract
There is provided a small-sized and simplified horizontally polarized antenna apparatus which forms an omnidirectional pattern in the horizontal plane. The radiation field in the horizontal plane becomes continuous and a horizontally polarized omnidirectional radiation pattern can be obtained in the horizontal plane by forming radiation slots at opposing positions on a grounded hollow body and exciting the slots out of phase.
46 Citations
28 Claims
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1. An antenna apparatus including:
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a grounded conductive hollow body having a first radiation slot disposed in a wall of the grounded conductive hollow body, and a second radiation slot disposed in a wall opposite to the first radiation slot, each of the first and second radiation slots being aligned with a plane parallel to an axis of the grounded conductive hollow body; and a signal feeding line, having a first branch coupled to said first radiation slot and a second branch coupled to said second radiation slot, the signal feeding line exciting the first radiation slot out of phase with respect to the second radiation slot to form an omnidirectional pattern outside and extending about the antenna apparatus in a plane transverse to the axis of said grounded conductive hollow body; wherein said hollow body includes a rectangular waveguide having radiation slots formed on the center line of the H planes of said rectangular waveguide and a member for disturbing a distribution of an electromagnetic field in said rectangular waveguide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An antenna apparatus comprising:
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an omnidirectional antenna that provides a omnidirectional beam; and a radome, surrounding the omnidirectional antenna the radome including a plurality of radiation elements that receive the omnidirectional beam and transmit the omnidirectional beam outside of the radome in an omnidirectional pattern, wherein the plurality of radiation elements includes a plurality of slots disposed on the surface of the radome. - View Dependent Claims (18)
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19. An antenna apparatus comprising:
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a waveguide having a first radiation slot and a second radiation slot, each disposed substantially parallel to a longitudinal axis of the waveguide; and a feeding line, receiving an input signal, the feeding line terminating at an edge of the first radiation slot, the feeding line exciting the first radiation slot and the second radiation slot at different phases with respect to one another; wherein the signal causes the waveguide to be excited in a waveguide mode that is different from direct excitation of the first and second radiation slots provided by the feeding line, the apparatus further comprising at least one pin positioned transverse with respect to an axis of the waveguide to suppress the waveguide mode. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification