Adjustable beamwidth aviation antenna with directional and omni-directional radiation modes
First Claim
1. An antenna array, comprising:
- a conductive ground plane;
a plurality of monopoles, each comprising a generally symmetric, tapered or semi-elliptic radiating element mounted on and substantially perpendicular to the conductive ground plane;
a capacitive hat positioned adjacent to the plurality of monopoles;
an inductive shorting element extending from the capacitive hat to the conductive ground plane;
a plurality of variable length feed lines, the plurality of variable length feed lines being connected to the plurality of radiating elements,wherein each variable length feed line is operatively connected to an associated radiating element and the plurality of variable length feed lines are configured to supply uniformly phase-fed signals to the radiating elements for causing the antenna to provide an omni-directional beam when the antenna array is in an omni-directional mode; and
wherein the plurality of variable length feed lines is further configured to supply variably phase-fed signals to the radiating elements for causing the antenna to provide a directional beam when the antenna array is in a directional mode.
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Accused Products
Abstract
The present invention is an adjustable beamwidth, loaded monopole antenna array. The array may include four monopole antennas. Each of the antennas may include a generally symmetric, tapered radiating element and an inductive shorting wall element. The array may further include a capacitive top hat element which may be connected to each of the antennas. The array may further include a ground plane element which may be connected to each of the antennas. The array may further include a plurality of feed posts which may be connected to the antennas. Further, each feed post may be connected to a power feed line. Each radiating element may be variably phase-fed and/or uniformly phase-fed for allowing the antenna array to effect a directional beam and/or an omni-directional beam.
23 Citations
20 Claims
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1. An antenna array, comprising:
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a conductive ground plane; a plurality of monopoles, each comprising a generally symmetric, tapered or semi-elliptic radiating element mounted on and substantially perpendicular to the conductive ground plane; a capacitive hat positioned adjacent to the plurality of monopoles; an inductive shorting element extending from the capacitive hat to the conductive ground plane; a plurality of variable length feed lines, the plurality of variable length feed lines being connected to the plurality of radiating elements, wherein each variable length feed line is operatively connected to an associated radiating element and the plurality of variable length feed lines are configured to supply uniformly phase-fed signals to the radiating elements for causing the antenna to provide an omni-directional beam when the antenna array is in an omni-directional mode; and wherein the plurality of variable length feed lines is further configured to supply variably phase-fed signals to the radiating elements for causing the antenna to provide a directional beam when the antenna array is in a directional mode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An adjustable beamwidth, loaded monopole antenna array, comprising:
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four monopole antennas, each comprising a generally symmetric, tapered radiating element; an inductive shorting element; a capacitive hat; a ground plane element configured for being connected to the four monopole antennas; a plurality of feed posts, the plurality of feed posts configured being connected to the four monopole antennas; and a plurality of variable length power feed lines, the feed posts being configured for connecting to the plurality of variable length power feed lines, wherein each monopole antenna is mounted on and substantially perpendicular to the ground plane element and the of radiating elements are configured for being uniformly phase-fed when the antenna array is in an omni-directional mode for causing the antenna array to provide an omni-directional beam; and
variably phase-fed via the variable length power feed lines when the antenna array is in a directional mode for causing the antenna array to provide a directional beam. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system, comprising:
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an adjustable beamwidth, loaded monopole antenna array, including; four monopole antennas, each comprising a generally symmetric, tapered radiating, element; at least one inductive shorting element; a capacitive hat; a ground plane element configured for being connected to each of the four monopole antennas; a plurality of feed posts, the plurality of feed posts configured for being connected to the four monopole antennas; a plurality of variable length power feed lines, the plurality of variable length power feed lines being connected to the plurality of feed posts wherein the plurality of radiating elements of the four monopole antennas is configured for being uniformly phase-fed when the antenna array is in an omni-directional mode for causing the antenna array to provide an omni-directional beam; and
variably phase-fed via the variable length power feed lines when the antenna array is in a directional mode for causing the antenna array to provide a directional beam;wherein each monopole antenna is mounted on and substantially perpendicular to the ground plane; and a processor, the processor configured for being connected to and communicatively coupled with the monopole antenna array, the processor being at least one of a Traffic Alert and Collision Avoidance System (TCAS) processor and a Configurable Integrated Surveillance System (CISS) processor, wherein the monopole antenna array is at least one of a TCAS monopole antenna array and a CISS monopole antenna array. - View Dependent Claims (19, 20)
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Specification