Helix antenna
First Claim
Patent Images
1. An antenna element comprising:
- a ground plane;
a cylindrical helix having a uniform pitch, the cylindrical helix being disposed above the ground plane, the cylindrical helix being connectable to a communications apparatus at a first helix end, said first helix end being located near the ground plane; and
a lateral spiral substantially centred on the axis of the cylindrical helix, the spiral having a first end thereof connected to a second helix end, said second helix end being the opposite end of the cylindrical helix to the first helix end, said lateral spiral thereby terminating the antenna element.
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Accused Products
Abstract
An antenna element is disclosed, having a ground plane (106), a helix (104) disposed above the ground plane (106), the helix (104) being connectable to a communications apparatus at a helix end (214) located near the ground plane (106), and a spiral (102) substantially centred on the axis (100) of the helix (104) the spiral (102) having an outer end thereof connected to the other helix end, said spiral (102) thereby terminating the antenna.
18 Citations
16 Claims
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1. An antenna element comprising:
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a ground plane;
a cylindrical helix having a uniform pitch, the cylindrical helix being disposed above the ground plane, the cylindrical helix being connectable to a communications apparatus at a first helix end, said first helix end being located near the ground plane; and
a lateral spiral substantially centred on the axis of the cylindrical helix, the spiral having a first end thereof connected to a second helix end, said second helix end being the opposite end of the cylindrical helix to the first helix end, said lateral spiral thereby terminating the antenna element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 15)
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10. An antenna comprising:
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a phased array feed network having an equipment feed-line for connection to communication apparatus and a plurality of element feed-lines for connection to a like plurality of cylindrical helix antenna elements, said phased array feed network being adapted to collectively connect said plurality of cylindrical helix antenna elements to the communication apparatus; and
said plurality of cylindrical helix antenna elements arranged in a domino pattern, each said cylindrical helix antenna element comprising a ground plane and a cylindrical helix having a uniform pitch disposed above the ground plane, each said cylindrical helix antenna element being individually connectable at a respective first cylindrical helix end located near the ground plane to a respective element feed-line of the phased array feed network to thereby connect said cylindrical helix antenna element to the communications apparatus, wherein each said cylindrical helix antenna element further comprises a lateral spiral substantially centred on the axis of the cylindrical helix the lateral spiral having a first end thereof connected to a second helix end being the opposite end of the cylindrical helix to the first helix end, said spiral thereby terminating the antenna.
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13. An antenna comprising:
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a ground plane;
a plurality of cylindrical helices disposed above the ground plane, each said cylindrical helix being connectable, via a respective feed line of an associated phased array feed network to a communications apparatus, at a respective first helix end located near the ground plane; and
a like plurality of lateral spirals, each substantially centred on the axis of the corresponding one of the plurality of cylindrical helices, said each lateral spiral having a first end thereof connected to a second helix end of the corresponding one of the plurality of helices, said second helix end being the opposite end of the cylindrical helix to the first helix end, said lateral spiral thereby terminating the corresponding helix.
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14. An antenna comprising:
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a ground plane;
a plurality of cylindrical helices disposed above the ground plane, each said cylindrical helix being connectable, via a respective feed line of an associated switched element feed network to a communications apparatus, at a respective first helix end located near the ground plane; and
a like plurality of lateral spirals, each substantially centred on the axis of the corresponding one of the plurality of cylindrical helices, said each lateral spiral having a first end thereof connected to a second helix end of the corresponding one of the plurality of cylindrical helices, said lateral spiral thereby terminating the corresponding helix.
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16. A method of impedance matching a cylindrical helix antenna element wherein the cylindrical helix antenna element comprises a ground plane, a cylindrical helix having a uniform pitch disposed above the ground plane, the cylindrical helix being connectable to a communications apparatus at a first helix end located near the ground plane, and a lateral spiral substantially centred on the axis of the cylindrical helix the lateral spiral having a first end thereof connected to a second helix end, said second helix end being the opposite end of the cylindrical helix to the first helix end, said lateral spiral thereby terminating the cylindrical helix antenna, said method comprising the steps of:
adjusting a distance, from the ground plane, of the first helix end located near the ground plane to thereby adjust the impedance of a tapered transmission line formed between the ground plane and a first quarter turn of the cylindrical helix.
Specification