Rotation-independent helical antenna
First Claim
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1. A helical antenna having a central axis defined between a base end and a distal end, the helical antenna comprising:
- A. an elongated dielectric core formed about the central axis between the base end and the distal end; and
B. a helical coil coaxial with and wound about the core, the helical coil comprising;
1) a feed line formed at the base end and along the central axis;
2) an axially tapered end formed at the distal end, the tapered end decreasing in radius along the central axis and in the direction of the distal end; and
3) a midsection disposed between the feed line and tapered end, the midsection having a taper angle smaller than a taper angle of the tapered end relative to the central axis and in the direction of the distal end.
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Abstract
A helical antenna having a central axis defined between a base end and a distal end comprises a helical conductor wound about the central axis and having a feed line disposed at the base end and along the central axis, and may also include an elongated dielectric core about which the electrical conductor is wound.
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Citations
18 Claims
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1. A helical antenna having a central axis defined between a base end and a distal end, the helical antenna comprising:
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A. an elongated dielectric core formed about the central axis between the base end and the distal end; and B. a helical coil coaxial with and wound about the core, the helical coil comprising; 1) a feed line formed at the base end and along the central axis; 2) an axially tapered end formed at the distal end, the tapered end decreasing in radius along the central axis and in the direction of the distal end; and 3) a midsection disposed between the feed line and tapered end, the midsection having a taper angle smaller than a taper angle of the tapered end relative to the central axis and in the direction of the distal end. - View Dependent Claims (2, 3, 4, 5)
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6. A method of making a helical antenna comprising the steps of:
A. winding an elongated electrical conductor about a central axis, the electrical conductor having a base end and a distal end, including; 1) forming an axially tapered end by tapering the conductor in decreasing radius along the central axis and in the direction of the distal end; 2) forming a feed line at the base end along the central axis; and 3) forming a midsection disposed between the feed line and the tapered end, the midsection having a taper angle smaller than a taper angle of the tapered end relative to the central axis and in the direction of the distal end. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method of adjusting a phase of a helical antenna, the helical antenna comprising an elongated helical coil having a central axis disposed between a base end and a distal end and a feed line disposed at the base end, the method comprising the steps of:
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A. rotatably mounting the base end of the helical antenna to a substrate such that the helical antenna is substantially oriented for at least one of radiation or reception in the direction of the central axis; B. disposing the feed line along the central axis and providing a transmission path comprising a coupling junction disposed at the central axis; C. coupling the feed line to the coupling junction; and D. rotating the helical antenna about the central axis until a desired phase is achieved, without decoupling the feed line from the coupling junction. - View Dependent Claims (13, 14)
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15. A helical antenna having a central axis defined between a base end and a distal end, the helical antenna comprising:
A. a helical coil coaxial with and wound about the central axis, the helical coil comprising; 1) a feed line formed at the base end and along the central axis; 2) an axially tapered end formed at the distal end, the tapered end decreasing in radius along the central axis and in the direction of the distal end; and 3) a midsection disposed between the feed line and tapered end, the midsection having a taper angle smaller than a taper angle of the tapered end relative to the central axis and in the direction of the distal end. - View Dependent Claims (16, 17, 18)
Specification