Helical antenna apparatus and methods
Example apparatuses and methods relating to antennas are provided. An example apparatus in the form of an antenna assembly includes a first conductor structurally formed into a plurality of first conductor structural waves and a second conductor structurally formed into a plurality of second conductor structural waves. The first conductor and second conductor may be helically wound to form a bifilar helix structure having a proximal end and a distal end. The first conductor and the second conductor may be operatively coupled at the proximal end of the bifilar helix structure to form a signal feed point, and the first conductor and the second conductor are operatively coupled at the distal end of the bifilar helix structure to form a load point.
1. An antenna assembly comprising:
a first conductor structurally formed into a plurality of first conductor structural waves; and
a second conductor structurally formed into a plurality of second conductor structural waves,
wherein the first conductor and second conductor are helically wound to form a bifilar helix structure having a proximal end and a distal end, and
wherein the first conductor and the second conductor are operatively coupled at the proximal end of the bifilar helix structure to form a signal feed point, and the first conductor and the second conductor are operatively coupled at the distal end of the bifilar helix structure to form a load point.
2. The antenna assembly of claim 1 , wherein a first period of at least one of the first conductor structural waves disposed adjacent to the proximal end of the bifilar helix structure is greater in length than a second period of at least one of the first conductor structural waves disposed adjacent to the distal end of the bifilar helix structure.
3. The antenna assembly of claim 2 , wherein a third period of at least one of the second conductor structural waves disposed adjacent to the proximal end of the bifilar helix structure is greater in length than a fourth period of at least one of the second conductor structural waves disposed adjacent to the distal end of the bifilar helix structure.
4. The antenna assembly of claim 1 , wherein a period of each sequential first conductor structural wave decreases from the proximal end of the bifilar helix structure to the distal end of the bifilar helix structure.
5. The antenna assembly of claim 1 , wherein the antenna assembly further comprises a resistive load operably coupled to the load point to match a source impedance.
6. The antenna assembly of claim 1 , wherein the antenna assembly defines a given antenna length from the proximal end to the distal end; and wherein an operating frequency of the antenna assembly is a function of a amplitude of each first conductor structural wave for the given antenna length.
7. The antenna assembly of claim 1 , wherein an operating frequency band for the antenna assembly is a function of a period of each first conductor structural wave.
8. The antenna assembly of claim 1 , wherein a first amplitude of at least one of the first conductor structural waves disposed adjacent to the proximal end of the bifilar helix structure is greater than a second amplitude of at least one of the first conductor structural waves disposed adjacent to the distal end of the bifilar helix structure.
9. The antenna assembly of claim 1 , wherein an amplitude of each sequential first conductor structural wave decreases from the proximal end of the bifilar helix structure to the distal end of the bifilar helix structure.
10. The antenna assembly of claim 1 , wherein the antenna assembly is configured to operate in the absence of an operable coupling to a ground plane; and
wherein a diameter of the bifilar helix structure is less than one-quarter of the wavelength of an operating frequency for the antenna assembly.
11. A communications device comprising:
a transceiver; and
an antenna, the antenna being operably coupled to the transceiver, the antenna comprising:
a first conductor structurally formed into a plurality of first conductor structural waves; and
a second conductor structurally formed into a plurality of second structural conductor waves,
wherein the first conductor and second conductor are helically wound to form a bifilar helix structure having a proximal end and a distal end, and
wherein the first conductor and the second conductor are operatively coupled at the proximal end of the bifilar helix structure to form a signal feed point, and the first conductor and the second conductor are operatively coupled at the distal end of the bifilar helix structure to form a load point.
12. The communications device of claim 11 , wherein a first period of at least one of the first conductor structural waves disposed adjacent to the proximal end of the bifilar helix structure is greater in length than a second period of at least one of the first conductor structural waves disposed adjacent to the distal end of the bifilar helix structure.
13. The communications device of claim 12 , wherein a third period of at least one of the second conductor structural waves disposed adjacent to the proximal end of the bifilar helix structure is greater in length than a fourth period of at least one of the second conductor structural waves disposed adjacent to the distal end of the bifilar helix structure.
14. The communications device of claim 11 , wherein the antenna defines a given antenna length from the proximal end to the distal end; and wherein an operating frequency of the antenna assembly is a function of a amplitude of each first conductor structural wave for the given antenna length.
15. The communications device of claim 11 , wherein an operating frequency band for the antenna is a function of a period of each first conductor structural wave.
16. The communications device of claim 11 , wherein a first amplitude of at least one of the first conductor structural waves disposed adjacent to the proximal end of the bifilar helix structure is greater than a second amplitude of at least one of the first conductor structural waves disposed adjacent to the distal end of the bifilar helix structure.
17. The communications device of claim 11 , wherein an amplitude of each sequential first conductor structural wave decreases from the proximal end of the bifilar helix structure to the distal end of the bifilar helix structure.
18. The communications device of claim 11 , wherein the antenna is configured to operate in the absence of an operable coupling to a ground plane; and
wherein a diameter of the bifilar helix structure is less than one-quarter of the wavelength of an operating frequency for the antenna.
19. A method for providing an antenna assembly comprising:
structurally forming a plurality of first conductor structural waves in a first conductor;
structurally forming a plurality of second conductor structural waves in a second conductor; and
helically winding the first conductor and the second conductor to form a bifilar helix structure;
wherein the bifilar helix structure has a proximal end and a distal end; and
wherein the first conductor and the second conductor are operatively coupled at the proximal end of the bifilar helix structure to form a signal feed point, and the first conductor and the second conductor are operatively coupled at the distal end of the bifilar helix structure to form a load point.
20. The method of claim 19 , wherein the structurally forming the plurality of first conductor structural waves includes structurally forming the first conductor structural waves such that a period and amplitude of each sequential first conductor structural wave decreases from the proximal end of the bifilar helix structure to the distal end of the bifilar helix structure.