Single-sided multi-band antenna

• US 8,654,021 B2
• Filed: 02/22/2012
• Issued: 02/18/2014
• Est. Priority Date: 09/02/2011
• Status: Active Grant

• Current Assignee: DockOn AG
• Original Assignee: DockOn AG
• Inventors: Brown, Forrest James, Orsi, Ryan James, Foster, Matthew Robert
• Primary Examiner(s): Nguyen, Hoang V
• Application Number:
  US13/402,777
• Publication Number:
  US 20130057440A1
• Time in Patent Office: 727 Days
• Field of Search: 343/726, 343/728, 343/741, 343/745, 343/748, 343/866
• US Class Current: 343/748
• CPC Class Codes: H01Q 1/48 Earthing means; Earth screens; Counterpoises
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 25/001 Crossed polarisation dual antennas orthomode horns H01Q13/0258; cross-polarised rear feeds H01Q19/136; orthomode transducers H01P1/161
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 7/005 with variable reactance for tuning the antenna
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence

Abstract

Embodiments provide multi-band, compound loop antennas (multi-band antennas). Embodiments of the multi-band antennas produce signals at two or more frequency bands, with the two or more frequency bands capable of being adjusted and tuned independently of each other. Embodiments of a multi-band antenna are comprised of at least one electric field radiator and at least one monopole formed out of the magnetic loop. At a particular frequency, the at least one electric field radiator in combination with various portions of the magnetic loop resonate and radiate an electric field at a first frequency band. At yet another particular frequency, the at least one monopole in combination with various portions of the magnetic loop resonate and radiate an electric field at a second frequency band. The shape of the magnetic loop can be tuned to increase the radiation efficiency at particular frequency bands and enable the multi-band operation of antenna embodiments.

Claims

1. A single-sided multi-band antenna, comprising:

a magnetic loop located on a plane and configured to generate a magnetic field, the magnetic loop including at least a first section and a second section, wherein the magnetic loop has a first inductive reactance adding to a total inductive reactance of the multi-band antenna;

a monopole formed by a substantially stair-shaped bend of the magnetic loop, the monopole configured to create a resonant mode of a first frequency band; and

an electric field radiator located on the plane and within the magnetic loop, the electric field radiator coupled to the magnetic loop and configured to emit an electric field at a second frequency band orthogonal to the magnetic field, wherein the electric field radiator has a first capacitive reactance adding to a total capacitive reactance of the multi-band antenna, wherein a physical arrangement between the electric field radiator and the magnetic loop results in a second capacitive reactance adding to the total capacitive reactance, and wherein the total inductive reactance substantially matches the total capacitive reactance.

2. The antenna as recited in claim 1, further comprising a second monopole positioned substantially opposite the monopole, the second monopole formed by a second substantially stair-shaped bend of the magnetic loop, wherein the monopole and the second monopole form a dipole and wherein the second monopole is a counterpoise to the monopole.

3. The antenna as recited in claim 1, further comprising a second electric field radiator located on the plane and within the magnetic loop, the second electric field radiator coupled to the magnetic loop and configured to emit a third electric field at a third frequency band orthogonal to the magnetic field, wherein the third electric field radiator has a third capacitive reactance adding to the total capacitive reactance, and wherein a physical arrangement between the second electric field radiator and the magnetic loop results in a fourth capacitive reactance adding to the total capacitive reactance.

4. The antenna as recited in claim 1, wherein the electric field radiator is substantially rectangular shaped, and wherein a corner of the electric field radiator is cut at an angle to reduce a capacitive coupling between the electric field radiator and the magnetic loop.

5. The antenna as recited in claim 1, wherein the first frequency band and the second frequency band are not harmonically related.

6. The antenna as recited in claim 1, wherein a portion of the magnetic loop adjacent to the monopole is capacitively loaded to bring the monopole into resonance.

7. The antenna as recited in claim 1, further comprising an electrical trace coupling the electric field radiator to the magnetic loop.

8. The antenna as recited in claim 7, wherein the electrical trace couples the electric field radiator to the magnetic loop at an electrical degree location approximately 90 degrees or approximately 270 degrees from a drive point of the magnetic loop.

9. The antenna as recited in claim 7, wherein the electrical trace couples the electric field radiator to the magnetic loop at a reflective minimum point where a current flowing through the magnetic loop is at a reflective minimum.

10. The antenna as recited in claim 7, wherein the electrical trace is configured to electrically lengthen the electric field radiator.

11. The antenna as recited in claim 1, wherein the electric field radiator is directly coupled to the magnetic loop at an electrical degree location approximately 90 degrees or approximately 270 degrees from a drive point of the magnetic loop.

12. The antenna as recited in claim 1, wherein the electric field radiator is directly coupled to the magnetic loop at a reflective minimum point where a current flowing through the magnetic loop is at a reflective minimum.

13. A single-sided multi-band antenna, comprising:

a magnetic loop located on a plane and configured to generate a magnetic field, a section of the magnetic loop including a substantially rectangular brick, the section configured to create a resonant mode of a first frequency band, wherein the magnetic loop has a first inductive reactance adding to a total inductive reactance of the multi-band antenna;

an electric field radiator located on the plane and within the magnetic loop, the electric field radiator coupled to the magnetic loop and configured to emit an electric field at a second frequency band and orthogonal to the magnetic field, wherein the electric field radiator has a first capacitive reactance adding to a total capacitive reactance of the multi-band antenna, wherein a physical arrangement between the electric field radiator and the magnetic loop results in a second capacitive reactance adding to the total capacitive reactance, and wherein the total inductive reactance substantially matches the total capacitive reactance; and

a substantially curve shaped trace coupled to the electric field radiator and extending from the electric field radiator, the trace configured to electrically lengthen the electric field radiator.

14. The antenna as recited in claim 13, wherein the brick is positioned within the magnetic loop.

15. The antenna as recited in claim 13, wherein the brick is positioned outside of the magnetic loop.

16. The antenna as recited in claim 13, wherein the first frequency band and the second frequency band are not harmonically related.

17. The antenna as recited in claim 13, further comprising an electrical trace coupling the electric field radiator to the magnetic loop.

18. The antenna as recited in claim 17, wherein the electrical trace couples the electric field radiator to the magnetic loop at an electrical degree location approximately 90 degrees or approximately 270 degrees from a drive point of the magnetic loop.

19. The antenna as recited in claim 17, wherein the electrical trace couples the electric field radiator to the magnetic loop at a reflective minimum point where a current flowing through the magnetic loop is at a reflective minimum.

20. The antenna as recited in claim 13, wherein the electric field radiator is directly coupled to the magnetic loop at an electrical degree location approximately 90 degrees or approximately 270 degrees from a drive point of the magnetic loop.

21. The antenna as recited in claim 13, wherein the electric field radiator is directly coupled to the magnetic loop at a reflective minimum point where a current flowing through the magnetic loop is at a reflective minimum.

22. The antenna as recited in claim 13, wherein the trace includes a first section proximal to the electric field radiator and a second section distal to the electric field radiator, wherein a length and a width of the first section are different than a length and a width of the second section.

23. The antenna as recited in claim 13, wherein the trace includes a first section proximal to the electric field radiator and a second section distal to the electric field radiator, wherein a shape of the first section is different than a shape of the second section.