Adaptation of polyphase waveguide probes

Patent metadata

Field	Value
Publication number	US-10153638-B2
Application number	US-201816017516-A
Country	US
Kind code	B2
Filing date	Jun 25, 2018
Priority date	Sep 11, 2014
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

Disclosed are various embodiments for transmitting energy conveyed in the form of a guided surface-waveguide mode along a lossy conducting medium such as, e.g., the surface of a terrestrial medium by exciting a polyphase waveguide probe. A probe control system can be used to adjust the polyphase waveguide probe based at least in part upon characteristics of the lossy conducting medium.

First claim

Therefore, the following is claimed:

1. A method, comprising:
generating, via a polyphase waveguide probe, at least one resultant field that synthesizes a wave front incident with a lossy conducting medium at a complex Brewster angle of incidence by substantially mode-matching the at least one resultant field to a Zenneck surface wave mode on a surface of the lossy conducting medium, the polyphase waveguide probe comprising a first charge terminal and a second charge terminal; and
adjusting the polyphase waveguide probe to improve the mode-matching of the Zenneck surface wave mode in response to detecting one or more conditions associated with the polyphase waveguide probe, wherein adjusting the polyphase waveguide probe comprises adjusting at least one of a phase or a magnitude on at least one of the first charge terminal or the second charge terminal.

2. The method of claim 1 , wherein the polyphase waveguide probe comprises a probe coupling circuit coupled to the first charge terminal and the second charge terminal, and further comprising imposing, via the probe coupling circuit, a first voltage magnitude to the first charge terminal and a second voltage magnitude to the second charge terminal.

3. The method of claim 2 , wherein the first voltage magnitude is out of phase from the second voltage magnitude by about 180 degrees.

4. The method of claim 2 , wherein adjusting the polyphase waveguide probe comprises adjusting a size of at least one of an inductive reactance or a capacitive reactance of the probe coupling circuit.

5. The method of claim 1 , wherein adjusting the polyphase waveguide probe comprises adjusting a size of at least one of the first charge terminal or the second charge terminal.

6. The method of claim 1 , wherein adjusting the polyphase waveguide probe further comprises adjusting a height of at least one of the first charge terminal or the second charge terminal relative to the lossy conducting medium.

7. The method of claim 1 , wherein adjusting the polyphase waveguide probe further comprises adjusting a distance between the first charge terminal and the second charge terminal.

8. The method of claim 1 , wherein the one or more conditions comprises at least one of a field strength of the at least one resultant field, a conductivity of the lossy conducting medium, a real power delivery of an excitation source coupled to the polyphase waveguide probe, or an overloading of the excitation source.

9. A system, comprising:
a polyphase waveguide probe comprising a first charge terminal and a second charge terminal elevated over a lossy conducting medium, the polyphase waveguide probe being configured to launch a Zenneck surface wave by generating at least one resultant field that synthesizes a wave front incident with the lossy conducting medium at a complex Brewster angle of incidence; and
a probe control system configured to adjust the polyphase waveguide probe to improve an electrical field strength of the at least one resultant field in response to a detection of at least one of the electric field strength or the conductivity of the lossy conducting medium.

10. The system of claim 9 , further comprising a ground parameter meter located at a defined distance from the polyphase waveguide probe, the conductivity being detected by the ground parameter meter.

11. The system of claim 9 , further comprising a field meter located at a defined distance from the polyphase waveguide probe, the electric field strength being detected by the field meter.

12. The system of claim 9 , wherein the first charge terminal is positioned at a first height over the lossy conducting medium and the second charge terminal is positioned at a second height over the lossy conducting medium.

13. The system of claim 12 , wherein adjusting the polyphase waveguide probe comprises adjusting at least one of the first height of the first charge terminal or the second height of the second charge terminal.

14. The system of claim 9 , wherein the electrical field strength is directly proportional to a magnitude of a charge imposed on the first charge terminal.

15. The system of claim 9 , further comprising a probe coupling circuit coupled to the first charge terminal and the second charge terminal, the probe coupling circuit configured to impose a first voltage on a first charge terminal and a second voltage on a second charge terminal, the first voltage being out of phase from the second voltage.

16. The system of claim 9 , wherein the polyphase waveguide probe comprises a coil, the first charge terminal and the second charge terminal being coupled to the coil via at least one variable tap, and adjusting the polyphase waveguide probe comprises adjusting a position of the at least one variable tap.

17. A method, comprising:
transmitting energy along a surface of a lossy conducting medium by exciting a first charge terminal and a second charge terminal of a polyphase waveguide probe with excitation voltages to synthesize at least one resultant field that substantially matches a Zenneck surface waveguide mode of the lossy conducting medium;
detecting a change in a condition associated with the polyphase waveguide probe; and
adjusting at least one of a phase or a magnitude of at least one of the first charge terminal or the second charge terminal in response to detecting the change in the condition.

18. The method of claim 17 , wherein the condition comprises at least one of a field strength of the at least one resultant field, a conductivity of the lossy conducting medium, a real power delivery of an excitation source, or an overloading of the excitation source.

19. The method of claim 17 , further comprising adjusting a height of at least one of the first charge terminal or the second charge terminal above the lossy conducting medium to improve a mode-matching of the Zenneck surface wave mode.

20. The method of claim 17 , wherein the first charge terminal and the second charge terminal are coupled to a coil of the polyphase waveguide probe via at least one variable tap, and adjusting the at least one of the phase or the magnitude of at least one of the first charge terminal or the second charge terminal comprises adjusting a positioning of the at least one variable tap.

Assignees

• Cpg Technologies Llc

Inventors

• Corum James F
• Corum Kenneth L

Classifications

• G01S13/0218 Primary

  Very long range radars, e.g. surface wave radar, over-the-horizon or ionospheric propagation systems (for meteorological use G01S13/95) · CPC title

• H01Q9/30

  with feed to end of elongated active element, e.g. unipole (H01Q9/44 takes precedence) · CPC title

• H01P5/00

  Coupling devices of the waveguide type · CPC title

• H01Q1/00 Primary

  Details of, or arrangements associated with, antennas (arrangements for varying orientation of directional pattern H01Q3/00) · CPC title

• H02J3/00 Primary

  Circuit arrangements for AC mains or AC distribution networks · CPC title