Power beaming system with printer circuit radiating elements having resonating cavities

• US 5,218,374 A
• Filed: 10/10/1989
• Issued: 06/08/1993
• Est. Priority Date: 09/01/1988
• Status: Expired due to Fees

• Current Assignee: BAE Systems Information and Electronic Systems Integration Incorporated (BAE Systems Plc)
• Original Assignee: Apti, Inc.
• Inventors: Cha, James T., Koert, Peter
• Primary Examiner(s): Hille, Rolf
• Assistant Examiner(s): BROWN, PETER T
• Application Number:
  US07/419,144
• Time in Patent Office: 1,337 Days
• Field of Search: 343/700 MS File, 343/769, 343/778, 343/789, 343/793, 343/795, 343/797, 343/846, 307/151, 361/395, 333/230, 333/250
• US Class Current: 343/789
• CPC Class Codes: H01Q 1/248 provided with an AC/DC converting device, e.g. rectennas
• CPC Class Codes: H01Q 21/065 Patch antenna array
• CPC Class Codes: Y10S 343/02 Satellite-mounted antenna

Abstract

A system and method for "power beaming" energy from a source at high frequencies and rectifying such energy to provide a source of DC energy is disclosed. The system operates at a frequency of at least 10 GHz and incorporates a rectenna array having a plurality of rectenna structures that utilize circuit elements formed with microstrip circuit techniques. Each rectenna element is associated with a resonating cavity structure.

Claims

1. A rectenna array including at least one rectenna structure, comprising:

a.) a top layer containing a top and bottom surface on which conductive coating is deposited, said bottom surface conductive coating being deposited to form an antenna, and said top surface conductive coating being formed to include a hole to allow RF energy to pass to said antenna;

b.) a diode connected to said antenna; and

c.) a resonating cavity structure containing at least one resonating cavity, wherein said resonating cavity structure is located adjacent said bottom surface and said resonating cavity is aligned with said hole in said top surface.

2. A rectenna array as claimed in claim 1, wherein said resonating cavity structure comprises a cavity substrate made of a conductive material.

3. A rectenna array as claimed in claim 1, wherein said resonating cavity structure comprises a cavity substrate having said resonating cavity formed therein, and a conductive coating applied over substantially the entire surface of said resonating cavity.

4. A rectenna array as claimed in claim 1, wherein said resonating cavity structure comprises a cavity substrate top connected to a cavity substrate bottom.

5. A rectenna array as claimed in claim 1, wherein an insulating layer is provided between said top layer and said resonating cavity structure.

6. A rectenna array as claimed in claim 1, wherein said resonating cavity structure comprises a resonating canister attached to said top layer.

7. A rectenna array as claimed in claim 1, wherein said antenna comprises a single dipole to receive linearly polarized RF energy.

8. A rectenna array as claimed in claim 1, wherein said antenna comprises a cross dipole to receive circularly polarized RF energy.

9. A rectenna array as claimed in claim 1, wherein said antenna comprises a bow tie antenna.

10. A rectenna array as claimed in claim 1, wherein said antenna comprises a V-line probe.

11. A rectenna array as claimed in claim 1, wherein said antenna comprises a cross-line probe.

12. A rectenna array as claimed in claim 1, wherein said antenna comprises a straight line probe.

13. A rectenna array as claimed in claim 1, wherein said antenna comprises a loop probe.

14. A rectenna array including at least one rectenna structure, comprising:

a) a top layer containing a top and bottom surface on which conductive coating is deposited, said bottom surface conductive coating being deposited to form an antenna, and said top surface conductive coating being formed to include a hole to allow RF energy to pass to said antenna;

b) a diode connected to said antenna; and

c) a resonating cavity structure containing at least one resonating cavity, wherein said resonating cavity structure is located adjacent said bottom surface and said resonating cavity is aligned with said hole in said top surface, and

wherein said top layer includes a focus element formed within said hole.

15. A rectenna array as claimed in claim 14, wherein a feed line connected to the antenna forms a low pass filter and DC bus.

16. A rectenna array including at least one rectenna structure, comprising:

a) a top layer containing a top and bottom surface on which conductive coating is deposited, said bottom surface conductive coating being deposited to form an antenna, and said top surface conductive coating being formed to include a hole to allow RF energy to pass to said antenna;

b) a diode connected to said antenna; and

c) a resonating cavity structure containing at least one resonating cavity, wherein said resonating cavity structure is located adjacent said bottom surface and said resonating cavity is aligned with said hole in said top surface, and wherein said resonating cavity structure further comprises a resonating canister attached to said top layer, said canister having no surrounding lower substrate.