Pin fin ground plane for a patch antenna

• US 7,136,017 B2
• Filed: 12/03/2004
• Issued: 11/14/2006
• Est. Priority Date: 09/22/2004
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Navini Networks, Inc. (Cisco Systems, Inc.)
• Inventors: Grabner, John, Smith, Richard L., Condon, Edward B.
• Primary Examiner(s): WIMER, MICHAEL C
• Application Number:
  US11/003,255
• Publication Number:
  US 20060071859A1
• Time in Patent Office: 711 Days
• Field of Search: 343/700.MS, 343/702, 343/720, 343/853
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/02 Arrangements for de-icing; Arrangements for drying-out ; Arrangements for cooling; Arrangements for preventing corrosion
• CPC Class Codes: H01Q 1/2258 used with computer equipment
• CPC Class Codes: H01Q 1/48 Earthing means; Earth screens; Counterpoises
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 25/005 providing two patterns of opposite direction; back to back antennas H01Q25/004 takes precedence
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40

Abstract

A system and method improves linearly-polarized microstrip patch antenna performance and fabrication through the incorporation of a pin fin ground plane and an integral antenna feed assembly. In one embodiment, a patch antenna system includes an antenna area with a patch antenna that provides radio communications. A heat dissipation member is coupled to the antenna area and includes a plurality of pins that provide for both the dissipation of heat from the antenna area and a ground plane for the antenna area. An antenna feed line is further coupled with the antenna patch for providing an electrical connection from the antenna patch to other electronic circuitries, such as a wireless device that may be mechanically coupled to the heat dissipation member. Heat generated during the operation of the wireless device is directed to ambient air by way of the heat dissipation member.

Claims

1. A patch antenna system comprising:

a patch antenna that provides radio communications;

a heat dissipation member mechanically coupled to the patch antenna and including a plurality of pins that dissipate heat from a patch antenna area, the heat dissipation member providing an aggregate surface that provides a ground plane for the patch antenna, the aggregate surface including at least surfaces of the pins; and

an antenna feed line coupled to the patch antenna and providing an electrical connection between the patch antenna and further electronic circuitries,

wherein the pins each include a top surface that is joined to a substrate upon which the patch antenna is disposed.

2. The patch antenna system of claim 1, wherein the patch antenna is a linearly-polarized, single-band patch antenna.

3. The patch antenna system of claim 1, wherein the pins are generally cylindrical in shape and include a circular, square, rectangular or elliptical cross section.

4. The patch antenna system of claim 1, further comprising a dielectric substrate disposed between the patch antenna and the plurality of pins, the dielectric substrate mechanically coupling the patch antenna formed thereon to the plurality of pins and providing electrical isolation therebetween.

5. The patch antenna system of claim 1, wherein the patch antenna and the antenna feed line each form part of one integral element.

6. The patch antenna system of claim 1, wherein the heat dissipation member comprises a heatsink.

7. The patch antenna system of claim 1, wherein the pins are arranged in a grid formation.

8. The patch antenna system of claim 1, wherein the pins are metallic.

9. The patch antenna system of claim 1 wherein each pin has a top surface and the top surfaces are co-planar and each contacts a dielectric substrate upon which the patch antenna is formed.

10. The patch antenna system of claim 1, wherein the heat dissipation member comprises the plurality of pins extending from a common surface of a base member and the aggregate surface further includes the common surface and the surfaces of the pins include top and side surfaces of the pins.

11. The patch antenna system of claim 1, further comprising a wireless device mechanically coupled to the heat dissipation member and electrically coupled to the antenna feed line, the heat dissipation member transferring heat from the wireless device, through the pins and to ambient air to cool the wireless device, and the antenna feed line electrically coupling the patch antenna and the wireless device.

12. The patch antenna system of claim 11, wherein the patch antenna and the antenna feed line are each part of one integral element.

13. The patch antenna system of claim 11, wherein the heat dissipation member comprises an electromagnetic interference shield that shields the wireless device from electromagnetic emissions.

14. An electronic component comprising:

a duality of patch antenna systems, each including;

a patch antenna that provides radio communications;

a heat dissipation member mechanically coupled to the patch antenna and including a plurality of pins that dissipate heat from an antenna area, the heat dissipation member providing an aggregate surface that provides a ground plane for the patch antenna; and

an antenna feed line coupled to the patch antenna and providing an electrical connection from the patch antenna to other electronic circuitries, and

a wireless device mechanically coupled to each heat dissipation member and mechanically and electrically coupled to each antenna feed line, the heat dissipation member directing heat from the device to ambient air and the antenna feed line electrically coupling the patch antenna and the wireless device.

15. The electronic component as in claim 14, wherein each aggregate surface comprises top and side surfaces of the pins and a common surface from which the plurality of pins extend.

16. The electronic component as in claim 14, wherein each patch antenna is formed on a dielectric substrate that contacts co-planar top surfaces of the pins.

17. The method of claim 16, further comprising operating at least one of the wireless device and the patch antenna thereby generating heat and the heat dissipation member directing the generated heat to ambient air.

18. A method for forming a patch antenna assembly, the method comprising:

mechanically coupling a patch antenna to a heat dissipation member having a plurality of heatsink pins and an aggregate surface that serves as a ground plane for the patch antenna;

electrically coupling the patch antenna to a wireless device using an antenna feed line; and

mechanically coupling the heat dissipation member to the wireless device to provide a path of heat transfer from the wireless device to ambient air.

19. The method of claim 18, further comprising forming one integral unit that includes the patch antenna and the antenna feed line as parts thereof.

20. The method of claim 18, wherein the plurality of heatsink pins are joined to a common surface of a base member and the aggregate surface comprises the common surface and side and top surfaces of the pins.

21. The method of claim 18, further comprising electrically isolating the patch antenna from the heat dissipation member by forming the patch antenna on a dielectric substrate and positioning the dielectric substrate adjacent the heat dissipation member.