POWER AND GROUND PLANES HAVING MODIFIED RESONANCE FREQUENCIES

• US 20120162932A1
• Filed: 12/22/2010
• Published: 06/28/2012
• Est. Priority Date: 12/22/2010
• Status: Abandoned Application

• Current Assignee: HGST Netherlands B.V. (Western Digital Corporation)
• Original Assignee: HGST Netherlands B.V. (Western Digital Corporation)
• Inventors: CONTRERAS, JOHN T., WALLASH, ALBERT J.
• Application Number:
  US12/976,875
• Publication Number:
  US 20120162932A1
• Time in Patent Office: Days
• US Class Current: 361/748
• CPC Class Codes: H05K 1/0224 Patterned shielding planes, ground planes or power planes H05K1/0253 takes precedence
• CPC Class Codes: H05K 1/0253 Impedance adaptations of transmission lines by special lay-out of power planes, e.g. providing openings H05K1/0251 takes precedence

Abstract

Adjusting the resonance of a power distribution network in a device to ensure a resonance frequency of the device is outside of a frequency band of wireless signals, other interference signals, or interference signals intrinsic to the device. The resonance frequency may be adjusted by cutting slices into the power and/or ground planes such that a serpentine pattern (or other desired pattern) is formed. The serpentine pattern increases the length that the current travels along the power/ground plane and thus, changes the resonance frequency of the device.

Claims

1. A PCB power/ground plane, comprising:

a main portion of the plane; and

a resonance modification element extending from the main portion provisioned with a plurality of interleaved and parallel openings to form a serpentine path from a first end of the element to a second end of the element, the configuration of the openings having been selected to achieve a desired resonance frequency different from a undesired resonance frequency produced by the modification element in the absence of the openings.

2. The PCB power/ground plane of claim 1, wherein the resonance frequencies of the new resonance modification element is altered more than 100 MHz about the original resonance frequencies.

3. The PCB power/ground plane of claim 1, wherein the resonance frequency of the new resonance modification element is more than 100 MHz above or below 1.8 GHz.

4. The PCB power/ground plane of claim 3, wherein the resonance frequency of the new resonance modification element is more than 100 MHz above or below 900 MHz.

5. The PCB power/ground plane of claim 4, wherein the PCB power/ground plane is disposed within a hard disk drive.

6. The PCB power/ground plane of claim 1, wherein the resonance frequency of the new resonance modification element is more than 100 MHz above or below 900 MHz.

7. The PCB power/ground plane of claim 6, wherein the PCB power/ground plane is disposed within a hard disk drive.

8. The PCB power/ground plane of claim 1, wherein the PCB power/ground plane is disposed within a hard disk drive.

9. A device, comprising:

a wireless card configured to operate at a wireless frequency; and

a power/ground plane comprising a body extending from a first end to a second end, wherein the body has a plurality of interleaved slices formed therein to create a serpentine pattern that alters the resonance frequency of the body relative to the resonance frequency of the body in absence of the plurality of interleaved slices, and wherein the resonance frequency is outside the wireless frequency.

10. The device of claim 9, wherein the resonance frequency of the power/ground plane is more than 100 MHz above or below 1.8 GHz.

11. The device of claim 10, wherein the resonance frequency of the power/ground plane is more than 100 MHz above or below 900 MHz.

12. The device of claim 9, wherein the resonance frequency of the power/ground plane is more than 100 MHz above or below 900 MHz.

13. The device of claim 12, further comprising a SOC chip coupled to the power/ground plane.

14. The device of claim 13, wherein the plurality of interleaved slices are closer to the SOC chip than to a location where power is coupled to the power/ground plane.

15. A device, comprising:

a wireless card; and

a hard disk drive having a power/ground plane, comprising a body extending from a first end to a second end, wherein the body has a plurality of interleaved slices formed therein to create a serpentine pattern that alters the resonance frequency of the body relative to the resonance frequency of the body in absence of the plurality of interleaved slices.

16. The device of claim 15, wherein the resonance frequency of the power/ground plane is more than 100 MHz above or below 1.8 GHz.

17. The device of claim 16, wherein the resonance frequency of the power/ground plane is more than 100 MHz above or below 900 MHz.

18. The device of claim 17, further comprising a SOC chip coupled to the power/ground plane.

19. The device of claim 18, wherein the plurality of interleaved slices are closer to the SOC chip than to a location where power is coupled to the power/ground plane.

20. The device of claim 15, wherein the resonance frequency of the power/ground plane is more than 100 MHz above or below 900 MHz.

21. The device of claim 15, further comprising a SOC chip coupled to the power/ground plane, wherein the plurality of interleaved slices are closer to the SOC chip than to a location where power is coupled to the power/ground plane.