Radio frequency filter fin pack design in consumer electronics
A thermal management device with electromagnetic (EM) shielding includes a fin pack with a plurality of channels. The fin pack has an upper and lower surface. The fin pack has a pack length, pack height, and pack width. The fin pack has fins are oriented connecting the upper surface to the lower surface. The plurality of channels extends from a first end toward a second end. A first channel of the plurality of channels is adjacent the upper surface, and a second channel of the plurality of channels is adjacent the lower surface.
1. A computing device, comprising:
a housing;
a heat source located inside an electromagnetic shield, wherein the electromagnetic shield has an aperture;
one or more electromagnetic radiation emitting electronic components within the housing but outside the electromagnetic shield;
a fin pack located in the electromagnetic shield aperture, the fin pack providing fluid communication through the fin pack from a shielded side to an unshielded side of the electromagnetic shield; and
a heat transfer element located between the heat source and the fin pack.
2. The computing device of claim 1 , the electromagnetic shield defining a shielded side and an unshielded side with the aperture therethrough from the shielded side to the unshielded side.
3. The computing device of claim 1 , the fin pack attenuating electromagnetic radiation in an attenuation range by at least 30 decibels.
4. The computing device of claim 3 , the attenuation range being between 2.2 Gigahertz (GHz) and 2.6 GHz.
5. The computing device of claim 3 , the attenuation range being between 1.8 GHz and 2.0 GHz.
6. The computing device of claim 3 , the attenuation range being between 800 Megahertz (MHz) and 900 MHz.
7. The computing device of claim 1 , the aperture having an area of at least 2 square centimeters (cm 2 ).
8. The computing device of claim 1 , the heat transfer element configured to transfer heat from a processor toward the aperture.
9. The computing device of claim 1 , the fin pack having at least one channel therethrough, the channel providing fluid communication through the fin pack from a first side to an opposite second side.
10. The computing device of claim 1 , the fin pack having a thermal conductivity of at least 100 Watts per meter-Kelvin (W/m·K).
11. The computing device of claim 1 , the fins having at least one rail connected thereto, the rail being positioned to contact more at least two of the fins.
12. The computing device of claim 1 , wherein
the fin pack includes an upper and lower surface, the fin pack having a pack length, pack height, and pack width and having fins are oriented to connect the upper surface to the lower surface;
a plurality of channels extending from a first end toward a second end;
a first channel of the plurality of channels being adjacent the upper surface;
a second channel of the plurality of channels being adjacent the lower surface; and
at least one rail dividing the first channel and the second channel, the at least one rail positioned between the upper surface and the lower surface.
13. The computing device of claim 12 , the first channel and second channel having equal cross-sectional areas.
14. The computing device of claim 12 , at least one of the plurality of channels being rectangular.
15. The computing device of claim 12 , the at least one rail providing electrical communication between a first fin of the fin pack and a second fin of the fin pack.
16. The computing device of claim 15 , the at least one rail being positioned between the first channel and the second channel.
17. The computing device of claim 15 , the at least one rail extending in a direction of the pack length for at least 25% of the pack length.
18. A computing device, comprising:
a housing;
an antenna;
a heat source;
a fin pack in thermal communication with the heat source, the fin pack adjacent the antenna without any added electromagnetic shielding between the fin pack and the antenna, the fin pack having at least one channel therethrough; and
an electromagnetic shield defining a shielded side and an unshielded side with an aperture therethrough from the shielded side to the unshielded side, the fin pack positioned in the aperture, wherein the antenna is positioned on the shielded side, the channel providing fluid communication through the fin pack from the shielded side to the unshielded side,
one or more electromagnetic radiation emitting electronic components within the housing but outside the electromagnetic shield;
the heat source including a heat transfer element configured to transfer heat from a processor toward the aperture.
19. The computing device of claim 18 , wherein the fins have at least one rail connected thereto, the rail being positioned to contact more at least two of the fins.
20. A computing device, comprising:
an antenna;
a heat source;
a fin pack in thermal communication with the heat source, the fin pack adjacent the antenna, the fin pack having at least one channel therethrough, the fin pack attenuating electromagnetic radiation in an attenuation range by at least 30 decibels, the attenuation range being between 2.2 Gigahertz (GHz) and 2.6 GHz, the fins having at least one rail connected thereto, the rail being positioned to contact more at least two of the fins; and
an electromagnetic shield defining a shielded side and an unshielded side with an aperture therethrough from the shielded side to the unshielded side, the fin pack positioned in the aperture, the aperture having an area of at least 2 square centimeters (cm 2 ), wherein the antenna is positioned on the shielded side, the channel providing fluid communication through the fin pack from the shielded side to the unshielded side,
the heat source including a heat transfer element configured to transfer heat from a processor toward the aperture.