System and method for elecromagnetic interference mitigation for an antenna element and speaker co-located within a cavity formed behind a speaker grill
An information handling system to wirelessly transmit and receive data may include a base chassis including a metal C-cover and metal D-cover to house a processor, a memory, and a wireless adapter, the metal C-cover to house a speaker grill, the speaker grill covering a speaker to emit audio waves; the speaker grill formed within the C-cover to emit a target radio frequency (RF) including a slot formed around a portion of the speaker grill forming a peninsula on the speaker grill that is physically separated from the C-cover; an antenna element placed behind the speaker grill and operatively coupled to the wireless adapter; an electromagnetic interference (EMI) shield forming a cavity enclosing the speaker and the antenna element, including a plurality of metallic shielding walls extending from the C-cover to a D-cover of the information handling system; and a conductive rubber gasket placed between the plurality of conductive walls and the D-cover to shield the cavity from EMI sources.
1. An information handling system to wirelessly transmit and receive data comprising:
a base chassis including a metal C-cover and metal D-cover to house a processor, a memory, and a wireless adapter, the metal C-cover to house a speaker grill, the speaker grill covering a speaker to emit audio waves;
the speaker grill formed within the C-cover to emit a target radio frequency (RF) including a slot formed around a portion of the speaker grill forming a peninsula on the speaker grill that is physically separated from the C-cover;
an antenna element placed behind the speaker grill and operatively coupled to the wireless adapter;
an electromagnetic interference (EMI) shield forming a cavity enclosing the speaker and the antenna element, comprising:
a plurality of metallic shielding walls extending from the C-cover to a D-cover of the information handling system; and
a conductive rubber gasket placed between the plurality of conductive walls and the D-cover to shield the cavity from EMI sources.
2. The information handling system of claim 1 , wherein a first metallic wall of the plurality of metallic walls comprises a metallic overlay placed over a portion plastic audio insert placed within cavity of the C-cover.
3. The information handling system of claim 1 , comprising a plastic audio insert formed within the cavity wherein a portion of the plastic audio insert comprises a metallic overlay forming a first of the plurality of metallic walls.
4. The information handling system of claim 1 , comprising a foam rib placed between the D-cover and the speaker to maintain the speaker in a position above the D-cover.
5. The information handling system of claim 1 , comprising a plurality of plastic speaker arms extending from the C-cover in the cavity to maintain the speaker a distance away from the speaker grill and D-cover.
6. The information handling system of claim 1 , wherein the plurality of metallic walls and conductive rubber gasket extend to a grounding source within the cavity.
7. The information handling system of claim 1 , wherein the D-cover forms one of the plurality of metallic walls of the EMI shield.
8. The information handling system of claim 1 , wherein a first metallic wall of the plurality of metallic walls comprises an metallic foil layer placed over non-metallic plastic audio insert placed within the cavity, the metallic foil layer being electrically coupled to the conductive rubber gasket.
9. A C-cover and D-cover assembly for an information handling system comprising:
a metal C-cover to house a speaker grill, the speaker grill covering a speaker to emit audio waves, where the speaker grill formed within the C-cover including a slot formed around a portion of the speaker grill forming a peninsula on the speaker grill that is physically separated from the C-cover to operate as an antenna;
an antenna element placed behind the speaker grill;
an electromagnetic interference (EMI) shield forming a cavity to house the antenna element and speaker, comprising:
a plurality of metallic shielding walls extending from the C-cover to the D-cover, wherein a first metallic wall of the plurality of metallic shielding walls comprise a metallic overlay placed over a plastic audio insert placed within the cavity of the C-cover.
10. The assembly of claim 9 , comprising a conductive rubber gasket placed between at least one of the plurality of metallic walls and the D-cover to shield the cavity from EMI sources and seal the cavity to audio waves produced by the speaker and wherein the plurality of metallic walls and conductive rubber gasket extend a grounding plane to a grounding source within the cavity.
11. The assembly of claim 9 , comprising a plastic audio insert formed within the cavity wherein a portion of the plastic audio insert comprises a metallic overlay forming a first of the plurality of metallic walls.
12. The assembly of claim 9 , comprising a foam rib placed between the D-cover and the speaker to maintain the speaker is a position above the D-cover.
13. The assembly of claim 9 , comprising a plurality of plastic speaker arms extending from the C-cover in the cavity to maintain the speaker a distance away from the speaker grill and D-cover.
14. The assembly of claim 9 , wherein the D-cover forms one of the plurality of metallic walls to form an EMI shield within the cavity.
15. The assembly of claim 9 , wherein the speaker grill includes a slot formed around a portion of the speaker grill and wherein the antenna element is capacitively coupled to the slot of the speaker grill to emit an RF EM signal from a portion of the slot of the speaker grill.
16. An information handling system to transmit a communication signal comprising:
a metal C-cover and a metal D-cover assembly including a processor, a memory, and a wireless adapter, the metal C-cover to house a speaker grill, the speaker grill covering a speaker to emit audio waves;
the speaker grill formed within the C-cover to cover a speaker and antenna element, the speaker grill comprising:
a slot formed around a portion of the speaker grill forming a peninsula on the speaker grill that is physically separated from the C-cover;
a plurality of electromagnetic isolation (EMI) shielding walls placed around the perimeter of the speaker grill to form a cavity behind the speaker grill;
wherein the EMI shielding walls extend from the C-cover to a D-cover of the information handling system;
wherein the EMI shielding walls include a conductive rubber gasket placed between at least one of the EMI shielding walls and the D-cover to shield the cavity from EMI sources; and
wherein a first EMI shielding wall of the plurality of EMI shielding walls comprises a metallic overlay placed over a non-metallic portion of the C-cover.
17. The information handling system of claim 16 , comprising a plastic audio insert formed within the cavity wherein a portion of the plastic audio insert comprises a metallic overlay forming the first EMI shielding wall of the plurality of EMI shielding walls.
18. The information handling system of claim 16 , comprising a plurality of plastic speaker arms extending from the C-cover to maintain the speaker a distance away from the speaker grill and D-cover.
19. The information handling system of claim 16 , comprising a foam rib placed between the D-cover and speaker to maintain the speaker is a position above the D-cover.
20. The information handling system of claim 16 , wherein the metallic overlay is a metallic foil.