Wireless communications assemblies for mitigating radio frequency desensitization
A computing device includes: a housing having a plurality of outer walls; a first wireless communications assembly supported within the housing and including a first antenna; a wired communications assembly supported within the housing and including a port on one of the outer walls, the port configured to connect with another device; and a second wireless communications assembly supported within the housing and including a second antenna affixed to an electromagnetic shield disposed adjacent to the port of the wired communications assembly, the electromagnetic shield configured to shield the first antenna from electromagnetic noise generated by the wired communications assembly.
1 . A computing device, comprising:
a housing having a plurality of outer walls;
a first wireless communications assembly supported within the housing and including a first antenna;
a wired communications assembly supported within the housing and including a port on one of the outer walls, the port configured to connect with another device; and
a second wireless communications assembly supported within the housing and including a second antenna affixed to an electromagnetic shield disposed adjacent to the port of the wired communications assembly, the electromagnetic shield configured to shield the first antenna from electromagnetic noise generated by the wired communications assembly.
2 . The mobile computing device of claim 1 , wherein the electromagnetic shield includes a sheet of magnetically permeable material carrying the second antenna.
3 . The mobile computing device of claim 2 , wherein the magnetically permeable material has a relative magnetic permeability of at least 100.
4 . The mobile computing device of claim 2 , wherein the second antenna includes at least one conductive loop disposed on a first surface of the sheet.
5 . The mobile computing device of claim 2 , wherein the second antenna extends around a perimeter of a first surface of the sheet.
6 . The mobile computing device of claim 2 , wherein the outer walls include a back wall, and wherein the magnetically permeable sheet is substantially parallel to the back wall.
7 . The mobile computing device of claim 6 , wherein the sheet includes a first surface facing the back wall, and a second surface opposite the first surface; and
wherein the second antenna is disposed on the second surface.
8 . The mobile computing device of claim 1 , further comprising:
an electrical conduit within the housing, the electrical conduit configured to connect the port to a controller;
wherein the electromagnetic shield is disposed adjacent to the port and the electrical conduit.
9 . The mobile computing device of claim 1 , further comprising:
a circuit board carrying the wired communications assembly;
wherein the electromagnetic shield is disposed to place the port between the electromagnetic shield and the circuit board.
10 . The mobile computing device of claim 9 , wherein the electromagnetic shield includes:
a first portion at a first orientation relative to the circuit board; and
a second portion at a second orientation relative to the circuit board.
11 . The mobile computing device of claim 10 , wherein the first portion is substantially planar, and substantially parallel to the circuit board.
12 . The mobile computing device of claim 10 , wherein the second portion is substantially planar, and substantially perpendicular to the first portion.
13 . The mobile computing device of claim 1 , further comprising an auxiliary electromagnetic shield disposed adjacent to the port of the wired communications assembly.
14 . The mobile computing device of claim 1 , further comprising:
a third wireless communications assembly supported within the housing and including a third antenna;
wherein the electromagnetic shield is further configured to shield the third antenna from electromagnetic noise generated by the wired communications assembly.
15 . The mobile computing device of claim 1 , wherein the second wireless communications assembly includes a near-field communication (NFC) transceiver, and wherein the wired communications assembly includes a universal serial bus (USB) transceiver.
16 . A computing device, comprising:
a first wireless communications assembly including a first antenna;
a wired communications assembly including a port configured to connect the computing device with another device; and
a second wireless communications assembly including:
an electromagnetic shield disposed adjacent to the port, and
a second antenna affixed to the electromagnetic shield.
17 . The computing device of claim 16 , wherein an operating frequency range of the first antenna overlaps with a frequency range of electromagnetic noise generated by the port.
18 . The computing device of claim 16 , wherein an operating frequency range of the second antenna does not overlap with a frequency range of electromagnetic noise generated by the port.
19 . The computing device of claim 16 , wherein the electromagnetic shield includes a magnetically permeable sheet.
20 . The computing device of claim 16 , wherein the electromagnetic shield is disposed between the port and the first antenna.