# US 2014/0197830 A1 · Proximity detection via magnetic resonance coupling > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197830 A1 - Document ID: US20140197830A1 - Status: Published application - Kind: A1 - Application number: 13/977,560 - Filed: 2011-12-28 - Published: 2014-07-17 - Earliest claimed: 2011-12-28 - Assignees: Intel Corporation - Inventors: Minglei Wang; Xue Yang; Xingang Guo - Web page: https://patentgrep.com/patent/US20140197830A1 ## CPC - G01B 7/14: for measuring distance or clearance between spaced objects or spaced apertures (G01B7/30 takes precedence) - G01R 33/20: involving magnetic resonance (medical aspects A61B5/055; magnetic resonance gyrometers G01C19/60) - H04B 5/22: Capacitive coupling - H04B 5/73: for taking measurements, e.g. using sensing coils - H04W 8/005: {Discovery of network devices, e.g. terminals} - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A magnetic resonance technology is used to implement front and back proximity sensing capability for wireless devices such as a laptap device. For example, a high quality (Q) factor coil antenna may be embedded in a display, such as a liquid crystal display, of a first laptap device to detect other wireless devices (e.g., a second laptap) that are within coupling distance of the first laptap device. In this example, the second laptap device induces a sine wave signal to the first laptap device if the second laptap device is physically located at backside of the first laptap device. Otherwise, the second laptap device may induce a cosine wave signal to the first laptap device if the second laptap device is physically located at the front side of the first laptap device. ## Claims ### Claim at position 1 1-16. (canceled) ### Claim 17 A method of proximity detection via magnetic resonance coupling comprising: configuring a first wireless device to receive magnetic resonance signal from a second wireless device; and determining bearing location of a second wireless device based on a signal phase of the received magnetic resonance signal, wherein the bearing location includes the second wireless device to be physically located at front side or at backside of the first wireless device. ### Claim 18 (depends on 17) The method of claim 17, wherein the configuring includes setting maximum coupling distance, which is based on a coil diameter of high quality (Q) factor antenna embedded at a display of the first wireless device, for proximity sensing range of the first wireless device. ### Claim 19 (depends on 17) The method of claim 17, wherein the configuring includes setting a threshold for the magnetic resonance signal to indicate presence of the second wireless device within a configured maximum coupling distance. ### Claim 20 (depends on 17) The method of claim 17, further comprising receiving an induced sine wave signal from the second wireless device that is physically located at the backside of the first wireless device. ### Claim 21 (depends on 17) The method of claim 17, further comprising receiving an induced cosine wave signal from the second wireless device that is physically located at the front side of the first wireless device, wherein the cosine wave signal is derived from a sine wave signal generated by the second wireless device due to opposite physical location. ### Claim 22 A first wireless device comprising: one or more processors; memory configured to the one or more processors; a magnetic resonance detector that is configured to receive magnetic resonance signal from a second wireless device, wherein bearing location of the second wireless device is determined by a signal phase of the received magnetic resonance signal, the bearing location is to indicate that the second wireless device to be physically located at front side or at back side of the first wireless device; and a high quality factor (Q) coil antenna that supplies the magnetic resonance signal to the magnetic resonance detector based on the magnetic resonance signal induced by the second wireless device. ### Claim 23 (depends on 22) The first wireless device of claim 22, wherein the magnetic resonance detector is configured to indicate a maximum coupling distance, which is based at least in part on a coil diameter of high quality (Q) factor antenna embedded in a display of the first wireless device, for proximity sensing range of the first wireless device. ### Claim 24 (depends on 22) The first wireless device of claim 22, wherein the magnetic resonance detector is configured to include a threshold that indicates presence of the second wireless device within a configured maximum coupling distance. ### Claim 25 (depends on 22) The first wireless device of claim 22, wherein the magnetic resonance detector includes receiving an induced sine wave signal from the second wireless device that is physically located at the backside of the first wireless device. ### Claim 26 (depends on 22) The first wireless device of claim 22, wherein the magnetic resonance detector includes receiving an induced cosine wave signal that is derived from a sine wave signal generated by the second wireless device that is physically located at the front side of the first wireless device. ### Claim 27 (depends on 22) The first wireless device of claim 22, wherein the signal phase received from the second wireless device located at the backside of the first wireless device is one hundred eighty degrees (180°) out of phase with the signal phase received when the second wireless device is located at the front side of the first wireless device. ### Claim 28 A high quality (Q) factor coil antenna embedded in a display of a first wireless device, the coil antenna to supply a detected magnetic resonance signal to a magnetic resonance detector, which detects bearing location of a second wireless device that induced the magnetic resonance signal to the high Q coil antenna, wherein the bearing location of the second wireless device is determined by a signal phase of the supplied magnetic resonance signal, the bearing location includes the second wireless device to be physically located at front side or at backside of the first wireless device. ### Claim 29 (depends on 28) The antenna of claim 28, wherein the coupled magnetic resonance detector is configured to indicate a maximum coupling distance, which is based at least in part on a coil diameter of the coil antenna, for proximity sensing range of the first wireless device. ### Claim 30 (depends on 28) The antenna of claim 28, wherein the induced magnetic resonance signal includes a sine wave signal from the second wireless device that is physically located at the backside of the first wireless device. ### Claim 31 (depends on 28) The antenna of claim 28, wherein the induced magnetic resonance signal includes a cosine wave signal from the second wireless device that is physically located at the front side of the first wireless device. ### Claim 32 (depends on 28) The antenna of claim 28, wherein the signal phase received from the second wireless device located at the backside of the first wireless device is one hundred eighty degrees (180°) out of phase with the signal phase received when the second wireless device is located at the front side of the first wireless device.