# US 12,224,786 B2 · Dynamic tuning method for SAR and user equipment thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,224,786 B2 - Document ID: US12224786B2 - Status: Granted - Kind: B2 - Application number: 17/930,501 - Filed: 2022-09-08 - Published: 2024-03-14 - Granted: 2025-02-11 - Earliest claimed: 2022-09-08 - Assignees: Mediatek Inc. - Applicants: Mediatek Inc. - Inventors: Chun-Yen Wu; Cheng-Han Lee - Web page: https://patentgrep.com/patent/US12224786B2 ## CPC - H04B 1/3838: {Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use} - H04W 52/36: with a discrete range or set of values, e.g. step size, ramping or offsets - H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range} - 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 Dynamic tuning method for a specific absorption rate (SAR) is provided. The dynamic tuning method is applied to user equipment (UE). The dynamic tuning method may include the following steps: the UE may determine the back-off value corresponding to the current antenna state; and the UE may tune the conducted power of the radio frequency (RF) circuit of the UE based on the back-off value. ## Claims ### Claim 1 A dynamic tuning method for a specific absorption rate (SAR), applied to a user equipment (UE), comprising: determining, by a processor of the UE, a back-off value corresponding to a current antenna state; and tuning, by the processor, a conducted power of a radio frequency (RF) circuit of the UE based on the back-off value of the UE. ### Claim 2 (depends on 1) The dynamic tuning method of claim 1, wherein different back-off values correspond to different antenna states. ### Claim 3 (depends on 1) The dynamic tuning method of claim 1, wherein the back-off value is determined based on a back-off table recording each back-off value corresponding to each antenna state. ### Claim 4 (depends on 1) The dynamic tuning method of claim 1, wherein the transmission performance comprises a total radiated power (TRP) value. ### Claim 5 (depends on 1) The dynamic tuning method of claim 1, wherein each usage scenario corresponds to one or more antenna states. ### Claim 6 (depends on 5) The dynamic tuning method of claim 5, wherein the back-off values of the one or more antenna states are determined based on a SAR LAB test. ### Claim 7 (depends on 5) The dynamic tuning method of claim 5, wherein a first back-off value of a first antenna state with the best antenna performance within the one or more antenna states is determined based on a SAR LAB test, and other back-off values of other antenna states of the one or more antenna states are determined based on the first back-off value. ### Claim 8 (depends on 2) The dynamic tuning method of claim 2, further comprising: switching, by a switch circuit of the UE, to the current antenna state. ### Claim 9 (depends on 8) The dynamic tuning method of claim 8, wherein the switch circuit comprises at least one of an impedance tuner and an aperture tuner. ### Claim 10 (depends on 8) The dynamic tuning method of claim 8, wherein each antenna state corresponds to a corresponding circuit, wherein when the switch circuit switches to the current antenna state, the corresponding circuit of the current antenna state is enabled. ### Claim 11 A user equipment (UE), comprising: a radio frequency (RF) circuit; and a processor, coupled to the RF circuit, determining a back-off value corresponding to a current antenna state, and tuning a conducted power of the RF circuit of the UE based on the back-off value. ### Claim 12 (depends on 11) The UE of claim 11, wherein different back-off values correspond to different antenna states. ### Claim 13 (depends on 11) The UE of claim 11, wherein the processor determines the back-off value based on a back-off table stored in a memory device and the back-off table records each back-off value corresponding to each antenna state. ### Claim 14 (depends on 11) The UE of claim 11, wherein the transmission performance comprises a total radiated power (TRP) value. ### Claim 15 (depends on 11) The UE of claim 11, wherein each usage scenario corresponds to one or more antenna states. ### Claim 16 (depends on 15) The UE of claim 15, wherein the back-off values of the one or more antenna states are determined based on a SAR LAB test. ### Claim 17 (depends on 15) The UE of claim 15, wherein a first back-off value of a first antenna state with the best antenna performance within the one or more antenna states is determined based on a SAR LAB test, and other back-off values of other antenna states of the one or more antenna states are determined based on the first back-off value. ### Claim 18 (depends on 2) The UE of claim 2, further comprising: a switch circuit, switching to the current antenna state. ### Claim 19 (depends on 18) The UE of claim 18, wherein the switch circuit comprises at least one of an impedance tuner and an aperture tuner. ### Claim 20 (depends on 18) The UE of claim 18, wherein each antenna state corresponds to a corresponding circuit, wherein when the switch circuit switches to the current antenna state, the corresponding circuit of the current antenna state is enabled.