# US 12,603,712 B2 · Antenna adjustment device and method for communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,712 B2 - Document ID: US12603712B2 - Status: Granted - Kind: B2 - Application number: 18/411,001 - Filed: 2024-01-11 - Published: 2025-06-05 - Granted: 2026-04-14 - Earliest claimed: 2023-12-05 - Assignees: Moxa Inc. - Applicants: Moxa Inc. - Inventors: Jung-Chieh Ko - Web page: https://patentgrep.com/patent/US12603712B2 ## CPC - H04B 1/0053: {with common antenna for more than one band} - H04B 17/221: {of receiver antennas, e.g. as to amplitude or phase} - H04B 1/0458: {Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages (matching circuits in general H03H)} - H04B 1/18: Input circuits, e.g. for coupling to an antenna or a transmission line (coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H) - H04B 17/12: of transmit antennas, e.g. of the amplitude or phase - H04B: TRANSMISSION ## Abstract An antenna adjustment device, for a user equipment, wherein the user equipment is coupled to at least one antenna to receive or transmit a wireless signal through the antenna adjustment device, the antenna adjustment device comprising: at least one variable impedance unit, coupled to the at least one antenna; and a micro-controller unit, coupled to the at least one variable impedance unit, for performing the following steps: sending a request signal to the user equipment; receiving a plurality of signal quality parameters responded by the user equipment according to the request signal, wherein the plurality of signal quality parameters are related to the wireless signal; and adjusting a current impedance value of the at least one variable impedance unit according to the plurality of signal quality parameters. ## Claims ### Claim 1 An antenna adjustment device, for a user equipment, wherein the user equipment is coupled to at least one external antenna to receive or transmit a wireless signal through the antenna adjustment device, the antenna adjustment device comprising: at least one variable impedance unit, coupled to the at least one external antenna; a micro-controller unit, coupled to the at least one variable impedance unit, for performing the following steps: sending a request signal to the user equipment; receiving a plurality of signal quality parameters responded by the user equipment according to the request signal, wherein the plurality of signal quality parameters are related to the wireless signal; and adjusting a current impedance value of the at least one variable impedance unit according to the plurality of signal quality parameters; and a storage unit, stores a lookup table, wherein the lookup table comprises a plurality of optimized impedance values and a plurality of sets of default signal quality parameters corresponding to a plurality of band; wherein the micro-controller unit adjusts the current impedance value of the at least one variable impedance unit according to the plurality of signal quality parameters and the lookup table; wherein the step of adjusting the current impedance value of the at least one variable impedance unit according to the plurality of signal quality parameters and the lookup table comprises: receiving a current band corresponding to the plurality of signal quality parameters responded to by the user equipment according to the request signal; querying a set of default signal quality parameters corresponding to the current band among the plurality of optimized impedance values in the lookup table; comparing the plurality of signal quality parameters and the set of default signal quality parameters; maintaining the at least one variable impedance unit when the plurality of signal quality parameters are better or the same as the set of default signal quality parameters; and adjusting the at least one variable impedance unit to an optimized impedance value corresponding to the current band among the plurality of optimized impedance values when the plurality of signal quality parameters are not better than the set of default signal quality parameters. ### Claim 2 (depends on 1) The antenna adjustment device of claim 1, wherein the plurality of signal quality parameters and the set of default signal quality parameters comprise at least one of a transmission power, a reception power, a channel quality indicator (CQI), a received signal strength indication (RSSI) and a reference signal received power (RSRP). ### Claim 3 An antenna adjustment method, for an antenna adjustment device, wherein a user equipment is coupled to at least one external antenna to receive or transmit a wireless signal through the antenna adjustment device, the antenna adjustment method comprising: sending, by a micro-controller unit of the antenna adjustment device, a request signal to the user equipment; receiving, by the micro-controller unit, a plurality of signal quality parameters responded by the user equipment according to the request signal, wherein the plurality of signal quality parameters are related to the wireless signal; and adjusting, by the micro-controller unit, a current impedance value of the at least one variable impedance unit according to the plurality of signal quality parameters; wherein the antenna adjustment device stores a lookup table, the lookup table comprises a plurality of optimized impedance values and a plurality of sets of default signal quality parameters corresponding to a plurality of band; wherein the step of adjusting the current impedance value of the at least one variable impedance unit according to the plurality of signal quality parameters is adjusting the current impedance value of the at least one variable impedance unit according to the plurality of signal quality parameters and the lookup table; wherein the step of adjusting the current impedance value of the at least one variable impedance unit according to the plurality of signal quality parameters and the lookup table comprises: receiving a current band corresponding to the plurality of signal quality parameters responded to by the user equipment according to the request signal; querying a set of default signal quality parameters corresponding to the current band among the plurality of optimized impedance values in the lookup table; comparing the plurality of signal quality parameters and the set of default signal quality parameters; maintaining the at least one variable impedance unit when the plurality of signal quality parameters are better or the same as the set of default signal quality parameters; and adjusting the at least one variable impedance unit to an optimized impedance value corresponding to the current band among the plurality of optimized impedance values when the plurality of signal quality parameters are not better than the set of default signal quality parameters. ### Claim 4 (depends on 3) The antenna adjustment device of claim 3, wherein the plurality of signal quality parameters and the set of default signal quality parameters comprise at least one of a transmission power, a reception power, a channel quality indicator (CQI), a received signal strength indication (RSSI) and a reference signal received power (RSRP). ### Claim 5 A communication system, comprising: at least one antenna; a user equipment; an antenna adjustment device, coupled to the at least one antenna and the user equipment, wherein the user equipment is coupled to the antenna through the antenna adjustment device to transmit or receive a wireless signal, wherein the antenna adjustment device comprises: at least one variable impedance unit, coupled to the at least one antenna; and a micro-controller unit, coupled to the at least one variable impedance unit, for performing the following steps: sending a request signal to the user equipment; receiving a plurality of signal quality parameters responded by the user equipment according to the request signal, wherein the plurality of signal quality parameters are related to the wireless signal; adjusting a current impedance value of the at least one variable impedance unit according to the plurality of signal quality parameters; and a storage unit, stores a lookup table, wherein the lookup table comprises a plurality of optimized impedance values and a plurality of sets of default signal quality parameters corresponding to a plurality of band; wherein the micro-controller unit adjusts the current impedance value of the at least one variable impedance unit according to the plurality of signal quality parameters and the lookup table; wherein the step of adjusting the current impedance value of the at least one variable impedance unit according to the plurality of signal quality parameters and the lookup table comprises: receiving a current band corresponding to the plurality of signal quality parameters responded to by the user equipment according to the request signal; querying a set of default signal quality parameters corresponding to the current band among the plurality of optimized impedance values in the lookup table; comparing the plurality of signal quality parameters and the set of default signal quality parameters; maintaining the at least one variable impedance unit when the plurality of signal quality parameters are better or the same as the set of default signal quality parameters; and adjusting the at least one variable impedance unit to an optimized impedance value corresponding to the current band among the plurality of optimized impedance values when the plurality of signal quality parameters are not better than the set of default signal quality parameters. ### Claim 6 (depends on 5) The communication system of claim 5, wherein the plurality of signal quality parameters and the set of default signal quality parameters comprise at least one of a transmission power, a reception power, a channel quality indicator (CQI), a received signal strength indication (RSSI) and a reference signal received power (RSRP).