# US 2019/0246295 A1 · Detection device and detection method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0246295 A1 - Document ID: US20190246295A1 - Status: Published application - Kind: A1 - Application number: 15/887,911 - Filed: 2018-02-02 - Published: 2019-08-08 - Earliest claimed: 2018-02-02 - Assignees: Wistron Neweb Corp. - Applicants: Wistron NeWeb Corp. - Inventors: Huai-Ming CHANG; Horen CHEN; Tsun-Che HUANG - Web page: https://patentgrep.com/patent/US20190246295A1 ## CPC - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 8/005: {Discovery of network devices, e.g. terminals} - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A detection device for communicating with an external device includes a smart antenna, a storage device, and a processor. The smart antenna is capable of switching between a plurality of antenna modes. In each of the antenna modes, the smart antenna transmits a test datum and receives a feedback datum according to the test datum, the processor performs a time reversal algorithm to the feedback datum so as to obtain a time reversal datum, the processor calculates an indicator according to the feedback datum and the time reversal datum, and the storage device stores the feedback datum, the time reversal datum, and the indicator. The processor compares all of the indicators with each other and controls the smart antenna to select the final mode of the antenna modes according to a comparison between all of the indicators. ## Claims ### Claim 1 A detection device for communicating with an external device, comprising: a smart antenna, wherein the smart antenna is capable of switching between a plurality of antenna modes; a storage device; and a processor; wherein in each of the antenna modes, the smart antenna transmits a test datum and receives a feedback datum according to the test datum, the processor performs a time reversal algorithm to the feedback datum so as to obtain a time reversal datum, the processor calculates an indicator according to the feedback datum and the time reversal datum, and the storage device stores the feedback datum, the time reversal datum, and the indicator; wherein the processor compares all of the indicators with each other and controls the smart antenna to select a final mode of the antenna modes according to a comparison between all of the indicators; wherein the final mode corresponds to an average of all of the indicators or a minimum of all of the indicators. ### Claim 2 (depends on 1) The detection device as claimed in claim 1, wherein the detection device is configured to determine whether a surrounding environment changes. ### Claim 3 (depends on 1) The detection device as claimed in claim 1, wherein the antenna modes comprise different radiation patterns of the smart antenna. ### Claim 4 (depends on 1) The detection device as claimed in claim 1, wherein the antenna modes comprise different polarization directions of the smart antenna. ### Claim 5 (depends on 1) The detection device as claimed in claim 1, wherein the feedback datum comprises a reference channel impulse response and an instant channel impulse response which are obtained at different times. ### Claim 6 (depends on 5) The detection device as claimed in claim 5, wherein the time reversal datum comprises a time reversal channel impulse response relative to the instant channel impulse response. ### Claim 7 (depends on 6) The detection device as claimed in claim 6, wherein the indicator comprises a resonant strength based on the reference channel impulse response and the time reversal channel impulse response. ### Claim 8 (depends on 6) The detection device as claimed in claim 6, wherein the indicator comprises a correlation coefficient based on the reference channel impulse response and the time reversal channel impulse response. ### Claim 9 (canceled). ### Claim 10 (canceled). ### Claim 11 A detection method using a detection device for communicating with an external device, the detection device comprising a smart antenna which is capable of switching between a plurality of antenna modes, and the detection method comprising the steps of: in each of the antenna modes, transmitting a test datum and receiving a feedback datum according to the test datum, performing a time reversal algorithm to the feedback datum so as to obtain a time reversal datum, and calculating an indicator according to the feedback datum and the time reversal datum; and comparing all of the indicators with each other, and controlling the smart antenna to select a final mode of the antenna modes according to a comparison between all of the indicators; wherein the final mode corresponds to an average of all of the indicators or a minimum of all of the indicators. ### Claim 12 (depends on 11) The detection method as claimed in claim 11, further comprising: using the detection device to determine whether a surrounding environment changes. ### Claim 13 (depends on 11) The detection method as claimed in claim 11, wherein the antenna modes comprise different radiation patterns of the smart antenna. ### Claim 14 (depends on 11) The detection method as claimed in claim 11, wherein the antenna modes comprise different polarization directions of the smart antenna. ### Claim 15 (depends on 11) The detection method as claimed in claim 11, wherein the feedback datum comprises a reference channel impulse response and an instant channel impulse response which are obtained at different times. ### Claim 16 (depends on 15) The detection method as claimed in claim 15, wherein the time reversal datum comprises a time reversal channel impulse response relative to the instant channel impulse response. ### Claim 17 (depends on 16) The detection method as claimed in claim 16, wherein the indicator comprises a resonant strength based on the reference channel impulse response and the time reversal channel impulse response. ### Claim 18 (depends on 16) The detection method as claimed in claim 16, wherein the indicator comprises a correlation coefficient based on the reference channel impulse response and the time reversal channel impulse response. ### Claim 19 (canceled). ### Claim 20 (canceled).