# US 2014/0152491 A1 · Electronic device and method for sensing active state of object > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152491 A1 - Document ID: US20140152491A1 - Status: Published application - Kind: A1 - Application number: 13/743,319 - Filed: 2013-01-16 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Industrial Technology Research Institute - Applicants: Industrial Technology Research Institute - Inventors: Yen-Hsien Lee; Wen-Jen Tseng; Hong-Dun Lin - Web page: https://patentgrep.com/patent/US20140152491A1 ## CPC - G01S 13/106: {using transmission of pulses having some particular characteristics (G01S13/12, G01S13/22, G01S13/24, G01S13/26, G01S13/28 and G01S13/30 take precedence)} - G01S 7/03: Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver - G01S 13/58: Velocity or trajectory determination systems; Sense-of-movement determination systems - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES ## Abstract An electronic device and a method for sensing an active state of an object are provided; the electronic device includes a signal generating module, a non-symmetric antenna module and a signal analyzing module. The signal generating module is configured to generate a pulse width modulation signal, generate a measuring signal with overshoot and undershoot pulses according to the pulse width modulation signal, and generate a reference signal according to the measuring signal. The non-symmetric antenna module includes a transmitting antenna and a receiving antenna. The transmitting antenna is configured to transmit the measuring signal to an object. The receiving antenna is configured to receive the measuring signal reflected by the object. The signal analyzing module is configured to receive and process the reference signal and the measuring signal reflected by the object, so as to obtain an object active state signal. ## Claims ### Claim 1 An electronic device, comprising: a signal generating module configured to generate a pulse width modulation signal, generate a measuring signal with overshoot and undershoot pulses according to the pulse width modulation signal, and generate a reference signal according to the measuring signal; a non-symmetric antenna module, comprising: a transmitting antenna coupled to the signal generating module and configured to transmit the measuring signal to an object; and a receiving antenna configured to receive the measuring signal reflected by the object; and a signal analyzing module coupled to the signal generating module and the receiving antenna of the non-symmetric antenna module and configured to receive and process the reference signal and the measuring signal reflected by the object to obtain an object active state signal. ### Claim 2 (depends on 1) The electronic device according to claim 1, wherein the signal generating module comprises: a pulse width modulation circuit configured to generate a pulse width modulation signal according to a clock signal; an overshoot and undershoot wave generating circuit coupled to the pulse width modulation circuit and the transmitting antenna of the non-symmetric antenna module and configured to modulate the pulse width modulation signal to be the measuring signal with the overshoot and undershoot pulses by means of digital signal processing; and a delay circuit coupled to the overshoot and undershoot wave generating circuit and the signal analyzing module and configured to generate the reference signal according to the measuring signal. ### Claim 3 (depends on 2) The electronic device according to claim 2, wherein the overshoot and undershoot wave generating circuit comprises a NAND gate. ### Claim 4 (depends on 2) The electronic device according to claim 2, wherein the overshoot and undershoot wave generating circuit comprises an AND gate. ### Claim 5 (depends on 2) The electronic device according to claim 2, wherein the signal analyzing module comprises: a mixer circuit coupled to the receiving antenna of the non-symmetric antenna module and the delay circuit and configured to mix the measuring signal reflected by the object and the reference signal to be a mixing signal; a signal amplifying circuit coupled to the mixer circuit and configured to amplify the mixing signal to be an amplified mixing signal; a band pass filtering circuit coupled to the signal amplifying circuit and configured to perform a filtering operation on the amplified mixing signal to generate a filtered signal; and a sampling circuit coupled to the band pass filtering circuit and configured to perform a sampling operation on the filtered signal to obtain the object active state signal. ### Claim 6 (depends on 1) The electronic device according to claim 1, wherein the transmitting antenna and the receiving antenna of the non-symmetric antenna module respectively have a comb-shaped structure. ### Claim 7 A method for sensing an active state of an object, comprising: generating a measuring signal with overshoot and undershoot pulses and generating a reference signal according to the measuring signal; transmitting the measuring signal to an object by a transmitting antenna of a non-symmetric antenna module; receiving the measuring signal reflected by the object by a receiving antenna of the non-symmetric antenna module; and receiving and processing the reference signal and the measuring signal reflected by the object to obtain an object active state signal. ### Claim 8 (depends on 7) The method for sensing the active state of the object according to claim 7, wherein the step of generating the measuring signal with the overshoot and undershoot pulses comprises: generating a pulse width modulation signal and modulating the pulse width modulation signal to be the measuring signal with the overshoot and undershoot pulses by means of digital signal processing. ### Claim 9 (depends on 7) The method for sensing the active state of the object according to claim 7, wherein the step of processing the reference signal and the measuring signal reflected by the object to obtain the object active state signal comprises: mixing the reference signal and the measuring signal reflected by the object to be a mixing signal, wherein the reference signal is generated by delaying the measuring signal; amplifying the mixing signal to be an amplified mixing signal; performing a filtering operation on the amplified mixing signal to generate a filtered signal; and performing a sampling operation on the filtered signal to obtain the object active state signal.