# US 11,112,486 B2 · Radar apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,112,486 B2 - Document ID: US11112486B2 - Status: Granted - Kind: B2 - Application number: 16/450,444 - Filed: 2019-06-24 - Published: 2019-10-17 - Granted: 2021-09-07 - Earliest claimed: 2016-12-27 - Assignees: Socionext Inc. - Applicants: Socionext Inc. - Inventors: Joji Hayashi - Web page: https://patentgrep.com/patent/US11112486B2 ## CPC - G01S 7/028: {Miniaturisation, e.g. surface mounted device [SMD] packaging or housings} - G01S 7/032: {Constructional details for solid-state radar subsystems} - G01S 7/038: {Feedthrough nulling circuits} - G01S 7/352: {Receivers} - G01S 7/354: {Extracting wanted echo-signals (Doppler systems G01S13/50)} - G01S 7/4021: {of receivers} - G01S 13/34: using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal - H04B 1/408: the transmitter oscillator frequency being identical to the receiver local oscillator frequency - G01S 7/358: {using I/Q processing} - 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 - H04B: TRANSMISSION ## Abstract Disclosed is a radar apparatus including: a local oscillator for outputting a local oscillation signal; a transmitter unit; and a receiver unit. The transmitter unit includes: a transmission input configured to receive the local oscillation signal; and a transmitter configured to transmit a transmission signal based on the local oscillation signal that has been received via the transmission input. The receiver unit includes: a reception input configured to receive the local oscillation signal not via the transmission input; a receiver configured to receive a reflection wave based on the transmission signal; a cancel signal generator configured to generate a cancel signal based on the local oscillation signal that has been received via the reception input; and an adder configured to superimpose the cancel signal on a reception signal. ## Claims ### Claim 1 A radar apparatus which includes: a local oscillator for outputting a local oscillation signal; a transmitter unit; and a receiver unit, wherein the transmitter unit includes: a transmission input configured to receive the local oscillation signal; and a transmitter configured to transmit a transmission signal based on the local oscillation signal that has been received via the transmission input, the receiver unit includes: a reception input configured to receive the local oscillation signal not via the transmission input; a receiver configured to receive a reflection wave based on the transmission signal; an IQ generation circuit which receives the local oscillation signal as an input, the IQ generation circuit configured to generate first and second local oscillation signals having a phase difference of 90 degrees; a cancel signal generator configured to generate a cancel signal by amplifying the first and second local oscillation signals based on an adjustment signal and then adding the amplified first and second local oscillation signals; an adder configured to perform superimposition of the cancel signal on a reception signal; and: a mixer configured to perform frequency conversion using the first and second local oscillation signals by receiving an output from the adder. ### Claim 2 (depends on 1) The radar apparatus of claim 1, wherein the cancel signal includes a plurality of cancel signals, and the cancel signal generator adjusts an amplitude of each of cancel signals I and Q among the cancel signals, the cancel signal I being based on the first local oscillation signal, the cancel signal Q having a phase difference of 90 degrees from the cancel signal I and being based on the second local oscillation signal. ### Claim 3 (depends on 1) The radar apparatus of claim 1, wherein a frequency of the local oscillation signal is modulated. ### Claim 4 (depends on 3) The radar apparatus of claim 3, wherein the cancel signal generator adjusts the cancel signal in accordance with frequency information of the local oscillation signal. ### Claim 5 (depends on 1) The radar apparatus of claim 1, wherein the receiver includes a low noise amplifier, and the adder performs the superimposition in a preceding stage of the low noise amplifier. ### Claim 6 (depends on 1) The radar apparatus of claim 1, further comprising: at least one transmitter circuit having a same configuration as the transmitter unit; and a plurality of receiver circuits each having a same configuration as the receiver unit. ### Claim 7 (depends on 6) The radar apparatus of claim 6, wherein all circuits are formed in one package. ### Claim 8 (depends on 7) The radar apparatus of claim 7, wherein the plurality of receiver circuits have reception antennas, and the reception antennas are planar antennas arranged on a package substrate. ### Claim 9 A radar apparatus which includes: a local oscillator for outputting a local oscillation signal; at least one transmitter circuit; and a plurality of receiver circuits, wherein the at least one transmitter circuit includes: a transmission input configured to receive the local oscillation signal; and a transmitter configured to transmit a transmission signal based on the local oscillation signal that has been received via the transmission input, each of the receiver circuits includes: a reception input configured to receive the local oscillation signal not via the transmission input; a receiver configured to receive a reflection wave based on one of the transmission signals; an IQ generation circuit which receives the local oscillation signal as an input, the IQ generation circuit configured to generate first and second local oscillation signals having a phase difference of 90 degrees a cancel signal generator configured to generate a cancel signal by amplifying the first and second local oscillation signals based on an adjustment signal and then adding the amplified first and second local oscillation signals; an adder configured to perform superimposition of the cancel signal on a reception signal; and a mixer configured to perform frequency conversion using the first and second local oscillation signals by receiving an output from the adder. ### Claim 10 (depends on 9) The radar apparatus of claim 9, wherein the cancel signal includes a plurality of cancel signals, and the cancel signal generator adjusts an amplitude of each of cancel signals I and Q among the cancel signals, the cancel signal I being based on the first local oscillation signal, the cancel signal Q having a phase difference of 90 degrees from the cancel signal I and being based on the second local oscillation signal. ### Claim 11 (depends on 9) The radar apparatus of claim 9, wherein a frequency of the local oscillation signal is modulated. ### Claim 12 (depends on 11) The radar apparatus of claim 11, wherein the cancel signal generator adjusts the cancel signal in accordance with frequency information of the local oscillation signal. ### Claim 13 (depends on 9) The radar apparatus of claim 9, wherein the receiver includes a low noise amplifier, and the adder performs the superimposition in a preceding stage of the low noise amplifier. ### Claim 14 (depends on 9) The radar apparatus of claim 9, wherein all circuits are formed in one package. ### Claim 15 (depends on 14) The radar apparatus of claim 14, wherein the plurality of receiver circuits have reception antennas, and the reception antennas are planar antennas arranged on a package substrate.