# US 2020/0403307 A1 · Radar sensor with radome having trenches for reducing coupling between transmit and receive antennas > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0403307 A1 - Document ID: US20200403307A1 - Status: Published application - Kind: A1 - Application number: 16/448,302 - Filed: 2019-06-21 - Published: 2020-12-24 - Earliest claimed: 2019-06-21 - Assignees: Veoneer US, Inc. - Applicants: Veoneer US, Inc. - Inventors: Majid Ahmadloo - Web page: https://patentgrep.com/patent/US20200403307A1 ## CPC - G01S 7/032: {Constructional details for solid-state radar subsystems} - H01Q 1/525: {between emitting and receiving antennas} - G01S 7/038: {Feedthrough nulling circuits} - G01S 13/931: of land vehicles - H01Q 1/3233: {particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems} - H01Q 1/38: formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142)} - H01Q 1/42: Housings not intimately mechanically associated with radiating elements, e.g. radome - H01Q 1/421: {Means for correcting aberrations introduced by a radome} - H01Q 21/065: {Patch antenna array} - G01S 7/027: {Constructional details of housings, e.g. form, type, material or ruggedness} - 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 - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract A radar sensor module includes a substrate, at least one transmit antenna formed on a surface of the substrate, and at least one receive antenna formed on the surface of the substrate. A radome is disposed over the surface of the substrate and the at least one transmit antenna and the at least one receive antenna, such that a gap is located between the surface of the substrate and an underside of the radome in which a portion of radiation emitted from the at least one transmit antenna can propagate. At least one trench is formed in the underside of the radome and is electromagnetically coupled to the gap, the at least one trench being sized, shaped and positioned with respect to the gap such that the portion of radiation emitted from the at least one transmit antenna is substantially prevented from propagating toward the receiving antenna. ## Claims ### Claim 1 A radar sensor module, comprising: a substrate; at least one transmit antenna formed on a surface of the substrate; at least one receive antenna formed on the surface of the substrate; a radome over the surface of the substrate and the at least one transmit antenna and the at least one receive antenna, such that a gap is disposed between the surface of the substrate and an underside of the radome in which a portion of radiation emitted from the at least one transmit antenna can propagate; and at least one trench formed in the underside of the radome and electromagnetically coupled to the gap, the at least one trench being sized, shaped and positioned with respect to the gap such that the portion of radiation emitted from the at least one transmit antenna is substantially prevented from propagating toward the receiving antenna. ### Claim 2 (depends on 1) The radar sensor module of claim 1, wherein the substrate is a printed circuit board (PCB). ### Claim 3 (depends on 1) The radar sensor module of claim 1, wherein the at least one transmit antenna and the at least one receive antenna are antenna patch arrays formed on the surface of the substrate. ### Claim 4 (depends on 1) The radar sensor module of claim 1, wherein the trench is sized, shaped and positioned to act as a waveguide stub electromagnetically coupled to the gap, such that the trench is configured as an electromagnetic stop. ### Claim 5 (depends on 1) The radar sensor module of claim 1, wherein the trench is sized, shaped and positioned to act as a waveguide stub electromagnetically coupled to the gap, such that the trench is configured as an electromagnetic stop at an operating frequency of the radar sensor module. ### Claim 6 (depends on 5) The radar sensor module of claim 5, wherein the operating frequency of the radar sensor module is in the range of 76 GHz to 77 GHz. ### Claim 7 (depends on 6) The radar sensor module of claim 6, wherein the trench has a width of approximately 1 mm and a depth of approximately 1.8 mm. ### Claim 8 (depends on 6) The radar sensor module of claim 6, wherein the gap has a height of approximately 1 mm. ### Claim 9 (depends on 6) The radar sensor module of claim 6, wherein the radome has a thickness of approximately 2.5 mm. ### Claim 10 (depends on 5) The radar sensor module of claim 5, wherein the operating frequency of the radar sensor module is in the range of 76 GHz to 78 GHz. ### Claim 11 (depends on 10) The radar sensor module of claim 10, wherein the trench has a width of approximately 1 mm and a depth of approximately 1.8 mm. ### Claim 12 (depends on 10) The radar sensor module of claim 10, wherein the gap has a height of approximately 1 mm. ### Claim 13 (depends on 10) The radar sensor module of claim 10, wherein the radome has a thickness of approximately 2.5 mm. ### Claim 14 (depends on 1) The radar sensor module of claim 1, wherein the trench is positioned vertically over the surface of the substrate and laterally between the at least one transmit antenna and the at least one receive antenna. ### Claim 15 (depends on 1) The radar sensor module of claim 1, further comprising a second transmit antenna formed on the surface of the substrate immediately adjacent to the at least one transmit antenna. ### Claim 16 (depends on 15) The radar sensor module of claim 15, further comprising a second receive antenna formed on the surface of the substrate adjacent to the at least one receive antenna. ### Claim 17 (depends on 16) The radar sensor module of claim 16, wherein: the first and second transmit antennas form a group of transmit antennas and the first and second receive antennas form a group of receive antennas; and the trench is positioned vertically over the surface of the substrate and laterally between the group of transmit antennas and the group of receive antennas. ### Claim 18 (depends on 1) The radar sensor module of claim 1, wherein the radar sensor module is an automotive radar sensor module.