# US 2018/0323488 A1 · PCB Integrated Waveguide Terminations and Load > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0323488 A1 - Document ID: US20180323488A1 - Status: Published application - Kind: A1 - Application number: 16/015,102 - Filed: 2018-06-21 - Published: 2018-11-08 - Earliest claimed: 2015-08-05 - Assignees: Waymo LLC - Applicants: Waymo LLC - Inventors: Jamal Izadian; Adam Brown - Web page: https://patentgrep.com/patent/US20180323488A1 ## CPC - H01P 5/12: Coupling devices having more than two ports (H01P5/04 takes precedence) - G01S 7/02: of systems according to group G01S13/00 - G01S 7/032: {Constructional details for solid-state radar subsystems} - H01P 1/222: {Waveguide attenuators (H01P1/23 takes precedence)} - H01P 5/107: Hollow-waveguide/strip-line transitions - H01Q 3/40: with phasing matrix - H01Q 21/0037: {linear waveguide fed arrays} - H01Q 21/062: {using dipole aerials; (H01Q21/067, H01Q21/068 take precedence)} - H01Q 21/08: the units being spaced along or adjacent to a rectilinear path {(waveguide fed H01Q21/0037)} - G01S 13/931: of land vehicles - H01Q 17/00: Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems - H01Q 21/005: {Slotted waveguides arrays} - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) - 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 The present application discloses embodiments that relate to a radar system. The embodiments may include a plurality of radiating waveguides each having a waveguide input. The embodiments also include an attenuation component, which can be located on a circuit board. The embodiments further include a beamforming network. The beamforming network includes a beamforming network input. The beamforming network also includes a plurality of beamforming network outputs, where each beamforming network output is coupled to one of the waveguide inputs. Additionally, the beamforming network includes an attenuation port, wherein the attenuation port is configured to couple the beamforming network to the attenuation component. The attenuation component dissipates received electromagnetic energy. ## Claims ### Claim 1 A radar system comprising: a plurality of radiating waveguides each having a waveguide input, and wherein each radiating waveguide comprises at least one radiating element; at least one attenuation component, wherein the at least one attenuation component is disposed on a circuit board and wherein the attenuation component is configured to dissipate electromagnetic energy; at least one attenuation port, wherein the at least one attenuation port is configured to couple the beamforming network to the at least one attenuation component; and a beamforming network, and wherein the beamforming network comprises: a beamforming network input, and a plurality of beamforming network outputs, wherein each beamforming network output is coupled to one of the waveguide inputs. ### Claim 2 (depends on 1) The radar system according to claim 1, wherein the at least one attenuation port comprises a plurality of attenuation ports and wherein the at least one attenuation component comprises a plurality of attenuation components, wherein each attenuation port is coupled to a respective attenuation component. ### Claim 3 (depends on 1) The radar system according to claim 1, wherein the attenuation component comprises a patch on the circuit board. ### Claim 4 (depends on 3) The radar system according to claim 3, wherein the patch comprises a surface configured to absorb electromagnetic energy. ### Claim 5 (depends on 1) The radar system according to claim 1, wherein the attenuation port is perpendicular to the plane of the waveguides. ### Claim 6 (depends on 1) The radar system according to claim 1, wherein the attenuation component comprises at least one microstrip line on the circuit board. ### Claim 7 (depends on 1) The radar system according to claim 1, wherein the attenuation component comprises conductive ink printed on the circuit board. ### Claim 8 A method comprising: receiving electromagnetic energy by a waveguide; radiating at least a portion of the electromagnetic energy by radiating components of the waveguide, wherein a portion of the electromagnetic energy that is not radiated is reflected as reflected electromagnetic energy; coupling at least a portion of the reflected electromagnetic energy to an attenuation port; coupling at least a portion of the reflected electromagnetic energy to an attenuation component, wherein the attenuation component is disposed on a circuit board; and dissipating the portion of the reflected electromagnetic energy coupled to the attenuation component by the attenuation component. ### Claim 9 (depends on 8) The method according to claim 8, wherein the waveguide comprises a plurality of attenuation ports, wherein each attenuation port is coupled to a respective attenuation component in a plurality of attenuation components. ### Claim 10 (depends on 8) The method according to claim 8, wherein the attenuation component comprises a patch on the circuit board, wherein the method further comprises coupling the portion of the reflected electromagnetic energy by the patch. ### Claim 11 (depends on 8) The method according to claim 8, further comprising absorbing the portion of the reflected electromagnetic energy by a surface of the patch. ### Claim 12 (depends on 8) The method according to claim 8, wherein the attenuation component comprises at least one microstrip line on the circuit board. ### Claim 13 (depends on 8) The method according to claim 8, wherein the attenuation component comprises conductive ink printed on the circuit board. ### Claim 14 A waveguide system comprising: a waveguide feed configured to receive electromagnetic energy; a beamforming network comprising a plurality of waveguides coupled to the waveguide feed, wherein the beamforming network: has a plurality of elongated segments, and is configured to divide the electromagnetic energy into a plurality of portions of electromagnetic energy; and a plurality of radiating waveguides located in the plane, wherein each radiating waveguide comprises at least one radiating element, wherein each radiating waveguide receives one of the portions of electromagnetic energy and wherein the radiating element is configured to: radiate at least a portion of the received portion of electromagnetic energy, and reflect the portion of the received portion of electromagnetic energy that is not radiated; at least one attenuation port coupled to at least one of the waveguides and configured to couple the reflected portion of the received portion of electromagnetic energy; and a respective attenuation component coupled to each attenuation port and configured to attenuate the reflected portion of the received portion of electromagnetic energy, wherein the attenuation component is disposed on a circuit board. ### Claim 15 (depends on 14) The waveguide system according to claim 14, wherein the beamforming network is configured to divide the electromagnetic energy based on a taper profile. ### Claim 16 (depends on 14) The waveguide system according to claim 14, wherein the attenuation component comprises a patch on the circuit board. ### Claim 17 (depends on 16) The waveguide system according to claim 16, wherein the patch comprises a surface configured to absorb electromagnetic energy. ### Claim 18 (depends on 14) The waveguide system according to claim 14, wherein the attenuation port is perpendicular to the plane of the waveguides. ### Claim 19 (depends on 14) The waveguide system according to claim 14, wherein the attenuation component comprises at least one microstrip line on the circuit board. ### Claim 20 (depends on 14) The waveguide system according to claim 14, wherein the attenuation component comprises conductive ink printed on the circuit board.