# US 12,183,979 B2 · Radiofrequency planar antenna with circular polarisation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,183,979 B2 - Document ID: US12183979B2 - Status: Granted - Kind: B2 - Application number: 18/067,849 - Filed: 2022-12-19 - Published: 2023-06-22 - Granted: 2024-12-31 - Earliest claimed: 2021-12-21 - Assignees: Commissariat A L'energie Atomique Et Aux Energies Alternatives - Applicants: Commissariat à l'énergie atomique et aux énergies alternatives - Inventors: Lionel Rudant; Lotfi Batel; Christophe Delaveaud - Web page: https://patentgrep.com/patent/US12183979B2 ## CPC - H01Q 5/49: with parasitic elements used for purposes other than for dual-band or multi-band, e.g. imbricated Yagi antennas - H01Q 21/062: {using dipole aerials; (H01Q21/067, H01Q21/068 take precedence)} - H01Q 1/247: {with frequency mixer, e.g. for direct satellite reception or Doppler radar} - H01Q 5/42: using two or more imbricated arrays (H01Q5/49 takes precedence) - H01Q 9/065: {Microstrip dipole antennas (patch antenna H01Q9/0407)} - H01Q 9/16: with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole (H01Q9/44 takes precedence) - H01Q 21/24: Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction {(circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001)} - H01Q 21/26: Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract The present invention relates to a radio frequency antenna (10) including an antenna array (12) operating at one wavelength and comprising: a powered dipole (14A) connected at an access point (15) to a radio frequency transmitter generating or receiving a wave at the wavelength, at least one coupled dipole (14C1, 14C2, 14C3) connected at an access point to a respective load (Z1, Z2, Z3), the powered dipole (14A) and each coupled dipole (14C1, 14C2, 14C3) including two strands extending from the access point (15), the access points (15) being arranged so as to form a polygon, the first strand of a dipole (14) extending along the second strand of a neighboring dipole (14) at a distance less than one tenth of the wavelength. ## Claims ### Claim 1 A radio frequency antenna including at least one antenna array operating at an operating frequency, each antenna array comprising: a powered dipole, the powered dipole being connected at an access point to a radio frequency transmitter adapted to generate or receive a wave at the operating frequency, at least one coupled dipole, each coupled dipole being connected in an access point to a respective load which is resistive and/or capacitive and/or inductive, the powered dipole and each coupled dipole having two strands, the strands extending from the access point, the access points being arranged to form a polygon, a direction being defined for each strand, the powered dipole and each coupled dipole being arranged so that each direction of one strand intersects a direction of another strand, the first strand of a dipole extending along the second strand of a neighboring dipole on said polygon at a distance less than or equal to one tenth of the wavelength corresponding to the operating frequency, said wavelength being called operating length. ### Claim 2 (depends on 1) The radio frequency antenna according to claim 1, wherein the two strands have a length less than or equal to a quarter of the operating wavelength. ### Claim 3 (depends on 1) The radio frequency antenna according to claim 1, wherein the first strand of a dipole extends along the second strand of a neighboring dipole on said polygon at a distance less than or equal to one twentieth of the operating wavelength. ### Claim 4 (depends on 1) The radio frequency antenna according to claim 1, wherein the directions of the two strands of the same dipole have an angle therebetween equal to 90° within plus or minus 10%. ### Claim 5 (depends on 1) The radio frequency antenna according to claim 1, wherein the polygon is a regular polygon. ### Claim 6 (depends on 1) The radio frequency antenna according to claim 1, wherein the number of coupled dipoles of an antenna array is between 2 and 4. ### Claim 7 (depends on 1) The radio frequency antenna according to claim 1, wherein the radio frequency antenna includes first and second antenna arrays, the polygon formed by the access points of the second antenna array being included in the internal space delimited by the polygon formed by the access points of the first antenna array, each antenna array operating at a respective operating frequency. ### Claim 8 (depends on 1) A radio frequency antenna according to claim 1, wherein the radio frequency antenna has a reflector plane located at a distance less than or equal to one quarter of the operating wavelength. ### Claim 9 (depends on 1) A radio frequency antenna according to claim 1, wherein the strands have meanders or folds. ### Claim 10 (depends on 1) A radio frequency antenna according to claim 1, wherein the loads of the coupled dipoles are chosen so that: the radiation from the radio frequency antenna has a right circular polarization with a maximum gain along the direction perpendicular to the radio frequency antenna, the radiation from the radio frequency antenna has a uniform right circular polarization for an elevation aperture between 90° and −90° around the direction perpendicular to the radio frequency antenna, and the gain of the cross polarization is minimized. ### Claim 11 (depends on 1) A system including at least one radio frequency antenna according to claim 1. ### Claim 12 (depends on 11) A system according to claim 11, where the system is a satellite positioning system.