# US 2017/0288291 A1 · Horn antenna > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0288291 A1 - Document ID: US20170288291A1 - Status: Published application - Kind: A1 - Application number: 15/511,435 - Filed: 2016-05-31 - Published: 2017-10-05 - Earliest claimed: 2015-06-03 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Shinji ARAI; Tomohiro TAKAHASHI - Web page: https://patentgrep.com/patent/US20170288291A1 ## CPC - H01Q 13/02: Waveguide horns - H01P 5/12: Coupling devices having more than two ports (H01P5/04 takes precedence) - H01P 11/006: {Manufacturing dielectric waveguides} - H01Q 1/28: Adaptation for use in or on aircraft, missiles, satellites, or balloons - H01Q 13/0233: {Horns fed by a slotted waveguide array (biconical horns H01Q13/06)} - H01Q 13/06: Waveguide mouths (horns H01Q13/02) - H01Q 15/10: comprising three-dimensional [3D] array of impedance discontinuities, e.g. holes in conductive surfaces or conductive discs forming artificial dielectric - H01Q 15/24: Polarising devices; Polarisation filters (H01Q15/12, H01Q15/22 take precedence) - H01Q 21/0043: {Slotted waveguides (combination with horns H01Q13/0233)} - H01Q 21/0075: {Stripline fed arrays (H01Q21/065 takes precedence)} - H01Q 21/06: Arrays of individually energised antenna units similarly polarised and spaced apart - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) ## Abstract Lower-limit frequency reflection characteristics of a horn antenna are improved even though element spacing, of less than or equal to one wavelength, is a spacing at which grating lobes do not occur in an antenna radiation pattern. The horn antenna includes a horn antenna and a conductor grid that divides an aperture A of the horn antenna in a grid pattern and that electrically connects to an inner surface of the horn antenna at the aperture A of the horn antenna. Width of the conductor grid in a direction orthogonal to a horn antenna aperture plane differs from electrical length of the path of the horn antenna of the conductor grid portion at the frequency of power supplied to the horn antenna. ## Claims ### Claim 1 A horn antenna comprising: a horn antenna; and a conductor grid to divide an aperture of the horn antenna in a grid shape and electrically connect to an inner surface of the horn antenna at the aperture of the horn antenna, wherein a width of the conductor grid in a direction orthogonal to an aperture plane of the horn antenna is different from an electrical length, at a frequency of power supplied to the horn antenna, of a path of a portion of the horn antenna at the conductor grid. ### Claim 2 (depends on 1) The horn antenna according to claim 1, wherein the conductor grid is meanderingly shaped in the direction orthogonal to the aperture plane of the horn antenna. ### Claim 3 (depends on 2) The horn antenna according to claim 2, wherein the conductor grid comprises: a conductor pattern having a grid-like shape intermittently arranged alternatingly at a front and a back of a dielectric plate in which the aperture of the horn antenna is arranged; and vias connecting the conductor pattern of the front and the back. ### Claim 4 (depends on 1) The horn antenna according to claim 1, wherein the conductor grid is bent and tilted in the direction orthogonal to the aperture plane of the horn antenna. ### Claim 5 (depends on 1) The horn antenna according to claim 1, wherein the conductor grid comprises: conductor patterns intermittently formed in the grid shape on a dielectric plate in which the aperture of the horn antenna is arranged; and reactance elements interconnecting the conductor patterns, the interconnected conductor patterns being mutually adjacent. ### Claim 6 (depends on 1) The horn antenna according to claim 1, wherein the conductor grid comprises a conductor pattern continuously formed in the grid shape on a dielectric plate in which the aperture of the horn antenna is arranged. ### Claim 7 (depends on 1) The horn antenna according to claim 1, wherein the conductor grid is fixed by a conductor to the inner surface of the horn antenna. ### Claim 8 (depends on 1) The horn antenna according to claim 1, wherein the conductor grid is fixed to the inner surface of the horn antenna through an electrically conductive elastic body. ### Claim 9 (depends on 1) An array antenna comprising: a plurality of horn antennas according to claim 1 disposed in a matrix pattern. ### Claim 10 (depends on 2) The horn antenna according to claim 2, wherein the conductor grid is fixed by a conductor to the inner surface of the horn antenna. ### Claim 11 (depends on 3) The horn antenna according to claim 3, wherein the conductor grid is fixed by a conductor to the inner surface of the horn antenna. ### Claim 12 (depends on 4) The horn antenna according to claim 4, wherein the conductor grid is fixed by a conductor to the inner surface of the horn antenna. ### Claim 13 (depends on 5) The horn antenna according to claim 5, wherein the conductor grid is fixed by a conductor to the inner surface of the horn antenna. ### Claim 14 (depends on 6) The horn antenna according to claim 6, wherein the conductor grid is fixed by a conductor to the inner surface of the horn antenna. ### Claim 15 (depends on 2) The horn antenna according to claim 2, wherein the conductor grid is fixed to the inner surface of the horn antenna through an electrically conductive elastic body. ### Claim 16 (depends on 3) The horn antenna according to claim 3, wherein the conductor grid is fixed to the inner surface of the horn antenna through an electrically conductive elastic body. ### Claim 17 (depends on 4) The horn antenna according to claim 4, wherein the conductor grid is fixed to the inner surface of the horn antenna through an electrically conductive elastic body. ### Claim 18 (depends on 5) The horn antenna according to claim 5, wherein the conductor grid is fixed to the inner surface of the horn antenna through an electrically conductive elastic body. ### Claim 19 (depends on 6) The horn antenna according to claim 6, wherein the conductor grid is fixed to the inner surface of the horn antenna through an electrically conductive elastic body.