# US 2014/0198002 A1 · Dipole Antenna > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0198002 A1 - Document ID: US20140198002A1 - Status: Published application - Kind: A1 - Application number: 14/153,567 - Filed: 2014-01-13 - Published: 2014-07-17 - Earliest claimed: 2013-01-11 - Assignees: Roke Manor Research Limited - Applicants: Roke Manor Research Limited - Inventors: John Hunt - Web page: https://patentgrep.com/patent/US20140198002A1 ## CPC - H01Q 9/20: Two collinear substantially straight active elements; Substantially straight single active elements (H01Q9/28 takes precedence) - H01Q 9/28: Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines (waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00) - H05B 6/62: Apparatus for specific applications - H05B 6/72: Radiators or antennas - H05B 6/80: Apparatus for specific applications (stoves or ranges F24C7/02) - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract A dipole antenna, comprising: a dipole arrangement comprising at least a pair of antenna arms, each antenna arm having a feed end and a distal end, the feed ends positioned in proximity to each other; a feed structure, coupled to said dipole arrangement, comprising a balun for providing the antenna with a balanced feed; wherein, each antenna arm comprises: a conductive end plate, located at the distal end of the respective antenna arm; and an inductive coil, located at the feed end of the respective antenna arm. ## Claims ### Claim 1 A dipole antenna, comprising: a dipole arrangement comprising at least a pair of antenna arms, each antenna arm having a feed end and a distal end, the feed ends positioned in proximity to each other; and a feed structure, coupled to said dipole arrangement, comprising a balun for providing the antenna with a balanced feed; wherein, each antenna arm comprises: a conductive end plate, located at the distal end of the respective antenna arm; and an inductive coil, located at the feed end of the respective antenna arm. ### Claim 2 (depends on 1) A dipole antenna according to claim 1, wherein each antenna arm further comprises a conductive wire, located between the feed end and the conductive end plate; wherein said inductive coil is formed in said conductive wire. ### Claim 3 (depends on 1) A dipole antenna according to claim 1, wherein the feed structure comprises a coaxial transmission line, having an inner conductor and an outer conductor. ### Claim 4 (depends on 3) A dipole antenna according to claim 3, wherein said inner conductor is coupled to a first antenna arm of said pair of antenna arms, and said outer conductor is coupled to a second antenna arm of said pair of antenna arms. ### Claim 5 (depends on 4) A dipole antenna according to claims 4, wherein said feed structure further comprises a conductive cylinder, positioned adjacent said coaxial transmission line. ### Claim 6 (depends on 5) A dipole antenna according to claim 5, wherein said conductive cylinder and said coaxial transmission line are arranged substantially in parallel. ### Claim 7 (depends on 6) A dipole antenna according to claim 6, wherein said inner conductor is connected to said conductive cylinder at a feed end of said feed structure by a coupling member. ### Claim 8 (depends on 7) A dipole antenna according to claim 7, wherein said first antenna arm is connected to said conductive cylinder, and coupled to said inner conductor via said conductive cylinder and said coupling member. ### Claim 9 (depends on 8) A dipole antenna according to claim 8, wherein said feed structure further comprises a high-power capacitor, coupled between the conductive cylinder and said outer conductor of said coaxial transmission line, at said feed end of said feed structure. ### Claim 10 (depends on 9) A dipole antenna according to claim 9, wherein the balun is a twin-line balun, and a first line of said balun is formed by said conductive cylinder and a second line of said balun is formed by said outer surface of the outer conductor of said coaxial feed line. ### Claim 11 (depends on 10) A dipole antenna according to claim 10, wherein said conductive cylinder and outer conductor are coupled to ground at an end of the feed structure distal from said feed end. ### Claim 12 (depends on 1) An antenna according to claim 1, wherein the inductive coils are wound in the same direction. ### Claim 13 (depends on 1) An antenna according to claim 1, wherein the conductive end plate of each antenna arm have rounded corners. ### Claim 14 (depends on 13) An antenna according to claim 13, wherein the corners of said conductive end plates have large radii compared with size of the plates. ### Claim 15 (depends on 1) A dipole antenna according to claim 1, wherein each antenna arm extends along a primary axis, and said axes are arranged to be substantially aligned with a common plane. ### Claim 16 (depends on 15) A dipole antenna according to claim 15, wherein said primary axes are substantially aligned, each antenna arm extending away from said feed point in substantially opposing directions. ### Claim 17 (depends on 1) A dipole antenna according to claim 1, wherein the conductive end plates and inductive coils are arranged to load the antenna such that the antenna resonates at a frequency whose wavelength is long compared to the size of the antenna. ### Claim 18 (depends on 1) A dipole antenna according to claim 1, wherein said antenna is an electrically-short, said dipole is an electrically-short dipole, and the antenna is suitable for a high-power RF input. ### Claim 19 (depends on 17) A dipole antenna according to claim 17, wherein ka<1 , where k, the wave number, is 2π/λ and a is half the length of the antennas longest dimension. ### Claim 20 (depends on 1) A dipole antenna according to claim 1, wherein the balun is a DC ground for the antenna. ### Claim 21 (depends on 1) An antenna arrangement, comprising: the antenna of claim 1; and a supporting structure for supporting the antenna, wherein the antenna is connected to the supporting structure. ### Claim 22 (depends on 21) An antenna arrangement of claim 21, wherein said supporting structure is arranged to support said antenna such that said antenna arms positioned substantially horizontally and parallel to the ground. ### Claim 23 (depends on 22) An antenna arrangement according to claim 22, wherein said antenna is supported such that said conductive end plates are orientated substantially horizontally and parallel to the ground. ### Claim 24 (depends on 23) An antenna arrangement according to claim 23, further comprising a pair of supporting arms. ### Claim 25 (depends on 24) An antenna arrangement according to claim 24, wherein said a first end of each supporting arm is connected to a respective one of said antenna arms, at a position between the inductive coil and the conductive end plate. ### Claim 26 (depends on 21) A vehicle comprising the antenna arrangement of claim 21. ### Claim 27 (depends on 26) A vehicle according to claim 26, wherein the antenna arrangement is positioned at a front end of the vehicle.