# US 2021/0280977 A1 · Dipole antenna fed by planar balun > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0280977 A1 - Document ID: US20210280977A1 - Status: Published application - Kind: A1 - Application number: 17/132,195 - Filed: 2020-12-23 - Published: 2021-09-09 - Earliest claimed: 2020-03-09 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Haeng Sook RO; Kanghee KIM; Gwangmoon PARK; Soo-Ho SOHN; Ki Cheol TAE - Web page: https://patentgrep.com/patent/US20210280977A1 ## CPC - H01Q 9/065: {Microstrip dipole antennas (patch antenna H01Q9/0407)} - 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) - H01Q 1/246: {specially adapted for base stations} - H01Q 1/26: with electric discharge tube - 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 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: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract A dipole antenna fed by a planar balun includes a first radiation element and a second radiation element respectively corresponding to poles of the dipole antenna, at least one dipole support column configured to connect the first radiation element and the second radiation element and to fix a gap between the first radiation element and the second radiation element, a planar balun connected to the first radiation element and the second radiation element and configured to feed the first radiation element and the second radiation element, and a balun housing coupled to the dipole support column and enclosing the planar balun. ## Claims ### Claim 1 A dipole antenna comprising: a first radiation element and a second radiation element respectively corresponding to poles of the dipole antenna; at least one dipole support column configured to connect the first radiation element and the second radiation element and to fix a gap between the first radiation element and the second radiation element; a planar balun connected to the first radiation element and the second radiation element and configured to supply balanced signals to the first radiation element and the second radiation element or to synthesize balanced signals received from the first radiation element and the second radiation element; and a balun housing coupled to the dipole support column and enclosing the planar balun. ### Claim 2 (depends on 1) The dipole antenna of claim 1, wherein the first radiation element and the second radiation element are arranged to be vertically or horizontally symmetrical to each other. ### Claim 3 (depends on 1) The dipole antenna of claim 1, wherein the first radiation element and the second radiation element have the same shape. ### Claim 4 (depends on 1) The dipole antenna of claim 1, wherein the first radiation element and the second radiation element are each formed of a metal material. ### Claim 5 (depends on 1) The dipole antenna of claim 1, wherein: the first radiation element and the second radiation element each comprise a groove for coupling to the dipole support column, and the groove of the first radiation element and the groove of the second radiation element are formed to face each other, and the dipole support column is inserted into the groove of the first radiation element and the groove of the second radiation element, to fix the first radiation element and the second radiation element. ### Claim 6 (depends on 1) The dipole antenna of claim 1, wherein the planar balun is configured to provide balanced signals with a phase difference of 180 degrees to the first radiation element and the second radiation element. ### Claim 7 (depends on 1) The dipole antenna of claim 1, wherein the planar balun is configured to allow impedance to gradually change between the dipole antenna and a transmitter or a receiver connected to the dipole antenna. ### Claim 8 (depends on 1) The dipole antenna of claim 1, wherein the balun housing is formed of a dielectric material. ### Claim 9 (depends on 1) The dipole antenna of claim 1, wherein the balun housing comprises a plurality of fixing holes to couple the balun housing to the planar balun. ### Claim 10 (depends on 1) The dipole antenna of claim 1, wherein the balun housing comprises an input/output terminal connected to a transmitter or a receiver connected to the dipole antenna. ### Claim 11 (depends on 1) The dipole antenna of claim 1, further comprising: a metal wire connected to each of the first radiation element and the second radiation element and configured to transfer a balanced signal between the planar balun and each of the first radiation element and the second radiation element. ### Claim 12 (depends on 11) The dipole antenna of claim 11, wherein the planar balun is connected to the metal wire and is configured to supply balanced signals to the first radiation element and the second radiation element via the metal wire or to synthesize balanced signals received from the first radiation element and the second radiation element. ### Claim 13 A dipole antenna comprising: a printed circuit board (PCB) substrate comprising at least one patch element; a planar balun configured to supply a balanced signal to the PCB substrate or to synthesize balanced signals received from the PCB substrate; a metal wire inserted into the PCB substrate, connected to the planar balun and configured to transfer a balanced signal between the PCB substrate and the planar balun; and a balun housing coupled to the PCB substrate and enclosing the planar balun. ### Claim 14 (depends on 13) The dipole antenna of claim 13, wherein the PCB substrate comprises a plurality of coupling holes to couple the PCB substrate to the balun housing. ### Claim 15 (depends on 13) The dipole antenna of claim 13, wherein the planar balun is configured to provide balanced signals with a phase difference of 180 degrees to the patch element.