# US 2013/0278478 A1 · Antenna arrangement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0278478 A1 - Document ID: US20130278478A1 - Status: Published application - Kind: A1 - Application number: 13/918,408 - Filed: 2013-06-14 - Published: 2013-10-24 - Earliest claimed: 2007-09-24 - Assignees: Cellmax Technologies AB - Applicants: Cellmax Technologies AB - Inventors: Stefan JONSSON; Dan KARLSSON - Web page: https://patentgrep.com/patent/US20130278478A1 ## CPC - H01Q 21/0006: {Particular feeding systems} - H01P 1/183: {Coaxial phase-shifters (H01P1/181, H01P1/185, H01P1/19 take precedence)} - H01P 5/026: {between coaxial lines} - H01Q 1/246: {specially adapted for base stations} - H01Q 3/32: by mechanical means - H01Q 9/16: with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole (H01Q9/44 takes precedence) - H01Q 21/08: the units being spaced along or adjacent to a rectilinear path {(waveguide fed H01Q21/0037)} - 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 Antenna arrangement for a multi-radiator base station antenna, the antenna having a feeding network based on air filled coaxial lines (1, 2, 3), wherein each coaxial line comprises an outer conductor (8) and an inner conductor (4, 5, 6), wherein an adjustable differential phase shifter including a dielectric part (9) is arranged in the antenna and said dielectric part being movable longitudinally in relation to at least one coaxial line 1, 2, 3). ## Claims ### Claim 1 A multi-radiator base station antenna, comprising: a feeding network comprising at least one set of one input (1; 21) and two output (2, 3; 22, 23) coaxial lines where the two output coaxial lines (2, 3; 22, 23) are aligned but pointing in opposite directions and the input coaxial (1) line is connected to one end of each of the two output coaxial lines (2, 3; 22, 23) via a crossover (7; 29), wherein each coaxial line comprises an outer conductor (8, 30) and an inner conductor (4, 5, 6, 25, 26, 27, 28); and an adjustable differential phase shifter including a dielectric part (9, 31) arranged for at least one set of output coaxial lines (2, 3; 22, 23) so that by moving the dielectric part (9; 31) that is present within the two output coaxial lines (2, 3; 22, 23) alters the amount of dielectric material in the first output coaxial line with respect to the amount of dielectric material in the second output coaxial line whereby the phase at the outputs is varied. ### Claim 2 (depends on 1) The antenna according to claim 1, wherein a first side of an extruded metal profile forms the outer conductors of the coaxial lines and a second side of the extruded metal profile that is opposite the first side forms a reflective surface thus integrating the coaxial lines and the adjustable differential phase shifter are integrated parts of the antenna reflector. ### Claim 3 (depends on 1, 2) The antenna according to claim 1 or 2, wherein the outer conductors (8, 30) of the coaxial lines have a longitudinal slit. ### Claim 4 (depends on 1, 2) The antenna according to claim 1 or 2, wherein the antenna further comprises a third output coaxial line (24) being parallel to the two other output coaxial lines (22, 23), and the input coaxial line (21) is connected to one end of each of the three output coaxial lines (22, 23, 24) via a crossover (29), wherein one differential phase shifter is arranged for at least one set of aligned output coaxial lines (22, 23) so that by moving the dielectric part (31) that is present within the two aligned output coaxial lines (22, 23) alters the amount of dielectric material in the first output coaxial line with respect to the amount of dielectric material in the second output coaxial line whereby the phase at the two outputs (22, 23) is varied. ### Claim 5 (depends on 1) The antenna according to claim 1, wherein the dielectric part (9; 31) in cross section is at least partially open on at least one side. ### Claim 6 (depends on 1) The antenna according to claim 1, wherein the dielectric part (31) in cross-section is substantially symmetric around a plane through the center of the inner conductor (26, 27, 28) and said plane being perpendicular to the antenna reflector. ### Claim 7 (depends on 1) The antenna according to claim 1, wherein the dielectric part (9; 31) is guided by the outer conductor (8; 30). ### Claim 8 (depends on 1) The antenna according to claim 1, wherein the inner conductor (5, 6; 26, 27) is at least partly surrounded by a polymer material layer (12; 32). ### Claim 9 (depends on 8) The antenna according to claim 8, wherein the dielectric part (9; 31) is guided by the inner conductor (5, 6; 26, 27). ### Claim 10 (depends on 1, 2) The antenna according to claim 1 or 2, wherein the diameter of the inner conductors (4, 5, 6; 25, 26, 27, 28) is varied and chosen such as to form impedance matching networks. ### Claim 11 (depends on 1) The antenna according to claim 1, wherein the dimensions of the dielectric part (9; 31) is reduced at its end segments (41, 42; 45, 46) in order to improve impedance matching. ### Claim 12 (depends on 1) The antenna according to claim 1, wherein the differential phase shifter is at least partly covered by a conductive lid (10, 11; 33) that is galvanically connected to the outer conductor (8; 30) of the coaxial lines. ### Claim 13 (depends on 1) The antenna according to claim 1, wherein the differential phase shifter is at least partly covered by a conductive lid (10, 11; 33) that is capacitively connected to the outer conductor (8; 30) of the coaxial lines. ### Claim 14 (depends on 1) The antenna according to claim 1, wherein the antenna comprises dual polarised radiators. ### Claim 15 (depends on 4) The antenna according to claim 4, wherein the dielectric part (9; 31) in cross section is at least partially open on at least one side. ### Claim 16 (depends on 4) The antenna according to claim 4, wherein the dielectric part (9; 31) is guided by the outer conductor (8; 30). ### Claim 17 (depends on 4) The antenna according to claim 4, wherein the inner conductor (5, 6; 26, 27) is at least partly surrounded by a polymer material layer (12; 32).