Antenna set
An antenna set includes an antenna unit group for transmitting streams in distributed-MIMO, wherein the antenna unit group includes a plurality of antenna units arranged apart from each other, and wherein the plurality of antenna units is installed at a height between 3 m and 8 m, inclusive, with a non-directional angle of a radiation pattern in a horizontal plane being more than or equal to 180°, and a radiation peak of a main lobe is inclined at a depression angle of greater than 0° and less than or equal to 15°.
1 . A Base Station (BS) antenna set comprising an antenna unit group for transmitting streams in distributed-MIMO,
wherein the antenna unit group includes a plurality of antenna units arranged apart from each other, and
wherein the plurality of antenna units is installed at a height between 3 m and 8 m, inclusive, with a non-directional angle of a radiation pattern in a horizontal plane being more than or equal to 180°, and a radiation peak of a main lobe is inclined at a depression angle of greater than 0° and less than or equal to 15°,
wherein when an average value of depression angles for the plurality of antenna units is a [°], an average value of installation heights for the plurality of antenna units is b [m], an average value of half-widths for main lobes radiated from the plurality of antenna units is c [°], and an average value of intervals between adjacent antenna units included in the plurality of antenna units is d [m], following equations are satisfied:
PC1=−( a/ 10.6)−( b/ 10.8)+( c/ 5.7)+( d/ 19.8)−1.8
PC2=( a/ 12.0)+( b/ 2.5)+( c/ 6.6)+( d/ 99.6)−4.9
PC2≥−4.5×PC1−4.5
PC2≤0.15×PC1+1.0, and
wherein the plurality of antenna units is installed at a height between 3.5 m and 7.5 m, inclusive, the radiation peak of the main lobe is inclined at a depression angle between 1.0° and 14°, inclusive, and the plurality of antenna units includes two antenna units adjacent to each other, and an interval therebetween is between 20 m and 70 m, inclusive.
2 . The Base Station (BS) antenna set according to claim 1 , wherein each of the plurality of antenna units has a half-width of the main lobe of between 6° and 15°, inclusive.
3 . The Base Station (BS) antenna set according to claim 1 , wherein each of the plurality of antenna units has 360° omnidirectional directivity of radiation pattern in the horizontal plane.
4 . The Base Station (BS) antenna set according to claim 1 , wherein, at a location where a direct wave reception level of a radio wave transmitted from one antenna unit included in the antenna unit group is maximized, “a reflected wave reception level of the radio wave [dB]+the direct wave reception level of the radio wave [dB]” is between 0.7 and 0.95, inclusive.
5 . The Base Station (BS) antenna set according to claim 1 , further comprising a reflector that reflects a radio wave between adjacent antenna units included in the plurality of antenna units.
6 . The Base Station (BS) antenna set according to claim 1 ,
wherein the antenna unit group includes a first antenna unit and a second antenna unit adjacent thereto, and
wherein when, viewed in a direction perpendicular to the horizontal plane, a length of a line segment connecting the first antenna unit and the second antenna unit is d, a point extending the line segment from the first antenna unit by 0.5×d is p 1 , a point extending the line segment from the second antenna unit by 0.5×d is p 2 , a straight line passing through p 1 and p 2 is L 1 , a straight line passing through the point p 1 and perpendicular to the straight line L 1 is L 2 , a straight line passing through the point p 2 and perpendicular to the straight line L 1 is L 3 , a straight line parallel to the straight line L 1 and farthest therefrom within a range not intersecting with an obstacle preventing propagation of radio waves is L 4 , and a rectangular area surrounded by the straight lines L 1 , L 2 , L 3 , and L 4 is S, the first antenna unit and the second antenna unit are arranged such that a proportion of an area where throughput greater than or equal to 1 Gbps is obtained in the rectangular area S is greater than or equal to 90%.
7 . The Base Station (BS) antenna set according to claim 1 , wherein the antenna units are installed on one or more structures built on a ground.
8 . The Base Station (BS) antenna set according to claim 7 , wherein the one or more structures are a power pole, a utility pole, a street light, a traffic light, a sign, or a building.
9 . The Base Station (BS) antenna set according to claim 1 , wherein the antenna does not include beam forming.