Thermal Analysis of MAXITE Micro Base Station
MAXITE is a new micro base station recently released from Ericsson. It consists of three parts; the active antenna unit (AAU), the radio base station and the power battery cabinet (PBC). The difference between MAXITE and a conventional base station is that the amplifiers in the base station have been lifted to the antenna. The advantage is that the active antenna will allow the coverage to increase up to 300% and the cabling is much simpler between the base station and the antenna. The downside is the thermal consequence of the dissipated power in the antenna. This paper will deal with all three parts of MAXITE. The maximum ambient temperature of the site is 45°C and a sun radiation of 1120W/m2K, horizontally. The thermal consequence of the active antenna is among other things the need to apply cooling fins along one side. The antenna is painted with a light color to reduce the sun impact. Cooling fins on two sides of the unit cools the base station. Sun shields are placed around the cooling fins. The unit is cooled to a maximum temperature on the foundation of 70°C. The unit also includes a heater that heats the unit at low temperature conditions. The power battery unit consists of a large battery pack and a few converters. A static simulation of the unit at maximum temperature yielded high temperatures that would seriously damage the batteries. A dynamic simulation was then conducted which enabled a much lower maximum temperature. Even though the ambient temperature changed from 45°C to 10°C the variation of the temperature within the PBC was within 3°C.
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