Active antenna unit - 5G heat sink calculation and experiment evaluation

Abstract

Today, density network deployment is being considered as one of the effective strategies to meet the capacity and connectivity demands of the fifth-generation (5G) cellular system [9]. Active Antenna Unit AAU-5G and Remote Radio Unit RRU 4G LTE Heatsinksare using natural convection cooling due to some outstanding advantages such as low cost, high reliability, noiseless operation and positioning independent from other cooling circuits. The main disadvantage is a relatively low heat transfer and an analytic model is required to efficiently design natural convection heat sinks according to the applied design constraints. This paper describes a natural convection heatsink for electronic circuits of power supplier, PA and FPGA ICs in AAU-5G/RRU 4G. The AAU-5G/RRU-4G natural cooling system is composed parallel plate heat sinks in order to find an optimum heat sink design based on minimum of Entropy energy [1,2] and optimization of V heatsink fin angles. Normally, AAU 4G/RRU 5G efficiency is very low due to transiting/receiving data in high speed of 2,6MHz to 3,8 GHz thus ICs lossesneed to be cooled by natural convection heatsink with Aluminum material such as AluSi10Mg, ALDC-12 or ALHT. The analytical calculation was applied to different heat sink profiles with
geometry parameters of I and V shape fin angles. Temperature measurements were carried out to validate the FEM model. Then, the achieved thermal performance was used to the thermal resistance of different RRU heatsinks. This paper will calculate an optimal thickness V shape of heatsink fin profile of AAU 5G/ RRU-4G heatsink to minimum material cost and improving efficient heatsink.