High Altitude Platforms Stations (HAPS) are an enabling technology that could respond to the increasing demand for connectivity that the world is experiencing. This thesis, realised in collaboration with Stratobotic s.r.l., a startup founded in Turin focused on such services, is aimed at developing a lightweight, low power and re-configurable telecommunication payload to deliver scalable solutions. A series of telecommunication links, in which HAPS could play a significant role, are evaluated and analysed in the form of Link Budgets. Functional and physical designs are also developed and investigated, analysing the performances of the payload with MATLAB/Simulink.