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Hello experts, With the rapid development of 5G technology, I am currently involved in a 5G New Radio (NR) base station design project, with a special focus on the optimization of the radio frequency (RF) front-end. Our goal is to improve the energy efficiency ratio (EER) of base stations while ensuring signal quality and coverage. Considering the high frequency and wide bandwidth requirements of 5G NR, this task is quite challenging. We are exploring the use of efficient power amplifier designs, low-loss filter and antenna technologies, and advanced signal processing algorithms. I hope to gather some opinions and suggestions on this forum regarding: Which specific power amplifier technologies (e.g. Doherty amplifiers, GaN amplifiers) are proving to be particularly effective in 5G applications? How to deal with thermal management of the RF front-end, especially near the power amplifier, to prevent performance degradation? For processing wide-bandwidth signals, are there any recommended filter designs or materials that can effectively reduce insertion loss? When designing multiple-input multiple-output (MIMO) antennas, what techniques can help reduce mutual interference while improving antenna efficiency? I hope to benefit from your experience in the field of 5G RF design. Thank you everyone for sharing!