การจัดการระบายความร้อนสำหรับ 5G 2022-2032

5G deployment is in full swing with mid-band infrastructure installed by the end of 2021 representing nearly 6 times what it was in 2019. However, this doesn't mean that all of the challenges have been solved. Much of the 5G infrastructure is repurposed 4G equipment at lower frequency bands. The real transition to 5G comes from the adoption of higher frequencies which have largely been categorised into sub-6 GHz and mmWave (> 20 GHz) bands. One of the key challenges is thermal management. As 5G deployment transitions to higher frequency, the antenna design, technology and material choices transition too. This will impact several factors such as the semiconductor technology, the associated die attach materials and thermal interface materials.

 

Whilst sub-6 GHz 5G may not provide the astonishing speeds and applications often publicised for 5G, it plays a crucial role in achieving coverage over large areas. Some of this is accounted for in lower bands more comparable to historic 4G but as we push above 4 GHz, the historic LDMOS (laterally-diffused metal-oxide semiconductor) power amplifiers begin to struggle with efficiency. This is where wide bandgap semiconductors like GaN (gallium nitride) start to shine. We have started to see GaN being adopted by players like Huawei in their 4G infrastructure. We are expecting GaN to take a greater market share in 5G and with GaN comes a transition in the die attach technology. In fact, IDTechEx is predicting that GaN power amplifiers will see a 4 fold increase in yearly demand over the next 10 years. AuSn is the typical die attach material for GaN today, but we foresee an opportunity for sintered pastes as a replacement with their improved thermal performance.

 

mmWave is the high-frequency technology that can deliver on the potentially wondrous applications of 5G with incredible download speeds and ultra-low latency. The challenge comes with signal propagation; as the frequency increases so does the attenuation of the signal, leading to reduced range and easy blocking by walls, windows and even severe weather conditions. To increase the antenna gain, the number of antenna elements will increase, but thanks to the smaller wavelength, the antenna units themselves will shrink. This leads to a much more tightly packed array of power amplifiers and beamforming electronic components and with that, a greater thermal management challenge. Thanks to the greater number of antenna elements, the power demand on each amplifier can potentially be reduced, but the highly compact nature of the electronics will lead to greater integration of components and likely rely more on silicon based technologies. However, mmWave small cells will require greater deployment numbers to provide sufficient coverage and due to their deployment scenarios, are unlikely to be able to utilise active cooling methods; combining this with the densification of beamforming components will present greater requirements for solutions like thermal interface materials.

 

Another popular technology for 5G is massive MIMO enabling infrastructure to serve more terminals in the same frequency band. This increases the number of RF chains per installation, beamforming capabilities and the number of antenna elements used in networks. The result is an increase in the materials required for the antenna PCB, power amplifiers, beamforming components and many more. Massive MIMO also drives data transfer rates and channels higher leading to a greater requirement on baseband processing units, power consumption and hence greater market opportunities for thermal interface materials.

 

 

Many of the initial 5G smartphones that were tested by the public (especially the mmWave compatible ones) would overheat whilst utilising 5G's high download speeds and would drop back to using 4G in order to cool down. This has become less of a concern with newer devices thanks to developments of 5G modems and antenna as well as effective thermal management strategies. The smartphone market is huge and presents a great opportunity for thermal interface materials and heat spreaders. Many more recent devices have utilised options like copper vapour chambers to enhance heat dissipation. But we have equally seen many players falling back towards graphite heat spreaders, whilst some are adopting advanced materials such as graphene heat spreaders. The material, application and quantity of thermal materials used in smartphones is continuing to evolve and presents a substantial market with billions of devices sold each year.

 

This report from IDTechEx addresses the trends in 5G deployment and how this impacts the antenna design, choice of semiconductor technology, die attach materials, and thermal interface materials. Both technological aspects and market forecasts are included through to 2032. Additionally, the report considers many smartphones and how the incorporation of 5G is impacting thermal materials (interface and heat spreaders).

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