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This Mini-Special Issue of the IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES (TMTT) is devoted to the 2019 Asia-Pacific Microwave Conference (APMC 2019), Singapore, December 10–13, 2019. APMC is one of the premier international conferences in the microwave community. The conference brought in a unique mix of high-quality keynote, invited, and contributed papers by world-class speakers from academia and industry, providing an opportunity for microwave family members to exchange their visions, insights, challenges, and progress in microwaves. It received a total submission of 1064 papers covering microwave to terahertz spectrum with a variety of applications by the authors from 56 countries/regions and finally accepted 720 papers after careful and rigorous peer review. The conference consisted of 71 technical oral and poster sessions from 53 technical tracks, eight workshops/short courses, 29 invited talks, and two plenary talks. In particular, 17 special sessions are convened by session organizers to discuss emerging technologies. [ABSTRACT FROM AUTHOR]

The attenuation due to rainfall in tropical regions has generated more concern in recent years. In Singapore, a microwave propagation experiment of line-of-sight communication has been conducted, and some experimental results have been obtained. The specific rainfall attenuation and rain attenuation duration temporal cumulative distributions over a ten-month period for 15 and 38.6 GHz are analyzed in this paper. The frequency scaling relationship between distributions is also discussed in detail. The results obtained in Singapore's tropical environment are found to be quite different from the CCIR's predictions. The results of our experiment can be employed to guide the design and application of terrestrial microwave communication systems, especially in tropical regions. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 21: 470–473, 1999. [ABSTRACT FROM AUTHOR]