The dual-band Doherty power amplifier structure was first proposed and successfully implemented in the world, which supports the simultaneous operation of dual-band base stations, can meet the new requirements of LTE-Advanced system, and is more efficient than the traditional single-frequency parallel structure. This achievement won the student thesis award of 20 10 Asia-Pacific Microwave Conference and was published in IEEETransactions in MTT magazine. IEEETransactions on MTT reported the dual-frequency Doherty power amplifier as a new power amplifier structure in the power amplifier album of June 20 12 [Annex; AndreiGrebennikov, an internationally renowned power amplifier expert, introduced the Dual-frequency Doherty Power Amplifier in Switching Mode RF and Microwave Power Amplifiers (2nd Edition) published by Elsevier 20 12.
A design method of miniaturized notebook built-in antenna based on coupled grounding branch is proposed. A five-band antenna which can work in GSM850, GSM900, DCS, PCS and WCDMA at the same time is realized in a volume of 60mm× 10mm×5mm, and the radiation efficiency is more than 50% in all working frequency bands. This achievement was published in ElectronicLetters, which has been cited by others for 34 times and published in 2065438. As the world's first WWAN five-frequency laptop built-in antenna, it has been cited by the research group of Vice President of Sun Yat-sen University in Taiwan and Professor Weng Lujin of IEEEFellow for many times.