The authors regret that two of the names of their co-authors appear incorrectly in the article.
The correct names are: Wubin Kong and Yuchao Hu.
Some affiliation information was also omitted. The affiliations 2 and 3 should read as follows:
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2. National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, Wuhan, China.
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3. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, NanJing, China.
The article has now been corrected.
