Volume 31 Issue 6
Nov.  2022
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WU Qi. “Temporal Modal Analysis of Small Radiators”. Chinese Journal of Electronics, vol. 31 no. 6. doi: 10.1049/cje.2022.00.134
Citation: WU Qi. “Temporal Modal Analysis of Small Radiators”. Chinese Journal of Electronics, vol. 31 no. 6. doi: 10.1049/cje.2022.00.134

Temporal Modal Analysis of Small Radiators

doi: 10.1049/cje.2022.00.134
Funds:  This work was supported by the National Natural Science Foundation of China (61971018, U2141230)
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  • Author Bio:

    Qi WU received the B.S. degree from East China Normal University, Shanghai, China, and the Ph.D. degree from Shanghai Jiao Tong University, Shanghai, China, both in electrical engineering, in 2004 and 2009, respectively. He joined the faculty of School of Electronics and Information Engineering, Beihang University, Beijing, China, in 2009, and now he is a Full Professor. During 2011–2012, he was a Visiting Scholar in the Department of Electrical Engineering, University of California, Los Angeles. During 2014–2016, he was an Alexander von Humboldt Fellow in the Institute of Electromagnetic Theory, Technical University of Hamburg, Germany. He has authored over 40 journal papers, two books, and holds 20 patents as the first inventor. His research interests include broadband antennas, computational electromagnetics, and related EMC topics. Dr. Wu received the Young Scientist Award from the International Union of Radio Science (URSI) in 2011, the Nominee Award for Excellent Doctoral Dissertation from the National Minister of Education in 2012, Young Scientist Award of APEMC in 2016, and Excellent Researcher from Chinese Institute of Electronics in 2020. (Email: qwu@buaa.edu.cn)

  • Received Date: 2022-05-17
  • Accepted Date: 2022-10-09
  • Available Online: 2022-11-15
  • Publish Date: 2022-11-05
  • Resonance is a common physical phenomenon in real world, and the modal analysis is a useful tool. Within the regime of electromagnetics, characteristic mode theory is established in frequency domain (FD), and it is doubtful that whether we can find similar modes in time domain (TD). In this paper, resonating modes of a vibrating string are briefly reviewed. Special attentions are paid to the time-domain behaviors of the resonating modes, by following which a temporal modal analysis is proposed. Additionally, a narrow plate is selected as an example since it has a similar structure as the vibrating string. Temporal modal behaviors of the plate are presented and discussed. To further demonstrate this concept, a rigorous analysis of a sphere is provided. A frequency-independent condition is discussed and verified for small objects, and it results in a band-limited constraint. In addition, the temporal modal analysis with excitations is presented, and its potential applications are discussed with emphasis on the analyzing and optimizing transient behaviors of antennas. This work expands largely the field of characteristic mode and may find applications for scattering and antennas.
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