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Ultra‐wideband radar cross‐section reduction for ring‐shaped microstrip antenna based on characteristic mode analysis
Author(s) -
Liu Yakun,
Du Biao,
Jia Dan,
Jia Yongtao
Publication year - 2021
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32791
Subject(s) - radar cross section , microstrip antenna , optics , radiation pattern , patch antenna , antenna (radio) , antenna measurement , acoustics , physics , scattering , engineering , telecommunications
In this letter, a characteristic mode analysis method is presented for ultra‐wideband radar cross‐section (RCS) reduction of microstrip antenna. By analyzing the magnitude of the modal weighting coefficients (MWCs), the important scattering modes can be found, which contribute a lot to the RCS of the antenna. Then, these scattering modes are suppressed through shape modification. To realize an ultra‐wideband RCS reduction (RCSR) of a ring‐shaped microstrip antenna, three pairs of slots are placed at suitable locations of the reference antenna to disrupt the current path, so as to suppress the important scattering modes while keeping the radiation modes work properly. Compared to the reference antenna, the proposed antenna achieves 6 dB RCSR on average over the frequency band of 0.5 GHz−5 GHz (163.64%) for x ‐polarization incident wave. The peak reduction at 3.0 GHz is up to 23 dB. Meanwhile, the radiation performance keeps well. The measured and simulated results are in good agreement, which validates the presented method.