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Wideband and low RCS planar circularly polarized array based on polarization conversion of metasurface
Author(s) -
Zheng Qi,
Guo Chenjiang,
Ding Jun
Publication year - 2018
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.31050
Subject(s) - optics , planar , planar array , wideband , antenna array , physics , radar cross section , bandwidth (computing) , polarization (electrochemistry) , circular polarization , axial ratio , collinear antenna array , phased array , radiation , antenna (radio) , microstrip antenna , slot antenna , microstrip , telecommunications , engineering , computer science , scattering , chemistry , computer graphics (images)
In this article, a planar wideband circularly polarized (CP) slot antenna array based on metasurface (MS) with low radar cross section (RCS) is proposed. The array is comprised of 2 × 2 CP MS‐based antennas fed with a sequentially rotated feeding network. For each CP antenna, the CP radiation is achieved due to polarization conversion of the MS. Simultaneously, the total MS patches of the array can be viewed as checkerboard composed of MS array and mirror array. A 180 ° phase difference between the MS units and the mirror units ensures RCS reduction. Simulated results demonstrate that about 34.6% operating bandwidth in the frequency of 4.3–6.1 GHz (both S 11 ≤ –10 dB and AR < 3 dB). In addition, over 5 dB RCS reduction is obtained in the entire operation band under normal incidence with respect to the array without MS for both x ‐ and y ‐polarizations. The simulated monostatic RCS less than −30.9 dBsm is observed at 5.0 GHz. A prototype of the array is fabricated and measured, which are in good agreement with simulated results.