期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 67, 期 8, 页码 5362-5371出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2019.2911342
关键词
Absorbing media; dielectric lens; gain filtering; high gain; low RCS; phase shift; reflectarray (RA) antenna
资金
- National Natural Science Foundation of China [61571084]
- Equipment Pre-Research Funding (EPRF) [6141B06120101]
- National Department Science and Technology Innovation (NDSTI) [1716313ZT00802902]
- Aalborg University (AAU) Young Talent Program
This paper presents a reflectarray (RA) antenna operating at X-band with gain filtering and low radar cross section (RCS) properties. The unit cell (UC) for the proposed RA antenna design combines a band-notched absorber unit and a dielectric lens unit together, where the dielectric lens unit serving as a phase shift is coated on the absorber unit to achieve codesign. Importantly, it is required that the UCs should still maintain the high notch-band-edge selectivity property that the band-notched absorber originally has when the profile of the dielectric lens unit is varied to cover a full phase cycle (2 pi) for the proposed RA antenna design. For demonstration, an absorber is presented with a high notch-band-edge selectivity and a wide absorption bandwidth performance in vertical polarization and horizontal polarization, respectively; a dielectric lens based on square posts is rigorously designed to be coated on the absorber seamlessly to construct the desired UC. The simulation results show that the proposed RA antenna has a bandpass-like gain filtering performance and pencil-beam radiation patterns within the notch band, which is experimentally verified by the measured results. In addition, the measured results also reveal that the RCSs of the proposed RA antenna are significantly reduced compared to counterparts of the conventional RA antenna in horizontal polarization and out of the notch band in vertical polarization.
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