Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 65, Issue 9, Pages 4529-4538Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2017.2722824
Keywords
Circular polarization; element rotation method; reflectarray; satellite communications; wideband array
Funding
- U.K. Engineering and Physical Sciences Research Council [EP/N032497/1]
- National Natural Science Foundation of China [61372077]
- Science and Technology Innovation Commission of Shenzhen [ZDSYS 201507031550105]
- Guangdong Provincial Science and Technology Programs [2013B090200011, 2016B090918080]
- EPSRC [EP/P015840/1, EP/N032497/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/P015840/1, EP/N032497/1] Funding Source: researchfish
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This paper presents a single-layer circularly polarized reflectarray which achieves large bandwidth (BW) in terms of axial ratio (AR), gain, aperture efficiency (AE) and radiation pattern. By using a novel wideband S-shaped phasing element, an offset-fed reflectarray with 20 degrees offset beam is designed based on the element angular rotation method. Theoretical analysis is given to analyze the effect of angular rotated elements on the performance of the reflectarray, which indicates that the AR BW of the reflectarray can exceed the AR BW of the feed horn. Furthermore, the influence of the differential spatial phase delay is analyzed quantitatively, and the performance of S-element-based reflectarrays with different aperture sizes are investigated and discussed. To verify these concepts, a 180 mm x 180 mm prototype with 15 x 15 elements is fabricated and measured. The measured results confirm that the proposed reflectarray achieves a 68.5% 3-dB AR BW (7 to 14.3 GHz) and a 47.8% 3-dB gain BW (8.6 to 14 GHz). Moreover, the AE is larger than 50% in a 33% BW and larger than 30% in a 64% BW.
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