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- W4385569673 abstract "A planar reflectarray (planar RA) with a small focal-to-diameter ratio (F/D) suffers from limited bandwidth. The primary factor hindering bandwidth is increasing the planar RA’s spatial path delay from the center to the edge, which introduces substantial phase variations that cannot be adequately compensated for by the RA elements away from the design frequency. A faceted RA has been proposed, but the structure becomes more complicated, particularly for a small F/D. Here, a new, simple RA design approach is proposed to enhance the bandwidth. A planar RA is cut to annular rings of subreflectarrays (sub-RAs), with the center sub-RA being circular. The sub-RAs are displaced to lower levels below the outer sub-RA, which is kept at the same position from the feed to reserve feed-edge illumination. The proposed structure is referred to as a <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>stepped</i> RA. Cross-bow-tie elements are used to design circular polarization (CP) planar and stepped RAs with an aperture diameter of 25.25 <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>λ</i> . Element rotation is employed for phase compensation. The stepped RA reduces the relative path delay as the ray moves toward the edge. A parametric study is performed, and a simple, compact stepped RA is designed. The performance of the stepped RA is compared to the planar RA. The two RA configurations are fabricated and measured. The stepped RA exhibits a matching bandwidth of 33.4%, a 1-dB gain bandwidth of 23.2% (13% broader than the planar RA), a 1-dB axial ratio (AR) bandwidth of 33.4%, and an aperture efficiency of 51% (at 30 GHz). Based on the results, the stepped RA’s 1-dB gain bandwidth is improved by 13% over the conventional planar RA." @default.
- W4385569673 created "2023-08-05" @default.
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- W4385569673 date "2023-01-01" @default.
- W4385569673 modified "2023-09-24" @default.
- W4385569673 title "Circularly Polarized Stepped Reflectarray: A new design approach for bandwidth enhancement." @default.
- W4385569673 doi "https://doi.org/10.1109/map.2023.3290412" @default.
- W4385569673 hasPublicationYear "2023" @default.
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