3-D Printed All-Dielectric Dual-Band Broadband Reflectarray with a Large Frequency-Ratio
- Publisher:
- Institute of Electrical and Electronics Engineers (IEEE)
- Publication Type:
- Journal Article
- Citation:
- IEEE Transactions on Antennas and Propagation, 2021, PP, (99), pp. 1-1
- Issue Date:
- 2021-01-01
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This communication proposes a new all-dielectric broadband dual-band reflectarray with a large frequency-ratio using low-cost 3-D printing. In contrast to conventional reflectarrays using metallic resonant cells or dielectric slabs as phasing elements with full metal ground, the proposed design uses air as the phasing element and a stepped dielectric mirror structure as the ground. In this way, the metal ground is removed, which makes the design an all-dielectric one. Taking advantage of the dielectric mirror that only exhibits a bandgap in the pre-designed band while allowing electromagnetic (EM) waves to pass through it at the frequency out of the bandgap region, a dual-band reflectarray is obtained. By properly selecting the bandgap frequency of the dielectric mirror, the dual-band frequency-ratio is scalable and can be very large. Furthermore, instead of using a metallic or dielectric resonator based on resonance, air layers with linear phase response are adopted as the phasing element. Thus, the reflectarray shows broadband and stable performance over the dual-band. Compared with state-of-art works using printed-circuit-boards (PCBs) or micro-fabrication, the proposed design is low-cost and lightweight, and can be rapidly prototyped. For proof-of-concept, a prototype operating at K band and V band with a frequency-ratio of 2.7 is printed and measured.
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