Abstract
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 predesigned 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 the state-of-the-art works using printed circuit boards (PCBs) or microfabrication, 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.
Original language | English |
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Pages (from-to) | 7035-40 |
Number of pages | 6 |
Journal | IEEE Transactions on Antennas and Propagation |
Volume | 69 |
Issue number | 10 |
Early online date | 5 May 2021 |
DOIs | |
Publication status | Published - 1 Oct 2021 |
Bibliographical note
This work was supported by Blue Sky Grant, Tech Lab, Faculty of Engineering and Information Technology, University of Technology Sydney.Keywords
- Dielectrics
- Mirrors
- Photonic band gap
- reflections
- Dual band
- Reflection coefficient
- K-band