Dual-Frequency Reflectarray Based on Split-Ring Slots
| Autor: | Jose I. Martinez-Lopez, Jovanni Silva-Montero, Alexander E. Martynyuk, Jorge Rodriguez-Cuevas, Jesus A. Ortiz-Fuentes |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Split ring business.industry 020208 electrical & electronic engineering 020206 networking & telecommunications 02 engineering and technology Concentric ring Optics 0202 electrical engineering electronic engineering information engineering Dual frequency Electrical and Electronic Engineering Atomic physics business Circular polarization |
| Zdroj: | IEEE Antennas and Wireless Propagation Letters. 16:952-955 |
| ISSN: | 1548-5757 1536-1225 |
| DOI: | 10.1109/lawp.2016.2615049 |
| Popis: | This letter presents a dual-frequency reflectarray (RA). This RA is capable of forming two differently oriented main lobes with the same sense of circular polarization in the directions determined by the reflection elevation angles $\theta _{01}$ and $\theta _{02}$ at two closely spaced frequencies. The RA element contains a pair of concentric split-ring slots with different angular rotations. The geometry of the element was modified and optimized to suppress a mutual coupling between the concentric rings. To validate the operation principle, 317-element offset RAs $\text{RA}\_0\_20$ , $\text{RA}\_20\_0$ , $\text{RA}\_30\_40$ , and $\text{RA}\_40\_30$ were designed to operate at 34.5 and 38.5 GHz for the pairs of elevation angles ( $\theta _{01}$ , $\theta _{02}$ ) equal to (0 $^\circ$ , 20 $^\circ$ ), (20 $^\circ$ , 0 $^\circ$ ), (30 $^\circ$ , 40 $^\circ$ ), and (40 $^\circ$ , 30 $^\circ$ ), respectively. Then, these RAs were fabricated and tested. The highest measured aperture efficiency of 0.45 was observed for $\text{RA}\_0\_20$ and $\text{RA}\_20\_0$ at 34.2 GHz, whereas the $\text{RA}\_30\_40$ demonstrated the lowest aperture efficiency of 0.25 at 38.2 GHz. |
| Databáze: | OpenAIRE |
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