Dual Bands and Dual Polarization Reflectarray for Millimeter Wave Application by Supercell Structure

Hara, Hiroshi; Nishime, Takumi; Michishita, Naobumi; Morishita, Hisashi; Matsuno, Hiromi; Ohto, Takuya; NAKANO, Masayuki

doi:10.1587/transcom.2022ebp3057

Cited by 1 publication

(2 citation statements)

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“…Dual-band anomalous reflectors have been realized by using multi-layer substrates at 28 GHz/39 GHz to realize desired local reflection phase distributions for each target frequency band [11]. However, owing to difficulties in alignment between layers, single-layer implementation is desirable for 6G applications above 100 GHz.…”

Section: Introductionmentioning

confidence: 99%

“…A CATR system, which consists of a feed antenna-coupled collimating optic that can generate a quasi-plane wave at a close range, has been widely used for far-field antenna characterization [19]- [22]. Although there have been reports on reflector characterization with a CATRbased system in the microwave and lower millimeter-wave regions [11], [23], there are no reports above 100 GHz for 6G applications.…”

Section: Introductionmentioning

confidence: 99%

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220/293 GHz Dual-Band Anomalous Reflectors Using Higher-Order Diffraction Modes and Their Precise Characterization Using a Compact Antenna Test Range System

Kato,

Ameya,

Tezuka

et al. 2023

IEEE Access

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We propose dual-band anomalous reflectors operating at 220 GHz and 293.3 GHz for 6G applications. The anomalous reflectors consist of paired patch elements on single-layer and via-free substrates. Based on a local reflection phase design and optimization of paired patch elements, higherorder diffraction modes can be controlled simultaneously at the two harmonic frequencies to achieve highly efficient dual-band anomalous reflections in identical directions with wide reflection angles. Two reflectors are designed and fabricated on cyclo-olefin polymer (COP) substrates for the reflection angles of 45 • and 50 • and the incident angles of 0 • and −10 • , respectively. To evaluate their anomalous reflection performances under plane wave illumination in the J-band, we develop a compact reflector characterization system in the J-band exploiting a compact antenna test range (CATR) technique consisting of an offset Gregorian antenna. The developed CATR-based system generates a quasi-plane wave with a beam diameter of approximately 250 mm at 300 GHz at a position 900 mm from the antenna, enabling precise far-field bistatic radar cross section (BRCS) measurements with a compact system size. The measured BRCSs of the prototypes are in good agreement with the simulated results and highly efficient dual-band anomalous reflection operations are experimentally demonstrated with the efficiencies of over 80 % excluding the material losses in both the designed bands.INDEX TERMS Anomalous reflectors, compact antenna test range, dual-band operation, J-band, metasurfaces, millimeter-wave, terahertz, 6G communication.

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Section: Introductionmentioning

confidence: 99%