Polarization-Insensitive Circular Reflectarray for Satellite Applications in Ka-band

Ali, Ali Jihad; Khalily, Mohsen; Araghi, Ali; Tafazolli, Rahim

doi:10.1109/aps/ursi47566.2021.9704204

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…Several works have already discussed generating OAM beams by compensating the phase of reflectarray antennas [18]. This work utilises a new concept to produce steered OAM beams, which can be generalised to achieve full beam-steering.…”

Section: Steered Oam Beamsmentioning

confidence: 99%

Beam‐steering capability for OAM‐based reflectarray at 5G‐mmWave frequencies

Ali

Khalily

Brown

et al. 2022

IET Microwaves Antenna & Prop

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The ability of the reflectarray antenna (RA) to perform orbital angular momentum (OAM) beam‐steering with low divergence angles at the fifth generation (5G) millimetre‐wave (mmWave) bands is demonstrated. To provide steered OAM beams, it is necessary to regulate the scatterer's geometries smoothly throughout the focal area to follow the required twisted distribution. The traditional numerical method to compensate for the phase is modified to enable the 3D scanning property of OAM beams, so it is possible to avoid the feeder blockage and produce high‐gain steered OAM beams. Likewise, reducing the inherent beam divergence of OAM beams can be obtained by examining the most satisfactory phase distribution of the scatterers by fitting the focal length. The simulated radiation pattern is validated by the measured radiation pattern of the fabricated RA in the frequency range between 28.5 and 31.5 GHz.

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Section: Steered Oam Beamsmentioning

confidence: 99%

Beam‐steering capability for OAM‐based reflectarray at 5G‐mmWave frequencies

Ali

Khalily

Brown

et al. 2022

IET Microwaves Antenna & Prop

Self Cite

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“…Highly directive antennas are desirable in many applications like satellite communication, radar, and wireless backhaul networks for effective long-distance and interference-free communication 7,8 . The conventional parabolic dish 9 and horn antennas are not practical in some modern applications due to their bulky and heavy size.…”

Section: Introductionmentioning

confidence: 99%

A Low-Profile 3-D Printable Metastructure for Performance Improvement of Aperture Antennas

Ali,

Lalbakhsh,

Koziel

et al. 2024

Preprint

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In order to increase the radiation performance of aperture-type antennas, this paper demonstrates a low-profile, planar, single-layered, three-dimensional (3-D) printable metastructure. The proposed hybridized metastructure is highly transparent as it is made out of novel hybrid meta-atoms having transmission coefficient magnitudes greater than - 0.72 dB and fully complies with the near-field phase transformation principle. The hybridized design approach makes the metastructure planar, low-profile, light in weight, and compatible with additive printing technology. For the proof-of-concept, such metastructure is developed and numerically verified to enhance the radiation performance of a resonant cavity antenna (RCA). With the proposed metastructure, the peak directivity improvement of RCA is 8.6 dBi (from 11.4 dBi to 20 dBi) at the operating frequency of 12.4 GHz. The aperture efficiency and 3-dB directivity bandwidth of RCA with the metastructure are 41.46% and 16.5%, respectively. Using readily accessible thermoplastics or polymers and copper with cost-effective fused deposition modeling (FDM) 3-D printing technology, the proposed planar hybridized metastructure can be prototyped commercially.

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“…Accordingly, the electric field (E-field), received on the surface, is reflected with a shaped wavefront based on the phase distribution. Thus, RAs exhibit the possibility of beam-shaping to reflect different wavefronts including pencil and helical beams [4].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Wideband Dielectric Reflectarray Antenna with OAM beams for mm-Wave Applications

Ali

Khalily

Tafazolli

2022

2022 International Symposium on Antennas and Propagation (ISAP)

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The proposed structure is presented to improve the inherited limited bandwidth and reduce the production of grating lobes in reflectarray antennas (RAs). A dielectric RA with 200 mm × 200 mm is designed and simulated to produce an orbital angular momentum beam (OAM) of the second mode with averaged realized gain of around 20 dBi in the band of 25-40 GHz, which covers most of 5G mm-wave bands (n257, n258, n260, and n261). To achieve the mentioned specifications, an inter-element spacing of 0.25λ is adopted.

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Polarization-Insensitive Circular Reflectarray for Satellite Applications in Ka-band

Cited by 6 publications

References 12 publications

Beam‐steering capability for OAM‐based reflectarray at 5G‐mmWave frequencies

Beam‐steering capability for OAM‐based reflectarray at 5G‐mmWave frequencies

A Low-Profile 3-D Printable Metastructure for Performance Improvement of Aperture Antennas

Ultra-Wideband Dielectric Reflectarray Antenna with OAM beams for mm-Wave Applications

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