Optimization-based design of a single-layer wideband reflectarray antenna in the terahertz regime

Sharifi, Raziyeh; Basiri, Raheleh; Zareian‐Jahromi, Ehsan

doi:10.1007/s10825-019-01435-y

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…The THz band provides ultra high-bandwidth and ultra-low latency to satisfy the requirements of 6G applications for indoor communications such as wireless brain-computer interactions (BCI) and the internet of everything (IoE). Nevertheless, the inherent lowefficiency of antennas in the THz band raises concerns related to the improper radiations and low-gain characteristics [1]. Since the periodic and quasi-periodic structures [2] offer highgain antennas in the microwave and THz ranges, they can be adopted to enhance the antenna efficiency in the THz band [3].…”

Section: Introductionmentioning

confidence: 99%

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

Ali

Khalily

Araghi

et al. 2021

2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)

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A circular reflectarray antenna (RA) for generating Orbital Angular Momentum (OAM) modes in the Terahertz (THz) band is introduced. An interlaced unit cell is proposed to reach a phase variation of 328 • at 185 GHz to 188 GHz. Combining RA, OAM, and THz technologies in one structure can be utilized to reach the future requirements of 6G networks. That is due to the additional degree of freedom that OAM beams can provide for data multiplexing in short-distance wireless communication.

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Section: Introductionmentioning

confidence: 99%

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

Ali

Khalily

Araghi

et al. 2021

2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)

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“…Some optimization algorithm may be utilized to develop an optimized cell with specific characteristics. Random Hill Climbing (RHC) optimization algorithm is one of the most efficient utilized algorithms [27].…”

Section: -Introductionmentioning

confidence: 99%

Design and optimization of a wideband metasurface for utilization in a highly efficient terahertz reflectarray antenna

Sharifi¹,

Basiri²,

Zareian‐Jahromi³

2021

Preprint

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In this manuscript, two wideband single layer reflectarray antennas are designed utilizing an optimization-based metasurface in terahertz (THz) regime. It is demanded to design a metasurface with wide phase variation range in a broad frequency region of terahertz band. The proposed metasurface is designed based on Random Hill Climbing optimization algorithm whereas a multiobjective fitness function is defined to consider the desired characteristics. A provided link between Matlab and HFSS softwares is utilized to define and simulate various metasurfaces. The finalized cell has considerable wide phase variation (≥ 600˚) and notable bandwidth of 30.76% (1.1–1.5 THz) whereas the mean value of magnitude variation of reflection coefficient is -0.42dB. Two square and circular metasurfaces are designed based on the optimized cell and illuminated using a THz feeding horn antenna. The angles of incident and reflected waves are considered equal to zero. The simulation results confirm 3-dB gain bandwidths of 20.3% and 20.4% for square and circular reflectors, respectively. Moreover, the considerable efficiencies of 45.67% and 46.27% are achieved for square and circular arrays, consequently. The maximum gain of square array with 361 elements is 25.9dB whereas it is equal to 24.9dB for circular metasurface including 277 unit cells.

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“…Random Hill Climbing (RHC) optimization algorithm is one of the most efficient utilized algorithms. 28,29 The RHC is a powerful optimization algorithm that is moving towards increasing the value of an objective function. This algorithm has a repetitive process starting with a desired or random solution and then, provides a better response by changing the position of the bits in a binary string.…”

Section: Introductionmentioning

confidence: 99%

Optimization based design of a wideband metasurface for utilization in a terahertz reflectarray antenna with high efficiency

Sharifi

Basiri

Zareian‐Jahromi

2021

Int J RF Mic Comp-Aid Eng

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In this manuscript, two wideband single layer reflectarray antennas are designed utilizing an optimization-based metasurface in terahertz (THz) regime. It is demanded to design a metasurface with wide phase variation range in a broad frequency region of terahertz band. The proposed metasurface is designed based on Random Hill Climbing optimization algorithm whereas a multiobjective fitness function is defined to consider the desired characteristics. A provided link between Matlab and HFSS softwares is utilized to define and simulate various metasurfaces. The finalized cell has considerable wide phase variation ≥ 600 ∘ ð Þ and notable bandwidth of 30.76% (1.1-1.5 THz)whereas the mean value of magnitude variation of reflection coefficient is À0.42 dB. Two square and circular metasurfaces are designed based on the optimized cell and illuminated using a THz feeding horn antenna. The angles of incident and reflected waves are considered equal to zero. The simulation results confirm 3-dB gain bandwidths of 20.3% and 20.4% for square and circular metasurfaces, respectively. Moreover, the considerable efficiencies of 45.67% and 46.27% are achieved for square and circular arrays, consequently.The maximum gain of square array with 361 elements is 25.9 dB whereas it is equal to 24.9 dB for circular metasurface including 277 unit cells.

show abstract

Optimization-based design of a single-layer wideband reflectarray antenna in the terahertz regime

Cited by 9 publications

References 34 publications

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

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

Design and optimization of a wideband metasurface for utilization in a highly efficient terahertz reflectarray antenna

Optimization based design of a wideband metasurface for utilization in a terahertz reflectarray antenna with high efficiency

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