A Novel Phase Synthesis Approach for Wideband Reflectarray Design

Mao, Yilin; Xu, Shenheng; Yang, Fan; Elsherbeni, Atef Z.

doi:10.1109/tap.2015.2447004

Cited by 81 publications

(46 citation statements)

References 16 publications

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“…The focusing capability of the constructed reflectarray has been experimentally verified, showing a measured 3 dB relative bandwidth of 23.3% for the TE polarization spanning from 0.91 to 1.15 THz, and 23.9% for the TM polarization ranging from 0.92 to 1.17 THz. The reflectarray bandwidth can be further enhanced independently of the resonant element by employing a phase synthesis approach . The constructed reflectarray can also transform an incident spherical wave into a collimated beam in accordance with the reciprocity theorem.…”

Section: Resultsmentioning

confidence: 99%

Terahertz Reflectarray with Enhanced Bandwidth

You

Ako

Lee

et al. 2019

Advanced Optical Materials

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Reflectarrays offer unique potential for beamforming at terahertz frequencies as they combine the advantages of low‐profile of phased arrays and high‐efficiency of parabolic antennas. However, one challenge associated with reflectarrays is their bandwidth limitation resulting from the nonlinear phase response. To enhance bandwidth, a single‐layer stub‐loaded resonator is proposed for constructing reflectarrays. This resonator design shows a smooth and near‐linear phase response with a complete 360° phase coverage at and around the design frequency. To demonstrate its capability in realizing beamforming, a focusing reflectarray is then constructed using the proposed resonator as a building block. The measured results reveal that the 3 dB relative bandwidths of the reflectarray for the transverse electric (TE)‐ and transverse magnetic (TM)‐polarized excitations are 23.3% and 23.9%, respectively, while retaining an efficiency of 71.9% for the TE polarization and 71.0% for the TM polarization at the center frequency of 1.00 THz. The simulation bandwidth of this proposed focusing reflectarray is over twice that of an existing dielectric resonator reflectarray. The proposed resonator has a potential to enhance the bandwidth of terahertz reflectarrays for various beamforming functions.

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Section: Resultsmentioning

confidence: 99%

Terahertz Reflectarray with Enhanced Bandwidth

You

Ako

Lee

et al. 2019

Advanced Optical Materials

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“…where φ R is the phase of the reflection coefficient of the antenna element i, k 0 is the phase constant in vacuum, (x i , y i ) are the coordinates of the array element i , d i is the distance from the phase centre of the feed to the antenna unit cell, (θ b , ϕ b ) are the expected scan angles of the beam in spherical coordinates and ∆ph is the additional reference phase. It is shown in [27] that the bandwidth of the reflectarray can be improved by introducing this additional reference phase, but in this study, the additional reference phase is used to suppress the cross polarization components of the reflectarray.…”

Section: B Cross Polarization Suppression Technique To Improve the Bmentioning

confidence: 99%

Multibeam Dual-Circularly Polarized Reflectarray for Connected and Autonomous Vehicles

Luo

Gao

et al. 2019

IEEE Trans. Veh. Technol.

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“…In order to compensate the differential spatial phase delay caused by different paths from the feed to different elements, true-time-delay techniques are used in [10], [11]. Besides these methods, a phase synthesis approach is developed to increase bandwidth independent of the element frequency behavior [12].…”

Section: Introductionmentioning

confidence: 99%

An Efficiency-Improved Tightly Coupled Dipole Reflectarray Antenna Using Variant-Coupling-Capacitance Method

et al. 2020

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In this paper, a tightly coupled dipole reflectarray antenna as well as a variant-couplingcapacitance method to improve the antenna aperture efficiency is presented. Tightly coupled elements and true-time-delay lines are employed in the design of a wideband reflectarray. The proposed reflectarray can operate from 2 GHz to 5 GHz with the gain varying from 11.3 dBi to 21 dBi. Moreover, we propose a variant-coupling-capacitance method to improve the reflectarray aperture efficiency at lower frequency. By changing the coupling capacitance between neighboring elements according to their positions in the reflecting surface, a more linear equivalent distance delay line is achieved. Hence, phase error is reduced. According to measurement, the reflectarray gain in 2 GHz using the proposed method is increased by 3 dBi compared with the previous design. Aperture efficiency in 2 GHz is improved by 21.6%. INDEX TERMS Reflectarray, tightly coupled antenna, wideband, variant coupling capacitance.

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A Novel Phase Synthesis Approach for Wideband Reflectarray Design

Cited by 81 publications

References 16 publications

Terahertz Reflectarray with Enhanced Bandwidth

Terahertz Reflectarray with Enhanced Bandwidth

Multibeam Dual-Circularly Polarized Reflectarray for Connected and Autonomous Vehicles

An Efficiency-Improved Tightly Coupled Dipole Reflectarray Antenna Using Variant-Coupling-Capacitance Method

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