Demonstration of Broadband Reflectarray Using Unit Cells With Spline-Shaped Geometry

Karimipour, Majid; Aryanian, Iman

doi:10.1109/tap.2019.2902747

Cited by 20 publications

(20 citation statements)

References 31 publications

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“…A wide reflection phase (S 11 phase) range of unit cell element ensures a good bandwidth performance. The substrate of the unit cells can be used as stacked layers, or an air gap can be inserted in it before the ground plane to cope with the narrow bandwidth issue [12][13][14]. However, this could increase the design efforts and make it difficult to be fabricated, especially at millimeter wave frequencies.…”

Section: Introductionmentioning

confidence: 99%

A Novel Asymmetric Patch Reflectarray Antenna with Ground Ring Slots for 5G Communication Systems

et al. 2020

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The narrow bandwidth and low gain performances of a reflectarray are generally improved at the cost of high design complexity, which is not a good sign for high-frequency operation. A dual resonance asymmetric patch reflectarray antenna with a single layer is proposed in this work for 5G communication at 26 GHz. The asymmetric patch is developed from a square patch by tilting its one vertical side by a carefully optimized inclination angle. A progressive phase range of 650° is acquired by embedding a circular ring slot in the ground plane of the proposed element for gain improvement. A 332-element, center feed reflectarray is designed and tested, where its high cross polarization is suppressed by mirroring the orientation of asymmetric patches on its surface. The asymmetric patch reflectarray offers a 3 dB gain bandwidth of 3 GHz, which is 4.6% wider than the square patch reflectarray. A maximum measured gain of 24.4 dB has been achieved with an additional feature of dual linear polarization. Simple design with wide bandwidth and high-gain of asymmetric patch reflectarray make it suitable to be used in 5G communications at high frequencies.

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Section: Introductionmentioning

confidence: 99%

A Novel Asymmetric Patch Reflectarray Antenna with Ground Ring Slots for 5G Communication Systems

et al. 2020

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“…Despite many potentials, the main shortcomings of a reflectarray antenna are its limited bandwidth and high loss performance as compared to the parabolic reflector antennas [9][10][11]. Researchers have proposed a number of configurations in the past few years for the bandwidth and loss performance improvement of reflectarrays [12][13][14][15][16]. However, considerable efforts are still required to improve the bandwidth performance of reflectarrays.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Reflectarray Antenna: A Comparison between Design Using PIN Diodes and Liquid Crystals

Abbasi

Ismail

Kamarudin

et al. 2021

Wireless Communications and Mobile Computing

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This work presents the design and analysis of active reflectarray antennas with slot embedded patch element configurations within an X -band frequency range. Two active reflectarray design technologies have been proposed by digital frequency switching using PIN diodes and analogue frequency tuning using liquid crystal-based substrates. A waveguide simulator has been used to perform scattering parameter measurements in order to practically compare the performance of reflectarray designed based on the two active design technologies. PIN diode-based active reflectarray unit cell design is shown to offer a frequency tunability of 0.36 GHz with a dynamic phase range of 226°. On the other hand, liquid crystal-based design provided slightly lower frequency tunability of 0.20 GHz with a dynamic phase range of 124°. Moreover, the higher reflection loss and slow frequency tuning are demonstrated to be the disadvantages of liquid crystal-based designs as compared to PIN diode-based active reflectarray designs.

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“…The associate editor coordinating the review of this manuscript and approving it for publication was Giorgio Montisci . multi-resonant elements [5], [6], multilayer elements [2], [7], spline shaped unit cell [8], and subwavelength element [9] are employed. 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].…”

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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Demonstration of Broadband Reflectarray Using Unit Cells With Spline-Shaped Geometry

Cited by 20 publications

References 31 publications

A Novel Asymmetric Patch Reflectarray Antenna with Ground Ring Slots for 5G Communication Systems

A Novel Asymmetric Patch Reflectarray Antenna with Ground Ring Slots for 5G Communication Systems

Reconfigurable Reflectarray Antenna: A Comparison between Design Using PIN Diodes and Liquid Crystals

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

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