Ultra-Wideband, True-Time-Delay Reflectarray Antennas Using Ground-Plane-Backed, Miniaturized-Element Frequency Selective Surfaces

Abadi, Seyed Mohamad Amin Momeni Hasan; Ghaemi, Kasra; Behdad, Nader

doi:10.1109/tap.2014.2381231

Cited by 90 publications

(14 citation statements)

References 30 publications

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“…Reflectarray (RA) antennas are a new generation of high-gain antennas thanks to their distinguishable electrical and mechanical characteristics. RA antennas combine merits of both reflectors and printed arrays as well as offering alternative design with low profile and low mass features [1], [2].In comparison with reflector antennas, RA antennas are easy to manufacture and install due to their flat structures. Compared with printed arrays, RA antennas eliminate the loss from feedline networks and phase adjustment networks as reflectarray has usually one feed antenna, and the elements embed phase altering structures to achieve plane wave on the aperture surface [3].…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…The concept of reflectarray was first demonstrated using an array of short-circuited square waveguides and the desired phase profile was obtained by adjusting the length of each waveguide in the array 11 . Since the first demonstration, there have been many efforts to increase the performance of reflectarrays by implementing various types of phase manipulating elements, including variable delay lines 12 , frequency selective surfaces 13 , and metasurfaces 14,15 . Many of these demonstrations are focused on enabling broadband and polarization independent radiation at the price of using multi-layers 16,17 or thick substrates 18 , making them bulky for small satellite applications.…”

Section: Introductionmentioning

confidence: 99%

Metasurface-based ultra-lightweight high-gain off-axis flat parabolic reflectarray for microwave beam collimation/focusing

Silva

Rahman

Kort-Kamp

et al. 2019

Sci Rep

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Ultra-lightweight deployable antennas with high-gain are pivotal communication components for small satellites, which are intrinsically constrained in size, weight, and power. In this work, we design and demonstrate metasurface-based ultra-lightweight flat off-axis reflectarrays for microwave beam collimation and focusing, similar to a parabolic dish-antenna. Our ultra-thin reflectarrays employ resonators of variable sizes to cover the full 2π phase range, and are arranged on the metasurface to realize a two-dimensional parabolic focusing phase distribution. We demonstrate a 30° off-axis focusing reflector that exhibits a measured gain of 27.5 dB at the central operating frequency of 11.8 GHz and a 3 dB directionality <1.6°. Furthermore, we carry out full-wave simulations of the reflectarray, showing high gain of the beam focusing/collimation functionality, in good agreement with measurements. The demonstrated reflectarrays will enable low-cost, lightweight, and high-gain deployable transceivers for small-satellite platforms.

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“…When the dimension of the element is very small, the sample interval on the array is approximately continuous, which makes the element exhibit remarkable characteristics of high phase‐adjusting precision and low sensitivity to the incidence angle. Therefore, the array with subwavelength elements obtains the advantages of feed image lobe reduction, beam‐steering angle range improvement [1], aperture efficiency enhancement, and holographic image quality advancement. Furthermore, multiple subwavelength elements could be integrated into one multi‐resonant element to increase the operating bandwidth of the array [2].…”

Section: Introductionmentioning

confidence: 99%

Subwavelength and low‐profile element using metallic hole for reflected antenna array

Hou

Zhang

2019

Electron. lett.

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In this Letter, a novel subwavelength and low-profile element is proposed for the reflected antenna array applications. By using the metallic hole, the proposed element achieves a smaller dimension with the period of 0.1125 wavelength and the profile of 0.036 wavelength at the centre frequency of 13.5 GHz. The element obtains a wide reflected phase shifting range of 337.2°in such a small dimension. The reflected magnitude and phase are less sensitive to the incidence angle over a large range from +60°to −60°. To verify the function of the proposed element with a metallic hole, a reflected antenna array with 2724 elements is designed, fabricated, and measured. The array achieves a maximum peak gain of 23.30 dBi at 13.25 GHz with a high aperture efficiency of 61.05%.

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Ultra-Wideband, True-Time-Delay Reflectarray Antennas Using Ground-Plane-Backed, Miniaturized-Element Frequency Selective Surfaces

Cited by 90 publications

References 30 publications

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

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

Metasurface-based ultra-lightweight high-gain off-axis flat parabolic reflectarray for microwave beam collimation/focusing

Subwavelength and low‐profile element using metallic hole for reflected antenna array

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