Reflectarray antennas for space applications

Elsherbeni, Atef Z.; Nayeri, Payam; Yang, Fan

doi:10.1109/icuwb.2012.6340389

Cited by 9 publications

(5 citation statements)

References 15 publications

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“…The authors in [6] extended the said path loss model to arbitrary incident angles and polarizations, but considered the far-field zone of the IRS. Recently, a stream of papers (e.g., [7], [8], and references therein) proposed a path loss model that is applicable to nearfield, using the "cos q " radiation pattern [9] for each IRS element, which differs from the plate scattering-based model.…”

Section: Introductionmentioning

confidence: 99%

Intelligent Reflecting Surfaces at Terahertz Bands: Channel Modeling and Analysis

Dovelos

Assimonis

Ngo

et al. 2021

2021 IEEE International Conference on Communications Workshops (ICC Workshops)

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An intelligent reflecting surface (IRS) at terahertz (THz) bands is expected to have a massive number of reflecting elements to compensate for the severe propagation losses. However, as the IRS size grows, the conventional far-field assumption starts becoming invalid and the spherical wavefront of the radiated waves should be taken into account. In this work, we consider a spherical wave channel model and pursue a comprehensive study of IRS-aided multiple-input multiple-output (MIMO) in terms of power gain and energy efficiency (EE). Specifically, we first analyze the power gain under beamfocusing and beamforming, and show that the latter is suboptimal even for multiple meters away from the IRS. To this end, we derive an approximate, yet accurate, closed-form expression for the loss in the power gain under beamforming. Building on the derived model, we next show that an IRS can significantly improve the EE of MIMO when it operates in the radiating near-field and performs beamfocusing. Numerical results corroborate our analysis and provide novel insights into the design and performance of IRSassisted THz communication.

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Section: Introductionmentioning

confidence: 99%

Intelligent Reflecting Surfaces at Terahertz Bands: Channel Modeling and Analysis

Dovelos

Assimonis

Ngo

et al. 2021

2021 IEEE International Conference on Communications Workshops (ICC Workshops)

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“…in which ε cd is defined as the radiation efficiency (governed by intrinsic material losses, such as dielectric and conduction losses), ε p as phase efficiency and ε b is the blockage efficiency, respectively. In this paper, we ignore the intrinsic material losses and assume a point source to illuminate the IRS aperture, the aperture efficiency of a reflecting surface is mainly dominated by spillover efficiency (ε s ) and taper efficiency (ε t ) and the rest of efficiencies are assumed to be ideal (equal to 1) [14]. Thus, the aperture efficiency can be rewritten as…”

Section: Efficiency Of Rectangular Irsmentioning

confidence: 99%

On the Aperture Efficiency of Intelligent Reflecting Surfaces

Chou

Yurduseven

Ngo

et al. 2021

IEEE Wireless Commun. Lett.

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The concept of intelligent reflecting surfaces (IRS) has recently gained significant attention due to their ability to manipulate the impinging electromagnetic signals and offer anomalous reflections. In this letter, we derive and address the missing piece of prior works, namely the IRS aperture efficiency. Our work provides practical guidelines for selecting the aperture size of the reflecting surface from an antenna designing point of view by taking tapering level into account, and also, revisits the pathloss expression based on a realistic physical model.

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“…This is accomplished by changing the distance, R i , between the unit-cells and the feed antenna phase center. Proposed approaches include single feed systems that mechanically tune R i [48]- [51], or multiple feed systems that create discrete values of R i [52]- [54]. Multiple feed systems are not well suited for SmallSat applications since they add significant mass to the spacecraft and require individual feed networks and complicated deployment mechanisms.…”

Section: Introductionmentioning

confidence: 99%

A Mechanically Rollable Reflectarray With Beam-Scanning Capabilities

Rubio

Kaddour

Georgakopoulos

2022

IEEE Open J. Antennas Propag.

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A novel 1-D beam-steerable reflectarray antenna (RA) is proposed for the K u -band. The RA aperture consists of 24×48 variable size square patch elements printed on a flexible plastic substrate. The aperture is wrapped around two cylinders to create a 12λ×12λ illumination window at the operating frequency of 14 GHz. Beam-steering is achieved by mechanically rolling the aperture. To mitigate antenna pattern degradation, an aperture phase distribution optimization technique is presented. The performance of this RA system is studied analytically using array theory. The effects of aperture size and unit-cell size are also discussed. The performance of the proposed RA is validated using simulations and measurements. The results illustrate that our design achieves 1-D beam-steering from -21 • to +21 • in the elevation plane while maintaining towards the broadside direction a maximum realized gain of 25.1 dBi. In this beamscanning range, the gain variation is less than 1.5 dB, beamwidth variation is less than 1.6 • , and the side lobe level is maintained below -15 dB. In summary, the main advantage of our design is its ability to steer its high gain beam without using complicated feed networks or complex mechanical systems. Such antennas are especially needed in SmallSat and space applications.

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Reflectarray antennas for space applications

Cited by 9 publications

References 15 publications

Intelligent Reflecting Surfaces at Terahertz Bands: Channel Modeling and Analysis

Intelligent Reflecting Surfaces at Terahertz Bands: Channel Modeling and Analysis

On the Aperture Efficiency of Intelligent Reflecting Surfaces

A Mechanically Rollable Reflectarray With Beam-Scanning Capabilities

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