Active Reflectors: Possible Solutions Based on Reflectarrays and Fresnel Reflectors

Cabria, L.; García, José Ángel García; Gutiérrez-Ríos, J.; Tazón, A.; Vassal'lo, J.

doi:10.1155/2009/653952

Cited by 17 publications

(7 citation statements)

References 15 publications

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“…Though this area is still growing, there have been several cross-polarized designs employing two-port phaseshifters in cascade with amplifiers connecting the two polarization ports of patch antennas. Experimental results employing phase shifters based on IQ modulators [87] and reflectionmode phase shifters [84] have been recently presented. Active array lens designs have also been proposed [88], though presently beam-forming is achieved by employing multiple feeds.…”

Section: E Active Reflectarraysmentioning

confidence: 99%

Reconfigurable Reflectarrays and Array Lenses for Dynamic Antenna Beam Control: A Review

Hum

Perruisseau‐Carrier

2014

IEEE Trans. Antennas Propagat.

748

413

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Abstract-Advances in reflectarrays and array lenses with electronic beam-forming capabilities are enabling a host of new possibilities for these high-performance, low-cost antenna architectures. This paper reviews enabling technologies and topologies of reconfigurable reflectarray and array lens designs, and surveys a range of experimental implementations and achievements that have been made in this area in recent years. The paper describes the fundamental design approaches employed in realizing reconfigurable designs, and explores advanced capabilities of these nascent architectures, such as multi-band operation, polarization manipulation, frequency agility, and amplification. Finally, the paper concludes by discussing future challenges and possibilities for these antennas.

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Section: E Active Reflectarraysmentioning

confidence: 99%

Reconfigurable Reflectarrays and Array Lenses for Dynamic Antenna Beam Control: A Review

Hum

Perruisseau‐Carrier

2014

IEEE Trans. Antennas Propagat.

748

413

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“…With respect to a PCR, an AR is smaller and lighter, but its reliability is often reduced by the need of a power source, usually a battery buffered by solar panels, and its phase stability demands careful design. Innovative concepts are currently under investigation based on the use of reflect arrays [ 23 ], but to the authors’ knowledge, until today, no operative applications to spaceborne radar interferometry have been proposed.…”

Section: Introductionmentioning

confidence: 99%

A Low-Cost Active Reflector for Interferometric Monitoring Based on Sentinel-1 SAR Images

Luzi

Espin-Lopez

Perez

et al. 2021

Sensors

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The effectiveness of radar interferometric techniques in non-urban areas can often be compromised due to the lack of stable natural targets. This drawback can be partially compensated through the installation of reference targets, characterized by a bright and stable radar response. The installation of passive corner reflectors (PCR) often represents a valid aid, but these objects are usually cumbersome, and suffer from severe weather conditions; furthermore, the installation of a PCR can be difficult and costly, especially in places with hard accessibility. Active reflectors (AR) represent a less cumbersome alternative to PCRs, while still providing a stable phase response. This paper describes the design, implementation, and test of an AR prototype, designed to operate with the Sentinel-1 synthetic aperture radar (SAR), aimed at providing a fair performance/cost benefit. These characteristics, obtained through a tradeoff between the use of off-the-shelf components and a simple architecture, can make the setup of a dense network (i.e., tens of devices) in the monitored areas feasible. The paper reports the design, implementation, and the analysis of different tests carried out in a laboratory, and in a real condition in the field, to illustrate AR reliability and estimate its phase stability.

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“…along z (assuming the source is at a fixed location). This displacement h can be electromechanically adjusted for realtime control over a range of [0, λ/2] to achieve full phase coverage of [0, 2π], considering the round-trip reflection path of the incident wave [6]. By adjusting the elevation h in small increments, any value of reflection phase may be achieved.…”

Section: Proposed Electromechanical Element Conceptmentioning

confidence: 99%

Concept of Independent Reflection Magnitude and Phase Using an Electromechanical Metasurface

Gupta¹,

MacDonell²,

Rufail³

2022

Preprint

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<p>A simple concept to perfectly decouple the reflection magnitude and phase of a reflective metasurface is proposed. For a linearly-polarized illumination, a full 2? phase is achieved in reflection by physically displacing the unit cell normal to the surface, with respect to a fixed reference and source, while the reflection magnitude is independently controlled via an integrated resistive element inside the unit cell. This proposed concept is demonstrated using full-wave simulations, which is the first step towards an electromechanical metasurface with truly independent real-time amplitude and phase control.</p>

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Active Reflectors: Possible Solutions Based on Reflectarrays and Fresnel Reflectors

Cited by 17 publications

References 15 publications

Reconfigurable Reflectarrays and Array Lenses for Dynamic Antenna Beam Control: A Review

Reconfigurable Reflectarrays and Array Lenses for Dynamic Antenna Beam Control: A Review

A Low-Cost Active Reflector for Interferometric Monitoring Based on Sentinel-1 SAR Images

Concept of Independent Reflection Magnitude and Phase Using an Electromechanical Metasurface

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