Reconfigurable Transmitarray Design Approaches for Beamforming Applications

Lau, Jonathan Y.; Hum, Sean V.

doi:10.1109/tap.2012.2213054

Cited by 176 publications

(75 citation statements)

References 18 publications

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“…The equivalent reactance of the layer can be changed by proper commutation of the diodes within the cells. The different reactances of the layer assure the different phase shifts introduced in the plane wave transmitted through the layer [1]. Thus, it is possible to add a linearly-distributed phase shift across the incident plane wave and to redirect it in a desired direction [2].…”

Section: Introductionmentioning

confidence: 99%

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Boundary Value Problem of an Infinite Array of Loaded Apertures

Iturri-Hinojosa

Martynyuk

Badaoui

2015

IFSL

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Abstract. A mathematical model of the scattering by a periodically arranged apertures in conducting plates is presented. The boundary value problem of an infinite array of loaded apertures is formulated for an arbitrary incident plane wave. The reflection coefficient for some array geometries is obtained and the calculated values are in good agreement with the measurements in a previously published researches. All the rectangular apertures in the array are assumed to be identical and infinitesimally thin. The mathematical model is based on Floquet's theorem that specifies the requirement of periodicity by the electromagnetic fields.

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Section: Introductionmentioning

confidence: 99%

“…If the biases across all p-i-n diodes are the same for all the cells in the layer, this layer can be analyzed as a periodic structure using the theorem of Floquet [1][2][3]. The small cell is considered as a unit cell of this periodic structure.…”

Section: Introductionmentioning

confidence: 99%

Boundary Value Problem of an Infinite Array of Loaded Apertures

Iturri-Hinojosa

Martynyuk

Badaoui

2015

IFSL

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“…However, in the real case the incident wave on the elements at the array edges has an angle different from the normal (which is an approximation). Many transmitarray researches had been proposed using different antenna elements for different applications [11][12][13]. In this paper, circularly polarized graphene based transmitarray at f = 6 THz is designed.…”

Section: Introductionmentioning

confidence: 99%

Graphene Based Transmitarray for Terahertz Applications

Malhat¹,

Zainud-Deen²,

Gaber³

2014

PIER M

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Abstract-Circularly polarized graphene based transmitarray for terahertz applications is proposed. The characteristics of the graphene material is explained. The cell element of the transmitarray is made of square Quartz cell. Dual circular graphene rings are printed on both sides of the Quartz substrate. The graphene ring radius is varied to change the transmission coefficient phase and magnitude. The effect of the graphene chemical potential on the transmission coefficient is demonstrated. Transmitarray is composed of 9 × 9 unit cell elements. A circularly polarized circular horn is used to feed the transmitarray at f = 6 THz. The left-and right-hand field components in the E-and H-plane are determined. The variation of the gain and the axial-ratio with the frequency are explained. The peak gain is 18.63 dB and 1-dB gain bandwidth is 6.8%. The transmitarray produces a circular polarization from 5.5 THz to 6.5 THz.

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“…A few examples include using liquid crystals [5], as well as using varactor diode-tuned cells [6]. This paper focuses on the use of a varactor diode-tuned array lens [7], which will be used as a focal plane feed. Using this setup, each element in the array lens is transmissive with a tunable phase shift [7].…”

Section: Introductionmentioning

confidence: 99%

“…This paper focuses on the use of a varactor diode-tuned array lens [7], which will be used as a focal plane feed. Using this setup, each element in the array lens is transmissive with a tunable phase shift [7]. By varying the voltages across varactor diodes within the array lens elements, the desired phase shifts can be achieved.…”

Section: Introductionmentioning

confidence: 99%

Analysis of reflectors fed by reconfigurable array lenses

Kocia

Hum

2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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Array lenses are growing in popularity for their ability to potentially create reconfigurable beam patterns. Of particular interest is their possible application to satellite communications as they can provide reconfigurable high-gain beam forming at a low cost. This paper analyzes a high-gain compound aperture consisting of a parabolic reflector and a 6 × 6 reconfigurable array lens. Applying conjugate field matching, the optimal element phases are found and used to configure simulated array lens models for generating the reflector illumination. Simulating the reflector using physical optics, it is found that high-gain pencil beams can be formed and scanned up to 8 • away from the reflector axis. A compound system is constructed using a prototype reconfigurable array lens and a parabolic reflector, and beam scanning from −5 • to +5 • off-boresight is experimentally demonstrated.

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Reconfigurable Transmitarray Design Approaches for Beamforming Applications

Cited by 176 publications

References 18 publications

Boundary Value Problem of an Infinite Array of Loaded Apertures

Boundary Value Problem of an Infinite Array of Loaded Apertures

Graphene Based Transmitarray for Terahertz Applications

Analysis of reflectors fed by reconfigurable array lenses

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