Optically‐controlled solid‐state plasma leaky‐wave antenna

Grewal, Gurvikram; Hanson, George W.

doi:10.1002/mop.11245

Cited by 14 publications

(5 citation statements)

References 16 publications

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“…Inability to fabricate these materials over large area and weak modulation of dielectric properties prevents realization of adaptive microwave surfaces. Another approach is to use distributed active circuit elements (diodes, transistors or photoswitches) integrated with passive metallic structures 33,34 . External bias voltage or light source applied on these distributed circuit elements changes the effective length of metallic structures, which yield limited control over the reflectivity of the surface.…”

mentioning

confidence: 99%

Graphene-enabled electrically switchable radar-absorbing surfaces

et al. 2015

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Radar-absorbing materials are used in stealth technologies for concealment of an object from radar detection. Resistive and/or magnetic composite materials are used to reduce the backscattered microwave signals. Inability to control electrical properties of these materials, however, hinders the realization of active camouflage systems. Here, using large-area graphene electrodes, we demonstrate active surfaces that enable electrical control of reflection, transmission and absorption of microwaves. Instead of tuning bulk material property, our strategy relies on electrostatic tuning of the charge density on an atomically thin electrode, which operates as a tunable metal in microwave frequencies. Notably, we report large-area adaptive radar-absorbing surfaces with tunable reflection suppression ratio up to 50 dB with operation voltages o5 V. Using the developed surfaces, we demonstrate various device architectures including pixelated and curved surfaces. Our results provide a significant step in realization of active camouflage systems in microwave frequencies.

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confidence: 99%

Graphene-enabled electrically switchable radar-absorbing surfaces

et al. 2015

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“…Recently, there has been a growing interest in the use of plasma discharges [3][4][5][6][7] as passive or active antenna elements because the latter have potential advantages over conventional metallic antennas. Most notably, plasma discharges can be employed to build reconfigurable structures with low radar cross section.…”

Section: Introductionmentioning

confidence: 99%

“…In [6], the Authors proposed a leaky-wave antenna based on a plasma layer generated in a silicon substrate, and showed that scanning of the beam can be obtained by controlling the plasma density. The antenna under study in this paper differs for the nature of the plasma -gaseous versus solid-state -and for the geometry -fully 3-D versus planar.…”

Section: Introductionmentioning

confidence: 99%

Beam-Forming and Beam-Steering Capabilities of a Reconfigurable Plasma Antenna Array

Olvera¹,

Melazzi²,

Lancellotti³

2016

PIER C

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Abstract-We present the numerical parametric study of a reconfigurable plasma antenna array (PAA) composed of a metallic half-wavelength dipole and a set of cylindrical plasma discharges arranged in a planar square lattice. Our results, obtained with the linear embedding via Green's operators (LEGO) method, indicate that beam-forming and beam-steering functionality can be achieved and controlled by appropriately choosing the number and position of the active plasma discharges around the dipole. Furthermore, we show that an external static magnetic field and the plasma density have a noticeable effect on the radiation pattern of the antenna.

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“…Electronic switches were used by Li and Long in a multiport microstrip LWA . Simpler configurations where the fixed‐frequency beam steering is an inherent property of the antenna have been proposed . In particular, in , Maheri et al obtained a steerable corrugated ferrite LWA by varying the DC magnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…Periodical photo‐induced solid‐state plasma is generated by Matsumoto et al in a semiconductor slab to tune the radiation . Also, Grewal and Hanson proposed a uniform solid‐state plasma antenna in to control leaky‐waves by optical illumination at 94 GHz. In our study, we propose the use of plasma discharge as a new technology for a tunable LWA.…”

Section: Introductionmentioning

confidence: 99%

Leaky‐wave plasma antenna with tunable radiation angle

Kallel

Sokoloff

Callegari

2014

Micro & Optical Tech Letters

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A beam scanning leaky‐wave antenna working at a fixed operating frequency and based on plasma discharge is proposed. The investigation of leaky‐poles for the proposed geometry shows that, at a fixed frequency, the radiation angle scans from broadside toward endfire by varying the plasma density in a relevant range. Theoretical results demonstrate that, at 10 GHz, this antenna may produce a beam scanning from 1.6 to 74.7° by varying the plasma density from 1.243 × 1012 cm−3 to 4.7 ×1010 cm−3. Measurement results of the plasma characteristics performed on a radiofrequency plasma source in our laboratory are also discussed. Their integration in full‐wave simulations confirms the excitation of leaky‐waves. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2601–2604, 2014

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Optically‐controlled solid‐state plasma leaky‐wave antenna

Cited by 14 publications

References 16 publications

Graphene-enabled electrically switchable radar-absorbing surfaces

Graphene-enabled electrically switchable radar-absorbing surfaces

Beam-Forming and Beam-Steering Capabilities of a Reconfigurable Plasma Antenna Array

Leaky‐wave plasma antenna with tunable radiation angle

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