Steering the Beam of Medium-to-High Gain Antennas Using Near-Field Phase Transformation

Afzal, Muhammad U.; Esselle, Karu P.

doi:10.1109/tap.2017.2670612

Cited by 191 publications

(104 citation statements)

References 26 publications

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“…In that case, as presented in [32], TE and TM modes are uncoupled in the principal planes φ = 0 • and φ = 90 • , and the dispersion equations are the one in (4). In all the other planes, B and T are not diagonal and TE and TM modes couple, pertaining to hybrid modes.…”

Section: B Diagonal Tensorial Impedance Sheetsmentioning

confidence: 95%

“…The original concept consists of a cavity created between a partially reflective surface (PRS) and a ground plane excited by a low directive source [1]. Since their introduction, FPAs have considerably evolved and numerous implementations can be found in literature showing gain enhancement capability [2], [3], beam steering [4], beam shaping [5]- [7], or even radar cross section reduction [8]. The ground plane may be replaced by a high impedance surface (HIS) to allow sidelobes reduction [9], profile reduction [10], [11], or higher control of the beam steering [12], [13] for instance.…”

Section: Introductionmentioning

confidence: 99%

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Circularly Polarized Fabry–Perot Antenna Using a Hybrid Leaky-Wave Mode

Calleau

Garcia-Vigueras

Legay

et al. 2019

IEEE Trans. Antennas Propagat.

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A spectral Green's function approach is developed here to analyze Fabry-Perot antennas for the generation of circular polarization. The structure consists of a single cavity, created between a partially reflective surface and a high impedance surface, fed by a low directive linearly polarized source. The elements in the antenna are characterized by tensor impedances. This frame allows to conceive a circularly polarized antenna supporting a single hybrid leaky-wave mode. By means of a residue analysis, it is demonstrated that the use of a single hybrid leaky mode is sufficient to generate circular polarization. The tool is validated by an antenna design matched over a relative bandwidth of 28.5% with an axial ratio lower than 3 dB.

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Section: B Diagonal Tensorial Impedance Sheetsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Circularly Polarized Fabry–Perot Antenna Using a Hybrid Leaky-Wave Mode

Calleau

Garcia-Vigueras

Legay

et al. 2019

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

show abstract

“…[12][13][14] In these structures, the main beam is pointed towards a fixed direction only and hence could not be considered as a beam steering configuration. This limitation of MS inspired structure was conquered by adopting passive movable configuration, [9][10][11] which in turn steered the direction of main beam. Still, the bulky nature make these structures less attractive.…”

Section: Introductionmentioning

confidence: 99%

Wideband beam-steerable configuration of metasurface loaded slot antenna

Katare

Biswas

Akhtar

2018

Int J RF Microw Comput Aided Eng

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In this article, a wideband two dimensional (2D) beam‐steerable antenna structure is presented. The proposed structure is based on a radially gradient hybrid metasurface (RGHMS) illuminated through a slot antenna. The half aperture of the RGHMS comprises of a gradient phase profile topology, while its other half aperture consists of a constant phase profile configuration. The slot antenna possessing the bidirectional radiation pattern is printed on a relatively thin substrate, which operates over a wide bandwidth of 1420 MHz (15.10%). The placement of RGHMS tilts the main beam of slot antenna by 15° away from normal direction. Further, in‐plane movement of MS provides beam steering in both elevation and azimuth planes, with a conical region of an apex angle of 30°. Apart from the beam steering capability, the placement of RGHMS in front of slot antenna also enhances the overall bandwidth and gain by 360 MHz and 5 dB, respectively. Thus, a wide band beam steering configuration with the impedance bandwidth of 1780 MHz (18.85%) is obtained. In order to investigate the frequency dependent beam tilting capability of the RGHMS in the elevation plane, a detailed analysis is carried out using the principle of refraction.

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“…The metasurface‐based beam steering configurations have been reported in refs. . However, these structures are bulky in nature due to their multilayer configuration or using dielectric lens antenna as a transmitting source .…”

Section: Introductionmentioning

confidence: 99%

“…. However, these structures are bulky in nature due to their multilayer configuration or using dielectric lens antenna as a transmitting source . The main beam was pointed in the specific direction by partially covering the antenna aperture using the superstrate of high refractive index material .…”

Section: Introductionmentioning

confidence: 99%

A compact configuration of semicircular metasurface loaded slot antenna for beam steering application

Katare

Chandravanshi²,

Biswas

et al. 2018

Int J RF Microw Comput Aided Eng

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In this article, a compact beam steering antenna configuration is presented. The proposed structure comprises a semicircular radially gradient metasurface (SCRGM) and a slot antenna. This metasurface (MS) with the dimensions of 3.17λ02 covers only half of the antenna aperture by placing it at a height of 0.16λ0 from the slot antenna. The SCRGM is made up of four different semicircular regions, which introduce progressive phase delay to the impinging spherical electromagnetic waves from the slot antenna. The placement of the SCRGM tilts the main beam by 30° away from the normal direction. Furthermore, in‐plane movement (rotation and translation) of the SCRGM facilitates beam steering in the elevation plane (E‐plane) with the total scanning range of 60°. Moreover, in simulation, two SCRGMs are placed at both sides of antenna aperture to independently control the beam directions in both upper and lower hemispheres of the slot antenna. Due to the symmetry of the slot antenna, only one SCRGM is tested during the measurement process and the same outcome is expected for the other MS. Considerably small volume (0.50λ03) of the structure revealed compact antenna configuration. Moreover, independent control of the beam directions in both of the hemispheres makes proposed antenna a suitable candidate for various applications.

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Steering the Beam of Medium-to-High Gain Antennas Using Near-Field Phase Transformation

Cited by 191 publications

References 26 publications

Circularly Polarized Fabry–Perot Antenna Using a Hybrid Leaky-Wave Mode

Circularly Polarized Fabry–Perot Antenna Using a Hybrid Leaky-Wave Mode

Wideband beam-steerable configuration of metasurface loaded slot antenna

A compact configuration of semicircular metasurface loaded slot antenna for beam steering application

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