Fresnel Lens at Millimeter-Wave: Enhancement of Efficiency and Radiation Frequency Bandwidth

Barka, André; Himdi, Mohamed; Lafond, Olivier

doi:10.1109/tap.2017.2755120

Cited by 12 publications

(23 citation statements)

References 25 publications

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“…Lens design criteria for the focusing devotions can be classified into two modes of illumination: transmission and reflection modes. The essential devices of each focusing setup are assigned to two central parts that can achieve them in all pieces of literature 1 – 19 with specific names: a lens device (focusing provider) and an illuminator/feeder/wave-launcher. Generally, all classes of lens devices for wave-focusing setup are independent of electromagnetic spectrums, and they have had their treatment scenarios and produce predetermined sub-zone permittivity techniques.…”

Section: Permittivity Control With Materials Porosity Methods For Zp Zomentioning

confidence: 99%

“…Therefore, we can verify that any asymmetrical zone plate’s radiation is due to permittivity estimation errors in the homogeneous design principles. To achieve this goal, an axially symmetric feed 6 or uniform feed 15 , 19 based on the 15 , 19 feed analysis is considered.…”

Section: Permittivity Control With Materials Porosity Methods For Zp Zomentioning

confidence: 99%

Section: Permittivity Control With Materials Porosity Methods For Zp Zomentioning

confidence: 99%

“…In millimeter-wave band over 30 GHz, the fabrication of illuminators that uniformly 15 , 19 or axially symmetric form illuminates 6 the lens surface to obtain an intended efficiency is difficult 19 . For this reason, amplitude tapering must be considered for illumination of lens feed to obtain the desired efficiency for proposed lenses based on 15 , 19 feed analysis. To accomplish this goal, two crucial factors are considered based on Kildal feed analysis, and approximations in 15 : the taper efficiency ( ) and the spill-over efficiency ( ) 15 , 19 .…”

Section: Permittivity Control With Materials Porosity Methods For Zp Zomentioning

confidence: 99%

“…For this reason, amplitude tapering must be considered for illumination of lens feed to obtain the desired efficiency for proposed lenses based on 15 , 19 feed analysis. To accomplish this goal, two crucial factors are considered based on Kildal feed analysis, and approximations in 15 : the taper efficiency ( ) and the spill-over efficiency ( ) 15 , 19 . In the classic design of Fresnel zone plates, horn antennas are employed as an illuminator to feed the zone plates, the radiation pattern of the lens feeder serves a cos n -like function 6 , 15 , 19 .…”

Section: Permittivity Control With Materials Porosity Methods For Zp Zomentioning

confidence: 99%

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Towards Millimeter-wavelength: Transmission-Mode Fresnel-Zone Plate Lens Antennas using Plastic Material Porosity Control in Homogeneous Medium

Pourahmadazar

Denidni

2018

Sci Rep

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We present two transmission-mode dielectric Fresnel-Zone Plate Lens (FZPL) antennas for use within the V-band spectrum. The proposed FZPs are realized via pure plastic material using two different additive manufacturing processes. The proposed FZP lenses are designed with half (λ/2) and quarter (λ/4) phase correction rings at 60-GHz with 30λ0 diameter, where λ0 is the free-space wavelength. The permittivity effect for lens sub-zones is controlled by material porosity in cube-shaped structures. The 3D printed zone plate lenses are built using additive manufacturing plastic materials with a thickness of λ0 and constant relative permittivities equal to 2.76 and 3.6. Different types of antenna with cosn-like radiation patterns as lens illuminators are analyzed on the vertical plane of the flat lenses to have a high efficiency over the considered operating band. Simulations and experimental measurements show a reasonably close match, therefore allowing for a reliable predictability.

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Section: Permittivity Control With Materials Porosity Methods For Zp Zomentioning

confidence: 99%

Section: Permittivity Control With Materials Porosity Methods For Zp Zomentioning

confidence: 99%

Section: Permittivity Control With Materials Porosity Methods For Zp Zomentioning

confidence: 99%

Section: Permittivity Control With Materials Porosity Methods For Zp Zomentioning

confidence: 99%

Section: Permittivity Control With Materials Porosity Methods For Zp Zomentioning

confidence: 99%

See 3 more Smart Citations

Towards Millimeter-wavelength: Transmission-Mode Fresnel-Zone Plate Lens Antennas using Plastic Material Porosity Control in Homogeneous Medium

Pourahmadazar

Denidni

2018

Sci Rep

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Porous Low‐Loss Silica–PMMA Dielectric Nanocomposite for High‐Frequency Bullet Lens Applications

Pálvölgyi

Kokkonen

Śliz

et al. 2023

Advanced Photonics Research

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Several devices of the future generation wireless telecommunication technologies that use bands in THz frequencies for data transmission need low‐loss and low‐permittivity materials to enable ideal conditions for the propagation of electromagnetic waves. Herein, a lightweight dielectric bullet‐shaped lens operating in the frequency range of 110–170 GHz is demonstrated to collimate electromagnetic waves, thus increasing the intensity of the electric field. The material of the lens is based on a composite of silica nanoshells and poly(methylmethacrylate) made by the impregnation of the nanoshells with the polymer followed by hot pressing in a mold. As the polymer acts only as an adhesive between the hollow nanospheres without filling the inner cavity of the shells and their interparticle spaces, the composite is highly porous (67%) and has low dielectric permittivity and loss tangent (1.5 and 4 × 10−3, respectively, below 200 GHz). The size of the collimated beam and the increase of the corresponding field strength are measured to vary from 2.2 to 1.2 mm and from 17.2 to 8.98 dB depending on the frequency of the waves (110–170 GHz).

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Quasioptical Fresnel-based lens antenna with frequency-steerable focal length for millimeter wave radars

Muckermann,

Barowski,

Pohl

2023

Int. J. Microw. Wireless Technol.

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This article presents the design of a dielectric lens antenna that utilizes the concept of a stepped Fresnel lens for focusing electromagnetic millimeter waves. Based on the quasi-optical properties of these waves, a Cartesian Oval is optimized and employed as a focusing lens. Multiple such lenses are combined to two different Fresnel-based lens antennas. We survey these newly designed lens antennas and compare them with a focusing lens antenna based on a Cartesian oval and a far-field lens antenna. Simulations and measurements with a frequency-modulated continuous-wave (FMCW) radar validate the effectiveness of the new design, demonstrating an even improved focus size while significantly reducing the size and weight of the lens antenna by up to 53% and by nearly 48 %, respectively. Additionally, the Fresnel-based lens antennas reveal a frequency dependency, enabling frequency-based steering of the focal length over a wide relative tuning range of 177%, which we thoroughly investigate for various bandwidths and center frequencies.

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Fresnel Lens at Millimeter-Wave: Enhancement of Efficiency and Radiation Frequency Bandwidth

Cited by 12 publications

References 25 publications

Towards Millimeter-wavelength: Transmission-Mode Fresnel-Zone Plate Lens Antennas using Plastic Material Porosity Control in Homogeneous Medium

Towards Millimeter-wavelength: Transmission-Mode Fresnel-Zone Plate Lens Antennas using Plastic Material Porosity Control in Homogeneous Medium

Porous Low‐Loss Silica–PMMA Dielectric Nanocomposite for High‐Frequency Bullet Lens Applications

Quasioptical Fresnel-based lens antenna with frequency-steerable focal length for millimeter wave radars

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