Comparative Design and Analysis of Luneburg and Half Maxwell Fish-Eye Lens Antennas

Fuchs, Benjamin; Lafond, Olivier; Palud, Sébastien; Coq, Laurent Le; Himdi, Mohamed; Buck, M.; Rondineau, S.

doi:10.1109/tap.2008.928818

Cited by 60 publications

(31 citation statements)

References 13 publications

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“…The new pressed foam density is given by: (5) Secondly, as mentioned in [10], knowing the volume ratio, we can calculate the effective relative dielectric constant of pressed foam by (6): (6) Where V g and V p are the volume of gas and polymer. In the reference [10], Plonus finds the volume ratio of gas to base polymer in the foam as a function of foam density and uses this to determine the dielectric constant of the foam.…”

Section: A Some Instances Of the Foams Usedmentioning

confidence: 99%

Technological Process to Control the Foam Dielectric Constant Application to Microwave Components and Antennas

Bor

Lafond

Merlet

et al. 2014

IEEE Trans. Compon., Packag. Manufact. Technol.

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Abstract-A technological process to control the foam dielectric constant, an important issue for the design of microwave components and antennas, is described. For that purpose, the use of different commercial foam materials has been considered. This kind of foam substrate is made of original material (PVC, resin, …) into which gas is injected. So the dielectric constant of such foam is close to 1. It can be increased by expelling the gas out of the foam material. The authors are presenting the technological process used to expel the gas by pressing a foam slab at relatively low temperature (90°C). Thanks to this technological process, the dielectric constant variation can be controlled by the ratio between the initial and final slab thickness. It holds a great interest for the design of microwave antennas and circuits. Indeed, the dielectric constant inside gradient index lenses (Luneburg, Maxwell fish-eye and Fresnel lenses) must follow a particular law to obtain the desired radiation capabilities. Results of materials characterization are presented to validate the technological process. Foam based antennas and components are also shown to illustrate the interest of the process.Index Terms-Foam material, controlled dielectric constant.

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Section: A Some Instances Of the Foams Usedmentioning

confidence: 99%

Technological Process to Control the Foam Dielectric Constant Application to Microwave Components and Antennas

Bor

Lafond

Merlet

et al. 2014

IEEE Trans. Compon., Packag. Manufact. Technol.

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“…This law induces a particular ray tracing into the lens ( Figure 1). The characteristic of this lens is to have infinity of focus points (contrary to Half-Maxwell fish-eye lenses for example [7]). In this paper, a flat lens is designed in order to focus the radiation pattern only in the H-plane.…”

Section: Reconstructed Index Law Inside the Luneburg Lensmentioning

confidence: 99%

“…Cross sectional view of a multi-shells lens [7] The different radii (r i ) and permittivities ( i ) of the areas are obtained with the following formulas [11]:…”

Section: Figurementioning

confidence: 99%

“…As described in [7], a similar study has been done using more areas but it would not increase the directivity significantly. The different optimized values of permittivity are respectively 1.05, 1.31, 1.46, 1.62, 1.77 and 1.92.…”

Section: Figurementioning

confidence: 99%

“…A printed technology is used in [3] but it cannot be extending to a three dimensional lens and efficiency is limited to 50% at 12GHz. Efficiency remains a problem while using metamaterials [4], for that purpose, [5], [6] and [7] used different homogeneous dielectric materials to manufacture inhomogeneous lenses but this technology is costly and air gaps can affect efficiency of the lens antenna. In [8,9], the permittivity distribution is controlled by the density of the holes in an homogeneous material but it requires a huge number of holes.…”

Section: Introductionmentioning

confidence: 99%

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Foam Based Luneburg Lens Antenna at 60 GHZ

Bor¹,

Lafond²,

Merlet³

et al. 2014

PIER Letters

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Abstract-An innovative technological process is investigated to easily manufacture inhomogeneous Luneburg lenses. A unique foam material is drilled and pressed to achieve the different dielectric constant needed to follow the index law inside the lens. The performance of such 60 GHz antenna is described and the antenna prototype is measured in terms of gain and radiation patterns. The results show a good efficiency (60% with a directivity of and demonstrate the feasibility of this kind of Luneburg lens, through the use of a simple technological process. The lens with a diameter of 56mm and a thickness of 3mm operates in the 57-66 GHz bandwidth. The magnitude of S11 parameter is under -10dB in the whole bandwidth and an half-power beamwidth of 5° and 50° in H-plane and E-plane respectively is reached.

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Metamaterial Lenses and Their Applications at Microwave Frequencies

Tang

Chen

Cui

2021

Advanced Photonics Research

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Metamaterials (MTMs) are artificial structures characterized by flexible and designable electromagnetic (EM) properties, including permittivity, permeability, and refractive index. Because of their subwavelength-scale composing units, MTMs are able to manipulate the propagation of EM waves at extremely fine resolutions and offer solutions for new-concept devices and components with novel functionalities and challenge-breaking properties. From among the attractive applications of MTMs, this review article focuses on MTM lenses (also termed metalenses) developed in recent years for the purpose of microwave engineering, including beam forming, beam steering, and imaging. Bulk lenses made of 3D MTMs and planar lenses made of 2D transmission-type metasurfaces are both involved and investigated. Different categories of metalenses, together with the theory, principles, methods, and advantages of their designs, are introduced and discussed. Potential and future applications of metalenses at microwave frequencies are also presented.

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Comparative Design and Analysis of Luneburg and Half Maxwell Fish-Eye Lens Antennas

Cited by 60 publications

References 13 publications

Technological Process to Control the Foam Dielectric Constant Application to Microwave Components and Antennas

Technological Process to Control the Foam Dielectric Constant Application to Microwave Components and Antennas

Foam Based Luneburg Lens Antenna at 60 GHZ

Metamaterial Lenses and Their Applications at Microwave Frequencies

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