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

Bor, Jonathan; Lafond, Olivier; Merlet, Herve; Bars, Philippe Le; Himdi, Mohamed

doi:10.1109/tcpmt.2013.2294871

Cited by 41 publications

(29 citation statements)

References 10 publications

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“…Multiple reflections are considered to be due to internal replications that might relate to the cell structure of the foams58. As is demonstrated in Fig.…”

Section: Resultsmentioning

confidence: 99%

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

Shao

et al. 2016

Sci Rep

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Sulfur (S) cross-linking styrene butadiene rubber (SBR) foams show high shrinkage due to the cure reversion, leading to reduced yield and increased processing cost. In this paper, double cross-linking system by S and dicumyl peroxide (DCP) was used to decrease the shrinkage of SBR foams. Most importantly, the synergy of double cross-linking agents was reported for the first time to our knowledge. The cell size and its distribution of SBR foams were investigated by FESEM images, which show the effect of DCP content on the cell structure of the SBR foams. The relationships between shrinkage and crystalline of SBR foams were analyzed by the synergy of double cross-linking agents, which were demonstrated by FTIR, Raman spectra, XRD, DSC and TGA. When the DCP content was 0.6 phr, the SBR foams exhibit excellent physical and mechanical properties such as low density (0.223 g/cm3), reduced shrinkage (2.25%) and compression set (10.96%), as well as elevated elongation at break (1.78 × 103%) and tear strength (54.63 N/mm). The results show that these properties are related to the double cross-linking system of SBR foams. Moreover, the double cross-linking SBR foams present high electromagnetic interference (EMI) shielding properties compared with the S cross-linking SBR foams.

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“…Multiple reflections are considered to be due to internal replications that might relate to the cell structure of the foams58. As is demonstrated in Fig.…”

Section: Resultsmentioning

confidence: 99%

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

Shao

et al. 2016

Sci Rep

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“…In fact, when the pressure increases and the foam is compacted, the quantity of air in the material decreases increasing the permittivity. This technique has been tested for the fabrication of a Luneburg lens in (Bor 2014). It is also possible to control the dielectric constant in the Luneburg lens by drilling holes into the material and varying either the diameter of the holes or their density (Sato 2002;Xue 2007).…”

Section: Non-uniform Index Spherical Lensesmentioning

confidence: 99%

Dielectric Lens Antennas

Fernandes¹,

Lima²,

Costa³

2015

Handbook of Antenna Technologies

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Dielectric lens antennas are attracting a renewed interest for millimetre-and submillimetre wave applications where they become compact, especially for configurations with integrated feeds usually referred as integrated lens antennas. Lenses are very flexible and simple to design and fabricate, being a reliable alternative at these frequencies to reflector antennas. Lens target output can range from a simple collimated beam (increasing the feed directivity) to more complex multi-objective specifications.This chapter presents a review of different types of dielectric lens antennas and lens design methods. Representative lens antenna design examples are described in detail, with emphasis on homogeneous integrated lenses. A review of the different lens analysis methods is performed, followed by the discuss ion of relevant lens antenna implementation issues like feeding options, dielectric material characteristics, fabrication methods and a few dedicated measurement techniques. The chapter ends with a detailed presentation of some recent application examples involving dielectric lens antennas.

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“…Recently, an ingenious technological process has been developed to control the permittivity of foam materials [12], [13]. By changing the ratio between the core material of the foam and its gas (i.e.…”

Section: Manufacturing Of Gradient Index Lensesmentioning

confidence: 99%

“…by pressing more or less the foam) it is possible to control, up to a certain extent, the permittivity of the foam. More details on the pressing process and the relation between the foam density and its permittivity are given in [13]. This process is a cheap way to easily manufacture very lightweight gradient index lenses.…”

Section: Manufacturing Of Gradient Index Lensesmentioning

confidence: 99%

Flat foam-based Mikaelian lens antenna for millimeter wave applications

Bor

Fuchs

Lafond

et al. 2014

2014 11th European Radar Conference

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International audience—The design principles and radiation performances of Mikaelian lens antennas are investigated. An innovative technique to manufacture gradient index lenses based on the variation of the foam density is described and applied to Mikaelian lenses. This yields low cost and lightweight lenses. The radiation performances of a foam-based planar Mikaelian lens antenna are simulated and measured at 60 GHz. They validate the foam technique and show the potentialities of such lens antennas

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

Cited by 41 publications

References 10 publications

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

Dielectric Lens Antennas

Flat foam-based Mikaelian lens antenna for millimeter wave applications

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