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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Souriou, David
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Topics
Publications (9/9 displayed)
- 2022Numerical study to evaluate characteristics of an embedded SHM sensor to prevent rebar corrosion in concrete using magnetic flux density
- 2022Numerical and experimental study to investigate the performance of a novel embedded SHM tool to evaluate chlorides front probability of reinforced concrete structures
- 2018Magnetic and dielectric properties in the UHF frequency band of half-dense Ni-Zn-Co ferrites ceramics with Fe-excess and Fe-deficiencycitations
- 2011Suitability of Ni-Zn Ferrites Ceramics with Controlled Porosity As Granular Substrates for Mobile Handset Miniaturized Antennas
- 2011Pressure Dependence of the Frequency Permeability Spectra of Soft Ferrite Composite Materials: A Method of Measuring the Natural Ferromagnetic Resonance Frequencycitations
- 2010Influential parameters on electromagnetic properties of nickel-zinc ferrites for antenna miniaturization
- 2007Conventional pressing and High Velocity compaction (HVC) of ceramic powders : influence of forming process on sintering
- 2006Comparison of conventional and High Velocity Compaction of alumina powderscitations
- 2006Comparison of Conventional and High Velocity Compaction of Alumina Powderscitations
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article
Suitability of Ni-Zn Ferrites Ceramics with Controlled Porosity As Granular Substrates for Mobile Handset Miniaturized Antennas
Abstract
Low-loss Ni-Zn porous ferrite ceramics have been obtained (porosity close to 40%) after appropriate heat treatment and shaping of nanosized powders. The key point in this process is a moderate reaction sintering that promotes desired value of porosity. Measured complex permeabilities and permittivities in the [10 7 Hz -10 10 Hz] frequency range are presented. The developed materials show almost constant refractive index value n close to 5 up to 900 MHz. The sum of the magnetic and dielectric losses shows moderate values up to a frequency value f, unusual for spinel ferrites: tanδ μ +tanδ ε <; 0.083 at f=600 MHz. Their efficiency for miniaturization and performances improvement of several new antennas for Digital Video Broadcasting Handheld (DVB-H) devices (frequency ranging: 470-862 MHz) are presented. High miniaturizations (about 40% to 60% when compared to not loaded antenna) are obtained. Low loss, wide bandwidth and good radiation efficiency are measured. Antennas performances are enhanced. A new antenna is also presented. Its dimensions are very small and it covers the entire DVB-H band. Suitability of Ni-Zn porous ferrites ceramics for antenna miniaturization for DVB-H applications is demonstrated.