Half-Massive Ceramics for Antenna Downsizing: Improvement of a Smart Magneto-Dielectric Material with Matching Permeability and Permittivity, and with Enhanced Low-Loss Frequency Range - Université de Rennes Accéder directement au contenu
Communication Dans Un Congrès Année : 2015

Half-Massive Ceramics for Antenna Downsizing: Improvement of a Smart Magneto-Dielectric Material with Matching Permeability and Permittivity, and with Enhanced Low-Loss Frequency Range

Résumé

— Complex permeability and permittivity of Ni 0.5 Zn 0.3 Co 0.2 Fe 1.98 O 4-x half-ceramic ferrites (porosity ~50%), obtained from various annealing temperature T A (500°C, 800°C, 900°C), are measured and compared. Their characteristic impedance Z, magnetic and dielectric loss tangents are presented. Bandwidth BW and radiation efficiency η values of patch antennas are obtained through numerical simulations and compact formulations. The value of the annealing temperature used for the substrates determines those of BW and η. BW and η are themselves used as criteria to decide which one among the various substrates is proper to be used at given frequency. It is concluded that whereas the sample annealed at 500°C is far to meet the required properties in reason of detrimental magnetic losses, the half massive ceramics got after annealing at T A =800°C and 900°C show appropriate performances for further applications. The electromagnetic properties of half ceramics materials sound to be very competitive at frequencies up to 0.8GHz.
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Dates et versions

hal-01121689 , version 1 (02-03-2015)

Identifiants

  • HAL Id : hal-01121689 , version 1

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Emmanuel Le Guen, Anne-Claude Tarot, Jean-Luc Mattei. Half-Massive Ceramics for Antenna Downsizing: Improvement of a Smart Magneto-Dielectric Material with Matching Permeability and Permittivity, and with Enhanced Low-Loss Frequency Range. EUCAP, Apr 2015, Lisbonne, Portugal. ⟨hal-01121689⟩
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