High permeability and high permittivity heterostructures for the miniaturization of Radiofrequency components

Abstract : This paper discusses on the miniaturization of radiofrequency (RF) front-end components such as half-wavelength resonators based on new magneto-dielectric heterostructures combining high permeability (µ = 150-250) and high permittivity (ε = 18-150). Size reduction is evaluated by means of 2-cm-long coplanar waveguides realized with silicon technology and having a resonance frequency of about 3 GHz. The experimental results show a physical length reduction of 11.2% due to the dielectric contribution (ε = 18) and 14.8% by cumulating dielectric and magnetic effects (ε = 18 and µ = 150). These results are significant with respect to the moderate thickness of the preliminary material used here (only 150 nm). In a second part, a predictive model is proposed with µ and ε as variables. When adjusting the material properties in a realistic way (µ = 250 and ε = 150), the model predicts size reduction of ~50% for the same thickness. Larger values can be expected with increasing the film thickness.
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Submitted on : Thursday, January 5, 2012 - 4:33:52 PM
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Evangéline Bènevent, Kevin Garello, Dominique Cros, Bernard Viala. High permeability and high permittivity heterostructures for the miniaturization of Radiofrequency components. International Journal of Microwave and Wireless Technologies, Cambridge University Press/European Microwave Association 2010, 1 (6), pp. 455.460. ⟨10.1017/S1759078709990559⟩. ⟨hal-00657012⟩

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