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| Naji, M. |
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| Mohamed, Tarek |
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| Azevedo, Nuno Monteiro |
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| Rignanese, Gian-Marco |
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Jacob, M. V.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2008Microwave Characterisation of MgTe2O5 using quasi TE0np Mode Dielectric Resonator Technique
- 2008Bi-2(Zn2/3-x/3Nb4/3-2x/3Tix)O-7 Ceramics - A High Permittivity Microwave Dielectrics for Electronics Application
- 2007Non-destructive complex permittivity measurement of low permittivity thin film materialscitations
- 2006Cryogenic complex anisotropic permittivity of magnesium fluoridecitations
- 2006Dielectric characterisation of Barium Fluoride at cryogenic temperatures using TE011 and quasi TE0mn mode dielectric resonatorscitations
- 2005Low temperature complex permittivity of MgF/sub 2/ at microwave frequencies from TE/sub 01/spl delta// modescitations
- 2004Recent advances in measurements of permittivity and dielectric losses at microwave frequenciescitations
- 2004Microwave characterization of (La,Sr)(AlTa)O3 using TE011 mode dielectric resonator
- 2003Lithium tantalate - a high permittivity dielectric material for microwave communication systemscitations
- 2003Microwave characterisation of CaF2 at cryogenic temperatures using a dielectric resonator techniquecitations
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article
Microwave characterisation of CaF2 at cryogenic temperatures using a dielectric resonator technique
Abstract
<p>Properties of calcium fluoride (CaF<sub>2</sub>) have been well researched at UV, visible and IR range of frequencies but not at microwave frequencies. In this work we report the loss tangent and the real part of relative permittivity ε <sub>r</sub> of CaF<sub>2</sub> measured in the temperature range 15-81 K and at frequency 29.25 GHz. The tan δ and ε <sub>r</sub> were determined by measurements of the resonant frequency and the Q <sub>0</sub>-factor of a TE<sub>011</sub> mode cylindrical copper cavity with superconducting plates containing the sample under test. The measured ε <sub>r</sub> of CaF<sub>2</sub> was found to change from 6.484 to 6.505, and the tan δ from 3.1×10<sup>-6</sup> to 22.7×10<sup>-6</sup> when temperature was varied from 15 to 81 K. Due to the low losses CaF<sub>2</sub> can be useful in construction of high Q-factor microwave circuits and devices operating at cryogenic temperatures. © 2003 Elsevier Ltd. All rights reserved.</p>