Dielectric properties of single crystal fluorides at microwave frequencies and cryogenic temperatures

Hartnett, John G.; Fowler, Alison; Tobar, Michael E.; Křupka, J.

doi:10.1109/freq.2003.1275123

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…The materials we have used are Magnesium Fluoride, Calcium Fluoride (CaF 2 ) and Lithium Fluoride (LiF) and Barium Fluoride [1][2][3][4]. Some of the properties of the materials used namely MgF 2 , CaF 2 , LiF and BaF 2 are shown in Table 1 [1][2][3][4][5][6] and reference therein.…”

Section: Introductionmentioning

confidence: 98%

Understanding the Fundamental Material Constants in Microwave Measurement

Jacob

2009

Ferroelectrics

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Microwave characterisation of dielectric materials is vital to implement the material in communication devices and circuits. The microwave characterisation parameters are the dielectric constant, loss tangent, Q 0 × f 0 , temperature coefficient of frequency and temperature coefficient of permittivity. This paper examines the microwave characterisation data of four different dielectric materials. From several experiments on different dielectric materials, it has been concluded that the concept of using Q 0 × f 0 and temperature coefficient of frequency, as a material property will not reflect on material's fundamental behaviour. On the other hand, it has been interesting to note that the temperature coefficient of permittivity of a material is a constant irrespective of the measurement technique and hence it is a material parameter. The studies on temperature dependent permittivity will reveal the knack of a material to operate as a frequency stable circuit or device.

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Section: Introductionmentioning

confidence: 98%

Understanding the Fundamental Material Constants in Microwave Measurement

Jacob

2009

Ferroelectrics

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“…Table 2 shows the comparison of dielectric constant of commonly used Fluorides. LiF is characterised at cryogenic temperatures by three different groups [4][5][6]. One of the advantageous of LiF crystal over fluorides is its higher permittivity.…”

Section: Introductionmentioning

confidence: 99%

Low temperature microwave characterisation of lithium fluoride at different frequencies

Jacob

2005

Science and Technology of Advanced Materials

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Precise knowledge of dielectric properties of materials is required to implement the material in high frequency devices and circuits. At microwave frequencies complex permittivity (dielectric constant and loss tangent) are the two mandatory parameters prior to any design. We have identified Lithium Fluoride as a potential candidate, which can be used in conjunction with superconducting and non-superconducting parts of several microwave communication devices. Even though dielectric constant of LiF is known at room temperature there only limited data presented at cryogenic temperatures. We have used a dielectric post resonator for the microwave characterisation of the rod shaped LiF crystal. In this paper, we have reported the dielectric constant (perpendicular component of the real part of complex permittivity) and loss tangent of two LiF crystals as a function of temperature (15-290 K) at frequencies of 8 and 16.5 GHz. We have also studied and reported the temperature coefficient of frequency and permittivity. The concept of using temperature coefficient of frequency as a standard is proved to be wrong in this paper. Microwave properties of other Fluorides are also compared with the LiF crystal. q

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Low Temperature Complex Permittivity of MgF>inf<2>/inf<at Microwave Frequencies from TE>inf<01δ>/inf<Modes

Jacob

Mazierska

Křupka³

2005 Asia-Pacific Microwave Conference Proceedings

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Dielectric properties of single crystal fluorides at microwave frequencies and cryogenic temperatures

Cited by 4 publications

References 9 publications

Understanding the Fundamental Material Constants in Microwave Measurement

Understanding the Fundamental Material Constants in Microwave Measurement

Low temperature microwave characterisation of lithium fluoride at different frequencies

Low Temperature Complex Permittivity of MgF>inf<2>/inf<at Microwave Frequencies from TE>inf<01δ>/inf<Modes

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Dielectric properties of single crystal fluorides at microwave frequencies and cryogenic temperatures

Cited by 4 publications

References 9 publications

Understanding the Fundamental Material Constants in Microwave Measurement

Understanding the Fundamental Material Constants in Microwave Measurement

Low temperature microwave characterisation of lithium fluoride at different frequencies

Low Temperature Complex Permittivity of MgF&gt;inf&lt;2&gt;/inf&lt;at Microwave Frequencies from TE&gt;inf&lt;01&#948;&gt;/inf&lt;Modes

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Low Temperature Complex Permittivity of MgF>inf<2>/inf<at Microwave Frequencies from TE>inf<01δ>/inf<Modes