Simplified method for measurements and calculations of coupling coefficients and Q/sub 0/ factor of high-temperature superconducting dielectric resonators

Jacob, Mohan V.; Mazierska, J.; Leong, Kenneth; Křupka, J.

doi:10.1109/22.971627

Cited by 39 publications

(26 citation statements)

References 9 publications

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“…The real part (ε r ) of relative permittivity was computed from the measured resonance frequency (f) of the resonator containing the sample under test. The loaded Q factor (QL) of the resonator was measured directly from the VNA and the unloaded Q factor (Qu) was calculated using a computer program which took into account the cavity losses and coupling conditions [21,22]. The quality factor of the resonator ceramics is usually represented as Qu.f.…”

Section: Methodsmentioning

confidence: 99%

Effect of lanthanide ion substitution on RF and microwave dielectric properties of BiNbO4 ceramics

Butee

Kulkarni

Prakash

et al. 2010

Journal of Alloys and Compounds

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Section: Methodsmentioning

confidence: 99%

Effect of lanthanide ion substitution on RF and microwave dielectric properties of BiNbO4 ceramics

Butee

Kulkarni

Prakash

et al. 2010

Journal of Alloys and Compounds

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“…For higher temperatures only S 21 was measured and the unloaded Q-factor was calculated using a simplified TMQF method [11]. The simplified TMQF method calculates the coupling coefficient of both ports at each measurement temperature and hence the accurate unloaded Q-factor.…”

Section: Measurements Of Microwave Properties Of Yvomentioning

confidence: 99%

Dielectric Properties of Yttrium Vanadate Crystals from 15 K to 295 K

Jacob

Mazierska

Křupka³

2005

J Electroceram

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Yttrium Vanadate (YVO 4 ) is a birefringent crystal, which has similar dielectric constant as that of Sapphire. In this paper we have reported the measurement of the real part of permittivity and loss tangent of YVO 4 crystal in the temperature range 15-295 K at a frequency of 16.3 GHz. We have used the dielectric post resonator technique for the microwave characterisation of the YVO 4 dielectric rod. The multifrequency Transmission Mode QFactor (TMQF) technique has been used for data processing and hence precise values of permittivity and loss tangent are achieved. Easily machineable YVO 4 is characterized by low losses at microwave frequencies. At temperature of 15 K and frequency of 16.3 GHz the permittivity was 9.23 and loss tangent was 2 ×10 −5 . YVO 4 is identified as a potential candidate to replace expensive Sapphire in many microwave applications.

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“…The S 21 parameter is measured as a function of temperature from 20 to 290 K. The coupling coefficient for each measurement temperature is calculated using a simplified TMQF [18] and hence the unloaded Q-factor. The perpendicular component of the real part of relative permittivity and loss tangent (tan d) of LiF was computed from the measured resonant frequency and unloaded Q-factor respectively using numerical methods.…”

Section: Experimental Techniquesmentioning

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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Simplified method for measurements and calculations of coupling coefficients and Q/sub 0/ factor of high-temperature superconducting dielectric resonators

Cited by 39 publications

References 9 publications

Effect of lanthanide ion substitution on RF and microwave dielectric properties of BiNbO4 ceramics

Effect of lanthanide ion substitution on RF and microwave dielectric properties of BiNbO4 ceramics

Dielectric Properties of Yttrium Vanadate Crystals from 15 K to 295 K

Low temperature microwave characterisation of lithium fluoride at different frequencies

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