Properties and applications of HTS-shielded dielectric resonators: a state-of-the-art report

Klein, N.; Scholen, A.; Tellmann, N.; Zuccaro, C.; Urban, K.

doi:10.1109/22.508242

Cited by 40 publications

(7 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The substrate materials under consideration were Czochralski grown LaA103 crystals produced at Lucent Technologies, Bell Labs (CzL) and at the Beijing Institute of Physics, Chinese Academy of Sciences (CzB) supplied by CrysTec GmbH, Germany, Verneuil grown LaA103 material supplied by CrysTec GmbH (VeC) and sapphire substrates supplied by CrysTec GmbH. On the most commonly used LaA103 substrates (CzL, lmm thick -triangles) the unloaded Q-factor is at temperatures higher than 40 K limited by dielectric losses, which is in agreement with measurements of HTS shielded dielectric resonators [3]. The Q-factor of resonators on sapphire substrates (lmm thick -diamonds) is not determined by the loss tangent at any temperatures, resultinl; in considerably higher values at the technically attractive temperature range between 60 K and 75 K, but for the same resonant frequency their volume is 2.5 times (ratio of the dielectric constants) larger compared to resonators on LaA103…”

Section: Characterization Of Single Disk Resonatorssupporting

confidence: 62%

“…At present, two different approaches are suited to meet these requirements of stored energy and unloaded quality factor, namely the use of dielectric resonators with HTS endplates [2], [3] and the newly developed concept of the "edge-current free" disk and ring resonators operating at TMolo-mode [4], [5]. This paper is devoted to the latter approach which offers, in comparison to the dielectric resonator concept, a higher degree of miniaturization at the expense of higher sensitivity to HTS film degradation.…”

Section: Required Performance and Principle Approachmentioning

confidence: 99%

See 1 more Smart Citation

HTS power filters for output multiplexers in satellite communications

Baumfalk

Chaloupka

Kolesov

et al. 1999

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

The paper reports on advances in the development of high temperature superconducting 40 MHz bandwidth fourpole bandpass filters with elliptic frequency response for 3.4 -4.2 GHz (extended C-band) output multiplexers of communication satellites. By employing the concept of "edgecurrent-free" disk and ring resonators the filters possess a small size but can handle 60 W transmitted power with sufficiently low insertion loss and intermodulation. Measurements of the unloaded Q-factor and power handling as function of the temperature, performed at single disk resonators made from YBa2Cu307.p on LaA103 and sapphire substrates indicate the conditions under which the required Q-factor of about 1.5.105 and sufficiently low nonlinear response up to an oscillating power of 15 kW can be obtained. Approaches for shifting the resonant frequencies of unwanted modes relative to the resonant frequency of the employed TMolo-mode are outlined and shown to be necessary for the envisaged multiplexer applications.

show abstract

Section: Characterization Of Single Disk Resonatorssupporting

confidence: 62%

Section: Required Performance and Principle Approachmentioning

confidence: 99%

HTS power filters for output multiplexers in satellite communications

Baumfalk

Chaloupka

Kolesov

et al. 1999

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

show abstract

“…Recently, several single-crystal dielectric materials have been investigated at cryogenic temperatures [8]- [15]. In this paper, we present predicted properties ( factors, dimensions) of high-DR's that can be made of such materials.…”

Section: Introductionmentioning

confidence: 99%

Single-crystal dielectric resonators for low-temperature electronics applications

Knupka

Mazierska

2000

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

Computed properties of high-factor sapphire, YAG, SrLaAlO 4 , LaAlO 3 , rutile, and quartz dielectric resonators (DR's) operating on whispering-gallery TE 011 and TE 01 modes are presented in this paper. Resonators with a superconducting metal or partly superconducting partly metal shield are considered. For whispering-gallery-mode resonators, dielectric losses determine upper limit for their factors, while for TE 011 -mode resonators, their factors are usually limited by conductor losses. Single-crystal TE 01 -mode resonators would have factors determined by both dielectric and conductor losses, and dominant loss mechanism depends on crystal losses and shield geometry. Geometric factors that allow evaluation of conductor losses of TE 011 -and TE 01 -mode resonators are given for different DR structures.

show abstract

“…Rutile is a uniaxial crystal with a large negative permittivity-temperature dependence and a relatively low microwave dissipation [3][4][5][6]. The negative permittivity dependence offers the potential for compensation of the more typical positive permittivity-temperature dependence of sapphire.…”

Section: Introductionmentioning

confidence: 99%

“…To predict the behaviour of such a hybrid resonator it is important to have accurately measured cryogenic microwave properties of rutile over the frequency and temperature range of interest. Previous measurements of the loss tangent of rutile at low temperatures appear to have been limited either by residual losses in the surrounding cavity or by impurities in the rutile material [4,5]. The previous measurements of permittivity were obtained using low-order modes which made it difficult to distinguish accurately between the two components of the dielectric tensor.…”

Section: Introductionmentioning

confidence: 99%

Microwave properties of a rutile resonator between 2 and 10 K

Luiten

Tobar

Křupka³

et al. 1998

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

We report new microwave measurements of the anisotropic loss tangent and permittivity of rutile using well confined `whispering gallery' type modes of a shielded dielectric resonator. We report the first measurement of the two independent components of the loss tangent tensor, as well as the lowest measurement yet of the total loss tangent of parallel to the crystal c-axis and perpendicular to the c-axis, both measured at 3 K. We show that the mode frequency dependence possesses two stationary points in the temperature range 2-10 K and explain this dependence in terms of the competing effects of incidental paramagnetic impurities in the rutile, the variation of the rutile's permittivity with temperature and the thermal expansion of the material. We give the first measurements of the anisotropic permittivity of rutile at low temperatures.

show abstract

Properties and applications of HTS-shielded dielectric resonators: a state-of-the-art report

Cited by 40 publications

References 17 publications

HTS power filters for output multiplexers in satellite communications

HTS power filters for output multiplexers in satellite communications

Single-crystal dielectric resonators for low-temperature electronics applications

Microwave properties of a rutile resonator between 2 and 10 K

Contact Info

Product

Resources

About