Miniature HTS spiral cavity resonator for mobile telephone bands

Hejazi, Z.M.; Excell, Peter S.

doi:10.1080/002072199133742

Cited by 8 publications

(8 citation statements)

References 4 publications

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“…The resonator components were placed in a metallic shield case, designed according to experimental investigations [9], [10] for optimization of shield cases enclosing spiral resonators.…”

Section: B Measurement Results and Comparisonsmentioning

confidence: 99%

Compact superconducting dual-log spiral resonator with high Q-factor and low power dependence

Hejazi¹,

Excell

2002

IEEE Trans. Appl. Supercond.

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A new dual-log spiral geometry is proposed for microstrip resonators, offering substantial advantages in performance and size reduction at subgigahertz frequencies when realized in superconducting materials. The spiral is logarithmic in line spacing and width such that the width of the spiral line increases smoothly with the increase of the current density, reaching its maximum where the current density is maximum (in its center for 2 resonators). Preliminary results of such a logarithmic ten-turn (2 5 turns) spiral, realized with double-sided YBCO thin film, showed a -factor seven times higher than that of a single ten-turn uniform spiral made of YBCO thin film and 64 times higher than a copper counterpart. The insertion loss of the YBCO dual log-spiral has a high degree of independence of the input power in comparison with a uniform Archimedian spiral, increasing by only 2.5% for a 30-dBm increase of the input power, compared with nearly 31% for the uniform spiral. A simple approximate method, developed for prediction of the resonant frequency of the new resonators, shows a good agreement with the test results.

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“…The resonator components were placed in a metallic shield case, designed according to experimental investigations [9], [10] for optimization of shield cases enclosing spiral resonators.…”

Section: B Measurement Results and Comparisonsmentioning

confidence: 99%

Compact superconducting dual-log spiral resonator with high Q-factor and low power dependence

Hejazi¹,

Excell

2002

IEEE Trans. Appl. Supercond.

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“…Although planar spirals are often used in inductors, transformers, couplers, and antennas, they have obvious advantages as electrically small resonators [7]- [10]. However, it seems difficult to develop filters using the spiral cavity resonator structure presented in [8]. Though a conceptional diagram of compact filter using spiral resonators as resonator elements was proposed in [7], fabrication of such filter is of technical challenges.…”

Section: Dual-spiral Resonatorsmentioning

confidence: 99%

High-temperature superconducting bandpass spiral filter

Ong

Chen

et al. 1999

IEEE Microw. Guid. Wave Lett.

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We report a new type of microstrip bandpass spiral filter structure, which exhibits much smaller size than other existing miniaturized bandpass filter structures, and is particularly useful in developing hightemperature superconducting (HTS) compact filters for cellular communication systems. A prototype three-stage HTS bandpass spiral filter with center frequency of 633 MHz was designed and fabricated on a 20 mm 2 8 mm 2 0.5 mm LaAlO 3 substrate. The measurement results of the spiral filter have good agreements with its electromagnetic full-wave simulation results.

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“…Introducing lump element capacitance can further reduce size. Ring resonators, Meander-line resonators [7,8] and spiral resonators [9][10][11][12] are also self-coupled resonators with a more complicated structure and internal couplings. Figure 2 shows the layout of a closed loop self-coupled resonator.…”

Section: Introductionmentioning

confidence: 99%

Resonator structure with high etching error tolerance for application in HTS filters

Tan

Ong

2002

Supercond. Sci. Technol.

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Dimensional errors introduced during the etching process in the fabrication of a planar microwave circuit can significantly affect the performance of the circuit. Full-wave electromagnetic simulations are used to study the influence of etching errors on the performance of high temperature superconductor (HTS) resonators. Resonators with self-coupling are found to have a high tolerance for etching error. This kind of resonator can be useful for applications in planar HTS resonators and filters.

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Miniature HTS spiral cavity resonator for mobile telephone bands

Cited by 8 publications

References 4 publications

Compact superconducting dual-log spiral resonator with high Q-factor and low power dependence

Compact superconducting dual-log spiral resonator with high Q-factor and low power dependence

High-temperature superconducting bandpass spiral filter

Resonator structure with high etching error tolerance for application in HTS filters

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