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High-temperature superconducting microwave resonator with adjustable frequency

A high-temperature superconducting and resonator technology, applied in the field of electronics, can solve the problems of quantum interference equipment, low control energy, etc., and achieve the effects of high Q value, low radio frequency loss, and low control energy

Inactive Publication Date: 2006-10-11
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The quantum interference device method has the advantages of low control energy, low radio frequency loss, and fast control, but it needs to meet harsh conditions to achieve a single-value correspondence between the magnetic flux Φ and the current I, which will bring great benefits to the manufacture of quantum interference devices without hysteresis. difficulty

Method used

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  • High-temperature superconducting microwave resonator with adjustable frequency
  • High-temperature superconducting microwave resonator with adjustable frequency
  • High-temperature superconducting microwave resonator with adjustable frequency

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Embodiment

[0043] Parameters of the ring resonator 1: the outer diameter is R o =3.5mm, the inner diameter is R t = 3mm, the thickness of the conductor t = 0.35μm, the resonant frequency is f 1 =3.75Ghz, the characteristic impedance is Z o = 32.66Ω. The substrate material is LaAlO 3 (LAO) single crystal with relative permittivity ε r =23.6, substrate thickness H=0.5mm. when R = R i + R o 2 > H > > λ , where λ is the London penetration depth and the effective permittivity at 77K is calculated as ϵ eff = ϵ r + 1 2 + ϵ r ...

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Abstract

The invention relates to a frequency-tunable high-temperature superconducting microwave resonator, which is designed by using the characteristic that the equivalent nonlinear inductance of the Josephson junction changes with the current. The low-inductance adjustment open loops at both ends of any diameter of the device are directly coupled. There is a Josephson junction on each of the two adjustment open loops. The two adjustment open loops are respectively connected to a current source to form two adjustment circuits. By changing the current of the open loop, the equivalent inductance of the Josephson junction can be changed, and then the equivalent inductance of the ring resonator can be changed through the coupling between the open loop and the resonator, and finally the purpose of adjusting the resonance frequency can be achieved. The invention has the advantages of simple structure, easy realization, high Q value, low required control energy, rapidity, stability, low radio frequency loss and the like.

Description

technical field [0001] The invention relates to a frequency-adjustable high-temperature superconducting microwave resonator, which is a microwave passive device that uses the Josephson junction equivalent nonlinear inductance to realize frequency adjustment as the applied current changes, and belongs to the field of electronic technology. Background technique [0002] Tunable microwave passive devices (such as resonators) have important application value in the field of microwave technology because: (1) The flexibility of commercial and military radio frequency applications requires microwave passive devices to have high speed, high Q value, wide range of Tonality; (2) The adjustable feature can make up for design errors; (3) It can solve the problem of device frequency drift caused by changes in structural parameters due to changes in temperature. [0003] One of the first applications of thin-film high-temperature superconductors is passive devices, in part because of thei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P7/00
Inventor 黄慧芬毛军发
Owner SHANGHAI JIAOTONG UNIV
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