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制备了基于超导铝膜的四分之一波长反射型共面波导谐振器,并利用矢量网络分析仪测量了该谐振器在低温超导状态下的传输特性。实验结果表明:对于拥有较大耦合电容的超导共面波导谐振器,在超导状态下随着环境温度的升高,超导薄膜的表面阻抗会增大,进而谐振器的中心谐振频率降低,谐振峰变宽。温度越高,谐振频率随温度升高而向低频偏移的速率越快。另一方面,随着环境温度升高,谐振器的外部耦合品质因数和负载品质因数也都会降低。温度越高,谐振器品质因数随温度升高而降低的速率越快。用二能级理论解释了实验现象,品质因数理论计算值与实验测量结果相接近。 相似文献
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超导量子电路已成为实现量子计算机的主流技术路线之一,其中四分之一波长超导谐振腔主要用于读取量子比特的状态信息,是实现超导量子电路的关键器件.本文设计了四分之一波长超导谐振腔,利用两种电磁仿真算法(有限元法以及矩量法),对超导谐振腔的传输特性进行建模仿真验证.制备出了设计的超导谐振腔样品,在20±5 mK的低温环境下对其传输特性进行测量.通过仿真结果与设计值和实测值进行对比研究,发现基于矩量法的sonnet软件在仿真准确性、仿真速率以及资源消耗等方面都优于基于有限元法的HFSS软件.同时研究了谐振腔之间的串扰对仿真精度的影响,当谐振腔数目不多时,其相互之间串扰的影响几乎可以忽略. 相似文献
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太赫兹波段占有宇宙微波背景(CMB)辐射以后宇宙空间近一半的光子能量,该波段在天文学研究中具有不可替代的作用,因此太赫兹天文学的研究,具有极其重要的科学意义。本文系统介绍了基于超高灵敏度太赫兹超导探测技术的太赫兹相干探测器发展状况,包括超导隧道结混频器(SIS)和超导热电子混频器(HEB),以及以超导动态电感探测器(MKIDs)和超导相变边缘探测器(TES)为代表的非相干探测器的研究。在此基础上,展望了该领域未来发展趋势,对我国太赫兹天文探测技术的发展具有一定的参考意义。 相似文献
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We fabricated TiN coplanar waveguides using standard lithography techniques followed by ICP etch. In order to achieve high quality factor, we investigated the film growth by choosing different deposition conditions for various substrates. Quality factors of waveguide resonators were measured at 20 mK in both high and low microwave power limits. An inner quality factor of several million was achieved at high power limit for a predominantly(200)-oriented TiN film which was grown on HF cleaned silicon wafer. A quality factor of larger than one million was achieved at high power limit for TiN film grown on sapphire. 相似文献
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A study on the microwave responses of YBCO and TBCCO thin films by coplanar resonator technique
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YBa2Cu3O7(YBCO) thin films have been prepared by
thermal coevaporation on LaAlO3(LAO) substrates, and
Tl2Ba2CaCu2O8(TBCCO) thin films are synthesized
by magnetron sputtering method on LAO substrates. The transition
temperature Tc is 90\,K for YBCO/LAO and 104\,K for
TBCCO/LAO. Microwave responses of the films are studied
systematically by coplanar resonator technique. Energy gaps of the
films obtained are {\it\Delta}0=1.04kBTc for YBCO
films and ${\it\Delta}_0=0.84kBTc for TBCCO films by
analysing the temperature dependence of resonant frequencies of
coplanar resonator. Penetration depth at 0\,K \lambda 0=198nm
for YBCO films and \lambda0 =200nm for TBCCO films could also
be obtained by using the weak coupling theory and two fluid theory.
Results of penetration depth and energy gap confirm the weak coupling
properties of the films. In addition, microwave surface resistances
Rs of YBCO/LAO and TBCCO/LAO are also investigated by
analysing the quality factor and insert loss of the coplanar
resonator. Surface resistance of TBCCO/LAO is less than that of
YBCO/LAO, so that TBCCO/LAO films may have more potential
applications. 相似文献
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Superconducting tunable filter with constant bandwidth using coplanar waveguide resonators
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In this paper we propose a two-pole varactor-tuned superconducting filter using coplanar waveguide(CPW) spiralin-spiral-out(SISO) resonators. Novel internal and external coupling structures are introduced to meet the requirements for a tunable filter with a constant absolute bandwidth. The fabricated device has a frequency tuning range of 14.4%at frequencies ranging from 274.1 MHz to 317.7 MHz, a 3-d B bandwidth of 5.14 ± 0.06 MHz, and an insertion loss of0.08 d B–0.70 d B. The simulated and measured results are in excellent agreement with each other. 相似文献
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An analytical model for coplanar waveguide on silicon-on-insulator substrate with conformal mapping technique
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In this paper, the authors present an analytical model for coplanar waveguide on silicon-on-insulator substrate. The four-element topological network and the conformal mapping technique are used to analyse the capacitance and the conductance of the sandwich substrate. The validity of the model is verified by the full-wave method and the experimental data. It is found that the inductance, the resistance, the capacitance and the conductance from the analytical model show they are in good agreement with the corresponding values extracted from experimental S-parameter until 10 GHz. 相似文献
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Mao Hai-yan Wang Fu-ren Meng Shu-chao Mao Bo Li Zhuang-zhi Nie Rui-juan Liu Xin-yuan Dai Yuan-dong 《Frontiers of Physics in China》2006,1(3):301-304
A new type of HTc superconducting film combshape resonator for radio frequency superconducting quantum interference devices
(RF SQUID) has been designed. This new type of superconducting film comb-shape resonator is formed by a foursquare microstrip
line without a flux concentrator. The range of the center frequency of this type of resonator varies from 800 MHz to 1 300
MHz by changing the length of the teeth. In this paper, we report on simulating the relationship of the value of the center
frequency and the length of the teeth, and testing the noise of HTc RF SQUID coupling this comb-shape resonator.
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Translated from Chinese Journal of Low Temperature Physics, 2005, 27(3) (in Chinese) 相似文献
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微型光波导陀螺中无源环形谐振器研究 总被引:3,自引:1,他引:3
光波导无源环形谐振器是微型光波导陀螺的核心敏感部件,其性能直接影响陀螺的极限分辨率和各误差项,是此种陀螺设计和制造中的关键。本文通过理论分析,对无源环形谐振器进行了深入的研究,提出了可行的光学系统设计,并结合现有先进的光学工艺,提出了加工与制造的方案。 相似文献
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Compact superconducting single-and dual-band filter design using multimode stepped-impedance resonator
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This study presents two multimode stepped-impedance structures to design single-and dual-band filters. Transmission zeroes are introduced for the single-band filter by using dual-mode stepped-impedance resonators. The single-band filter with high selectivity is centered at 6.02 GHz and has a fractional bandwidth(FBW) of 25.6%. Four stubs(two low frequency and two high frequency ones) are connected to the rectangular patch in the center to construct a quadruplemode resonator. The independent conditions of the center frequencies of the high and low bands of the resonator are analyzed. A dual-band filter, which operates at 1.53 GHz and 2.44 GHz with FWBs of 12.1% and 14.1%, respectively is designed. The single-and dual-band filters are both fabricated with double-sided YBCO films and they can be used in mobile and satellite communications. 相似文献
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采用AgNO3和KNO3混和熔盐作为离子交换源,在K9玻璃上制备了跑道形波导谐振腔滤波器。利用ASE宽带光源和光谱仪对器件特性进行了测试,得到的该滤波器自由光谱范围为0.176nm。对比对Cr=4dB和3dB带宽δλ=0.13nm来说,耦合系数和传输损耗分别为к=0.9和α=3.2dB/cm。测试了环形腔的热光调相特性,在16℃的变化范围内实现了2π的相移。通过分析,波导材料的热光系数约为1.49×10-5/℃。该滤波器不仅可用于滤波、传感等领域,而且也可与其它波导结构相结合实现新的功能。 相似文献
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A few traditional pulse-forming circuits are implemented in a commercial 0.13 μm digital complementary-metal-oxide-semiconductor(CMOS)technology.These circuits,based on a coplanar waveguide,are analyzed and compared through CadenceTM Spectre simulations.The results show that these traditional pulse-forming-line(PFL)based circuits can be implemented in standard CMOS technology for short pulse generations.Further work is needed to explore the potential of the circuit techniques and to minimize parasitic effects. 相似文献
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提出了一种以金刚石新型材料为芯层的单微环谐振器模型.谐振器的纵切面采用五层脊形波导结构,中间一层设定为金刚石,上下两侧分别是SiO_2和As_2S_3,即As_2S_3-SiO_2-金刚石-SiO_2-As_2S_3.设置操作波长为1550 nm,依据耦合膜理论和微环谐振理论,利用Comsol软件仿真模拟了单直波导纵切面、直波导和环形波导耦合区的纵切面以及微环在谐振波长为1543 nm时的场强分布,及直波导和环形波导耦合区间距改变时微环的场强分布和传输特性.在此基础上,依据传输矩阵法讨论了微环的品质因数、耦合系数变化对输出光谱的影响,并对微环损耗进行了讨论.结果表明:以金刚石为芯层的微环谐振器具有良好的光学特性,本结构在谐振波长为1543 nm时谐振峰值达到了-12 dB以上,品质因数达到了1.54×10~5,在耦合系数为0.01时,自由光谱范围约为40 nm. 相似文献