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1.
High-temperature superconducting filter using self-embedding asymmetric stepped impedance resonator with wide stopband performance and miniaturized size 下载免费PDF全文
In this study, a novel self-embedding asymmetric stepped impedance resonator(SE-ASIR) topology is proposed. By embedding asymmetric stepped impedance resonators in themselves, circuit sizes of ASIRs can be reduced effectively,while the ability to control spurious modes of ASIRs remains. Therefore, SE-ASIRs are suitable for being used to design filters with wide stopbands and miniaturized sizes. Furthermore, the construction process of the SE-ASIR is described in detail, and an equivalent model of the SE-ASIR is proposed. For demonstration, a high-temperature superconducting bandpass filter centered at 1112 MHz is designed and fabricated. The measured result agrees well with the simulation result and shows that the out-of-band rejection is better than 60 dB up to 4088 MHz, which is about 3.7 times the center frequency.The filter circuit size is 31 mm ×13 mm or 0.28λ_g× 0.12λ_g, where λ_g is the guided wavelength at 1112 MHz. 相似文献
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提出了一种新型的基于双枝节加载的T型四模谐振器,并且利用该谐振器设计了一款双模双通带带通滤波器。首先利用奇偶模分析法以及场分布分析法对四模谐振器的频率特性进行分析,谐振器的每一个谐振模式均可以被独立调节。然后对馈线枝节的参数进行了详细的分析,得到馈线对滤波器外部耦合系数的影响,以调整滤波器通带的带通宽度。接着分析滤波器传输零点产生的原因,得到零点变化的规律,从而调整零点位置,提高滤波器的选择性。缺陷地结构(DGS)被蚀刻在滤波器的金属层底面,以引入非谐振节点,提供源与负载的耦合,可以产生额外的传输零点,进一步提高滤波器的选择性,而且不会增大滤波器的体积。对该滤波器进行加工和测试,仿真结果与测试结果基本吻合。 相似文献
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设计了一种新的具有良好选择性的小型化的双模双通带带通滤波器。该滤波器的谐振结构由两个短路枝节加载谐振器(SSLR)连接到同一个接地金属柱构成。首先通过奇偶模分析方法分析单个SSLR的谐振频率,得到谐振频率的变化规律;然后为了实现滤波器的小型化,将两个SSLR连接到同一个金属柱上并且折叠微带线,通过调节枝节长度分析滤波器通带的变化;设计中使用双枝节分别对谐振器馈电的结构,并且引入了源与负载耦合,可以在上阻带多提供一个传输零点,以提高阻带抑制;最后对滤波器的传输零点进行分析,提高滤波器的选择性。通过上述的分析,对该滤波器进行仿真、加工以及测试,得到最后实物的测试结果与软件的仿真结果较为一致。 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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近几十年来,超导单光子探测技术被越来越广泛的应用于量子保密通信与线性光量子计算等重要领域中.其中,基于超导共面波导谐振器的单光子技术以其结构简单,高探测效率及可分辨光子数目等特性吸引了人们越来越多的关注.随着科研工作者对样品制备工艺的不断改进,对选用超导薄膜材料的不断优化,以及对相关背景理论的深入研究,共面波导谐振器单光子探测技术在近几年中取得了巨大的突破.本文将从共面波导谐振器单光子探测器的工作原理,相关理论研究,样品参数设计等方面出发,结合本实验室近期测试得到的实验结果,对共面波导谐振器单光子探测技术的发展近况进行简要的综述. 相似文献
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Compact ultra-narrowband superconducting filter using N-spiral resonator with open-loop secondary coupling structure 下载免费PDF全文
《中国物理 B》2020,(6)
A novel N-spiral resonator with open-loop secondary coupling structure(OLSCS) is proposed to realize a compact ultra-narrowband high temperature superconducting(HTS) filter. The coupling strength and polarity between the resonators can be significantly reduced and changed by introducing OLSCS, thus the required weak coupling can be achieved in a very compact size. A six-pole superconducting filter at 1701 MHz with a fractional bandwidth of 0.19% is designed to validate this method. The filter is fabricated on Mg O substrate with a compact size of 15 mm × 10 mm. The measured insertion loss is 0.79 d B, and the return loss is better than 17.4 d B. The experimental results show a good agreement with the simulations. 相似文献
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In this paper, a single optical ring resonator connected to a Sagnac loop is used to demonstrate theoretically a novel narrow band optical filter response that is based on Sagnac phase-shift Δφ. The given filter structure permits the Sagnac rotation to control the filter response. It is shown that by changing the Sagnac rotation rate, we can tune the filter response for desired bandwidths. To increase the wavelength selectivity of the filter, the Sagnac phase-shift should be as small as possible that is limited by the loop length. For Δφ=0.1 rad, the obtained FWHM is 2.63 MHz for tuning loop length of 2 m. The simulation response agrees fairly with the recently reported experimental result. 相似文献
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This paper presents a novel microstrip feedline structure to introduce an extra and controllable transmission zero(TZ)with high rejection for a narrowband filter. This structure loads a reconfigurable capacitor at the end of the input feedline without changing the main structure of the filter. The capacitor is recognized by a 2-bit inter-digital capacitor array. The asymmetrical microstrip feedline structure is suitable for multiple-pole filter designs. A low-loss six-pole high-temperature superconducting bandpass filter with a reconfigurable TZ is designed and fabricated. The center frequency of the filter is 5.22 GHz with TZ at the lower stopband. The TZ can be tuned among four different states. The out-of-band rejection at the TZ frequency is higher than 90 d B, and the insertion loss is lower than 0.92 d B. The measured results are consistent with the simulations. 相似文献
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In this paper, a high tunable Electro-optical filter is designed and simulated with low electric power consumption. A silicon nanobeam resonator based on one-dimensional photonic crystal in the form of Fabry–Perot structure, silicon-on-insulator waveguide, is proposed with a PIN junction. In designing nanobeam resonator, “deterministic design method” is used to achieve the high quality factor and high-transmission rate. Tuning of the resonant wavelength in the output channel of the filter is achieved by manipulating the refractive index of the active area by using the free-carrier dispersion effect. The output wavelengths of designed device can be tuned for the telecom-friendly 1.55 µm range. The device shows a wavelength shift higher than 3 nm for a power consumption of only 0.9 mW. Finally, the simulation results show that the provided device can be considered as a narrowband and tunable Electro-optical filter that is suitable for DWDM communication system. 相似文献
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高温超导滤波器的封装是影响超导滤波器性能的重要环节之一。文中详细讨论了封装盒设计应该注意的细节,避免影响超导滤波器性能的因素出现。成功地应用超声点焊的方法解决了PIN接头和高温超导滤波器电极的连接,达到了较小的接触电阻和较好的机械强度。 相似文献
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A tunable comb filter using single-mode/multimode/polarization-maintaining-fiber-based Sagnac fiber loop 下载免费PDF全文
A novel tunable comb filter composed of a single-mode/multimode/polarization-maintaining-fiber-based Sagnac fiber loop is proposed and experimentally demonstrated. The filter tunability is achieved by rotating the polarization controller. The spectral shift is dependent on rotation direction and the position of the polarization controller. In addition, the adjustable range achieved by rotating the half-wave-plate polarization controller is twice higher than that of the quarter-wave-plate one. 相似文献
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提出一种基于光子晶体环形腔的四波长THz滤波器,该滤波器在光子晶体结构中引入两个环形腔,且环形腔内部各增加一个正方形介质柱,四周各引入一个散射介质柱。应用基于时域有限差分法(FDTD)的Rsoft软件进行仿真分析,结果表明通过对内部正方形介质柱的边长、散射介质柱半径以及耦合介质柱半径等结构参数的调节,可以滤出74.813,76.98,78.168和78.883 m四个太赫兹波长。该滤波器性能优良,透过率高、Q值高、信道隔离度大,对于THz技术应用具有重要意义。 相似文献
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采用嵌入Fabry-Perot谐振腔的方式,研究了Tl2Ba2CaCu2O8(Tl-2212)高温超导薄膜双晶约瑟夫森结的毫米波辐照特性.重点研究了双晶约瑟夫森结与Fabry-Perot谐振腔的耦合特性,发现放置在谐振腔中的结的位置、角度、结的图形以及Fabry-Perot谐振腔中两镜面间的距离等对耦合都有很大的影响.通过精细调节这些参数,可使双晶约瑟夫森结与外加毫米波达到最佳耦合.在最佳耦合情况下,能观察到9级明显的夏皮罗台阶.利用Fabry-Perot谐振腔技术,解决了约瑟夫森结与毫米波的耦合问题,为高温超导约瑟夫森结的毫米波及太赫兹波的辐射和检测研究奠定了基础. 相似文献
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A tunable infrared plasmonic polarization filter is proposed and investigated in this paper. The filter is based on the sandwich absorption structure which consists of three layers. The top layer is an array of asymmetrical cross resonator.The middle and bottom layers are dielectric spacer and metal film respectively. By absorbing specific wavelength of the incident light perfectly, the reflection spectrum of the structure shows filter performance. The calculated results show that the absorption wavelength is strongly dependent on the length of branch of the asymmetrical cross resonator which is parallel to the light polarization and independent of the length of the vertical one. Therefore, the asymmetrical cross resonator filter structure opens the way for freely tuning the filtering wavelength for a different light polarization. We can fix a resonant wavelength(absorption wavelength) corresponding to one polarization and change the resonant wavelength for the other polarization by adjusting the corresponding branch length of the asymmetrical cross resonator, or change the two resonant wavelengths of both two polarizations at the same time. 相似文献
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在光子晶体环形腔中增加两个散射介质柱,构成一个新型的环形腔滤波器,该滤波器能有效选择光波透过,光波的透射率可以达到90%以上,带宽较小.可通过这两种不同的调节方式使滤波器中波长的带宽和数值进行任意的改变:1)减小散射介质柱半径,从负载波导输出波长的带宽变大,主波导中波长的带宽减小;增大其半径时,它们的变化正好相反.2)改变耦合区域介质柱半径的大小,滤波器中波长的数值也会相应地变化,它与介质柱半径的变化呈正比,并且透射率也会发生明显的变化.这就为其在制备集成光子器件的应用中奠定了基础.
关键词:
环形腔
滤波器
散射介质柱
透射率 相似文献
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A band pass THz filter has been presented by the aid of coupling between the waveguides and ring resonator based on metallic photonic crystal slab. The rows of rods are missed and remaining rods in the rows play as a reflector then the position of central rods are rearranged as a ring, the radius of reflector rods and ring resonator is modified in order to optimize the resonance frequency and Q-factor. In addition, 3D-FDTD method is used for simulation results. One of the predominant features of the proposed structure for THz filter is its capability of obtaining a Q-factor of about 333 in the 1 THz resonance frequency with the normalized peak transmission of higher than 0.7, because of high Q-factor cavity based on ring resonator. 相似文献