The Experts below are selected from a list of 17688 Experts worldwide ranked by ideXlab platform
Mianheng Jiang - One of the best experts on this subject based on the ideXlab platform.
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superconducting nanowire single photon detector with on chip Bandpass Filter
Optics Express, 2014Co-Authors: Xiaoyan Yang, Weijun Zhang, Lixing You, Lu Zhang, Xiaoyu Liu, Zhen Wang, Wei Peng, Xiaoming Xie, Mianheng JiangAbstract:Dark count rate is one of the key parameters limiting the performance of the superconducting nanowire single photon detector (SNSPD). We have designed a multi-layer film Bandpass Filter that can be integrated onto the SNSPD to suppress the dark counts contributed by the stray light and blackbody radiation of the fiber. The Bandpass Filter is composed of 16 SiO2/Si bilayers deposited onto the backside of a thermally oxidized Si substrate. The substrate shows an excellent Bandpass Filter effect and provides a high transmittance of 88% at the central wavelength of the pass band, which is the same as that of the bare substrate. The SNSPDs fabricated on the substrate integrated with the Bandpass Filter show conspicuous wavelength-sensitive detection efficiency. The background dark count rate is reduced by two orders of magnitude to sub-Hz compared with the conventional SNSPD (a few tens of Hz). The detector exhibits a system detection efficiency of 56% at DCR of 1 Hz, with the measured minimal noise equivalent power reaching 2.0 × 10−19 W/Hz1/2.
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superconducting nanowire single photon detector with on chip Bandpass Filter
arXiv: Superconductivity, 2014Co-Authors: Xiaoyan Yang, Weijun Zhang, Lixing You, Lu Zhang, Xiaoyu Liu, Zhen Wang, Wei Peng, Xiaoming Xie, Mianheng JiangAbstract:Dark count rate is one of the key parameters limiting the performance of the superconducting nanowire single photon detector (SNSPD). We have designed a multi-layer film Bandpass Filter that can be integrated onto the SNSPD to suppress the dark counts contributed by the stray light and blackbody radiation of the fiber. The Bandpass Filter is composed of 16 SiO2/Si bilayers deposited onto the backside of a thermally oxidized Si substrate. The substrate shows an excellent Bandpass Filter effect and provides a high transmittance of 88% at the central wavelength of the pass band, which is the same as that of the bare substrate. The SNSPDs fabricated on the substrate integrated with the Bandpass Filter show conspicuous wavelength-sensitive detection efficiency. The background dark count rate is reduced by two orders of magnitude to sub-Hz compared with the conventional SNSPD (a few tens of Hz). The detector exhibits a system detection efficiency of 56% at DCR of 1 Hz, with the measured minimal noise equivalent power reaching 2e-19 w/Hz1/2.
Xiaoyan Yang - One of the best experts on this subject based on the ideXlab platform.
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superconducting nanowire single photon detector with on chip Bandpass Filter
Optics Express, 2014Co-Authors: Xiaoyan Yang, Weijun Zhang, Lixing You, Lu Zhang, Xiaoyu Liu, Zhen Wang, Wei Peng, Xiaoming Xie, Mianheng JiangAbstract:Dark count rate is one of the key parameters limiting the performance of the superconducting nanowire single photon detector (SNSPD). We have designed a multi-layer film Bandpass Filter that can be integrated onto the SNSPD to suppress the dark counts contributed by the stray light and blackbody radiation of the fiber. The Bandpass Filter is composed of 16 SiO2/Si bilayers deposited onto the backside of a thermally oxidized Si substrate. The substrate shows an excellent Bandpass Filter effect and provides a high transmittance of 88% at the central wavelength of the pass band, which is the same as that of the bare substrate. The SNSPDs fabricated on the substrate integrated with the Bandpass Filter show conspicuous wavelength-sensitive detection efficiency. The background dark count rate is reduced by two orders of magnitude to sub-Hz compared with the conventional SNSPD (a few tens of Hz). The detector exhibits a system detection efficiency of 56% at DCR of 1 Hz, with the measured minimal noise equivalent power reaching 2.0 × 10−19 W/Hz1/2.
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superconducting nanowire single photon detector with on chip Bandpass Filter
arXiv: Superconductivity, 2014Co-Authors: Xiaoyan Yang, Weijun Zhang, Lixing You, Lu Zhang, Xiaoyu Liu, Zhen Wang, Wei Peng, Xiaoming Xie, Mianheng JiangAbstract:Dark count rate is one of the key parameters limiting the performance of the superconducting nanowire single photon detector (SNSPD). We have designed a multi-layer film Bandpass Filter that can be integrated onto the SNSPD to suppress the dark counts contributed by the stray light and blackbody radiation of the fiber. The Bandpass Filter is composed of 16 SiO2/Si bilayers deposited onto the backside of a thermally oxidized Si substrate. The substrate shows an excellent Bandpass Filter effect and provides a high transmittance of 88% at the central wavelength of the pass band, which is the same as that of the bare substrate. The SNSPDs fabricated on the substrate integrated with the Bandpass Filter show conspicuous wavelength-sensitive detection efficiency. The background dark count rate is reduced by two orders of magnitude to sub-Hz compared with the conventional SNSPD (a few tens of Hz). The detector exhibits a system detection efficiency of 56% at DCR of 1 Hz, with the measured minimal noise equivalent power reaching 2e-19 w/Hz1/2.
Qingxin Chu - One of the best experts on this subject based on the ideXlab platform.
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synthesis method for substrate integrated waveguide Bandpass Filter with even order chebyshev response
IEEE Transactions on Components Packaging and Manufacturing Technology, 2016Co-Authors: Kai Wang, Lei Zhu, Saiwai Wong, Guanghua Sun, Zhi Ning Chen, Qingxin ChuAbstract:A synthesis method for an even-order Chebyshev Bandpass Filter of a substrate-integrated waveguide (SIW) is proposed in this paper. The transformation of a Chebyshev polynomial is studied and applied to achieve an equal source and load termination for an even-order Filtering response. This transformed Chebyshev polynomial is used to design a millimeter-wave (mmW) SIW Bandpass Filter through electric coupling of SIW resonators or cavities. The cascaded resonators are formed by properly etching the slots on the top metal plane of a single SIW cavity, and these slots create electric coupling as desired in a Filter design. The proposed synthesis procedure of coupled-resonator Bandpass Filter with an even-order Chebyshev response is given and discussed here in detail. The theoretical and extracted external quality factor ( $Q_{E}$ ) and coupling coefficient ( $K$ ) are utilized to determine the Filter circuit dimensions. Two fourth-order Bandpass Filters are designed at 140 GHz under a Chebyshev response using magnetic coupling and electric coupling as design examples. These two Filters are used to prove the correctness of the proposed synthesis method as well as the advantages of electric coupling in mmW. In order to prove the validity, the previously proposed fourth-order Filter using electric coupling is fabricated. The Filter is fabricated in a single substrate layer using a low-temperature cofired ceramic technology and measured in a frequency band around 140 GHz. The measured results are in good agreement with simulated results.
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compact third order dual band Bandpass Filter using short circuited stubs loaded λ 4 resonator
IEEE International Wireless Symposium, 2015Co-Authors: Zhichong Zhang, Qingxin Chu, Leilei QiuAbstract:A novel short-circuited stubs loaded λ/4 resonator and its application to third-order dual-band Bandpass Filter are presented in this paper. Based on the analysis of resonance characteristics, it is found that the characteristics of the first passband can be conveniently controlled by the two loading shunt stubs, whereas that of the second passband are fixed. A third-order dual-band Bandpass Filter is designed and fabricated. Simulated and measured results are agreed with each other.
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compact ultra wideband uwb Bandpass Filter using dual stub loaded resonator dslr
IEEE Microwave and Wireless Components Letters, 2013Co-Authors: He Zhu, Qingxin ChuAbstract:A compact ultra-wideband (UWB) Bandpass Filter using dual-stub-loaded resonators (DSLR) is presented. The DSLR is analyzed by using the odd- and even- mode method. Four resonant modes can be tuned by the DSLR in 3.1 GHz - 10.6 GHz, and a pair of transmission zeros can be generated at the lower and upper stopband when the DSLR is applied to a UWB Filter. Therefore a UWB Bandpass Filter is realized with good skirt selectivity, harmonic suppression, as well as compact size. Finally the proposed Filter is simulated and fabricated. The measured results are in good agreement with the predicted one, demonstrating this structure is feasible in practical use.
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miniaturized microstrip Bandpass Filter using coupled scrlh zeroth order resonators
European Microwave Conference, 2009Co-Authors: Jianqiang Gong, Qingxin ChuAbstract:A novel miniaturized microstrip Bandpass Filter has been proposed by using coupled simplified composite right/left-handed zeroth-order resonators. The SCRLH ZOR consists of microstrip transmisson line sections, high/low-impedance short-line elements and grounded stub. Being one of the artificially metamaterials, the ZOR reonates when the phase constant equals to zero. Compared with the conventional half-wavelength resonator, the superiority of the ZOR mainly lies in its compact size. In addition, it is easy to tune the zeroth-order resonant frequency thanks to the simple structure and easy fabrication of the ZOR. In this paper, the performance and design of the ZOR is first studied in detail. Then the ZOR is exploited to devise a three-order Chebyshev coupled microstrip Bandpass Filter. Different coupling schemes are adopted including interdigital capacitor coupling for the interstages and aperture-backed dual-finger parallel-coupled line structures at the terminals, thus, the specified coupling strengths can be conveniently satisfied. Finally, a prototype device Filter operative at S-band is provided to illustrate the proposed techniques. Salient feature of the size reduction of the novel Filter is achieved (more than 70%) when compared to a conventional structure.
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tri band Bandpass Filter using stub loaded resonators
Electronics Letters, 2008Co-Authors: Fuchang Chen, Qingxin ChuAbstract:A tri-band Bandpass Filter using short and open stubs loaded resonators is presented. The first and the third passband frequencies of the tri-band Filter can be flexibly controlled by tuning the lengths of the stubs, whereas the second passband frequency is fixed. A tri-band Filter has been implemented with four transmission zeros, the Filter has good tri-passband performance at 1.57, 2.4, 3.5 GHz measured results agree well with simulated ones.
Wenjie Feng - One of the best experts on this subject based on the ideXlab platform.
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Bandpass Filter loaded with open stubs using dual mode ring resonator
IEEE Microwave and Wireless Components Letters, 2015Co-Authors: Wenjie FengAbstract:A high selectivity Bandpass Filter loaded with open stubs using dual-mode ring resonator is presented in this letter. Sixth-order passband with six transmission zeros close to the passband is realized with two open stubs and open/shorted coupled lines. The transmission zeros near the passband can be adjusted conveniently by only changing the characteristic impedances of the coupled lines. For demonstration, a planar Bandpass Filter (3 dB bandwidth 20.6%) is designed and fabricated. Good Filtering performance and high selectivity for the Filter are realized and experimentally verified.
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dual wideband Bandpass Filter using t shaped structure based on transversal signal interaction concepts
Electronics Letters, 2012Co-Authors: Jiagen Zhou, Wenjie Feng, W Q CheAbstract:A high selectivity dual-wideband Bandpass Filter using a T-shaped structure based on transversal signal-interaction concepts is proposed. Several transmission zeros close to the two passbands can be achieved due to the superposition of signals for the two transmission paths. A planar dual-wideband Bandpass Filter prototype for GPS and WLAN bands with 3 dB fractional bandwidths of 28.8 and 22.7 has been designed and fabricated.
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balun Bandpass Filter based on multilayer substrate integrated waveguide power divider
Electronics Letters, 2012Co-Authors: Wenjie FengAbstract:A compact multilayer substrate integrated waveguide (SIW) balun Bandpass Filter is proposed. A 180° reverse phase characteristic between the input/output ports can be easily achieved by the middle metal-ground of the SIW power divider. Four inductive posts are added to the multilayer SIW power divider to realise a passband. Good in-band balance performance (amplitude and phase imbalance are less than 0.35°dB and 2°) over the passband are achieved for the balun Bandpass Filter.
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ultra wideband Bandpass Filter based on transversal signal interaction concepts
Electronics Letters, 2011Co-Authors: Wenjie Feng, W Q Che, Thomas F EibertAbstract:An ultra-wideband (UWB) Bandpass Filter based on transversal signal-interaction concepts is proposed. By cascading a planar Marchand balun and two transmission lines with different electrical lengths, a new UWB Bandpass Filter (fractional bandwidth 86-111.5%) with two transmission zeros close to the passband is realised. Good agreement is observed between the simulated and measured results.
Rui P Martins - One of the best experts on this subject based on the ideXlab platform.
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a novel microstrip square loop dual mode Bandpass Filter with simultaneous size reduction and spurious response suppression
IEEE Transactions on Microwave Theory and Techniques, 2006Co-Authors: Pedro Cheong, Rui P MartinsAbstract:In this paper, a new capacitively stepped-impedance resonator(CSIR) is proposed to develop the microstrip square-loop dual-mode Bandpass Filter. Using this new design, simultaneous size reduction and spurious response suppression for the dual-mode Bandpass Filter can be achieved. An analytical formulation of this novel resonator is given in order to elucidate the spurious frequencies relocation design. Together with this formulation, a generalized dual-mode Bandpass Filter model is developed so as to ease the analysis of transmission zero and insertion loss. A prototype Filter is designed at 900MHz with 1.5% fractional bandwidth. Significant spurious suppressions up to 33 and 35 dB are measured at 1.8 and at 2.7 GHz, respectively. A circuitry size reduction of 54% is achieved when compared with that of the conventional structure. Moreover, the CSIR allows frequency tuning and, thus, a varactor-tuned Filter is designed and a measured tunable center frequency between 1.5-1.62GHz is demonstrated. Utilizing the proposed structure, not only size reduction,as well as spurious response suppression, but also center frequency tuning can be achieved.
