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Your search keyword '"Zhu, Z.-L."' showing total 10 results
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10 results on '"Zhu, Z.-L."'

1. Design of Dual-Mode Loop Resonator-Based Microwave Diplexers with Enhanced Performance

Author

Zhu, Z. L. and Li, J. L.

Subjects
dual-mode resonator, Microwave diplexer, loop resonator, microstrip resonator, Electrical and Electronic Engineering
Abstract

In this paper, a dual-mode loop resonator based circuit topology is studied for microwave diplexer applications. Several diplexers, with dense and sparse channel separations, are further discussed based on the introduced topology, featuring capable of controlling transmission zeros flexibly. Hence microwave diplexers with high selectivity and good channel isolation can be realized by placing transmission zeros of the channel filters at the desired channels. With the use of the proposed topology, the achieved center frequency ratio between two channels can be from 1.03 to 1.35 with good isolations, high selectivity and compact size. The demonstration diplexers are realized on PCB processes, but can be implemented with other media including MMIC. Experimental validations on the developed demonstrator are presented in the paper, and measured responses match well the full-wave electromagnetic simulated results. The developed UMTS diplexer demonstrator achieves the measured minimum passband insertion losses of 2.55 and 2.7 dB with return losses better than 15 dB and channel isolations over 40 dB at the two channels.

Published
2022

2. Ho∶YbGG Polycrystal Powder Synthesized by Low Temperature Combustion Method and Its Luminescent Characteristics

Author

C Sun, Y Zhang, and Zhu Z.-L.

Subjects
Ytterbium, Radiation, Materials science, Absorption spectroscopy, Analytical chemistry, chemistry.chemical_element, Condensed Matter Physics, Mole fraction, Photon upconversion, Electronic, Optical and Magnetic Materials, chemistry, Gallium, Absorption (electromagnetic radiation), Luminescence, Holmium
Abstract

Holmium doped ytterbium gallium garnet (Ho:YbGG) polycrystal powder was synthesized by low temperature combustion method using citric acid as combustion agent. The mole fraction of Ho3+ was 2%. The Ho:YbGG polycrystal powder was determined by X-ray diffraction analysis and SEM analysis. The results show that 900 is the optimum calcination temperature. The absorption spectrum of the sample shows that the absorption peaks of Ho3+ are centered at 536 nm and 645 nm, corresponding to 5I85F4 (5S2) and 5I85F5 level transitions, respectively. The strong absorption bands of Ho3+ are centered at 940 nm and 982 nm, corresponding to 2F5/22F7/2 level transition. The fluorescence spectra of the samples show that the strong emission band of Ho3+ is centered at 1 989 nm, corresponding to 5I75I8 level transition. The upconversion spectrum of the sample was tested and the corresponding conversion mechanism was analyzed. Ho:YbGG can emit strong green and red light under 980 nm LD excitation, which are corresponding to 5F4(5S2)5I8 and 5F55I8 level transitions of Ho3+.

Published
2014

3. Regional nitrogen budgets and riverine N & P fluxes for the drainages to the North Atlantic Ocean: Natural and human influences

Author

Howarth, R. W., Billen, G., Swaney, D., Townsend, A., Jaworski, N., Lajtha, K., Downing, J. A., Elmgren, R., Caraco, N., Jordan, T., Berendse, F., Freney, J., Valery Kudeyarov, Murdoch, P., and Zhu, Z. -L

Subjects
Temperate, WIMEK, Nitrogen, Phosphorus, Atmospheric deposition, Eutrophication, Pristine, Anthropogenic, P ratio [N], Fertilizer, Tropical, Nitrogen fixation, Rivers, Nitrogen budget, N:P ratio, Terrestrial Ecology and Nature Conservation, Terrestrische ecologie en natuurbeheer, Environmental Chemistry, Earth-Surface Processes, Water Science and Technology
Published
1996

7. psi(2S) Radiative Decay Measurements

Author

Ablikim, Medina, Bai, J. Z., Bai, Y., Ban, Y., Cai, X., Chen, H. F., Chen, He Sheng, Chen, H. X., Chen, J. C., Chen, Jin, Chen, X. D., Chen, Y. B., Chu, Y. P., Dai, Y. S., Deng, Z. Y., Du, S. X., Fang, J., Fu, C. D., Gao, C. S., Gao, Y. N., Gu, S. D., Gu, Y. T., Guo, Y. N., Guo, Z. J., Harris, F. A., He, K. L., He, M., Heng, Y. K., Hou, J., Hu, H. M., Hu, T., Huang, G. S., Huang, X. T., Huang, Y. P., Ji, X. B., Jiang, X. S., Jiao, J. B., Jin, D. P., Jin, S., Lai, Y. F., Li, Hai-Bo, Li, J., Li, R. Y., Li, W. D., Li, W. G., Li, X. L., Li, X. N., Li, X. Q., Liang, Y. F., Liao, H. B., Liu, B. J., Liu, C. X., Liu, Fang, Liu, Feng, Liu, H. M., Liu, J. P., Liu, H. B., Liu, J., Liu, Q., Liu, R. G., Liu, S., Liu, Z. A., Lu, F., Lu, G. R., Lu, J. G., Lundborg, A., Luo, C. L., Ma, F. C., Ma, H. L., Ma, L. L., Ma, Q. M., Malik, M. Q. A., Mao, Z. P., Mo, X. H., Nie, J., Olsen, Stephen L., Ping, R. G., Qi, N. D., Qin, H., Qiu, J. F., Rong, G., Ruan, X. D., Shan, L. Y., Shang, L., Shen, C. P., Shen, D. L., Shen, X. Y., Sheng, H. Y., Sun, H. S., Sun, S. S., Sun, Y. Z., Sun, Z. J., Tang, X., Tian, J. P., Tong, G. L., Varner, Gary Sim, Wan, X., Wang, L., Wang, L. L., Wang, L. S., Wang, P., Wang, P. L., Wang, W. F., Wang, Y. F., Wang, Z., Wang, Z. Y., Wei, C. L., Wei, D. H., Weng, Y., Wiedner, Ulrich, Wu, N., Xia, X. M., Xie, X. X., Xu, G. F., Xu, X. P., Xu, Y., Yan, M. L., Yang, H. X., Yang, M., Yang, Y. X., Ye, M. H., Ye, Y. X., Yu, C. X., Yu, G. W., Chang-Zheng Yuan, Yuan, Y., Zang, S. L., Zeng, Y., Zhang, B. X., Zhang, B. Y., Zhang, C. C., Zhang, D. H., Zhang, H. Q., Zhang, H. Y., Zhang, J. W., Zhang, J. Y., Zhang, X. Y., Zhang, Y. Y., Zhang, Z. X., Zhang, Z. P., Zhao, D. X., Zhao, J. W., Zhao, M. G., Zhao, P. P., Zhao, Z. G., Zheng, H. Q., Zheng, J. P., Zheng, Z. P., Zhong, B., Zhou, L., Zhu, K. J., Zhu, Q. M., Zhu, X. W., Zhu, Y. C., Zhu, Y. S., Zhu, Z. A., Zhu, Z. L., Zhuang, B. A., and Zou, Bing-Song

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