Abstract
A high-temperature superconducting (HTS) filter subsystem consisting of a 10-pole HTS filter with group delay self-equalization, a cryogenic low noise amplifier (LNA), and a cooling device is presented in this paper. The HTS filter has a 0.51% fractional bandwidth at 1955 MHz, simulated in Sonnet, and is fabricated using double-sided Tl2Ba2CaCu2O8 films on 0.5 mm thick LaAlO3 substrate. Measured responses show that the minimum insertion loss of the filter is 0.16 dB, and the out-of-band rejection is better than 75 dB. The slope is 27 dB MHz−1 at the low band edge and 22 dB MHz−1 at the upper band edge. The HTS filter subsystem has a gain of 19.3 dB and a noise figure (NF) of 0.8 dB. Furthermore, the phase distortion of HTS filters is considered, and an efficient design approach for self-equalized HTS filters is proposed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
He Y S, Li H, He A S, et al. HTS filter and front-end subsystem for GSM1800 wireless base station. Sci China Ser E-Tech Sci, 2002, 45: 638–645
Yin Z S, Wei B, Cao B S, et al. An HTS filter subsystem for 800 MHz mobile communication system. Int J Mod Phys B, 2005, 19: 419–422
Zhang X Q, Meng Q D, Li F, et al. A 24-pole high Tc superconducting filter for mobile communication applications. Supercond Sci Tech, 2006, 19: 398–402
Hong J S, Lancaster M J. On the development of superconducting microstrip filters for mobile communications applincations. IEEE Trans Microwave Theory Tech, 1999, 47: 1656–1663
Hong J S, McErlean E P, Karyamapudi B. High-order superconducting filter with group delay equalization. IEEE MTT-S Int, 2005: 1467–1470
Seaux J F, Courreges S, Bila S, et al. Novel superconductive self-equalized planar filter configuration for C-Band input multiplexers. Int J RF Microwave Comp-Aid Eng, 2006, 26–33
Mansour R R, Shen Y, Jolley B, et al. A 60-channel superconductive input multiplexer integrated with pulse-tube cryocoolers. IEEE Trans Microwave Theory Tech, 2000, 48: 1171–1180
Rhodes J D. Theory of Electrical Filters. London: Wiley, 1976. 105–127
Rhodes J D. A low-pass prototype network for microwave linear phase filters. IEEE Trans Microwave Theory Tech, 1970, 18: 290–300
Levy R. Filters with single transmission zeros at real or imaginary frequencies. IEEE Trans Microwave Theory Tech, 1976, 24: 172–181
Cameron R J. General coupling matrix synthesis methods for Chebyshev filtering function. IEEE Trans Microwave Theory Tech, 1999, 47: 433–442
Hong J S, Lancaster M J. Couplings of microstrip square open-loop resonators for cross-coupled planar microwave filters. IEEE Trans Microwave Theory Tech, 1996, 44: 2099–2109
Yan S L, Fang L, Zhao X J, et al. Tl2Ba2CaCu2O8 thin films for microwave filters. Chin J Low Temp Phys (in Chinese), 2005, 4: 304–309
Author information
Authors and Affiliations
Additional information
Supported by the Major State Basic Research Development Program of China (973 Program) (Grant No. 2006CB601006) and the National High Technology Research and Development Program of China (863 Program) (Grant No. 2006AA03Z213)
Rights and permissions
About this article
Cite this article
Zuo, T., Fang, L., Zhao, X. et al. HTS filter subsystem for future mobile communication system. Sci. China Ser. F-Inf. Sci. 51, 1384–1390 (2008). https://doi.org/10.1007/s11432-008-0085-2
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11432-008-0085-2