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991 results on '"Chu, Qing‐Xin"'

94. Time domain characteristics of band-notched ultrawideband antenna

Author

Yang, Ying-Ying, Chu, Qing-Xin, and Zheng, Zhi-An

Subjects
Antennas (Electronics) -- Design and construction, Time-domain analysis -- Methods, Ultra wideband technology -- Research, Correlation (Statistics) -- Methods, Pulse-duration modulation -- Methods, Business, Computers, Electronics, Electronics and electrical industries
Published
2009

96. An inline coaxial quasi-elliptic filter with controllable mixed electric and magnetic coupling

Author

Wang, Huan and Chu, Qing-Xin

Subjects
Coaxial cables -- Analysis, Magnetic fields -- Models, Magnetic fields -- Analysis, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Based on the concept of using controllable mixed electric and magnetic coupling to design planar filters in our earlier work, we propose a novel inline coaxial filter, in which the electric and magnetic coupling can be separately controlled. Due to this controllable mixed coupling, the filter can operate with a quasi-elliptic characteristic. By modifying resonator structure and inserting additional coupling components, the filter size is substantially reduced and the coupling becomes more easily controllable, thus being able to produce a highly selective filter with a compact size. In addition, asymmetric response can be easily achieved. For the N-order filter, a maximum of N - 1 finite transmission zeros can be realized. Practical designs, concerning a global system for mobile communication specification, show the advantages of this filter. Index Terms--Coaxial, elliptic filtering characteristic, inline filter, mixed coupling.

Published
2009

97. Design of compact tri-band bandpass filters using assembled resonators

Author

Chen, Fu-Chang and Chu, Qing-Xin

Subjects
Electric filters -- Design and construction, Circuit design -- Methods, Microwave wiring -- Design and construction, Resonators -- Usage, Circuit designer, Integrated circuit design, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A novel approach for designing tri-band bandpass filters with independently controllable center frequencies and improved stopband rejection characteristic is presented in this paper. The assembled resonator constructed by a stepped impedance resonator and a common half-wavelength resonator is employed to obtain tri-band response. The stepped impedance resonator is designed to operate at the first and third passbands and the other resonator is designed to operate at the second passband. Two kinds of filter configurations with cascaded and pseudointerdigital formats are proposed. Based on lossless lumped-element equivalent circuit, it is found that both filter structures can introduce transmission zeros between passbands. To verify the proposed approach, two filters are designed and fabricated, the measured results exhibit tri-band bandpass responses with high selectivity. Index Terms--Assembled resonator, bandpass filter, equivalent circuit, microstrip, stepped impedance resonator, tri-band.

Published
2009

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