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Dual-Band coupled-line Bandpass Filter with Independently Tunable Bandwidths

China Communications 2016年第9期13卷 60-64页

作者： Yongle Wu Lixia Nan Lingxiao Jiao Weimin Wang Yuanan Liu Beijing Key Laboratory of Work Safety Intelligent Monitoring School of Electronic EngineeringBeijing University of Posts and Telecommunications

This paper reports a novel dual-band coupled-line bandpass *** a quadruple-mode coupled-line resonator,this proposed filter could filter signals on two frequency *** introducing two varactors,one of the four resonances could be continuously altered by changing the capacitance of the varactors,thus the two frequency bandwidths could be independently *** this paper,the detailed explanation for its operation is given,and the agreement between the expected and practical performance sufficiently confirms the robustness and effectiveness of this proposed filter.

关键词： filters tunable dual band coupled line

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Planar Compact Dual-Band coupled-line Balun with High Isolation

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China Communications 2017年第2期14卷 40-48页

作者： Weiwei Zhang Yongle Wu Weimin Wang Xiaochuan Shen Beijing Key Laboratory of Work Safety Intelligent Monitoring School of Electronic EngineeringBeijing University of Posts and Telecommunications Beijing 100876 China

A planar circuit structure, which is based on three cascaded pairs of coupled lines, an open stub, and an isolation resistor, is proposed in this paper to design a compact *** balun with high isolation. This circuit features equal power division with out of phase, all ports matching, high isolation between two outputs, compact structure, and inherent impedance transformation. The closedform design equations are derived based on the traditional *** theory and even.(odd.) mode analysis. A practical *** balun, which operates at 0.9/1.8GHz, is designed and fabricated to validate the function of equal power division with out of phase and high isolation between two outputs. The consistency between the simulated and measured results verify the design theory.

关键词： balun dual band coupled line high isolation

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维普期刊数据库

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A novel model for a planar wideband Marchand balun

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Journal of Semiconductors 2011年第11期32卷 122-126页

作者：徐雷钧王志功李芹 School of Electrical and Information Engineering Jiangsu University Institute of RF-& OE-ICs Southeast University

A new lumped element model for conventional Marchand baluns is presented. Analyzed by the even- and odd-mode method, the equivalent equations are derived for ）./4 coupled lines. Based on the proposed 5th-order lumped equivalent circuit for ）./4 coupled lines, the self-inductance, mutual inductive coupling and the capacitance can be calculated according to the even- and odd-mode characteristic impedance, therefore, the model parameters of the balun can be easily gained from the derived equations. To verify the model, a GaAs monolithic wideband Marchand balun was implemented and tested. The EM simulation and experimental results show a good agreement with the model simulation. This model is available in a wide frequency range and makes the design procedure of the Marchand balun faster and easier.

关键词： model wideband coupled line MMIC Marchand balun

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维普期刊数据库

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