Synthesis method of lumped dual-band filters with controllable bandwidths

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• 作者：Yun Liu ; Yao Chen ; Xiyang Miao ; Chenwei Cui and Yijun Tang
• 关键词：lumped dual-band filter ; dual-mode J inverter ; controllable bandwidths
• 刊名：International Journal of RF and Microwave Computer-Aided Engineering
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：25
• 期：1
• 页码：75-80
• 全文大小：332K
• ISSN：1099-047X

文摘

This article presents a synthesis method for lumped dual-band filters by directly adopting traditional Pi-shaped and Г-shaped capacitive networks as dual-mode admittance inverters (J inverters). By following classic coupled-resonator filter theory, the equivalent circuits (parallel LCs) of the dual-mode resonators between the J inverters are derived separately at the two passbands. Each dual-mode resonator is first approximately constructed with a series combination of the two parallel lumped circuit (LC) resonators, and then the element values are iteratively updated for better accuracy. A design example is given and good agreement is achieved between the simulated and measured results, demonstrating the feasibility of the synthesis method. The passband bandwidths are fully controllable.