摘要

In this article, a novel compact dual-band bandpass filter with controllable bandwidths is presented. A set of central-loaded resonators are employed to generate dual band responses. Three coupled-capacitors, loaded at the corresponding voltage-zero points of the resonators, are utilized to control the coupling coefficients of two bands separately. Besides, two extra series capacitors, between feed lines and resonators, are adopted to simultaneously achieve the desired external quality factors of dual passbands. Thus, the bandwidths of the dual bands can be independently controlled.

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