COMPACT MICROSTRIP DUAL-PASSBAND FILTERS BASED ON STEPPED-IMPEDANCE RESONATORS

摘要

In this article, a new coupling configuration of the stepped-impedance resonator is proposed to implement dual-passband filters with the small circuit size. We design the filter with higher selectivity based on SIR directing-coupling, cross-coupling, input and output external quality factors. Through resonance characteristics of a SIR, the second-resonant frequency can be tuned by adjusting structure parameters. The agreement between measured results and full-wave simulation prediction validates the feasible configuration of the proposed filters.