Based on open stub-loaded dual- and tri-mode resonators, two miniaturized microstrip tri-band bandpass filters with good performance are presented. A pseudo-interdigital structure is introduced to realize size reduction. The 0° feed network is applied to create at least one transmission zero near the passband edge of each passband, resulting in high rejection and selectivity. The mode-splitting technique is used by combining two multi-mode resonators with electrical coupling, and the split two modes generate one passband. For demonstration, two tri-band bandpass filters with dual- and tri-mode resonators are implemented, respectively. The simulated and measured results are presented and show good agreement.
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Li et al. (2015) studied this question.
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