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access icon free Balanced dual-band BPF with intrinsic common-mode suppression on double-layer substrate

A balanced dual-band bandpass filter (BPF) with enhanced common-mode (CM) suppression is proposed. The dual-band differential-mode (DM) bandpass response is obtained using a double-layer substrate. The stub-loaded stepped-impedance resonators are used both in the top and the bottom layers to constitute a dual-band BPF with two controllable passbands. The slotline portion in the middle layer is excited under DM operation. Moreover, the even-symmetrical field along the slotline is highly attenuated under CM excitation, thus achieving excellent CM suppression over the desired DM passbands. To verify the proposed concept, a balanced dual-band BPF, operating at 1.9 and 2.8 GHz, is designed and fabricated, and the simulated and measured results are in good agreement.

References

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      • 8. Lee, J.R., Cho, J.H., Yu, S.W.: ‘New compact bandpass filter using microstrip λ/4 resonators with open stub inverter’, IEEE Microw. Wirel. Compon. Lett., 2000, 10, (12), pp. 523527.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2015.0327
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content/journals/10.1049/el.2015.0327
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