Compact Balanced Dual-Band Bandpass Filter With High Common-Mode Suppression Using Planar Via-Free CRLH Resonator

A novel planar via-free composite right-/left-handed resonator with an interdigital capacitor and meander microstrip line is proposed in this letter. Under differential-mode (DM) excitation, the quasi-lumped resonator is virtually connected to ground, and it exhibits dual-mode characteristics. Moreo...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2018-11, Vol.28 (11), p.996-998
Main Authors: Song, Yi, Liu, Hai Wen, Zhao, Weilong, Wen, Pin, Wang, Zhengbiao
Format: Article
Language:English
Subjects:
Balanced
Band-pass filters
Bandpass filters
Capacitors
common-mode (CM) suppression
compact
composite right-/left-handed (CRLH)
Dual band
dual-band filter
Excitation
Integrated circuit modeling
Microstrip
Microstrip transmission lines
Resonators
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Summary:A novel planar via-free composite right-/left-handed resonator with an interdigital capacitor and meander microstrip line is proposed in this letter. Under differential-mode (DM) excitation, the quasi-lumped resonator is virtually connected to ground, and it exhibits dual-mode characteristics. Moreover, two DMs can be tuned independently in an appropriate way. Under common-mode (CM) excitation, CM resonant modes are away from DM resonant modes, which contributes to the excellent CM suppression without additional circuits. Based on this resonator with compact size, CM suppression ability, and dual-mode DM characters, a balanced dual-band bandpass filter is analyzed and fabricated. Finally, simulated and measured results verify this design method.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2018.2873240