NDLI: A dual-mode dual-band bandpass filter using a single ring resonator

Content Provider	IEEE Xplore Digital Library
Author	Sha Luo Lei Zhu Sheng Sun
Copyright Year	2009
Description	Author affiliation: School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore (Sha Luo; Lei Zhu; Sheng Sun)
Abstract	A dual-mode dual-band bandpass filter with two transmission poles in both of dual-passbands is presented with the proper stub-loading and external-excitation of a single microstrip ring resonator. By placing two excited ports at the 135°-separated positions along a uniform ring resonator, two $1^{st}order$ degenerate modes, TM and TM, can be simultaneously excited and they are split to produce two transmission poles in the $1^{st}$ passband. Meanwhile, two $2^{nd}-order$ degenerate modes, TM and TM, are split by attaching four identical open-circuited stubs to the ring in a symmetrical manner with respect to two external ports. Thus, two transmission poles can be generated in both of dual passbands as demonstrated in theory. Finally, a compact dual-band ring resonator filter is designed and fabricated to operate at 2.3 and 4.8 GHz and its predicted results are verified in experiment.
Starting Page	921
Ending Page	924
File Size	832795
Page Count	4
File Format	PDF
ISBN	9781424428014
DOI	10.1109/APMC.2009.5384317
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-12-07
Publisher Place	Singapore
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dual band Band pass filters Optical ring resonators Passband Resonator filters Microstrip filters Microstrip resonators Resonance Impedance Circuits open-circuited stubs Bandpass filter dual-mode dual-band ring resonator
Content Type	Text
Resource Type	Article

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