Dual-mode stepped-impedance ring resonator for bandpass filter applications

By M. Matsuo, H. Yabuki, M. Makimoto. 2001

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Wideband Microstrip Ring Resonator Bandpass Filters Under Multiple Resonances (2007, methodology): “In addition, this technique can facilitate accurate fabrication of the entire filter circuit without needing to solder lumped capacitors [ 7 ], [12].”
A Dual-Band Ring-Resonator Bandpass Filter Based on Two Pairs of Degenerate Modes (2010, methodology): “A simple stepped-impedance ring resonator was proposed in [ 6 ] to control the coupling strength of the two fundamental degenerate modes.”
Description of coupling between degenerate modes of a dual-mode microstrip loop resonator using a novel perturbation arrangement and its dual-mode bandpass filter applications (2004, background): “As is well known, a bandpass filter based on a dual-mode resonator can achieve Chebyshev, elliptic, or quasi-elliptic responses if the feed lines, notches, or stubs are properly arranged [2]–[ 6 ].”
Quarter-Wavelength Side-Coupled Ring Resonator for Bandpass Filters (2008, background): “A general microstrip ring resonator consists of a pair of feed lines, coupling gaps, and a ring whose circumference is equal to the guided wavelength [see Fig.”