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

By Adnan Görür. IEEE transactions on microwave theory and techniques, 2004

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A Dual-Band Ring-Resonator Bandpass Filter Based on Two Pairs of Degenerate Modes (2010, background): “These zeros are created by the same nature of perturbation for a classical dual-mode filter, as discussed in [4].”
Dual-Mode Dual-Band Bandpass Filter Using Stacked-Loop Structure (2006, background): “A small square patch is attached to the corner of the loop for exciting and coupling a pair of degenerate modes, which is analyzed in detail in [6].”
Novel Dual-Mode Dual-Band Filters Using Coplanar-Waveguide-Fed Ring Resonators (2007, background): “It can be obtained from (2) and (3) as follows: (4) Based on (4), two substrates can be properly selected to facilitate the filter design.”
Wideband Microstrip Ring Resonator Bandpass Filters Under Multiple Resonances (2007, background): “Other perturbation elements include small patches and/or notches placed at the corners of square-loop [10] and hexagonal-loop resonators [11], and narrow slots etched on ground plane underneath a symmetrical ring strip conductor [12].”
Design of Novel Dual-Band Bandpass Filter with Microstrip Meander-Loop Resonator and CSRR DGS (2008, background): “Recently, the dual-mode resonator using patch [7] or loop [8] has attracted much attention in design of single band filter, which meets the demands for compact size and high-performance filters.”