Dual-mode quasi-elliptic-function bandpass filters using ring resonators with enhanced-coupling tuning stubs

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Tunable microstrip bandpass filters with two transmission zeros (2003, background): “Fig. 7 shows the measured results of the filter for the case of mm and mm. This filter with shows an undercoupled condition [7], [ 8 ], which does not have a hump in the passband.”
Wideband Microstrip Ring Resonator Bandpass Filters Under Multiple Resonances (2007, background): “, enhanced side-coupling [20], line-to-ring coupling [15], [17], [21], [22], and interdigital coupling schemes [23].”
A Dual-Band Ring-Resonator Bandpass Filter Based on Two Pairs of Degenerate Modes (2010, unknown): “, line-toring coupling [8], enhanced side-coupling [9], meander-line”
Compact, low insertion-loss, sharp-rejection, and wide-band microstrip bandpass filters (2003, methodology): “To reduce the high insertion loss, filters used an enhanced coupling structure or lumped capacitors were proposed [3]‐[ 7 ].”
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, methodology): “Consequently, dual-mode microstrip filters have been widely used in wireless communications systems because of their advantages in applications requiring high-quality narrow-band microwave bandpass filters with features such as small size, low mass, and low loss.”