A design of the novel coupled-line bandpass filter using defected ground structure with wide stopband performance

By Jun-Seok Park, Jun-Sik Yun, D. Ahn. 2002

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Compact, low insertion-loss, sharp-rejection, and wide-band microstrip bandpass filters (2003, methodology): “In addition, comparing the new filter with some compact and low insertion-loss filters [15], [ 16 ], those filters only show gradual rejections.”
Fractal-shaped microstrip coupled-line bandpass filters for suppression of second harmonic (2005, background): “ground structures (DGSs) [9], and dielectric overlays [10].”
Spurious passband suppression in microstrip coupled line band pass filters by means of split ring resonators (2004, background): “More recently, electromagnetic bandgaps (EBGs) [1] and defected ground structures have been introduced as a means to achieve harmonic suppression in passive [2], [ 3 ] and active circuits [4].”
Dual-band bandpass filters using equal-length coupled-serial-shunted lines and Z-transform technique (2004, background): “Recent research on microwave filters is very active because of the continuous demands of high-performance circuits from modern communication and electronic systems [1]–[ 6 ].”