Control of bandstop response of Hi-Lo microstrip low-pass filter using slot in ground plane

By A. Abdel-Rahman, A. Verma, A. Boutejdar, A. Omar. IEEE transactions on microwave theory and techniques, 2004

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Miniaturized microstrip lowpass filter with wide stopband using double equilateral U-shaped defected ground structure (2006, background): “In fact, these DGS elements with uniform dimensions are cascaded in a one-dimensional (1-D) periodic pattern [2]‐[ 4 ] in order to realize wider stopband even the passband ripple is concerned.”
Mutual Coupling Reduction Between Microstrip Patch Antennas Using Slotted-Complementary Split-Ring Resonators (2010, unknown): “frequency range [10].”
A novel defected ground structure for planar circuits (2006, methodology): “2, the simulated -parameters of this DGS are compared with the conventional DGS [2] having the same resonance frequency (see Table I).”
Defected Ground Structure: Fundamentals, Analysis, and Applications in Modern Wireless Trends (2017, background): “These shapes include rectangular dumbbell [40], circular dumbbell [41], spiral [30], “U” [14], “V” [14], “H” [42], cross [15], and concentric rings [43].”
Small Ultra-Wideband (UWB) Bandpass Filter With Notched Band (2008, unknown): “Based on traditional DGS unit structure [11]–[13],”