New microstrip "Wiggly-Line" filters with spurious passband suppression

By T. Lopetegi, Miguel A. G. Laso, J. Hernández, Miguel Bacaicoa, D. Benito, M. J. Garde, M. Sorolla, M. Guglielmi. 2001

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Microwave filters with improved stopband based on sub-wavelength resonators (2005, background): “been devoted to the suppression of harmonics in a wide variety of microwave circuits, including passives [6] and actives [7].”
Fractal-shaped microstrip coupled-line bandpass filters for suppression of second harmonic (2005, background): “and inter-digitized lines into conventional coupled lines [10-12].”
Spurious passband suppression in microstrip coupled line band pass filters by means of split ring resonators (2004, background): “832066 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].”
Compact second harmonic-suppressed bandstop and bandpass filters using open stubs (2006, unknown): “The corrugated [8] and wiggly [9] line”
Microstrip "wiggly-line" bandpass filters with multispurious rejection (2004, methodology): “As it was shown in [2], by applying a continuous modulation pattern to the coupled-line sections following a sinusoidal law, the undesired spurious passband can be eliminated provided the perturbation period is properly adjusted.”
Miniaturized coplanar waveguide stop band filters based on multiple tuned split ring resonators (2003, background): “of parallel coupled line filters can be efficiently rejected by periodically modulating strip width [5].”