Velázquez Ahumada, María del CastilloMartel Villagrán, JesúsMedina Mena, Francisco2020-06-262020-06-262004Velázquez Ahumada, M.d.C., Martel Villagrán, J. y Medina Mena, F. (2004). Parallel coupled microstrip filters with ground-plane aperture for spurious band suppression and enhanced coupling. IEEE Transactions on Microwave Theory and Techniques, 52 (3), 1082-1086.0018-94801557-9670https://hdl.handle.net/11441/98328Parallel coupled microstrip sections with a slotted ground plane are proposed as building blocks of coupled-line microstrip filters with enhanced performance. It is shown that, by proper adjustment of the ground-plane slot dimensions, the double frequency spurious band associated with unequal even/odd electrical lengths can be suppressed or meaningfully reduced. As an additional feature, this simple design relaxes tolerances of strip width and spacing in those cases where tightly coupled high-impedance sections are required. A rough preliminary design can be obtained within a few seconds using a fast optimization algorithm based on a quasi-TEM analysis of the coupled sections. Fine tuning is based on the use of a commercial electromagnetic simulator. Finally, experimental check of filter performance is provided.application/pdf5 p.engAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Coupled-line microstrip filtersSlotted ground planeSpurious response suppressioninfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://doi.org/10.1109/TMTT.2004.823593