There are a number of models of microstrip gap capacitance in the literature. Using an accurate model of the gap capacitance developed by Kirschning, Jansen and Koster ( 1983 MTT-S Digest, pp 495 – 497) a script was used to calculate the series gap capacitance with respect to the gap. The microstrip parameters used were: width of both microstrips=1mm, height of the microstrip above the ground plane = 1mm, dielectric constant = 4.0 and at a frequency of 1Ghz. The results are presented below in graphical form. For more details and information on this topic and others please visit http://www.signalpro.biz.