A hybrid microstrip-to-short circuited CPW based UWB bandpass filter

Abstract

Presented in this manuscript is an Ultra-Wideband (UWB) bandpass filter (BPF) based on broadside coupling of microstrip-to-short circuited coplanar waveguide (CPW). The short circuited CPW in ground is of non-uniform nature and impedances of its individual sections are varied accordingly to place the resonant modes within the UWB spectrum. The optimal design of microstrip lines on the top enhance its coupling with CPW and generates the UWB passband with good return/insertion loss and extended stopband. The compact structure measures 15×12.6 in dimensions.