Broadside-coupled rectangular resonators in suspended stripline with single and double dielectrics

The rigorous spectral domain method is applied to analyse the resonant frequency characteristics of rectangular resonators in three broadside-coupled suspended stripline configurations. These are (a) broadside-coupled suspended stripline with a single dielectric, (b) broadside-coupled suspended stripline with double dielectrics and (c) broadside-coupled suspended stripline with double inverted dielectrics. Computed dominant even-and odd-mode resonant frequencies of rectangular resonators in the above broadside-coupled configurations are presented as a function of various structural parameters. These characteristics are distinct from those obtained for conventional edge-coupled microstrip resonators. The computed resonant frequencies using simple basis functions are compared with the experimental values in the frequency range 5–13 GHz. The results presented in this paper should find application in the design of microwave and millimeter wave integrated circuit components.