Frequency characteristics of multiconductor microstrip modal filters

Modal filters (MFs) based on multiconductor microstrip lines are investigated for the first time in the frequency domain. The frequency dependences of |£
₂₁
| up to 10 GHz are obtained. Both computational and full-scale experiments are used. A printed circuit board with prototypes of multiconductor MFs are presented. Two-, three-, four- and five-conductor MFs are investigated. The computational experiment with and without accounting for losses both in conductors and dielectrics was carried out. Comparison and consistency of the results of computational and full-scale experiments are obtained. It is revealed that the bandwidth of considered MFs are about 0.55 GHz.