Multi-coupled-resonator dual-band bandpass microstrip filters with non-resonating nodes

Summary form only given, as follows. The usage of non-resonating nodes to develop high-selectivity dual-passband microstrip filters is reported. These nodes are employed as crosscoupling paths to increase the inter-resonator signal interactions. Two planar implementations for the non-resonating node are shown. Also, they are validated through two different 1.1/1.4-GHz high-order dual-passband filter examples designed at the coupling-matrix level. Simulations and measurements of their associated built microstrip circuits are given.