Two-Port Dual-Band Filtering Network and Its Application on Filtering Antennas

This letter presents a two-port dual-band filtering network, which can be integrated with antennas for antenna applications in sub-6 GHz systems. The proposed network consists of slotline resonator and two stub groups, featuring second- third-order resonant characteristics at the lower upper frequencies. Analysis by establishing equivalent circuits is carried out to verify performance network. Moreover, 2 × array. Notice that array serves as final during integration. A prototype working 3.5 4.9 fabricated verification purposes. features sharp roll-off edges, low insertion loss, high polarization purity, wide fractional bandwidth 11.7% 13.5% GHz.