Narrow-band balanced filtering network using coupled lines loaded with stubs

A novel narrow-band balanced filtering network using coupled lines loaded with stubs is proposed in this letter. Two Wilkinson power dividers using coupled lines are used to realise the six-port balanced network. Wideband common mode suppression and power division isolation can be achieved due to the loaded open/shorted stubs. A narrow-band balanced filtering network for the WLAN band is designed. Good agreements can be found between the simulation and measurement results.