A wideband filtering power divider (PD) with high selectivity is introduced, based on a terminated coupled line structure. The bandwidth tuning, isolation and impedance matching performances optimisation are presented and explained. Finally, the filtering PD is designed and implemented with a centre frequency ( f 0 ) of 3.0 GHz and a fractional bandwidth of 70%. The upper stopband is achieved up to 2.6 f 0 , with a rejection of better than 13 dB. The measured minimum in‐band insertion loss is 0.3 dB (not including the splitting loss). Isolation of higher than 16.7 dB between the output ports is observed up to 2.7 f 0 .