Design of A Triple‐Band Filtering Power Divider With Unequal Power Division Ratios

In this paper, a novel triple‐band unequal filtering power divider with favorable selectivity and isolation is proposed. Through the utilization of one bandpass resonator (BPR) and two bandstop resonators (BSR), a triple‐band bandpass filtering response is achieved. The external coupling of two output ports are set to different values to achieve an unequal power division ratio. A comprehensive analysis is provided to guide the design, and subsequently, a triple‐band FPD prototype is designed, fabricated, and measured for validation. The measured results are found to be in good agreement with the simulated ones, indicating that the designed FPD operates at 1.8 GHz/2.2 GHz/2.48 GHz with the 3‐dB fractional bandwidth (FBW) of 6.4%/5.7%/3.2%, with the unequal power distribution of k = 2.