A Miniaturized Integrated Passive Device On-Chip Bandpass Filter with High Selectivity for Satellite Communication System

In this paper, a high selectivity integrated passive device (IPD) on-chip bandpass filter is presented. The passband can be constructed by using a minimum number of three-order elliptic bandpass filter. By introducing the proposed stacked series-parallel structure, the BPF can be designed for good selectivity while maintaining high stopband attenuation. An IPD on-chip filter sample is fabricated with an electric length of 0.12 × 0.05 λ g². The measurement results show that the center frequency is 4.2 GHz, the fractional bandwidth is 78.6 %, the minimum inband insertion loss is 1.23 dB, and the frequency selectivity S F 20 dB and SF30dB are 1.31 and 1.39, respectively.