Calibration of optimized minimum inductor bandpass filter with controllable bandwidth and stopband rejection

A calibration methodology for the optimized minimum inductor (OMI) bandpass filter (BPF) to compensate passive components' inherent loss, such as resistances and reactances, is presented. OMI BPF prevails conventional elliptic and Chebyshev BPFs by introducing fewer inductors for the same stopband rejection requirement. Given design specifications (bandwidth, stopband rejection) at a specific center frequency, the calibration flow optimizes the approach to offset the inaccuracy of center frequency, bandwidth, and stopband rejection due to the discrepancy between the actual and ideal prototype passive components. Two OMI BPF designs before and after calibration are presented for demonstration and comparison. They are 1) a 3rd order centered at 2.388 GHz, 35.54% fractional bandwidth (FBW), 29.97 dB stopband rejection, and 2) a 7th order centered at 2.333 GHz, 17.40% FBW, 62.29 dB stopband rejection. •A calibration methodology for the optimized minimum inductor (OMI) bandpass filter (BPF) to compensate passive components' inherent loss, such as resistances and reactances, is presented.•The OMI BPF prevails conventional BPFs by introducing fewer inductor or better performance of stopband rejection.•The calibration flow optimizes the approach to offset the inaccuracy of center frequency, bandwidth, and stopband rejection due to the discrepancy between the actual and ideal prototype passive components.•Two OMP BPF examples demonstrated exemplary performance in high center frequency, wide bandwidth, and high stopband rejection.