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A novel tunable single-to-balanced bandpass filter is proposed in this letter. It consists of pairs of stepped-impedance resonators (SIRs), which are connected by back-to-back varactors in between. Based on such a simple structure, the filter can cover from 1.5 GHz to 1.9 GHz with constant absolute bandwidth, and exhibit differential outputs in each tuning state. The amplitude and phase imbalances...
A novel miniaturized four-section stepped impedance resonators (SIR) filter is presented. The size of the miniaturization SIR band-pass filter (BPF) reduces to 75% of the size of conventional hairpin SIR BPF by utilizing space effectively and using multi-section impedance technology. The simulation shows novel filter can achieve near performances compared with conventional hairpin SIR filter but with...
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