A balanced bandpass filter (BBPF) with high common‐mode rejection (CMR) and extended differential‐mode (DM) stopband is presented. It is based on miniaturized Pi‐network ring resonators with loaded inductors. This structure permits the design of the common‐mode (CM) and DM resonances independently, which gives plenty of flexibility when designing the filter. Stubs are added along the symmetry plane to improve the CMR. A microstrip BBPF is designed at 921.7 MHz with a fractional bandwidth of 8.4% and a DM stopband of 10.13 f
0 ${{\boldsymbol{f}}}_{{\bf{0}}}$ for S21 < −30 dB. The CMR is better than −20 dB up to 10 f
0 ${{\boldsymbol{f}}}_{{\bf{0}}}$.
A novel balanced bandpass reconfigurable microstrip filter is presented, where in differential mode, the filter operates in seven different bands, and each inductor L M represents a state of frequency. The common mode rejection ration (CMRR) is better than 30 dB for all the states. The central frequency of the filter is changed by liquid metal droplets flowing along a microfluidic channel placed at the middle of the inductors L M . For demonstration, a third-order filter is designed, simulated, and fabricated, operating in the S-band. Good agreement between simulation and measurement is presented.
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