In this letter, a compact second-order balanced microstrip bandpass filter (BPF) with high selectivity and common-mode (CM) suppression performances is presented based on the magnetically coupled resonators. Under differentialmode (DM) operation, a transmission zero (TZ) near the passband can be created by the frequency-dependent coupling between two resonators. Meanwhile, the intrinsic high CM suppression performance can be maintained due to the magnetically coupling between two resonators und
