Abstract
In this article, a balanced microstrip dual-band bandpass filter (BPF) is designed. The proposed filter is achieved by employing a microstrip U-shape half-wavelength resonator, a folded stub-loaded resonator and balanced microstrip/slotline transition structures. The center frequencies and the fractional bandwidths of the two differential-mode (DM) passbands can be controlled independently by changing the physical lengths of the two resonators and the gaps between each resonator, respectively. The balanced microstrip/slotline transition structures can achieve a wideband common-mode (CM) suppression. Meanwhile, the DM passbands are independent from the CM responses, which significantly simplify the design procedure. In addition, a wide DM stopband is also realized. In order to validate the design strategies, a balanced dual-band BPF centered at 2.57 and 3.41 GHz was fabricated and a good agreement between the simulated and measured results is observed.
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