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A balanced dual‐band BPF with independently controllable frequencies and bandwidths
Author(s) -
Chen Lei,
Gan Yan Ni,
Wei Feng,
Zou Xin Tong,
Xiao Qin Kun
Publication year - 2019
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21699
Subject(s) - resonator , band pass filter , multi band device , physics , coupling (piping) , electrical impedance , microstrip , center frequency , passband , wideband , filter (signal processing) , topology (electrical circuits) , electronic engineering , optoelectronics , materials science , computer science , telecommunications , engineering , optics , electrical engineering , quantum mechanics , antenna (radio) , metallurgy
A balanced second‐order dual‐band bandpass filter (BPF) with independently controllable center frequencies and bandwidths based on coupled stepped‐impedance resonators (SIRs) is designed in this article. To obtain a dual‐band differential‐mode (DM) response, two pairs of SIRs with different resonant frequencies are employed in the design. The bandwidths of the two DM passbands can be independently tuned by adjusting the coupling gaps and coupling lengths of the corresponding resonators. In addition, three transmission zeros are realized to enhance the selectivity of the DM passbands. The microstrip‐slotline transition structure is utilized to achieve a wideband common‐mode (CM) suppression. Moreover, the DM responses are independent of the CM ones, which significantly simplify the design procedure. Finally, a balanced dual‐band BPF is designed to validate the design method and a good agreement between the simulated and measured results is observed.