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A balanced ultra‐wideband bandpass filter based on H‐type sandwich slotline
Author(s) -
Sun Jing,
Li Guang Rui
Publication year - 2021
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.22611
Subject(s) - passband , band pass filter , bandwidth (computing) , wideband , ultra wideband , filter (signal processing) , electronic engineering , materials science , microstrip , fractional bandwidth , common mode signal , topology (electrical circuits) , computer science , optoelectronics , physics , acoustics , engineering , telecommunications , electrical engineering , digital signal processing , analog signal
In this paper, a balanced ultra‐wideband (UWB) band‐pass filter (BPF) with compact size and simple structure is proposed. The proposed filter is fed by microstrip‐slotline transition structures. A UWB differential‐mode (DM) passband is achieved by employing H‐type sandwich slotline structure. The fractional bandwidth of proposed balanced BPF could reach as much as 132%. In order to improve the selectivity, a source‐load coupling is introduced. Meanwhile, one more layer of substrate is employed to reduce the DM passband insert loss. In addition, due to the symmetrical structure, a high UWB common‐mode suppression without influencing the DM passband is realized. Therefore, the filter design method can be simplified significantly. In order to validate the effectiveness of the design method, a balanced UWB BPF is fabricated and the simulated results agree well with the measured ones.