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Planar Microstrip UWB Bandpass Filter with Quad Notched Bands and High Selectivity

[ Vol. 14 , Issue. 4 ]

Author(s):

Mingming Gao, Keda Xu*, Jingchang Nan and Li Wang   Pages 493 - 499 ( 7 )

Abstract:


Background: This study aims at solving the problems of large design size and insufficient number of the notched band for traditional ultra-wideband (UWB) filters. A planar compact microstrip UWB bandpass filter (BPF) with quad notched bands and good selectivity is proposed using a modified multiple-mode resonator (MMR) and defected ground structure (DGS).

Methods: The MMR consists of a stepped impedance stub above and two pairs of open-circuited stubs on both sides, which can generate the passband and double notched bands of UWB filter, the other two notched bands are obtained by DGS.

Results: The UWB filter with quad notched bands respectively centered at 3.9 GHz, 5.7 GHz, 7.9 GHz, and 9.8 GHz is fabricated and measured.

Conclusion: The measured results are basically consistent with the simulated results, which proves the correctness and practicability of the UWB filter.

Keywords:

Filter, ultra-wideband, multiple-mode resonator, defected ground structure, notched band, resonance frequency.

Affiliation:

School of Electrics and Information Engineering, Liaoning Technical University, Huludao, School of Electrics and Information Engineering, Liaoning Technical University, Huludao, School of Electrics and Information Engineering, Liaoning Technical University, Huludao, School of Electrics and Information Engineering, Liaoning Technical University, Huludao

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