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

(E-pub Ahead of Print)

Author(s): Mingming Gao, Keda Xu*, Jingchang Nan, Li Wang

Journal Name: Recent Advances in Electrical & Electronic Engineering
Formerly Recent Patents on Electrical & Electronic Engineering

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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 3.9GHz, 5.7GHz, 7.9GHz, and 9.8GHz 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.

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Article Details

(E-pub Ahead of Print)
DOI: 10.2174/2352096514666210118141959
Price: $95