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

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

Volume 14 , Issue 4 , 2021

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Graphical 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.

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Article Details

Year: 2021
Published on: 18 January, 2021
Page: [493 - 499]
Pages: 7
DOI: 10.2174/2352096514666210118141959

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