Ultra-wideband bandpass filter with hybrid quasi-lumped elements and defected ground structure

2007 ◽  
Vol 1 (3) ◽  
pp. 733 ◽  
Author(s):  
G.M. Yang ◽  
R. Jin ◽  
J. Geng ◽  
X. Huang ◽  
G. Xiao
Keyword(s):  
Bandpass Filter ◽  
Ultra Wideband ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Lumped Elements

Planar microstrip UWB bandpass filter with quad notched bands and high selectivity

2021 ◽  
Vol 14 ◽  
Author(s):  
Mingming Gao ◽  
Keda Xu ◽  
Jingchang Nan ◽  
Li Wang
Keyword(s):  
High Selectivity ◽  
Bandpass Filter ◽  
The Other ◽  
Ultra Wideband ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Notched Band ◽  
Quad Notched Bands ◽  
Mode Resonator ◽  
Insufficient Number

Background: Aiming at solving the problems of large design size and insufficient number of 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 c an 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.

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