Title :
Wide stopband bandpass filter based on DGS slot structure
Author :
Bin Xu ; Rui Li ; Yingzeng Yin ; Junhui Wang
Author_Institution :
Nat. Key Lab. of Sci. & Technol. on Antennas & Microwaves Xidian Univ., Xi´an, China
Abstract :
A novel bandpass filter with excellent harmonic suppression performance based on dual-plane defected ground structure (DGS) is proposed. The DGS slot structure consists of two folded square loop slots and two J-shaped slots. Using this structure, the filter has a good selectivity and exhibits a wide upper stopband characteristic. The equivalent circuit is also presented in this letter. Measured results show that the filter centred at 1.575 GHz has a fractional bandwidth of about 9.2%. The attenuation is below 20 dB over a wide band from 2.2 to 20 GHz.
Keywords :
band-pass filters; band-stop filters; defected ground structures; microwave filters; DGS slot structure; J-shaped slots; dual-plane defected ground structure; equivalent circuit; frequency 2.2 GHz to 20 GHz; harmonic suppression performance; wide stopband bandpass filter; Attenuation; Band pass filters; Couplings; Filtering theory; Harmonics suppression; Microstrip filters; Resonator filters;
Conference_Titel :
Antennas, Propagation & EM Theory (ISAPE), 2012 10th International Symposium on
Conference_Location :
Xian
Print_ISBN :
978-1-4673-1799-3
DOI :
10.1109/ISAPE.2012.6409000
