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DGS resonator with two transmission zeros and its application to lowpass filter design

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2 Author(s)
Chen, Q. ; Sch. of Phys. Electron., Univ. of Electron. Sci. & Technol. of China, Chengdu, China ; Xu, J.

A novel defected ground structure (DGS) with two transmission zeros and a sharp cutoff frequency response is proposed. Both the two transmission zeros generated by the new DGS are lower than the one generated by a dumbbell-shaped DGS etched the same square area dimensions. On the basis of the proposed DGS, a lowpass filter has been designed, fabricated and measured. The filter with 3 dB cutoff frequency at 4 GHz exhibits a very sharp cutoff frequency response and an ultra wide stopband with rejection better than 25 dB from 4.2 to 23 GHz. Measured results show good agreement with simulated ones.

Published in:

Electronics Letters  (Volume:46 ,  Issue: 21 )

Date of Publication:

October 2010

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