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Ultra-wideband bandpass filter using CPW-to-microstrip coupling structure

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3 Author(s)
H. L. Hu ; Commun. & Inf. Eng. Inst., Nanjing Univ. of Posts & Telecommun., China ; X. D. Huang ; C. H. Cheng

A novel ultra-wideband bandpass filter based on a back-to-back microstrip-CPW transition structure is presented. The filter is composed of two microstrip-CPW transitions and a section of microstrip line used as a multiple-mode resonator. The filter has been investigated numerically and experimentally. Both simulated and measured results show that the filter has a good performance, including a small insertion loss, a group delay variation of less than 0.2 ns, stopband of up to 16.0 GHz at high frequencies, and an out-of-band rejection level of below -20.0 dB.

Published in:

Electronics Letters  (Volume:42 ,  Issue: 10 )