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High selectivity lowpass filter using negative-e metamaterial resonators

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3 Author(s)
Ali, A. ; Sch. of Electr. & Electron. Eng., Univ. of Manchester ; Khan, M.A. ; Hu, Z.

A binomial lowpass filter provides the flattest passband response but slow attenuation transition. Presented is a design for improving roll-off performance based on the negative-epsiv property of complementary split ring resonators, while maintaining filter passband performance with smaller size. Measured results indicate that the proposed structure achieves a flat passband with no ripples as well as having a selectivity of 32 dB/GHz. This significantly exceeds the 17 dB/GHz selectivity of the conventional design. Furthermore, the proposed filter has a smaller size by 16%

Published in:

Electronics Letters  (Volume:43 ,  Issue: 9 )