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Elliptic-type bandpass filter and bandstop notch filter inspired by metamaterial NRI-TL topology

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2 Author(s)
Islam, R. ; The Edwards S. Rogers Sr. Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON ; Eleftheriades, G.V.

Compact and highly selective filters can be implemented by loading a transmission line with series printed capacitors and shunt resonant lambda/4 stubs resembling the familiar printed negative-refractive-index transmission-line topology. Simulation and experimental results of a microstrip two-stage bandpass filter and a bandstop notch filter are presented. The four-pole bandpass filter exhibits an elliptic-type response with 3% fractional bandwidth. The microstrip bandstop notch filter exhibits a 50 dB deep stopband and a notch Q of 50. Both filters were designed at an operating frequency of 2.0 GHz.

Published in:

Electronics Letters  (Volume:44 ,  Issue: 25 )