A narrow compact band pass filter with second harmonics suppression using the T‐SRR in MNG metamaterial

Abstract

ABSTRACT In this article, a new narrow band pass filter (BPF) with second harmonic suppression using triple‐split ring resonator (T‐SRR) in mu‐negative metamaterial on Teflon substrate is presented. Then by replacing the series quarter‐wavelength transmission lines with the equivalent T‐shaped line, a compact‐BPF with second harmonic suppression can be obtained. This filter shows an insertion loss of 0.47 dB and return loss of 21.8 dB with bandwidth of 10% at the center frequency of 10 GHz. Also, the experimental result for the second harmonic (S 21 ) suppression is 17.7 dB at a frequency of 14.7 GHz. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:535–538, 2014