Abstract
We designed an ultra-wide band-pass filter applicable to microwave reflectometry for
KSTAR (Korea Superconducting Tokamak Advanced Research) and to microwave photonics. The proposed
ultra-wide band-pass filter exhibits a metamaterial structure characterized by a wide band, low
insertion loss, and high skirt selectivity. The proposed filter is applied to enhance the linearity
of reflectometry at the output of a VCO (voltage controlled oscillator). The pass-band of the
proposed filter is observed at 18~28 GHz, and the out-of-band rejection is below 20 dB. Further, we
constructed an unwrapped negative phase of S(2, 1) to verify the characteristics of the
metamaterial. The under- and upper-band at lower limits of the pass-band are left- and right-handed,
respectively. The group delay of the filter is less than 0.5 ns.
© 2012 Optical Society of Korea
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