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
(120.2440) Instrumentation, measurement, and metrology : Filters
(230.7020) Optical devices : Traveling-wave devices
(350.4010) Other areas of optics : Microwaves
(350.3618) Other areas of optics : Left-handed materials
(160.3918) Materials : Metamaterials
Original Manuscript: May 3, 2012
Revised Manuscript: June 18, 2012
Manuscript Accepted: June 18, 2012
Published: September 25, 2012
Chong-Min Lee, Woo-Seok Shim, Yong Moon, and Chul-Hun Seo, "Design of Ultra-wide Band-pass Filter Based on Metamaterials Applicable to Microwave Photonics," J. Opt. Soc. Korea 16, 288-291 (2012)
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