Abstract In this paper, a novel fluid controlled phase tunable line using inkjet printed microfluidic composite right/left-handed(CRLH) trans-mission line(TL) is proposed. A CRLH-TL prototype has been inkjet-printed on a paper substrate using silver nano particle ink. In addition, a laser-etched microfluidic channel in poly methyl methacrylate(PMMA) has been integrated with the CRLH TL using inkjet- printed SU-8 as a bonding material. The proposed TL provides excellent phase-tuning capability that is dependent on the different fluidic materials used. As the fluid is changed, the proposed TL can have negative-phase, zero-phase, and positive-phase characteristics at 900 MHz and reflection coefficient is maintained to below 10 dB. The performance of the proposed TL is successfully validated using simulation and measurement results.Key words: Composite Right/Left Handed Transmission Line(CRLH TL), Inkjet Printed Electronics, Microfluidics, Metamaterial, Phase Shifterq2014rskC(t uvhwC)Rxy8/zX{x|RVy}~K%X{(No. 2014R1A2A1A11050010). w +5+MmwC(School of Electrical and Electronics Engineering, Chung-Ang University)Manuscript received September 29, 2014 ; Revised November 11, 2014 ; Accepted December 12, 2014. (ID No. 20140929-08S)Corresponding Author: Sungjoon Lim (e-mail: sungjoon@cau.ac.kr)