Design and analysis of a X-shaped wideband composite right/left-handed transmission line

On purpose of actualizing wideband right/left-handed transmission line，a composite right/left-handed transmission line（CRLH-TL)with anti symmetric X-shaped periodicity structure was proposed and designed.The equivalent circuit model of CRLH-TL was set up firstly，and its resonance property was validated through the extracted values of the equivalent circuit components and the simulated S parameters of CRLH-TL.Moreover，the constitutive parameters were extracted and analyzed by using inversion algorithm to demonstrate that the proposed structure working with 1.6 GHz frequency band width，on which it presented left-handed properties at 10.08~10.9 GHz，while with right-handed properties at 9.3~10.08 GHz，and it is a wideband CRLH-TL.At last，the CRLH-TL was fabricated with printed circuit board，and a parallel-plate waveguide（PPW)measurement system was employed to test the S parameters of the CRLH-TL. The testing results are constant with the simulation results in general，which demonstrats the validity of the proposed CRLH-TL.This provids a valid method to the design and analysis for CRLH-TL.