A wide-band microstrip bandpass filter (BPF) based on the improved composite right/left-handed transmission line (CRLH-TL)\nstructure is presented in this paper.Compared to the traditional CRLH-TL with via hole, the improved one is an all-planar structure,\nwhich owns the advantage of fabrication and loss. The equivalent lossless LC circuit model of the proposed structure is established.\nEM software Sonnet is adopted to design the wide-band filter with bandwidth of 1.4GHz (from 1.9GHz to 3.3GHz). The circuit\noccupies only 20.6 Ã?â?? 12.8mm2. Finally, the fabrication and measurement are implemented. A good agreement between simulation\nand measured results verifies the validity of the design methodology.
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