UWB　Communication　systems　demand　for　ultra-wide-band　filters　of　bandwidth　of　up　to　110%,　which　is　challenging　to　achieve　for　a　compact　and　low-cost　design　with　conventional　materials.　This　paper　presents　a　novel　ultra-wideband　(UWB)　bandpass　filter　design　using　composite　right/left-handed　transmission　line　(CRLH　TL)　structure.　In　addition,　to　further　simplify　the　design　and　reduce　the　size,　metal-insulator-metal　(MIM)　capacitors　and　stub　inductors　are　employed.　The　simulated　results　demonstrate　the　negative　permittivity　and　permeability　of　the　composite　materials　used　and　show　that　the　filter　with　an　insertion　loss　of　less　than　1.0　dB　throughout　the　pass　band　of　2.8　to　10.2　GHz.　The　variation　of　group　delay　is　around　0.20　ns　over　the　most　central　band　which　is　small　enough　for　the　filter　to　be　used　in　an　impulse　radio　UWB　system.　©　2008　IEEE.