Abstract: A novel structure of simplified composite right/left handed transmission line(SCRLH TL) is proposed, and the f undamental formula to realize zeroth-order resonator(ZOR) using the novel structure is deduced. The pro perties of the ZOR are also expected in theory, and the experimental and the ex pected results agree well with each other. The unit cell of the ZOR consists of microstrip line and grounded stub, so it is easy to tune the zeroth-order resonant frequency, and the size of the ZOR is only 17.6% of the convent ional half-wavelength resonator in the same frequency.