Abstract:A Composite Right/Left-Handed Transmission Line(CRLH TL) structure based on probe-loaded Complementary Split-Ring Resonator(CSRR) is proposed in this paper. Based on the resonant characteristic of CSRR and CRLH structure, the transmission zeros are introduced and the size of the filter is reduced by extending the length of CRLH coupling slot and by increasing the number of short-circuit probes in CSRR. The filter is designed with wide bandwidth, high selectivity and miniaturization. The prototype of the band-pass filter is fabricated. The overall size of the prototype is 30 mm×15 mm×1.35 mm. The test results show that the center frequency and insertion loss of the filter are 6.6 GHz and 0.65 dB respectively, and the 3 dB bandwidth of the filter is 9.3 GHz. The filter shows a good application value in microwave systems such as wireless communication and navigation.