Abstract: The cross-chairs-shaped resonator(CCSR), a new structure of the planar waveguide periodically loaded with a novel resonant structure, is presented. Theoretical analysis, numerical calculation and simulation results show and verify the properties of 2D left-handed materials (2D LHM) in two frequency bands. Compared with the conventional 2D LHM consisting of orthogonal arrays of wires and split ring resonators, this 2D LHM has some novel properties: double-band-pass, no medium loss, higher power capacity and so on because of the cross-chairs-shaped resonator’s all-metallic structure and special resonant ways. Meanwhile, the CCSR unit cell loading planar waveguide is a new type of planar waveguide dual-bandpass filter with perfect bandpass characteristic and small size.