Tri-band antenna based on CSRR and LHTL

The invention discloses a tri-band antenna based on CSRR and LHTL, which belongs to the technical field of multi-frequency antennas based on a metamaterial structure. The problem of universally narrow impedance bandwidth of the existing multi-frequency antenna is solved. The antenna is in an axial symmetry structure by taking the center line of a dielectric plate of the axis. A complementary split ring resonator CSRR, a left hand transmission line LHTL, a coplanar waveguide CPW, two triangle impedance matching units and two virtual floors cover the upper surface of the dielectric plate. The complementary split ring resonator CSRR structure realizes first two work bands of the antenna, and the antenna works in a dipole antenna mode. The left hand transmission line LHTL realizes a third additional work band. The coplanar waveguide CPW is connected with the complementary split ring resonator CSRR. Two triangle impedance matching units are respectively inserted into a space between the left side of the coplanar waveguide CPW and the complementary split ring resonator CSRR and a space between the right side of the coplanar waveguide CPW and the complementary split ring resonator CSRR. The tri-band antenna is applied to indoor communications.