Based on the analysis of the configuration and the character of the circularly polarized antenna with tilted beam

a novel CSRR-FS(Complementary Split Ring Resonator with Flower-Spiral

CSRR-FS)structure is proposed to increase the bandwidth of the antenna.This structure is designed through the flower-spiral arm and five complementary split ring resonator(CSRR)splits loaded on ground plane.The VSWR(voltage standing wave ratio)is enhanced through the flower-spiral structure.And respectively

five CSRR splits are loaded on the perfect electronic conductor ground plane to miniaturize the ground plane and decrease the cross-polarization component.The axial ratio is improved through the ground plane loaded five CSRR splits.Simulated and measured results both show that the relative bandwidth of the novel antenna with the CSRR-FS structure is 24% from 5.5GHz to 7GHz in the condition of circularly polarized radiation.And while

it is an azimuth angle of 30 tilted beam by the CSRR-FS structure.The bandwidth increases 1.8 times as wide as one without the CSRR-FS structure in the same condition.The proposed structure is an effectively method for increasing the bandwidth of circularly polarized antenna with tilted beam.