Monopole antenna with top load

A new style of monopole antenna is put forward, along with the design idea and structure model. The antenna fed by a coaxial line is top-loaded with a U-type load. Simulation and experiments have been conducted. The simulated results show that this antenna can radiate axial microwaves, it’s Gain is 8.33dBi, the axial ratio is －69.64 dB, the reflectance is 0.034, in the range of 3.83 GHz to 4.50 GHz , the reflectance is below 0.10. The experimental results show that it’s gain is 8.116 dBi, the VSWR is 1.098 at 4.0G Hz, in the range of 3.75 GHz to 4.50 GHz , the VSWR is below 1.2, the results of experiment consistent with the simulated results, validated each other．