Design Of Metamaterials-based Ground Penetrating Radar Antenna

Microstrip antenna, as a kind of new antenna type, with its many advantages set off a new Research hot spot in antenna field in recent years. Although apply its to the ground penetrating radar (GPR) system, have being a good solve of the traditional GPR antenna which become low practicality because of its too large volume and expensive manufacturing. But there is still an influence on the performance of ground penetrating radar (GPR) because the gain of microstrip antenna is not high or its bandwidth is not enough.In recent years electromagnetic metamaterial as an designability artificial material, because of its unique electromagnetic properties, such as:Electric field, magnetic field and the wave vector submit to left hand rule, poynting vector and wave vector parallel to the reverse、Reversed Snell Refraction、Reversed Doppler Effect and Reversed Cerenkov Radiation. All of this provide an new improvement direction for us in GPR antenna design, therefore grope for the performance of electromagnetic metamaterials load on the GPR antenna has the vital significance for the engineering application of ground penetrating radar (GPR).This paper surrounding the application of electromagnetic metamaterials load on new GPR antenna have such following research aspects:The first is the theory study of patch antenna and electromagnetic metamaterials. Including: the working principle of the patch antenna, the physical mechanism to reach negative permittivity and negative permeability, and the inversion method of material is constitutive parameters by using equivalent medium theory;Second section under the basic theory, we implementation the antenna and the material which design and simulation on software CST patch and work around1GHZ, By adjusting the antenna parameters to change the equivalent capacitance and inductance of antenna, Design an work frequency in the0.5GHZ to1.2GHZ ultra-wideband antenna, on the basis of the antenna working frequency we designed the corresponding negative permittivity material, negative permeability material and some double negative materials. Through the S parameter inversion of design material and the analysis of surface current in the corresponding frequency, we verify the characteristics of material with equivalent negative constitutive parameters;Finally we will combine the antenna and material we design, Through observation of the original antenna radiation and field polarization direction to choose the appropriate distance to load metamaterial on antenna be able to coupled with each other,through compare the performance parameter of loading the single negative material on antenna、common metal reflection plate and the original antenna, proves that the single negative materials we design make a significant role in improving antenna gain and direction.In the result of loading double negative material on the original antenna,the gain and its orientation have no big change majorly because of the defect of original antenna, but through observe the radiation pattern we proved the effect when the double negative material load on antenna improving the gain and directivity.The mainly innovation of this article is: design an ultra-wideband antenna which work frequency from0.5GHZ to1.2GHZ, the single negative material and double negative materials which working frequency around1GHZ, proves the big improvement of performance when using metamaterials on antenna.