Study On The Convergence Of Dielectric Loading In Antenna Pattern

With the development of mobile communication technology, the base station antenna is facing the situation of GSM?CDMA?GPRS?TDMA?TD-LTE?FDD-LTE. In order to improve the radiation intensity and power of antenna, it is necessary to ensure the stability of antenna beam width convergence. Media loading is a technique that can be applied to the antenna pattern convergence. The dielectric loading technique is also used in microwave circuits. It is widely used in modern communications such as resonators, filters, dielectric waveguides and other microwave components to improve the gain, enhance convergence Effect of the key technologies.Based on the theory of dielectric loading technique, the gain and half-power beamwidth of 1.7GHz-2.7GHz single-band patch antenna,0.69GHz-0.96GHz and 1.7GHz-2.7GHz dual-band parallel antenna are studied. By optimizing the medium loading lens The distance between the source and the source, the simulation and optimization tests are carried out with the electromagnetic simulation software ANSYS HFSS, and a new dielectric lens loading technique is proposed, which is applied to the convergence of the antenna pattern. The main contents of this paper are as follows:1. Based on the 1.7GHz-2.7GHz single-band patch antenna, using loading Glass, Polyethene, RogersR03006 different types of materials, by optimizing the structure of the lens loaded lens shape, distance from the radiation source and radius of curvature and other parameters, The power beam width is converged from 107 ° -137 ° to 98 ° ± 2 °, which greatly increases the convergence of the half-power beam width. The optimized combination of antenna structure and loading medium achieves the arbitrary half-power beam width Of the regulation. The ideal antenna and Fresnel lens were chosen for physical processing and testing, and the conclusion was reached that the half - power beam width could be converged by the medium loading technique.2. Based on the designed 0.69GHz-0.96GHz, 1.7GHz-2.7GHz parallel dual-frequency antenna, the antenna size structure is optimized to meet the radiation reflection coefficient of antenna. The half-power beamwidth optimization method and theory of single-band antenna are adopted. The radius of curvature of the lens and the distance from the radiation source are optimized. A lens structure is designed to meet the requirement of the half-power beam width of the cellular base station antenna of 60 °. The effect of loading lens on the half-power beamwidth convergence of the antenna is analyzed and the physical processing and testing of the dual-frequency antenna and the ordinary convex lens are carried out. It is verified that the medium loading technique can realize the convergence of the multi-frequency point to the fixed degree in the radiated frequency band.3. Based on the electromagnetic simulation software ANSYS HFSS,a calculation method of Cauchy's dispersion coefficient is presented. The Cauchy's dispersion formula expresses the refractive index of the loaded medium to different frequency points, which is the material of the single-Parameter optimization to provide theoretical support.4. Based on Snell's law, geometric relations and optics principle,Matlab programming program to design a hyperboloid medium loaded lens structure optimization method, greatly reducing the single-frequency antenna dielectric lens structure parameter optimization design time.