DEVELOPMENT ELECTRICALLY SMALL ANTENNAS WITH USE METAMATERIAL
An electrically small strip-type antenna was developed at a frequency of 300 MHz. As the coordinating element the thin layer of metamaterial allowing to improve significantly efficiency of radiation of the antenna with geometrical sizes significantly smaller wavelengths is used.The basis of the coating is a silicone with a low absorption in the microwave range with inclusions from metal П-shaped resonators. The way of production of metamaterial and a covering is presented to them in article antennas. For the description of electromagnetic characteristics of such environment the mathematical model of the concentrated oscillatory contour is presented. Numerical modeling of the antenna by method of final differences in a time domain (FDTD) is carried out and the optimum thickness of a covering of 4.1 mm providing maximum efficiency of radiation is calculated. For confirmation of numerical results the directional pattern, the small antenna created electrically covered with metamaterial has been investigated. It is experimentally established that the power of radiation of the antenna covered with a metamaterial layer increases several times in comparison with the antenna without such covering. It is experimentally established that the antenna covering metamaterial leads to narrowing of the directional pattern and noticeable increase in amplitude of a signal.