The Investigation And Design Of Microstrip Patch Antenna Based On The Metamaterial

The development of modern electronic warfare has set higher demands for the stealth performanceof radar on the weapons platform. The antenna, as a strong scatter source, affects the stealthperformance of the whole platform. The patch antenna is widely used on the weapons platform, so ithas a very important military values to study the RCS reduction technology of the antenna. Thenovel electromagnetic metamaterial provide a new solution for designing novel antenna andenhancing the radiation and scattering performance of antenna. Based on the technology ofmetamaterial in this paper, the methods to reduce the RCS of antennas are studied, and someproducts are obtained as follows:1. Based on the theory of antenna scattering, the relationship between antenna’s scattering modesand working band is analyzed deeply, from which we get and validate the main contributors to totalscattering fields that should be reduced under different circumstances, which provides the theoreticbasis for antenna’s RCS reduction.2. The broad bandwidth, high-gain and low RCS patch antenna (array) is studied based on thecomplementary split-ring resonators (CSRRs) and Complementary Triangular ElectromagneticResonator (CTER). Using the metamaterial concept via the periodically loaded metamaterial unitcell on the upper patch and strip-line gaps on the bottom ground plane, respectively, two novelpatch antennas are designed. Compared with the original antenna, the CSRR antenna has a muchlower resonant center frequency obviously reduced about36.4%, a wider bandwidth significantlybroadened from about2.9%to about39.9%; the relative bandwidth of the CTER antenna isbroadened from2.9%to64.5%. Simultaneously, due to the left-handed characteristics ofmetamaterial, the two antennas have the strongest radiation in horizontal direction instead of thevertical direction of the conventional patch antenna. The gains of the two antennas are kept withinthe bandwidth. Both antennas have the lower RCS reduced above5dB within the whole operationbandwidth. The antenna arrays consisted respectively of the two antennas also have the betterradiation performance and low RCS. Experimental data show a reasonably good agreement with thesimulation results. The two antennas have the higher project application value.