Subwavelength Patch-Antennas Loaded with Metamaterials: A Simple Realisation of the Material and Improved Polarization

摘要

To get compact antenna with high performance, the resonant frequency of rectangular cavity loaded with metamaterial is analyzed. It is indicated that the cavity can resonant at frequency as low as we desired by choosing proper parameters. According to the conclusion, a metamaterial based patch antenna is designed, the impedance and radiation characteristics of which are analyzed. Split ring resonators(SRRs) integered with capacities are used to realize mu-negative material. A proper alignment of SSR is chosen, based on the near field orientation. Dimension of this antenna is very small compared to resonant wavelength (about 10 %). Maximum gain, which can be achieved is 3.8 dBi and its cross polarization discrimination is high to 35 dB. The results show that this may indeed open interesting venues for the design of electric small antenna.