| Recently, with the coming of the information era, wireless communications are widely used which gives a higher request to the performance of antennas. Fabry-Perot cavity resonator antennas which based on the metamaterial superstrate have been drawn more and more attention, because of their outstanding features, such as high gain, narrow beam, ease of manufacture and simple feed system. Furthermore, it can significantly improve the microstrip antenna low gain and wide beam. This thesis is mainly concerned with the research of high gain and high directive Fabry-Perot resonant cavity antennas which worked on 2.45 GHz. The thesis mainly researches on:A conventional microstrip patch antenna which worked on 2.45 GHz is designed. The results which simulated on the software HFSS show that the return loss at 2.45 GHz center frequency is-11.4 dB, the gain is about 6.6 dB and the main width of E, H lobe surface is about 82, 75. The results show that the conventional microstrip patch antenna has a low gain and wide beam.A Fabry-Perot resonant cavity antenna is designed consists of metamaterial superstrate and 2.45 GHz microstrip patch antenna. The metamaterial superstrate which composed of square lattices as a partially reflecting surface and the microstrip patch antenna as a primary radiator. The simulation results show that the absolute value of 11 S with metamaterial superstrate can reach 37.4 dB which increased about 26 dB when compared with the conventional microstrip patch antenna, the gain of the antenna is 11 dB and the main width of E, H lobe surface are all about 25. So the gain and directivity of the metamaterial patch antenna are significantly improved. Then we have fabricated and measured it, the results show that the absolute value of 11 S has a gain of 24 dB at the working frequency of 2.45 GHz and good radiation characteristics. The measured results are closed to the simulation results, it turned out that the designed antenna in aspect of gain and directivity achieves our goal. |
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