Study Of Fabry-Perot Resonant High-Gain Antennas

Recently, Fabry-Perot resonator antennas have found wide application in wireless communication due to the advantages such as simple structure, low profile, low cost, easy fabrication, and more important the high directivity.The research and application in antenna area of metamaterial are more and more concerned. Especially, various metamaterials as antenna superstrate are practically useful to enhance the directivity of antennas, which has a great deal of application in the future. In this thesis, the theory of F-P resonator antenna is further studied. Based on the F-P theory, the mechanism of directivity enhancement using different metamaterials structures as antenna superstrates is unifiedly analyzed. Besides, several low-profile, dual-band and wide-band high directivity F-P resonator antennas are designed. Furthermore, F-P resonator antenna arrays are studied.The main works and contributions in this thesis are outlined as follows:(1) Based on the current theory of F-P resonator antenna, the theory is renewed. According to the theory, the research of three kinds of antennas such as electromagnetic band-gap (EBG), frequency selective surfaces (FSS) and left-handed metamaterials (LHM) as antenna superstrates are given, and the uniform mechanism of directivity enhancement using different metamaterial structures as antenna superstrates are verified to satisfy the F-P resonant theory.(2) Based on the theory of F-P resonator, some kinds of low-profile high-gain F-P resonator antennas are designed with a novel kind of fishnet superstrate. Using a fishnet structure as the superstrate and a mushroom-like EBG structure as the ground plane, a novel F-P resonator antenna is proposed to realize the ultra low-profile and high-gain properties as well as low-backlobe. Compared to the traditional patch antenna with the distance of λ/2between the original antenna surface and superstrate, the distance of the three novel antennas are less than λ/10and one of them can achieve zero distance finally.(3) Two double-layered cross-dipole and fishnet superstrates are designed to enhance antenna’s directivity for dual-band characteristics, respectively. The two kinds of designed F-P resonator antennas can achieve directivity enhancements in two different frequency bands. Furthermore, an improved double-layered fishnet superstrate can make the antenna obtain high directivity for a broad frequency band. Finally, the wide-band F-P resonator antenna is achieved. (4) Based on the theory of F-P resonator, high directivity antenna arrays with superstate are studied. First, the F-P resonator antenna arrays with a traditional height (λ/2) are designed. And then a low-profile (λ/14) F-P resonant antenna array is proposed and realized by using fishnet superstrate. The simulation results show that the F-P resonant antenna array has also the properties of low-profile and high-directivity. Finally, the effects of the superstrate on the beam-scanning degree and directivity of the F-P resonator antenna arrays are studied.