The Analysis And Design Of Smart Antennas Using FDTD

Because of the attractive features of low profile, light weight, easy fabrication, and conformability to mounting hosts, this paper chooses microstrip antenna to design the smart antennas. The microstrip antenna is modeled and simulated by the FDTD (Finite Difference Time Domain).FDTD method and the principle of microstrip antenna are introduced. Some methods to reduce the dimension and improve the bandwidth are provided.Based on one dimensional transmission line method and FDTD, according to theoritical calculation and simulated modification, a rectangle patch antenna working at 1.79GHz is designed. Using nonuniform Finite-Difference Time-Domain(FDTD) algorithm to model and simulate this antenna, this paper presents analysis of frequency specialty, far field radiation patterns .impedance specialty and Voltage Standing Wave Ratio(VSWR).Based on this antenna, linear microstrip antenna array and 2×2 planar microstrip antenna array of 4 elements is designed, the far field radiation patterns of arrays is calculated and discussed in this paper. Linear microstrip antenna array with 7 elements is designed and simulated, the mutual coupling among microstrip antenna array elements is discussed in this paper.How to design and simulate an array antenna by given radiation pattern is discussed, an example is given for this method. The optimized synthetic design method is described in this paper for the shaping of radiation pattern of array antenna using FDTD. Calculating procedure is shown in this paper for the synthetic design of radiation pattern of N element linear antennas, in turn , the solutions for the 7 and 8 elements linear antenna are provided with the results using FDTD.Design and analysis of phased array microstrip antennas based on FDTD is introduced. The model is constructed and simulated by using FDTD. Linear arrays consisting of 7 and 8 elements phased microstrip patch cells is designed by this method, and some parameters such as radiation pattern are analyzed after optimizing. The solutions for 7 and 8 array antenna are provided and compared with the results using FDTD. The analysis results shows that the method is useful for rapid designing and analyzing phased array microstrip antennas, and the phase scanning is accurate, the technology of manufacture is commonplace, the application to popularize is valuable for the marketplace.