Electromagnetic Band Gap Structures in Antenna Engineering by Fan Yang
By Fan Yang
This complete, applications-oriented survey of the state-of-the artwork in Electromagnetic Band hole (EBG) engineering explains the speculation, research, and layout of EBG buildings. It lets you comprehend EBG functions in antenna engineering via an abundance of novel antenna recommendations, a wealth of useful examples, and entire layout info. you find a personalized FDTD approach to EBG research, for which actual and effective electromagnetic software program is equipped (www.cambridge.org/9780521889919) to supply you with a strong computational engine on your EBG designs. the 1st ebook masking EBG buildings and their antenna functions, this gives a dynamic source for engineers, and researchers and graduate scholars operating in antennas, electromagnetics and microwaves.
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Sample text
448 GHz in Fig. 142 GHz in Fig. 9b for TE mode. When the number of FDTD simulation steps increases, these spikes become more dominant in the frequency spectrum. The reason is that at later time, only eigen-modes exist in the computation domain whereas all other frequency components vanish. Thus, a discrete frequency spectrum can be obtained eventually. The spikes in the frequency spectrum represent the corresponding frequencies of the eigen-modes. 142 GHz are the eigen-frequencies of the guided wave when the propagation constant kx is 300 radian/m.
For our discussion on the scattering analysis, only the reflection coefficient in the plane wave region needs to be considered. The normal incidence and an oblique incidence are also indicated by the dashed lines in this kx -frequency plane. It is observed that the total transmission, represented by dark scales, occurs in two zones. The first one starts at 10 GHz when kx equals to zero (normal incidence). The frequency increases to 12 GHz as the horizontal wavenumber increases. The second zone is around a tilted line in the kx -frequency plane, which corresponds to an incident angle of 58◦ , the Brewster angle for this case.
35) Periodic boundary conditions For an infinite structure, it is impossible to directly simulate it using limited computation resources. Thus, the computation domain needs to be truncated using proper boundary conditions. The perfectly matched layers (PML) discussed in the previous section are used to absorb radiating energy from antennas or scatterers that have finite sizes. In many applications, especially in artificial electromagnetic materials, an EM structure itself extends to infinity in a periodic manner.