By Fan Yang
This finished, applications-oriented survey of the state-of-the artwork in Electromagnetic Band hole (EBG) engineering explains the speculation, research, and layout of EBG constructions. It permits you to comprehend EBG purposes in antenna engineering via an abundance of novel antenna suggestions, a wealth of useful examples, and entire layout information. you find a personalised FDTD approach to EBG research, for which actual and effective electromagnetic software program is provided (www.cambridge.org/9780521889919) to supply you with a robust computational engine on your EBG designs. the 1st ebook protecting EBG constructions and their antenna functions, this offers a dynamic source for engineers, and researchers and graduate scholars operating in antennas, electromagnetics and microwaves.
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Additional resources for Electromagnetic Band Gap Structures in Antenna Engineering (The Cambridge RF and Microwave Engineering Series)
For example, if we set kx to 600 radian/m in Fig. 19 GHz, respectively. Since the FDTD method is a time domain method that covers a wideband frequency in a single simulation, it is preferable to use the latter statement as a goal to analyze waveguide problems. 39) is directly used in the simulation process. After the time domain simulation arrives at a steady state, the Fourier transform is performed and the eigen-frequencies can be identiﬁed from the spikes in the frequency spectrum. 5 0 0 200 400 600 Wavenumber (radian/m) 800 1000 Fig.
Assume an electromagnetic wave propagates along the x direction in a periodic waveguide. At a given frequency ω, the propagation constants kx (or β) of guided waves need to be identiﬁed. The results are usually plotted in the kx -frequency plane, and are known as the dispersion curves. For example, Fig. 7 shows the dispersion curves of a dielectric slab waveguide. There are four curves in this ﬁgure and each represents a speciﬁc surface wave mode. At the frequency 25 GHz, the corresponding propagation constants are 539 radian/m, 575 radian/m, 736 radian/m, and 771 radian/m, respectively.
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. The reﬂection coefﬁcient plotted in the kx -frequency plane provides a complete and clear picture on the scattering property for all incident angles and all frequencies. Rationale of the constant kx method It is instructive to review the previous periodic boundary conditions on the kx -frequency plane. For a normal incident case, we have θ = 0 and kx = 0.