Download e-book for kindle: Antenna analysis and design using FEKO electromagnetic by Atef Z. Elsherbeni

By Atef Z. Elsherbeni

The target of this publication is to introduce scholars and design-engineers to antenna layout and research utilizing the preferred advertisement electromagnetic software program FEKO. This booklet is basically meant for college students operating within the box of antenna research and layout; but the wealth of hands-on layout examples offered during this book―along with simulation details―also makes it a important reference for training engineers. The requirement for the readers of this booklet is to be conversant in the fundamentals of antenna concept; although electric engineering scholars taking an introductory direction in antenna engineering may also take advantage of this ebook as a supplementary textual content.

The key strengths of this publication are as follows
* First, the fundamentals of antenna simulation can be provided in a close, comprehensible, and easy-to-follow process via learn of the easiest different types of radiators, i.e. dipole and loop antennas, in chapters 2 and three. it will construct the elemental wisdom a pupil would want with the intention to make the most of antenna simulation software program normally.
* moment, comparability among theoretical research and full-wave simulation result of FEKO are given for quite a few antenna kinds, that allows you to relief the readers with a greater figuring out of the speculation, approximations and boundaries within the theoretical research, and answer accuracy.
* 3rd, and of paramount significance, is the visualization of the antenna present distribution, radiation styles, and different radiation features which are made to be had via full-wave simulations utilizing FEKO. a formal research of the radiation features via those visualizations serves as a robust academic instrument to completely comprehend the radiation habit of antennas.

The advertisement electromagnetic software program FEKO is chosen for the simulations because of its a number of benefits and recognition. specifically, this software program presents a number of solvers that may be selected for a quick and effective research counting on the kind of antenna. additionally, FEKO presents loose school room licenses to universities which can be utilized to simulate many of the antenna configurations awarded during this book.

FEKO simulation documents can be found to teachers who undertake the e-book for his or her path or execs who've bought the booklet. Please touch The IET for additional information

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Sample text

Note that while the –3 dB gain bandwidth is much larger (about 55 MHz), for a wireless power transfer the major concern is the return loss bandwidth of the transmitter and receiver. To study wireless power transfer, we consider two dipole elements, placed at a distance (d) from each other. Both are aligned parallel to the z direction, so theoretically no polarization mismatch will be observed here. The geometry of this simulation in CADFEKO is given in Figure 2-22. The power received by the receiver antenna is given in Figure 2-23 for two cases, d ¼ l and d ¼ 5l.

3 15 Indeed, a triangular current distribution can be observed for small wire dipole elements. In addition, for shorter dipoles the magnitude of the current is also smaller and decreases almost monotonously with the dipole length. As the frequency changes, the triangular distribution of the current is still maintained, but the magnitude increases (decreases) as the frequency increases (decreases), since the electrical length increases (decreases). 77 dB. An almost stable radiation pattern is observed for both designs.

4 280 (c) FIGURE 2-12 (d) l. 2 270 330 (d) 280 290 300 310 Frequency [MHz] 320 330 Gain as a function of frequency for finite length dipole antennas: (a) l/4. (b) l/2. (c) 3l/4. The antenna gain as a function of frequency is given in Figure 2-12. The antenna gain increases with frequency, which is due to the larger electrical size of the dipole. In addition, while all designs show an increase in gain as a function of frequency, this variation in gain increases for larger dipoles. For the case of l ¼ l, the change in antenna gain is about 1 dB across this 20% band.

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