By Atef Z. Elsherbeni
The target of this e-book is to introduce scholars and design-engineers to antenna layout and research utilizing the preferred advertisement electromagnetic software program FEKO. This publication is basically meant for college students operating within the box of antenna research and layout; but the wealth of hands-on layout examples provided during this book―along with simulation details―also makes it a priceless reference for practising engineers. The requirement for the readers of this ebook is to be conversant in the fundamentals of antenna thought; although electric engineering scholars taking an introductory direction in antenna engineering may also take advantage of this booklet as a supplementary textual content.
The key strengths of this ebook are as follows
* First, the fundamentals of antenna simulation might be offered in an in depth, comprehensible, and easy-to-follow method via examine of the best kinds of radiators, i.e. dipole and loop antennas, in chapters 2 and three. this can construct the elemental wisdom a scholar would wish with a purpose to make the most of antenna simulation software program as a rule.
* moment, comparability among theoretical research and full-wave simulation result of FEKO are given for quite a few antenna varieties, so that it will reduction the readers with a greater realizing of the speculation, approximations and obstacles within the theoretical research, and resolution accuracy.
* 3rd, and of paramount value, is the visualization of the antenna present distribution, radiation styles, and different radiation features which are made on hand via full-wave simulations utilizing FEKO. a formal research of the radiation features via those visualizations serves as a strong academic software to completely comprehend the radiation habit of antennas.
The advertisement electromagnetic software program FEKO is chosen for the simulations because of its a variety of benefits and recognition. particularly, this software program presents a number of solvers that may be selected for a quick and effective research reckoning on the kind of antenna. in addition, FEKO offers loose lecture room licenses to universities which can be utilized to simulate lots of the antenna configurations offered during this book.
FEKO simulation documents can be found to teachers who undertake the booklet for his or her path or pros who've bought the publication. Please touch The IET for additional information
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The target of this ebook is to introduce scholars and design-engineers to antenna layout and research utilizing the preferred advertisement electromagnetic software program FEKO. This publication 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 working towards engineers.
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Extra resources for Antenna analysis and design using FEKO electromagnetic simulation software
We consider four dipoles with lengths l/4, l/2, 3l/4, and l. 0001l. It should be noted here that the maximum scale in both these figures is 10 dB. The current distribution on the dipoles at the center frequency and at the frequency extremes across a 20% band is given in Figure 2-9. As the dipole length increases, the triangular current distribution changes into a sinusoidal distribution, where an almost half-cycle is observed for the halfwavelength dipole. To emphasize here the necessity of full-wave simulations for an accurate analysis, the normalized current distribution for half-wavelength and one-wavelength dipoles obtained using the full-wave simulation are compared with the analytical current distribution.
Note the difference in computational time for these two cases. The radiation pattern of the dipole antenna will be distorted. The radiation pattern of the antenna is shown in Figure 2-33. It is also interesting to compare the gain values of the dipole antennas when they are placed close to these obstacles. In the configurations studied in these sections, the maximum dipole gain is obtained with the horizontal dipole when it is placed above an infinite PEC ground. 6 dB. 5 dB, and the sphere configuration had the lowest gain, which was about 3 dB.
Z Y X Z (a) Y X Z Y X Z (b) X 27 Y Compared with the dipole in free space (Figure 2-11), a significant difference is now observed in the pattern shape. While a null is still seen in the broadside direction, several other nulls seem to appear along other elevation angles. The presence of these nulls is attributed to the existence of the image source here . Note that if the vertical distance of the dipole to the ground plane changes, the position of these nulls will change; however, the broadside null will always be present in this case.