Download Antennas: From Theory to Practice by Yi Huang, Kevin Boyle PDF

By Yi Huang, Kevin Boyle

Sensible, concise and whole reference for the fundamentals of contemporary antenna layout Antennas: from idea to perform discusses the fundamentals of recent antenna layout and thought. constructed particularly for engineers and architects who paintings with radio communications, radar and RF engineering, this publication bargains functional and hands-on remedy of antenna thought and methods, and offers its readers the abilities to examine, layout and degree quite a few antennas. Key gains: * presents thorough insurance at the fundamentals of transmission traces, radio waves and propagation, and antenna research and layout* Discusses business general layout software program instruments, and antenna size gear, amenities and methods* Covers electrically small antennas, cellular antennas, UWB antennas and new fabrics for antennas* additionally discusses reconfigurable antennas, RFID antennas, Wide-band and multi-band antennas, radar antennas, and MIMO antennas* layout examples of assorted antennas are supplied* Written in a realistic and concise demeanour by means of authors who're specialists in antenna layout, with event from either academia and This publication can be a useful source for engineers and architects operating in RF engineering, radar and radio communications, looking a entire and sensible advent to the fundamentals of antenna layout. The booklet can be used as a textbook for complex scholars coming into a occupation during this box.

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Extra resources for Antennas: From Theory to Practice

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24), Qv can actually be viewed as the current vector I and the product of μH is called the magnetic flux density B (in Tesla), the counterpart of the electric flux density. 26) Again, in an isotropic material (properties independent of direction), B and H are in the same direction and μ is a scalar quantity. In an anisotropic material, B and E may be in different directions and μ is a tensor. 4. Permeability is not sensitive to frequency or temperature. Most materials, including conductors, have a relative permeability very close to one.

Provided that the frequencies are sufficiently close, the resulting Smith Chart points may be joined by straight lines to create a locus. A locus of points on a Smith Chart covering a range of frequencies can be employed to visually represent: r how capacitive or inductive a load is across the frequency range; r how difficult matching is likely to be at various frequencies; r how well matched a particular component is. The accuracy of the Smith Chart is reduced for problems involving a large spread of impedances, although the scaling can be magnified for individual areas to accommodate these.

A 75 resistor is now connected to a good transmission line with characteristic impedance of 50 . 2 Np/m at 1 GHz. Plot the input impedance as a function of the line length (up to 2λ). 5. Solution: For a low-loss transmission line, the characteristic impedance is still a constant (= 50 in this case). The line length changes from 0 to 2λ. 49 m. 2 + j2π/λ. 7. It can be seen that the only change is that the input impedance is no longer a periodic function of the line length. However, it still exhibits a period feature if we neglect the amplitude changes.

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