By Yi Huang, Kevin Boyle
Functional, concise and entire reference for the fundamentals of contemporary antenna layout Antennas: from concept to perform discusses the fundamentals of contemporary antenna layout and thought. built in particular for engineers and architects who paintings with radio communications, radar and RF engineering, this ebook bargains sensible and hands-on remedy of antenna concept and methods, and gives its readers the talents to examine, layout and degree quite a few antennas. Key positive factors: * offers thorough insurance at the fundamentals of transmission traces, radio waves and propagation, and antenna research and layout* Discusses business regular 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 varied antennas are supplied* Written in a realistic and concise demeanour through authors who're specialists in antenna layout, with adventure from either academia and This ebook could be a useful source for engineers and architects operating in RF engineering, radar and radio communications, looking a accomplished and functional advent to the fundamentals of antenna layout. The publication is usually used as a textbook for complicated scholars coming into a career during this box.
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Additional info for Antennas: From Theory to Practice
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. All other features remain the same as in the lossless case. 80 Resistance. 3: Quarter-wavelength transform. A 75 resistor is to be matched with a transmission line of characteristic impedance 50 .
20). 36) It is hard to predict how the loss tangent changes with the frequency, since both the permittivity and conductivity are functions of frequency as well. More discussion will be given in Chapter 3. 14. Using these equations, we can obtain a number of useful results. 14. This condition means that the tangential components of an electric field (nˆ × E) are continuous across the boundary between any two media. 39) where Js is the surface current density and ρ s is the surface charge density.
However, it still exhibits a period feature if we neglect the amplitude changes. All other features remain the same as in the lossless case. 80 Resistance. 3: Quarter-wavelength transform. A 75 resistor is to be matched with a transmission line of characteristic impedance 50 . If a quarter-wavelength transformer is employed, what should its characteristic impedance be? 2 ( ) Since this is not a standard characteristic impedance of a transmission line, special dimensions and/or materials will be needed to construct this line.
Antennas: From Theory to Practice by Yi Huang, Kevin Boyle