By Yi Huang

ISBN-10: 0470510285

ISBN-13: 9780470510285

**Practical, concise and entire reference for the fundamentals of contemporary antenna design**

*Antennas: from idea to Practice* discusses the fundamentals of contemporary antenna layout and concept. constructed particularly for engineers and architects who paintings with radio communications, radar and RF engineering, this booklet bargains sensible and hands-on therapy of antenna thought and methods, and gives its readers the talents to examine, layout and degree numerous antennas.

*Key features:*

- Provides thorough insurance at the fundamentals of transmission strains, radio waves and propagation, and antenna research and design
- Discusses commercial general layout software program instruments, and antenna dimension gear, amenities and techniques
- Covers electrically small antennas, cellular antennas, UWB antennas and new fabrics for antennas
- Also discusses reconfigurable antennas, RFID antennas, Wide-band and multi-band antennas, radar antennas, and MIMO antennas
- Design examples of varied antennas are provided
- Written in a pragmatic and concise demeanour by way of authors who're specialists in antenna layout, with event from either academia and industry

This publication should be a useful source for engineers and architects operating in RF engineering, radar and radio communications, looking a finished and useful advent to the fundamentals of antenna layout. The booklet is usually used as a textbook for complex scholars getting into a career during this box

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**Extra resources for Antennas. From theory to practice**

**Example text**

5. 30) since the distance should not be negative and we have used l = −z and tanh(−γ l) = − tanh(γ l). 33) This is a very useful equation. Special attention should be paid to the following cases: r Matched case: Z L = Z 0 Z in (l) = Z 0 , the input impedance is the same as the characteristic impedance and is not a function of the length of the line. 34) The input impedance has no resistance, just reactance (capacitive for small l). r Short circuit: Z L = 0 Z in (l) = j Z 0 tan(βl) Again, the input impedance has no resistance, just reactance (inductive for small l).

B. e. 19 dB The return loss is slightly increased, as expected. 8. e. 47l dB. 9. 41) Obviously, the VSWR is just another measure of how well a transmission line is matched with its load. Unlike the reflection coefficient, the VSWR is a scalar and has no phase information. For a nonperfect transmission line, the VSWR is a function of the length of the line (l) as well as the load impedance and the characteristic impedance of the line. But for a lossless transmission line, the VSWR is the same at any reference point of the line.

B. e. 98 d B for l = 0 and λ/4, and actually any length of such a transmission line. 5: Reflection coefficient and return loss of a low-loss transmission line. 2 Np/m at 1 GHz. a. What is the voltage reflection coefficient for l = 0 and λ/4, respectively? b. Plot the return loss as a function of the line length. 5. 2 Np/m. 5 a. 1952 Z L + Z0 This means that not only the phase of the reflection coefficient but also the amplitude is changed when the length of the transmission line is increased by a quarter-wavelength.

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