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

By Yi Huang, Kevin Boyle

Useful, concise and entire reference for the fundamentals of contemporary antenna layout Antennas: from idea to perform discusses the fundamentals of contemporary antenna layout and conception. constructed in particular for engineers and architects who paintings with radio communications, radar and RF engineering, this ebook deals functional and hands-on remedy of antenna thought and strategies, and offers its readers the talents to examine, layout and degree quite a few antennas. Key beneficial properties: * offers thorough assurance 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 pragmatic and concise demeanour by way of authors who're specialists in antenna layout, with event from either academia and This booklet could be a useful source for engineers and architects operating in RF engineering, radar and radio communications, looking a entire and useful creation to the fundamentals of antenna layout. The booklet is usually used as a textbook for complicated scholars coming into a occupation during this box.

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The short- and opencircuit stub tuning is very similar to the lumped matching circuit tuning: reactance and/or admittance is added to the matching network. The example below is a good illustration of how to realize matching using a distributed network. 9: Impedance matching and bandwidth. A load with an impedance of 10 − j100 is to be matched with a 50 transmission line. Design two distributed matching networks and compare them in terms of the bandwidth performance. 17, this corresponds to a unique point A on the Smith Chart.

The period is half of a wavelength. r The input impedance is a complex number even when the load impedance is a pure resistance. The resistance changes between 75 and 33 , whilst the reactance changes between −20 and +20 . r There are two resonant points (where the reactance is zero) over one period. 25 in this case. e. capacitive. e. inductive. 2: Input impedance of a low-loss transmission line. A 75 resistor is now connected to a good transmission line with characteristic impedance of 50 . 2 Np/m at 1 GHz.

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. 42) This can be used to calculate the reflection coefficient once the VSWR is known. 9 zmax Standing waves of the voltage and current on a transmission line 40 Antennas: From Theory to Practice Thus, the VSWR of a line is bounded by unity and infinity: 1 ≤ VSWR ≤ ∞ For most applications, the VSWR is required to be smaller than 2, which is considered a good match.

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