Download e-book for kindle: Antennas. From theory to practice by Yi Huang

By Yi Huang

ISBN-10: 0470510285

ISBN-13: 9780470510285

Practical, concise and whole reference for the fundamentals of recent antenna design

Antennas: from conception to Practice 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 booklet bargains useful and hands-on remedy of antenna thought and methods, and offers its readers the talents to examine, layout and degree numerous antennas.

Key features:

  • Provides thorough assurance at the fundamentals of transmission traces, radio waves and propagation, and antenna research and design
  • Discusses business commonplace layout software program instruments, and antenna dimension apparatus, 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 means of authors who're specialists in antenna layout, with event from either academia and industry

This e-book might be a useful source for engineers and architects operating in RF engineering, radar and radio communications, looking a complete and functional advent to the fundamentals of antenna layout. The booklet is additionally used as a textbook for complex scholars getting into a occupation during this box

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Sample text

0325λ; B. 2825λ. The stub length can also be obtained from the Smith Chart. Now let us examine the bandwidth of these two designs. 475 cm for Design B. We can use the input impedance formula: Z in (l) = Z 0 Z L + j Z 0 tan(βl) Z 0 + j Z L tan(βl) and the following two equations: = VSWR = Z L − Z0 Z L + Z0 1+| | 1−| | to obtain the VSWR as a function of the frequency. 19. It is apparent that r both designs have an excellent impedance match at the center frequency 1 GHz; r the stub length of Design A is shorter than that of Design B whilst the bandwidth of Design A is much wider than that of Design B.

5 1 Line length in wavelength 2 Input impedance as a function of the transmission line length for Z L = 75 and Z0 = 50 35 Circuit Concepts and Transmission Lines r The input impedance is a periodic function of the line length. 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.

11 What are the material properties of interest to our electromagnetic and antenna engineers? 12 What is the Lorentz force? Name an application of the Lorentz force in our daily life. 13 If a magnetic field on a perfect conducting surface z = 0 is H = 10 cos(10t − 5z)x, ˆ find the surface current density Js. 14 Use Maxwell’s equations to explain the major differences between static EM fields and time-varying EM fields. 15 Express the boundary conditions for the electric and magnetic fields on the surface of a perfect conductor.

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Antennas. From theory to practice by Yi Huang

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