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

By Dr. Yi Huang, Kevin Boyle

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

Antennas: from concept to perform discusses the fundamentals of contemporary antenna layout and conception. built in particular for engineers and architects who paintings with radio communications, radar and RF engineering, this ebook bargains sensible and hands-on therapy of antenna conception and strategies, and gives its readers the talents to examine, layout and degree quite a few antennas.

Key positive factors:

  • Provides thorough insurance at the fundamentals of transmission traces, radio waves and propagation, and antenna research and layout
  • Discusses commercial normal layout software program instruments, and antenna size apparatus, amenities and strategies
  • 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 supplied
  • Written in a realistic and concise demeanour via authors who're specialists in antenna layout, with adventure from either academia and undefined

This e-book can be a useful source for engineers and architects operating in RF engineering, radar and radio communications, looking a accomplished and useful creation to the fundamentals of antenna layout. The ebook is usually used as a textbook for complex scholars coming into a career during this box.

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Additional info for Antennas: From Theory to Practice

Example text

This is why the characteristic impedance of industrial standard transmissions has a constant value, normally 50 or 75 ohms, over a large frequency band, even when the line loss is not zero. 23) The loss (attenuation) is caused by the resistive loss R and the material loss G between the conductors. The phase constant is again the same as for lossless lines. 23). e. v= ω 1 =√ β LC There is no dispersion (it is not changed with frequency). 3 Terminated Transmission Line It is now clear that the voltage and current of a transmission line are distributed quantities; they are functions of the position z.

2, if we divide the transmission line into many (almost infinite) short segments of length z, which is much smaller than the wavelength of interest, each segment can then be represented using a set of lumped elements. By doing so, a distributed transmission line is modeled as an infinite series of two-port lumped elementary components, each representing an infinitesimally short segment of the transmission line. 3, where R = R1 + R2 and L = L 1 + L 2 . r The resistance R represents the conductive loss of the transmission line over a unit length, thus the unit is ohms/unit length ( /m).

The same unit, the Ohm ( ), is used for impedance, resistance and reactance. The inverses of the impedance, resistance and reactance are called the admittance (Y ), conductance (G) and susceptance (B), respectively. Their unit is the Siemens (S) and it is 1 Ohm. r Power P is defined as the amount of work done by an electrical current, or the rate at which electrical energy is transmitted/consumed. The SI unit of power is the Watt (W). When an electric current flows through a device with resistance, the device converts the power into various forms, such as light (light bulbs), heat (electric cooker), motion (electric razor), sound (loudspeaker) or radiation for an antenna.

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