Antennas. From theory to practice by Yi Huang

By Yi Huang

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

Antennas: from idea to Practice discusses the fundamentals of contemporary antenna layout and idea. built particularly for engineers and architects who paintings with radio communications, radar and RF engineering, this e-book deals functional and hands-on therapy of antenna thought and methods, and offers its readers the abilities to examine, layout and degree a variety of antennas.

Key features:

  • Provides thorough insurance at the fundamentals of transmission strains, radio waves and propagation, and antenna research and design
  • Discusses commercial average layout software program instruments, and antenna size 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 realistic and concise demeanour by means of authors who're specialists in antenna layout, with adventure from either academia and industry

This e-book may 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 e-book is additionally used as a textbook for complex scholars getting into a occupation during this box

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19). This extra term is the time derivative of the electric field and is known as Maxwell’s displacement current. Maxwell’s modified version of Ampere’s Circuital Law enables the set of equations to be combined together to derive the electromagnetic wave equation, which will be further discussed in Chapter 3. Now let us have a closer look at these mathematical equations to see what they really mean in terms of the physical explanations. 30) This equation simply means that the induced electromotive force is proportional to the rate of change of the magnetic flux through a coil.

If there is no reflection at the end of the transmission line, it means that the boundary conditions have forced A2 to be zero, thus the reverse wave will be zero and only the forward-traveling voltage will exist on the transmission line in this case. Similarly, the line current can also be viewed as the combination of two traveling current waves. It is worth noting that the reverse-traveling current has a minus sign with the amplitude, this means a phase change of 180 degrees and reflects the direction change in the returned current.

It is a function of the frequency and parameters of the line. The industrial standard transmission line normally has a characteristic impedance of 50 or 75 when the loss can be neglected (R ≈ 0 and G ≈ 0). 13) where α is called the attenuation constant (in Nepers/meter, or Np/m) and β is called the phase √ constant. Because γ = (R + jωL)(G + jωC), we can find that mathematically: α= 1 2 1 β= 2 1/2 (R 2 + ω2 L 2 )(G 2 + ω2 C 2 ) + (RG − ω2 LC) 1/2 (R 2 + ω2 L 2 )(G 2 + ω2 C 2 ) − (RG − ω LC) 2 They are functions of frequency as well as the parameters of the transmission line.

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