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Download Antennas. From theory to practice by Yi Huang PDF

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 concept. built in particular for engineers and architects who paintings with radio communications, radar and RF engineering, this ebook deals sensible 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 features:

  • Provides thorough assurance at the fundamentals of transmission traces, radio waves and propagation, and antenna research and design
  • Discusses business 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 assorted antennas are provided
  • Written in a realistic and concise demeanour via 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 complete and sensible advent to the fundamentals of antenna layout. The publication can be used as a textbook for complicated scholars coming into a career during this box

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Example text

Towards the source), this can be shown on the Smith Chart as the impedance point is moved on the | | (or VSWR) circle clockwise. When the reference point is moved towards the load, it means that the impedance point is moved on the | | circle anti-clockwise. The distance is normalized to the wavelength. The Smith Chart can also be shown in other forms, such as normalized admittance, which is often known as the Y Smith Chart. In this book we are mainly interested in using the impedance Smith Chart.

21) which is not a function of the frequency and is only determined by the transmission line itself–no dispersion. This is an important feature required for all transmission lines. 2 Low-Loss Transmission Lines In practice, most transmission lines cannot be considered lossless structures but, instead, are low-loss transmission lines. The definition of ‘low loss’ is R ωL , G ωC This seems to imply extremely high frequency. The reality is that both R and G are functions of frequency. Normally, the higher the frequency, the larger R and G.

Step 2: Move from point B1 to the center O. This can be achieved easily using a stub connected in parallel with the line, thus it is advantageous to work in admittances. 8318. This can be achieved by the following two designs: A. 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.

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