Microwaves

Antennas. From theory to practice by Yi Huang

By Yi Huang

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

Antennas: from thought to Practice discusses the fundamentals of recent antenna layout and idea. built in particular for engineers and architects who paintings with radio communications, radar and RF engineering, this e-book deals functional and hands-on therapy of antenna conception and strategies, and gives its readers the talents to examine, layout and degree a number of antennas.

Key features:

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

This ebook might be a useful source for engineers and architects operating in RF engineering, radar and radio communications, looking a accomplished and useful advent to the fundamentals of antenna layout. The publication is additionally used as a textbook for complex scholars coming into a occupation during this box

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5. It is worth noting the following special cases for a lossless transmission line: r Matched case: Z L = Z 0 (l) = 0 = 0 – the reflection is zero at any point of the line (even for a non-perfect transmission line). L RT = ∞ dB – in practice, this means that the return loss is huge, say 50 dB. 37 Circuit Concepts and Transmission Lines r Open circuit: Z L = ∞ − j2βl – the amplitude of the reflection coefficient is 1 at any point of the 0 = 1 and (l) = e line. L RT = 0 dB – this means that all power is reflected back from the load.

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.

After 360 degrees (half wavelength), it is back to A. e. −20 and +20 . 1. 2 Impedance Matching Impedance matching is the practice of making the output impedance of a source equal to the input impedance of the load in order to maximize the power transfer and minimize reflections from the load. Mathematically, it means the load impedance being the complex conjugate of the source impedance. 44) Normally, we can use either lumped networks or distributed networks to match impedance. 1 Lumped Matching Networks Lumped matching networks can be divided into three basic types: the L network, the T network and the pi (π) network.

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