CompTIA RFID+ certification by Mark Brown, Sam Patadia, Sanjiv Dua, Visit Amazon's Michael

By Mark Brown, Sam Patadia, Sanjiv Dua, Visit Amazon's Michael Meyers Page, search results, Learn about Author Central, Michael Meyers,

From the number 1 identify in expert Certification

Get at the quick song to changing into CompTIA RFID+ qualified with this reasonable, transportable learn instrument. within, RFID specialists advisor you in your profession direction, offering specialist advice and sound suggestion alongside the best way. With a thorough specialise in basically what you want to understand to cross the CompTIA RFID+ examination, this certification passport is your price tag to luck on examination day.

Featuring:

  • Itineraries--List of reliable examination targets coated
  • ETAs--Amount of time had to whole every one lesson
  • Travel Advisories--Expert suggestion on severe issues
  • Local Lingo--Concise definitions of keyword phrases and ideas
  • Travel Assistance--Recommended assets for additional info
  • Exam Tips--Common examination pitfalls and strategies
  • Checkpoints--End-of-chapter questions, solutions, and causes
  • Career Flight Path--Career concepts mapped out to maximise the go back out of your IT trip
  • Practice examination on CD

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Additional resources for CompTIA RFID+ certification

Example text

Cold spot Cold spot refers to spaces within the antenna beam where power density is lower than normal. Hot and cold spots make the antenna radiation pattern look like Swiss cheese. CHAPTER 2 The RF in RFID 25 As radio waves travel, they interact with objects and the media they encounter. This interaction causes reflection, refraction, diffraction, scattering, and absorption of the wave. This interaction also can change the waves’ direction of travel or it can block the waves. The change in direction causes the waves to reach areas that would not be possible if the radio signals traveled in a direct line.

Because of CHAPTER 2 The RF in RFID 33 this, the electromagnetic field may be treated as a simple magnetic alternating field with regard to the distance between tag and antenna. Since the operating wavelength is very much greater than the distance between the tag and interrogator, the coupling elements are not really antennas in the true sense, because no real power is being radiated. Power transfer to and from the tag is by coupling of reactive near-field energy in the immediate vicinity of the antenna structure.

This has advantages, because the signals can reach an area that is not in direct LOS, and it also has disadvantages, because the reflections of the signal or other signals in the vicinity can interfere with the original signal. Exam Tip Know that multipath causes variations in power density within an antenna beam. Reflection Radio waves, like light waves, are reflected by many surfaces. Reflection occurs when a propagating electromagnetic wave impinges upon an object that has very large dimensions compared to the wavelength of the propagating wave.

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