Download Anwendung von RFID-Systemen, 1.Auflage by Christian Kern PDF

By Christian Kern

Die Radio-Frequenz-Identifikation (RFID) dient seit etwa 15 Jahren zur Identifikation von Personen, Objekten und Tieren. Mit der inzwischen intestine entwickelten Technologie k?nnen heute Rationalisierungen in vielen Wirtschaftsbereichen erreicht werden. Das Buch bietet eine Darstellung bestehender Anwendungen und Technologiegrundlagen sowie eine Beschreibung der M?glichkeiten und Grenzen von RFID. Es soll dem Projektleiter zugleich als Leitfaden f?r die Auswahl geeigneter RFID-Systeme dienen. Eine Abgrenzung von Funktionseinheiten ist in einer Systembetrachtung enthalten. Der Leser wird in die Lage gebracht, eine RFID-Anwendung von der Idee bis zur Praxis aufzubauen und die richtigen Ressourcen zusammenzustellen. Im Anhang aufgef?hrt sind: Firmen, die im Bereich RFID t?tig sind, eine ?bersicht zu bestehenden Anwendungen in verschiedenen Branchen sowie Gremien und Institute, die sich mit RFID besch?ftigen und kompetente Beratung geben k?nnen.

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When a wave is reflected the resulting wave consists of a superposition of the incident and the reflected wave; such waves are called standing waves. The coefficient of reflection is called Γ. A definition of the mismatch is the voltage standing wave ratio (VSWR); which is bounded by the reflection coefficient –1 ≤ Γ ≤ 1. e. no reflection. 3 Wave Impedance The wave impedance (ZW) is defined as the ratio of the electric field amplitude (E) to the magnetic field amplitude (H). ZW = E [Ω] H The characteristic impedance (ZC) of a medium is a function of the constitutive parameters of the medium and the frequency of the electromagnetic wave.

This makes the radiated signal level from the antenna inside the shield test device dependent on the material in test, which is an unwanted property of the system. Unwanted signal paths: In the beginning signal flowed directly from the signal generator to the spectrum analyser through the air. Then the signal generator was moved further apart from the signal cables connecting the receiving antenna to the amplifiers the effect disappeared. 5 Analysis If one tested shield material has lower radiation mean than another tested shield material it is easy to determine which one to use if not: The material with the lowest mean has its maximum radiation in a direction greater than the maximum radiation of the other material with a higher overall mean.

Electromagnetic Theory and Fundamentals of EMC”, In Perez, Reinaldo, editor, Handbook of Electromagnetic Compatibility, Academic Press, 1995 Tsaliovich, Anatoly, Electromagnetic shielding handbook for wired and wireless EMC applications, Kluwer Academic Publishers, 1999 Wilson, P. , Ma, M. , “Factors influencing shielding effectiveness measurements”, International Symposium on Electromagnetic Compatibility, IEEE, New York, NY, USA, 1985, 629 p. pp. 1 Skin Effect The skin effect is a frequency-dependent material property.

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