Die Physikalischen Grundlagen Der Hochfrequenztechnik

Name: Die Physikalischen Grundlagen Der Hochfrequenztechnik
Brand: Springer
SKU: 9783642946561
Price: 3432.0 INR
Availability: InStock

by Hans Georg Möller , N. Von Korshenewsky , W. T. Runge

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ISBN13: 9783642946561
Binding: Paperback
Subject: N/A
Publisher: Springer
Publisher Imprint: Springer
Publication Date: January 21, 2013
Pages: 262
Original Price: EUR 46.72
Language: German
Edition: Softcover Repri
Item Weight: 450 grams
BISAC Subject(s): Engineering (General)

About The Book

1. Warum müssen wir für die drahtloseTelegraphie elektromagnetische Wellen verwenden? Für die drahtlose Telegraphie müssen wir uns elektrischer und magnetischer Felder bedienen, die von Ladungen oder Strömen ausgehen, die wir am Sende- ort herstellen, und die bis zum fernen Empfangsort laufen. Statische Felder 3 nehmen mit der Entfernung r wie 1/r ab. Das gilt sowohl für elektrische wie auch für magnetische Dipole. Die übertragene Leistungsdichte (fö berechnet sich nach POYNTING zu = [Q: . -9]. 6 Sie nimmt bei Benutzung statischer Felder wie 1/r mit der Entfernung ab. Die von H. HERTZ entdeckten elektromagnetischen Wellen sind ihrer Natur nach Lichtwellen. Sie unterscheiden sich von letzteren nur durch die grö ere Wellenlange. Die übertragene Leistung nimmt, wie wir aus der Photometrie 2 wissen, mit 1/r ab. Um die Überlegenheit der Hertzschen Wellen zu zeigen, wollen wir 2 Stationen vergleichen, die in 1 km Entfernung die gleiche Leistung haben und von denen die eine mit statischen Feldern, die andere mit Wellen arbeitet. In 10 km Entfernung ist die Leistung der Wellenstation auf 1/100, die der "sta- tionären" auf 1/1000000 abgesunken. Die Wellen sind den stationären Feldern um das 10 000 fache überlegen. 2. Warum müssen wir hochfrequente Wechselfelder verwenden? Wir werden in dem Kapitel über die Abstrahlung elektrischer Wellen von einer Antenne die Formel kennenlernen: Hierbei bedeutet: Cf = Feldstärke am Empfangsort Ä = Wellenlänge r = Entfernung heff = effektive Antennenhohe: J = Stromstärke am Fu punkt der Antenne.

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