Die Physikalischen Grundlagen Der Hochfrequenztechnik

Name: Die Physikalischen Grundlagen Der Hochfrequenztechnik
Brand: Springer
SKU: 9783662240021
Price: 3776.0 INR
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by Hans Georg Möller , Nicolai Von Korshenewsky , Wilhelm T. Runge

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ISBN13: 9783662240021
Binding: Paperback
Subject: N/A
Publisher: Springer
Publisher Imprint: Springer
Publication Date: January 1, 1955
Pages: 261
Original Price: EUR 51.39
Language: German
Edition: 3. Aufl. 1955.
Item Weight: 395 grams
BISAC Subject(s): Microwaves

About The Book

1. Warum müssen wir für die drahtlose Telegraphie 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 1jr ab. Das gilt sowohl für elektrische wie auch für magnetische Dipole. Die übertragene Leistungsdichte 0 berechnet sich nach POYNTING zu 6 Sie nimmt bei Benutzung statischer Felder wie 1jr 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 Wellenlänge. Die übertragene Leistung nimmt, wie wir aus der Photometrie 2 wissen, mit 1jr ab. Um die Überlegenheit der Hertzsehen 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 1j1oo, die der "sta- tionären" auf 1j1oooooo abgesunken. Die Wellen sind den stationären Feldern um das wooofache überlegen. 2. Warum müssen wir hochfrequente Wechselfelder verwenden? Wir werden in dem Kapitel über die Abstrahlung elektrischer Wellen von einer Antenne die Formel kennenlernen: Q; = 120 n Q:: J;.h;u. Hierbei bedeutet: Q: =Feldstärke am Empfangsort Ä = Wellenlänge r = Entfernung hefi = effektive Antennenhöhe:3 = Stromstärke am Fu punkt der Antenne.

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