Lect1 -A Journey Into Radio & IC History

Lect1 -A Journey Into Radio & IC History - ECE 620...

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ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture 1 1
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Outline Heterodyne Receivers The Role of Vacuum Tubes The Invention of the Transistor 2
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3 The Early Beginnings Unified theory for electric and magnetic fields Light is an electromagnetic wave Discovery in steps: The difference between E and H vectors “On Faraday's Lines of Force, 1855 Discovery of displacement current “On Physical Lines of Force”, 1861 Maxwell equations, wave properties of light: “A Dynamical Theory of the Electromagnetic Field” , 1864 James Clerk Maxwell Scotland (1831-1879)
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4 The 1 st Transmitter 1 st experimental proof that electromagnetic waves exists Light is a form of electromagnetic radiation 1 st broadcast and receive of radio waves Wireless telegraph and radio 1888, 1 st transmitter, receiver and antenna Spark gap transmitter and detector Heinrich Hertz Germany (1857-1894)
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5 A Better Detector?
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Branly,1892: Invention of the radio conductor (a.k.a. coherer)
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This note was uploaded on 11/21/2011 for the course ECE 620 taught by Professor Khalil during the Fall '11 term at Ohio State.

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Lect1 -A Journey Into Radio & IC History - ECE 620...

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