lecture 2

# lecture 2 - RF Circuit Design EE 4002-2 Spring 2004 Lecture...

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RF Circuit Design EE 4002-2 Spring 2004 Lecture 2 RF Behavior of Passive Components John Scalzo

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Review of low freq. behavior 2 DC l R a π σ = σ l 2a DC l R A = General Resistance of a conductor Resistance of a cylindrical conductor is the material conductivity measured in S/m or (Ωm)^-1 silver = 6.17 x 10^7 copper = 6.45 x 10^7 gold = 4.85 x 10^7 aluminum = 4.0 x 10^7 Resistance: Current density in the conductor is uniform for DC current flow.
Reactance: Capacitance and Inductance have frequency dependent reactances 1 ( ) C X C ϖ - = L X L = Impedance of C and L vs. frequency

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Current density in a conductor is NOT uniform as signal frequency increases. Recall Faraday’s law: Alternating charge carrier flow establishes a magnetic field that induces an electric field. The induced current density opposes the initial current flow, strongest at the center of the conductor. Phenomena is called the
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## This note was uploaded on 01/31/2012 for the course EE 4002 taught by Professor Scalzo during the Fall '06 term at LSU.

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lecture 2 - RF Circuit Design EE 4002-2 Spring 2004 Lecture...

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