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lecture 2

# lecture 2 - RF Circuit Design Lecture 2 RF Behavior of...

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RF Circuit Design Lecture 2 RF Behavior of Passive Components

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Review of low freq. behavior Resistance: Resistance of a cylindrical conductor 2 DC l R a π σ = General Resistance of a conductor l DC l R A = 2a Current density in the conductor is uniform for DC current flow. is the material conductivity measured in S/m or ( m)^-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
Reactance: Capacitance and Inductance have frequency dependent reactances L X L ω = 1 () C XC = Impedance of C and L vs. frequency

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High Frequency Behavior 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 skin effect. Schematic cross-sectional AC current density normalized to DC current density
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lecture 2 - RF Circuit Design Lecture 2 RF Behavior of...

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