Lec27DirCoup - ECE 488 RF Circuits and Systems Spring 2009...

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1 ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 09/3/30 Lecture 27: 1 Directional Couplers ECE 488 RF Circuits and Systems Spring 2009 Lecture 27 2009/4/3 ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 09/3/30 Lecture 27: 2 Take directional couplers. Announcements ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 09/3/30 Lecture 27: 3 There are two solutions to the wave equation for transmission lines Signals can propagate in both directions, simultaneously Signals can reflect from unmatched loads Reflections usually mean BIG Problems How can we detect reflections? Simple probes measure TOTAL voltage, but How can weasure Forward and Reflected waves, separately? Directional Couplers – Motivation ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 09/3/30 Lecture 27: 4 Fraction of Incident Forward Fraction of Reflected Reverse Directional Couplers – Diagram Incident Power Reflected Power Antenna Transmitter Forward Reverse Antenna Transmitter ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 09/3/30 Lecture 27: 5 Directional Couplers – Uses Make sure the power is going where it is supposed to be going.
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Lec27DirCoup - ECE 488 RF Circuits and Systems Spring 2009...

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