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lecture4 - Transmission media Cees Keyer Contents Cables...

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Transmission media Cees Keyer
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Contents Cables Coaxial cables Micro strip Fibre optics
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Introduction The signals we produce for transmitting information, needs a medium to be transmitted. In this case free space is also considered a medium. So we need a metallic conductor or a fibre to transmit respectively electrons or fotons. But what are the important parameters of such a medium? How do we describe a conductor? What is meant by characteristic impedance.
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Transmission media Cables Twisted pair Shielded twisted pair Wave media Coaxial cable Wave guide Fiber optics Micro strip Strip line Free space
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Cables Twisted pair
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Wave media
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Wave media 2 Stripline and microstrip Found on Printed circuit boards only.
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The mathematical model Goals: Thinking about cables What the f*ck is cable impedance What is characteristic impedance
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Per length units. A cable of two conductors Capacitance per meter Inductance per meter Resistance per meter Conductance per meter. We need to differentiate for this. Functions of more variables f x = 2x 2 3x 4 f x , y = 3y 2 2x 2 3x 6y 4
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Differentiation f x = 2x 2 3x 4 f ' x = 4x 3 f ' x = df x dx f x , y = 3y 2 2x 2 3x 6y 4 f ' x , y = f x , y x f ' y , x = f x , y y If you differentiate with respect to x Y is considered to be constant ∂ 3y 2 2x 2 3x 6y 4 x = 4x 3 3y 2 2x 2 3x 6y 4 y = ????
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Cable model. x
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The transmission equations. Consider the cable from the previous sheet: Cable is exited with a generator with internal impedance Z 0 Terminated with an impedance z 2 on length L How to find the voltage on x? If we take in to account that the currents in both conductors are equal (absolutely seen) but opposite in direction.
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lecture4 - Transmission media Cees Keyer Contents Cables...

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