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Transcript
Displacement of
a string with
one end fixed
Phasor representation.
You should know how to
convert to time domain.
(There was a
homework
problem)
For simplicity,
assume Y0+ is
positive and real.
sin
Quiz:
What property of
a mirror makes it
a mirror?
What's the current? Convert voltage and current phasors to time domain.
In practice, not easy to make
an open circuit.
Again, find the current. Convert both voltage and current phasors to time domian.
Quiz:
What's the spatial period
of the standing wave?
-
Pay attention to the max, min, and this value.
Note: If you plot the amplitudes
(instead of the squares thereof),
the curves are not sinusoidal.
constructive interference
destructive interference
Fig. 2-16, pp. 74 in 7/E
complex
Quiz:
Zin = ?
Z0
Z0
The period of |VSC| is λ/2.
Here, the period is λ
1
(6/E)
(pp. 81, 7/E)
With a short, you can make an open!
Notice the frequency
dependence.
zL =
ZL
Z0
Normalized
What's the equivalent normalized form?
See next pages for optical analog:
Anti-reflective coating
Same principle as the optical anti-reflective coating
Anti-Reflection coating
Fields of all rays sum to zero
......
Air
A-R coating
Glass lens
(Adapted from: Naveed Ramzan,
http://www.slideshare.net/nramzan19/smith-chart-lecture)