|
| |
| |
 |
Open
Circuit Transmission Line |
 |
|
|
|
An open circuited transmission line reflects all forward-propagating
waves completely, with G=1. This makes
for a beautiful example of constructive and destructive interference. |
|
|
|
Open Circuit Voltages |
|
 |
|
|
|
Notes: |
- Notice how the total voltage doubles up at the load end of the
line. This is a peak of constructive interference. If we
were graphing current instead of voltage, the forward-propagating and
backward-propagating current waveforms would completely and
destructively interfere at the end of the line -- no current can flow
through an open circuit.
|
- The standing wave interference pattern has the highest possible
voltage peaks and the lowest possible voltage nulls (at 0 V). On
this 4l-line, how many places could you
place a voltmeter and not measure any voltage drop from the top
line to the bottom?
|
- Notice that VSWR goes to infinity for this voltage envelope.
What does this mean physically?
|
|
|
