# Open Circuited Transmission Line

When the transmission line is opened from the load end, it is known as open circuited transmission line.

As shown in the diagram, at the open circuited end the current is minimum and voltage is maximum. At each λ/2 interval this behavior is repeated if we move away from the load end towards the source.

As shown in the diagram, that at λ/4 from the opened end the behavior of the voltage and current is vice versa to the short circuited transmission line. It means that at λ/4 from the opened end the voltage is minimum and current is maximum. This behavior is also repeated at λ/2 interval from the same point, or at the odd multiples of λ/4 on the transmission line.

As the current at the opened circuit end be maximum. At λ/4 away from the opened circuit point the impedance will be minimum because the current is maximum possible.

## Characteristics

There are the following characteristics of open circuited transmission line.

1. The voltage standing wave ratio of the open circuited transmission line is infinity.
2. The magnitude of voltage reflection co-efficient is one.
3. The phase angle of voltage reflection co-efficient for the open circuited transmission line is in phase.
4. The first node of maximum voltage is at λ/2.
5. The first voltage maximum node is at λ/2 away from the open end point.
6. The current is minimum and voltage is maximum at λ/4 distance from the open circuited point.
7. The current is minimum and voltage is maximum at the open circuited point.