Review 4 ( Transmission Lines)

Front 1

Transmission Lines

Back 1

Is a metallic conductor system used to transfer electrical energy from one point to another using electrical current flow.

Front 2

Guided

Back 2

Are those with some form of conductor that provides a conduit in which electromagnetic energy are contained.

Front 3

Unguided

Back 3

Are wireless systems.

Front 4

Longitudinal

Back 4

The displacement is in the direction of propagation.

Front 5

Transverse

Back 5

The direction of displacement is perpendicular to the direction of propagation.

Front 6

Balanced Transmission Lines

Back 6

1 wire - Signal

2 wire - return path

Front 7

Unbalanced Transmission Lines

Back 7

1 wire - Ground Potential

2 wire - Signal Potential

Front 8

Baluns

Back 8

A circuit device used to connect a balanced transmission line to an unbalanced transmission load.

Front 9

Parallel Conductor Transmission Lines

Back 9

An example of balanced lines.

Front 10

Coaxial Transmission Lines

Back 10

An example of unbalanced lines.

Front 11

Characteristic Impedance, Surge

Back 11

It is the impedance seen looking into the infinitely long line. It is sometimes called _______ impedance.

Front 12

Velocity Factor

Back 12

Ratio of the actual velocity of propagation on an EM wave through a given medium to the velocity of propagation in free space.

Front 13

Conductor Loss

Back 13

Directly proportional to the square of the line of the length.

Front 14

Dielectric Heating Loss

Back 14

Difference of potential between conductors in a metallic transmission line.

Front 15

Radiation Loss

Back 15

The transmission line may act as an antenna and transfer energy to the nearby conductive material.

Front 16

Incident Voltage

Back 16

Voltage that propagates from the source toward the load.

Front 17

Reflected Voltage

Back 17

Voltage that propagates from the load to the source.

Front 18

Flat or Nonresonant line

Back 18

A transmission line with no reflected power

Front 19

Resonant transmission line

Back 19

When the load is not equal to the characteristic impedance of the line, some of the incident power is reflected back to the load.

Front 20

Reflection Coefficient

Back 20

Represents the ratio of the reflected voltage to the incident voltage or the currents..

Front 21

Standing Waves

Back 21

An interference pattern set up by two traveling waves.

Front 22

Standing Wave Ratio (SWR)

Back 22

Defined as the ratio of the maximum voltage or current to the minimum voltage or current of a standing wave.

Front 23

Quarter-wavelength Transformer

Back 23

These are used to match transmission lines to purely resistive loads whose resistance is not equal to the characteristic impedance of the line.

Front 24

Stub

Back 24

A piece of additional transmission line that is placed across the primary line as close to the load as possible.