Transmission Lines

Question 1

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

Answer 1

Transmission Lines

Question 2

made up of two parallel conductors spaced from one another.

Answer 2

Balanced Transmission Line/ Differential Transmission Line

Question 3

consists of a solid conductor conductor surrounded by an insulator.

Answer 3

Unbalanced Transmission Lines/ Single-Ended/ Concentric Transmission Lines

Question 4

currents that flow in opposite direction

Answer 4

metallic circuit currents

Question 5

currents that flow in the same direction

Answer 5

longitudinal circuit currents

Question 6

device that is used to connect a balanced transmission line to an unbalanced load

Answer 6

Balun

Question 7

most common type of balun

Answer 7

narrowband balun, choke, sleeve or bazooka

Question 8

EM interference between two conductors that occurs when current flows through one conductor, it produces a magnetic field that can interfere with the adjacent conductor

Answer 8

crosstalk

Question 9

balanced transmission line with spacers between the two conductors that are continuous solid dielectric that ensures uniform spacing along the entire cable

Answer 9

twin lead/ribbon cable

Question 10

balanced transmission line that is formed by twisting two insulated conductors around each other to reduce effects of EM or RF interference

Answer 10

twisted pair

Question 11

twisted pair that consists of two copper wires where each wire is separately encapsulated in PVC insulation.

Answer 11

unshielded twisted pair

Question 12

twisted pair that consists of two copper conductors separated by a solid dielectric material, and its wires and dielectric are enclosed in a conductive metal sleeve known as the foil

Answer 12

shielded twisted pair

Question 13

consists of center conductor surrounded by a dielectric material, then a concentric shielding, and finally a rubber environmental protection outer jacket. It is also commonly used in high frequency applications.

Answer 13

coaxial cable

Question 14

coaxial cable connector that can be easily twisted on or off

Answer 14

BNC Connector/bayonet mount

Question 15

coaxial cable connector that is threaded and must be screwed on and off

Answer 15

N-type Connector

Question 16

refers to the woven stranded mesh that surrounds some types of coaxial cables

Answer 16

shielding

Question 17

Series Inductance of a Parallel Conductor Transmission Line

Answer 17

Question 18

Series Inductance of a Coaxial Cable Transmission Line

Answer 18

Question 19

Series Conductance of a Parallel Conductor Transmission Line

Answer 19

Question 20

Series Conductance of a Coaxial Cable Transmission Line

Answer 20

Question 21

permittivity of free space

Answer 21

Question 22

permeability of free space

Answer 22

Question 23

impedance seen looking into an infinite long line or impedance seen looking into a finite length of a line that is terminated in a purely resistive load with resistance equal to the characteristic impedance.

Answer 23

Characteristic Impedance/ Surge/Inherent/Intrinsic/Transmission Impedance

Question 24

Characteristic Impedance Formula

Answer 24

Question 25

Characteristic Impedance for Radio Frequencies/ High Frequencies

Answer 25

Question 26

Characteristic Impedance for Audio Frequencies/ Low Frequencies

Answer 26

Question 27

Characteristic Impedance Formula for Parallel Conductor Transmission Lines

Answer 27

Question 28

Characteristic Impedance Formula for Coaxial Cable Transmission Lines

Answer 28

Question 29

Propagation Constant Formula

Answer 29

Question 30

used to express the attenuation (signal loss) and the phase shift per unit length of the transmission line.

Answer 30

Propagation Constant/Coefficient

Question 31

Attenuation Coefficient Formula

Answer 31

Question 32

Phase Shift Coefficient Formula

Answer 32

Question 33

Velocity of Propagation Formulas

Answer 33

Question 34

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

Answer 34

velocity factor

Question 35

the relative permittivity of a material, and it depends on the type of insulating material used.

Answer 35

dielectric constant

Question 36

The velocity factor of a coaxial cable ranges from

Answer 36

0.6 - 0.8

Question 37

transmission lines designed to intentionally introduce time delay in the path of EM waves. The amount of time delay is a function of the transmission line’s inductance and capacitance

Answer 37

delay lines

Question 38

Electrical Length Formula

Answer 38

Question 39

phenomenon wherein the signals tend to propagate at outer edge of the cable if the frequency of operation is too high.

Answer 39

Skin Effect

Question 40

transmission line wherein there is no reflected power in the transmission line.

Answer 40

Non-Resonant Transmission Line/Flat Line/ Matched Line

Question 41

transmission line where the load impedance is not equal to the characteristic impedance of the line, some of the incidence power is reflected back to the load.

Answer 41

Resonant Transmission Line/ Mismatched Line

Question 42

Represents the ratio of the reflected voltage to the incident voltage or reflected current to the incident current

Answer 42

Reflection Coefficient

Question 43

Reflection Coefficient Formulas

Answer 43

Question 44

Ratio of maximum voltage or current to the minimum voltage or current of a standing wave in a transmission line

Answer 44

Standing Wave Ratio

Question 45

It is a measure of mismatch between the load impedance and the characteristic impedance of a transmission line.

Answer 45

Standing Wave Ratio

Question 46

SWR Formulas

Answer 46

Question 47

an interference pattern setup by two traveling waves

Answer 47

Standing Wave

Question 48

Power Absorbed by the Load Formulas

Answer 48

Question 49

Return Loss Formula

Answer 49

Question 50

Mismatch Loss Formula

Answer 50

Question 51

Transmission Line Input Impedance Formula

Answer 51

Question 52

section of a transmission line that is used to match a transmission line to a purely resistive load

Answer 52

quarter wave transformer

Question 53

short length of the transmission line connected either series or parallel used for impedance matching . It is used to match a complex or reactive load.

Answer 53

Stub

Question 54

used to measure the power being delivered to a load or an antenna through a transmission line

Answer 54

Directional Coupler

Question 55

It is used to measure standing waves

Answer 55

reflectometer

Question 56

short section of air-dielectric coaxial line that permits convenient and accurate measurement of standing waves

Answer 56

Slotted Line

Question 57

It is the graphical calculator used for transmission line matching.

Answer 57

Smith Chart, created and developed by Phillip Smith

Question 58

It is a flat conductor separated from a ground plane by insulating dielectric material. It is more likely to radiate which creates more loss.

Answer 58

Microstrip

Question 59

It is a flat conductor sandwiched between two ground planes. It is less likely to radiate which creates less loss.

Answer 59

Stripline