Introduction

Question 1

RF engineering

Answer 1

designing systems and components to relay information and/or power from one location to another via electromagnetic waves as efficiently as possible

Question 2

Electromagnetic wave

Answer 2

a disturbance that transmits energy from one location in space to another

Question 3

Solution to fundamental wave equation

Answer 3

forward-travelling wave and reverse-travelling wave

Question 4

Gradient

Answer 4

returns a vector that has the rate and direction of maximum ascent. ( ∇A)

Question 5

Divergence

Answer 5

How much a vector spreads out from a point (∇ ⋅ A)

Question 6

Solenoidal

Answer 6

When the divergence is 0, the field is solenoidal and always forms closed loops

Question 7

Curl

Answer 7

returns a vector telling us how much the field circulates about a point, with the direction dictated by the RHR. (∇ x A)

Question 8

Faraday’s Law

Answer 8

E-fields circulate around points of time-varying magnetic field.

Question 9

Gauss’ Law

Answer 9

Electric flux density spreads out from point of non-zero free charge density. (∇ ⋅ D) = ρ

Question 10

Ampere’s Law with Maxwell’s addition

Answer 10

Magnetic field intensity (H) circulates around points of non-zero conduction current density (J) and displacement current density (dD/dt)

Question 11

The speed of an EM wave in a medium

Answer 11

is equal to the speed of light in that medium

Question 12

A vector with a curl of zero is

Answer 12

irrotational/conservative

Question 13

Equation for the D-field

Answer 13

D = ε0E+P, where P is the polarization vector

Question 14

Permeability

Answer 14

μ,the ability of the material to form an internal magnetic field within itself under the influence of an applied magnetic field

Question 15

Permittivity

Answer 15

a measure of the electric polarizability of a dielectric

Question 16

Conductivity

Answer 16

Electrical conductivity (or specific conductance) is the reciprocal of electrical resistivity. It represents a material’s ability to conduct electric current

Question 17

Equation for the B-field

Answer 17

(1/μ0)H-M, where M is the magnetization vector

Question 18

B-fields are always

Answer 18

solenoidal

Question 19

Linear Medium

Answer 19

Medium properties are independent of the intensity of the applied fields

Question 20

Isotropic Medium

Answer 20

Medium properties are independent of the orientation of the applied fields

Question 21

Homogeneous Medium

Answer 21

Medium properties are independent of spatial variables (x,y,z)

Question 22

Curl of the gradient is

Answer 22

always zero

Question 23

Divergence of the curl is

Answer 23

always zero

Question 24

Magnetic Potential Vector

Answer 24

B = ∇ x A

Question 25

Magnetic Potential Vector with Faraday’s Law

Answer 25

∇ x (E + dA/dt) = 0 (always). This is used to define the electric scalar potential

Question 26

Electric Scalar Potential

Answer 26

E + dA/dt = -∇V

Question 27

Assumptions made for linear, isotropic and homogenous mediums

Answer 27

Allows us to simplify maxwells equations and express in terms of E and H(orB)

Question 28

Time Harmonic Excitation assumptions

Answer 28

excitation is periodic, allows for phasor/Fourier analysis (frequency domain) d/dt -> jw for Maxwell’s equations

Question 29

Lossless medium

Answer 29

A lossless medium is a medium with zero conductivity and finite permeability and permittivity