Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

electronics > electrics > Flashcards

electrics Flashcards

1
Q

Types of wire antennas

A

Dipoles, loops and monopoles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Types of aperture antennas

A

parabolic dish

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Types of array antennas

A

two or more antennas operating together

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

wire antenna features

A

lower frequencies (<1Ghz), easy to build, low gain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

aperture antenna features

A

higher frequencies, high performance, high gain, point to point communication

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

array antenna features

A

better performance and flexibility than single antennas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

isotropic radiation pattern

A

radiates equally in all directions (only theoretically possible)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

directional radiation pattern

A

radiates/receives more power in some directions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

omnidirectional radiation pattern

A

non-directional pattern in one plan and directional pattern at 90 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

radiation density equation

A

Si = P / 4pi*r^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

radiation intensity equation

A

U = P / 4pi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

directivity equation

A

D = 4pi*U / P

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

gain equation

A

G = S4pir^2 / P(in) = DP(rad) / P(in) = 4pi / (delta)theta(delta)omega = 4pi*A / lambda^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

effective isotropic radiated power equation

A

P(iso) = P(in)*G

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

radiated power radius equation

A

R = 2D^2 / lambda

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

gain to dBi equation

A

dBi = 10log10(D(max))

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

maximum radiation density equation

A

Si(max) = PG(max) / 4pir^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

antenna effective area equation

A

Ae = P / Si = G*lambda^2 / 4pi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

aperture efficiency equation

A

E(ap) = Ae / A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

radar power density equation

A

P(D) = P(t) / 4pi*r^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

radar power rereadiated equation

A

P(D)sigma = P(t)G(t)sigma / 4pi*r^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

radar power density back at radar equation

A

P(RD) = P(t)G(t)sigma / (4pir^2)^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

radar received power equation

A

P(R) = P(t)G(t)G(r)*lambda^2 *sigma / (4pi)^3 * r^4

24
Q

radar signal-noise ratio equation

A

P(R) / N = P(t)G(t)G(r)sigmalambda^2*Ls / (4pi)^3 *r^4 * N

25
Q

pulsed radar features

A

transmits in pulsed radio frequency signals and receiver times how long it takes for the pulse to hit the target and return

26
Q

pulsed radar range equation

A

R = c*tau(D) / 2 (tau = 2RC)

27
Q

pulsed radar pulse width equation

A

tau <= 2*(delta)R / c

28
Q

pulsed radar range resolution equation

A

(delta)R = c*tau / 2 = c / 2B (B = bandwidth)

29
Q

pulse repetition frequency use

A

used when returning echo pulse time is greater than transmit pulse time to return from echo so ambiguity as to which is which (when t=2R / c > t = 1 / PRF)

30
Q

doppler frequency equation

A

f(D) = 2Vcos(theta) / lambda

31
Q

doppler rader Tx and Rx equation

A

Tx = cos(wot), Rx = Bcos(wdt)

32
Q

doppler resolution equation

A

1 / integration time

33
Q

surface clutter equation

A

sigma(0) = sigma(c) / A(c)

34
Q

doppler ground area equation

A

A(G) = R(delta)phi(delta)R

35
Q

wire antenna wavelength from length equation

A

L = wavelength / 2

36
Q

wire antenna current equation

A

I = Vs / Zg+Za

37
Q

radiation efficiency of antenna equation

A

eff = R(r) / R(r) + R(l)

38
Q

radiated power from normalised intensities

A

P(rad) = integral(2pi->0) integral(pi->0) of s(0) * sin^2(theta) * R^2 d(theta).d(omega)

39
Q

a larger beamwidth will

A

give faster scan coverage, fewer beam positions, poor angular resolution

40
Q

number of beam positions equation

A

N(B) = 2pi / (delta)ohms = 2pi / (delta)theta*(delta)omega

41
Q

dwell time equation

A

t / N(B)

42
Q

effective area of antenna equation

A

A = (D/2)^2 * pi*efficiency

43
Q

radar equation

A

R(max) = ( ( P(t)G^2 lambda^2 sigma) / ( (4pi)^3 P(min) ) )^1/4

44
Q

radar power density incident on target, radar power density collected by target

A

P(inc) = P(t)G(t) / 4piR^2, P(col) = P(t)G(t)sigma / 4pi*r^2

45
Q

signal to jam ratio, when does burn through occur?

A

SJR = P(r) / P(r jam), burn through when SJR=1

46
Q

pulse repetition time equation

A

PRT = pulse-width / duty cycle

47
Q

pulse repetition frequency equation

A

PRF = 1 / PRT = c / 2R(max)

48
Q

average power equation

A

peak power * duty cycle

49
Q

number of hits equation

A

n = (delta)thetaPRF / 6RPM

50
Q

max range equation

A

c / 2*PRF

51
Q

range resolution equation

A

c*tau / 2 (tau = pulse width/s)

52
Q

duty cycle equation

A

pulse duration / pulse repetition interval

53
Q

mean power

A

peak power * duty cycle

54
Q

(delta)theta

A

lambda / width*efficiency

55
Q

(delta)omega

A

lambda / height*efficiency

56
Q

axial ratio equation

A

AR = a / b

57
Q

doppler shift frequency equation

A

f(d) = 2Vcos(theta) / lambda

electronics (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions