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hbhbjknjndKJKWNDWJN,JN,,NKDNNCM,am,xs,dndx,ms sxmsad, Exercises of Power Electronics

Institute Pertanian Bogor University (IPBU)Power Electronics

CADCasX SCM,SDNCM, M M MNJNXJNMZ MnXM XNMGJHSJHBDGGHSADFFFHGABNESJJJJIKKLMKKLKKMKLKKNJNJBBBNNJJSJKSDNNCJSDDJDNCNKDSVF

Typology: Exercises

2017/2018

Uploaded on 11/17/2018

rmanhhj 🇮🇩

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Fundamentals of Antennas

Week 1 Assignment

1. The measured HPBWs of an antenna in the two orthogonal planes are 30° and 20°. The

approximate gain of the antennain dB is : (2)

a. 17.3dB

b. 18.4dB(Ans)

c. 23.1dB

d. 31.5dB

2. The E-field pattern of an antenna varies as 3+2cosθ, where, angle θ is measured fr om

broadside. The approx. HPBW of the antenna is : (2)

a. 151o

b. 149o (Ans)

c. 31o

d. 25o

3. For an omnidirectional antenna, first null beam width (FNBW) in E-planeis 45o, the

approximate directivity in dB is : (2)

a. 15.2dB

b. 13.0dB

c. 7.6dB(Ans)

d. 6.5dB

4. The axial ratio of an antenna is 1.2. It is acceptable for which polarization : (1)

a. Linear

b. Circular (Ans)

c. Elliptical

d. Depends on the direction of wave propagation

5. If reflection coefficient of an antenna is 0.5at a frequency of 900 MHz, then

5.1 The value of voltage standing wave ratio(VSWR) is: (1)

a. 5

b. 3 (Ans)

c. 2

d. 1

5.2 The percentage power transmittedby antenna is: (1)

a. 75% (Ans)

b. 50%

c. 25%

d. 10%

6. If the antenna input impedanceis (30+j40)Ωat 2.45GHz, the percentage reflected power from

the antenna is : (2)

a. 0

b. 25%(Ans)

c. 75%

d. None of these

7. A GSM1800 cell tower antenna with 16dB gain is transmitting 10W of power at 1845 MHz.

The power density at a distance of 50m in the direction of maximum radiation is : (2)

a. 4.0 mWatt/m2

b. 6.4 mWatt/m2

c. 12.7 mWatt/m2(Ans)

d. 14.2 mWatt/m2

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Fundamentals of Antennas

Week 1 Assignment

The measured HPBWs of an antenna in the two orthogonal planes are 30° and 20°. The approximate gain of the antennain dB is : (2) a. 17.3dB b. 18.4dB(Ans) c. 23.1dB d. 31.5dB
The E-field pattern of an antenna varies as 3+2cosθ, where, angle θ is measured from broadside. The approx. HPBW of the antenna is : (2) a. 151 o b. 149 o^ (Ans) c. 31 o d. 25 o
For an omnidirectional antenna, first null beam width (FNBW) in E-planeis 45 o, the approximate directivity in dB is : (2) a. 15.2dB b. 13.0dB c. 7.6dB(Ans) d. 6.5dB
The axial ratio of an antenna is 1.2. It is acceptable for which polarization : (1) a. Linear b. Circular (Ans) c. Elliptical d. Depends on the direction of wave propagation
If reflection coefficient of an antenna is 0.5at a frequency of 900 MHz, then 5.1 The value of voltage standing wave ratio(VSWR) is: (1) a. 5 b. 3 (Ans) c. 2 d. 1 5.2 The percentage power transmittedby antenna is: (1) a. 75% (Ans) b. 50% c. 25% d. 10%
If the antenna input impedanceis (30+j40)Ωat 2.45GHz, the percentage reflected power from the antenna is : (2) a. 0 b. 25%(Ans) c. 75% d. None of these
A GSM1800 cell tower antenna with 16dB gain is transmitting 10W of power at 1845 MHz. The power density at a distance of 50m in the direction of maximum radiation is : (2) a. 4.0 mWatt/m^2 b. 6.4 mWatt/m^2 c. 12.7 mWatt/m^2 (Ans) d. 14.2 mWatt/m^2

Two identical transmitting and receiving antennasare located at a distance of 2km. Power transmitted is 30dBm at 15GHzand received poweris -70dBm, the approximate gain ofeach antenna is : (2) a. 11dB(Ans) b. 21dB c. 41dB d. 51dB
Transmitting and receiving antennas operating at 1GHz with gains of 20dB and 15dB, respectively, are separated by a distance of 1 km. Assume that the transmitting antenna is circularly polarized and the receiving antenna is linearly polarized. If the transmitted power is 150W, the received power is : (3) a. -5.6dBm b. -7.2dBm c. -8.6dBm(Ans) d. -10.2dBm
The diameter of a parabolic dish antenna for 40dB gain at 11GHz is……:(Assume that efficiency η of the antenna is 65%.) (2) a. 2.0m b. 1.5m c. 1.1m (Ans) d. 0.9m