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Electromagnetic Field Theory problems

  • 1. Two identical antennas are placed in the ? = p/2 plane as shown in the figure. The elements have equal amplitude excitation with 180° polarity difference, operating of the far-zone resultant electric field strength normalized with that of a single element, both computed for ? = 0, is
    Electronics and Communication Engineering Electromagnetic Field Theory: Two identical antennas are placed in the ? = p/2 plane as shown in the f

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 2. Calculate the directivity of an antenna for ?E = 30°, ?H = 60

  • Options
  • A. 46
  • B. 23
  • C. 50
  • D. 100
    • Discuss
  • 3. A broadside array consisting of 200 cm wavelength with 10 half-wave dipole spacing 10 cm. And if each array element feeding with 1 amp. current and operating at same frequency then find the half power beamwidth

  • Options
  • A. 4°
  • B. 2°
  • C. 10°
  • D. 15°
    • Discuss
  • 4. A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls find cut off wavelength for dominant mode.

  • Options
  • A. 4 cm
  • B. 1 cm
  • C. 2 cm
  • D. 8 cm
    • Discuss
  • 5. A (75 - j 40) W load is connected to a co-axial line of z0 = 75? at 6 MHz. The load matching on the line can be accomplished by connecting

  • Options
  • A. a short circuit stub at the load
  • B. an inductance at the load
  • C. a short circuit stub at a specific distance from the load
  • D. a capacitance at a specific distance from the load
    • Discuss
  • 6. The electric field of the incident wave is Electronics and Communication Engineering Electromagnetic Field Theory: The electric field of the incident wave is, where ? = 3 x 109p and ? = 10 p. The electric field of the transmitted wave Et is given by

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 7. The electric field on the surface of a perfect conductor is 2V/m. The conductor is immersed in water with ? = 80 ?0. The surface charge density on the conductor is ((?0 = 10-9/36p)F/m)

  • Options
  • A. 0 c/m2
  • B. 2 c/m2
  • C. 1.8 x 10-11 c/m2
  • D. 1.14 x 10-9 c/m2
    • Discuss
  • 8. The phase angle corresponding to ?/4 in a standing-wave pattern is

  • Options
  • A. 30°
  • B. 90°
  • C. 135°
  • D. 180°
    • Discuss
  • 9. Which one of the following potential does not satisfy Laplace's equations?

  • Options
  • A. v = 10 xy
  • B. v = p cos ?
  • C.
  • D. v = f cos ? + 10
    • Discuss
  • 10. Most antenna consisting of a 50 meter long vertical conductor operates over a perfectly conducting ground plane. It is base fed at a frequency of 600 kHz. The radiation resistance of the antenna in ohms is

  • Options
  • A.
  • B.
  • C.
  • D. 20p2
    • Discuss

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