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  • Question

  • 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
    Two identical antennas are placed in the ? = p/2 plane as shown in the figure. The elements have equ


  • Options
  • A. Two identical antennas are placed in the ? = p/2 plane as shown in the figure. The elements have equ
  • B. Two identical antennas are placed in the ? = p/2 plane as shown in the figure. The elements have equ
  • C. Two identical antennas are placed in the ? = p/2 plane as shown in the figure. The elements have equ
  • D. Two identical antennas are placed in the ? = p/2 plane as shown in the figure. The elements have equ

  • Correct Answer
  •  

    Explanation
    Normalised array factor = n cos Two identical antennas are placed in the ? = p/2 plane as shown in the figure. The elements have equ

    Two identical antennas are placed in the ? = p/2 plane as shown in the figure. The elements have equ

    where ? is the phase difference.

    ⟹ ? = (?d sin ? cos ? + ?1)

    and ? = 90°, ? = 45°

    Two identical antennas are placed in the ? = p/2 plane as shown in the figure. The elements have equ

    More questions

    • 1. In which mode of circular waveguide does the attenuation continuously decrease as frequency is increased?

    • Options
    • A. TE01
    • B. TE11
    • C. TE05
    • D. TE21
      • Discuss
    • 2. The beam of a radar should be

    • Options
    • A. very narrow
    • B. very wide
    • C. neither too narrow nor very wide
    • D. either (b) or (c)
      • Discuss
    • 3. If temperature is increased, the temperature coefficient of a metal

    • Options
    • A. increases
    • B. decreases
    • C. may increase or decrease
    • D. remains constant
      • Discuss
    • 4. In an homogeneous dielectric subjected to an electric field E, the dipole moment per unit volume is ?0(?r - 1) E.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The angle ? for a mica capacitor is about

    • Options
    • A. 25°
    • B. 15°
    • C. 5°
    • D. 1°
      • Discuss
    • 6. The quiescent collector current IC, and collector to emitter voltage VCE in a CE connection are the values when

    • Options
    • A. ac signal is zero
    • B. ac signal is low
    • C. ac signal is negative
    • D. either (a) or (b)
      • Discuss
    • 7. Which of the following statement about the amplitude limiter is not valid?

    • Options
    • A. Leak type bias must be used
    • B. Output must be tuned
    • C. The circuit is always biased in class C, by virtue of the leak type bias
    • D. When the input increases past the threshold of limiting, the gain decreases to keep the output constant
      • Discuss
    • 8. Assertion (A): Helium, Argon and Neon are gaseous at room temperature.

      Reason (R): The atoms in Helium, Argon and Neon are chemically extremely inactive.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 9. In figure what is value of IC if ?dc = 100. Neglect VBE

    • Options
    • A. 5 mA
    • B. 5 ?A
    • C. 10 mA
    • D. 10 ?A
      • Discuss
    • 10. The law that (where K is thermal conductivity, ? is electrical conductivity and T is absolute temperature) for all metals is equal to a universal constant is known as

    • Options
    • A. Lorentz law
    • B. Wiedemann Franz law
    • C. Curie Weiss law
    • D. Kittel law
      • Discuss

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