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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 region of a CE bipolar transistor is collector current almost constant?

    • Options
    • A. Saturation region
    • B. Active region
    • C. Breakdown region
    • D. Both saturation and active region
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    • 2. The Q factor of a waveguide resonator is given by (?0 is resonant frequency, U is energy storage and WL is the power loss)

    • Options
    • A.
    • B.
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    • 3. In a resistance strain gauge, G = 2, stress = 1050 kg/cm2, R = 1000 ?. The value of ?R will be

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    • A. 2 ?
    • B. 3 ?
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    • D. 1 ?
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    • 4. In a broadcast superheterodyne receiver

    • Options
    • A. the local oscillator operates below the signal frequency
    • B. local oscillator frequency is normally double the IF
    • C. RF amplifier normally works at kHz above the carrier frequency
    • D. mixer input must be tuned to the signal frequency
      • Discuss
    • 5. FM receivers using the standard 88 to 108 MHz band use IF of

    • Options
    • A. 8 MHz
    • B. 9.9 MHz
    • C. 10.7 MHz
    • D. 12.2 MHz
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    • 6. Which one of the following potential does not satisfy Laplace's equations?

    • Options
    • A. v = 10 xy
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    • 7. The rate at which information can be carried through a communication channel depends on

    • Options
    • A. carrier frequency
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    • 8. Generally the wall thickness of rectangular waveguide is

    • Options
    • A. about 1-5 mils
    • B. about 40-100 mils
    • C. about 0.1 to 0.5 mils
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    • Options
    • A. will increase
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    • Options
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