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Subel. E
6 questions
Subelement E

Antenna Systems

Section 43

Waveguides-2

A rotary joint is used to:

  • Couple two waveguides together at right angles.
  • Act as a switch between two waveguide runs.
  • Correct Answer
    Connect a stationary waveguide to the antenna array.
  • Maintain pressurization at the end of the waveguide.
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Resistive losses in a waveguide are very small because:

  • Correct Answer
    The inner surface of the waveguide is large.
  • The inner surface of the waveguide is small.
  • The waveguide does not require a ground connection.
  • The heat remains in the waveguide and cannot dissipate.

Resistive losses in a waveguide are very small because:

The inner surface of the waveguide is large.

Mnemonic: "Large Surface, Low Resistance"

Last edited by kacela. Register to edit

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A right-angle bend in an X-band waveguide must have a radius greater than:

  • Three inches.
  • Six inches.
  • One inch.
  • Correct Answer
    Two inches.

X-Band runs from 8 to 12GHz.

Max. wavelength at 8GHz:

λ = c / f

λ = 3x10^8m / 8x10^9Hz

λ = 0.0375m = 3.75cm = 1.48"

2"/ 1.5"= 1.33 = 1/3 margin

Last edited by jahman. Register to edit

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To insert RF energy into or extract RF energy from a waveguide, which of the following would not be used?

  • Correct Answer
    Coupling capacitance.
  • Current loop.
  • Aperture window.
  • Voltage probe.
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The following is true concerning waveguides:

  • Conduction is accomplished by the polarization of electromagnetic and electrostatic fields.
  • Ancillary deflection is employed.
  • The magnetic field is strongest at the center of the waveguide.
  • Correct Answer
    The magnetic field is strongest at the edges of the waveguide.
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At microwave frequencies, waveguides are used instead of conventional coaxial transmission lines because:

  • They are smaller and easier to handle.
  • Correct Answer
    They have considerably less loss.
  • They are lighter since they have hollow centers.
  • Moisture is never a problem with them.
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