Antenna Systems
Subelement E
Section 42
Waveguides-1
Materials employed must not be ferromagnetic, i.e. their magnetic permeability must be zero.
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A microwave transmission line constructed of a center conductor suspended between parallel conductive ground planes is called:
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Microstrip.
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Coax.
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Correct AnswerStripline.
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Waveguide.
A.k.a. a planar transmission line. The ground planes are strips of metal, thus the name "Stripline".
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Waveguide theory is based upon:
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Correct AnswerThe movement of an electromagnetic field.
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Current flow through conductive wires.
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Inductance.
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Resonant charging.
Electromagnetic waves do indeed move along a waveguide, so Answer A. is the right one.
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A waveguide is used at RADAR microwave frequencies because:
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It is easier to install than other feedline types.
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It is more rugged than other feedline types.
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It is less expensive than other feedline types.
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Correct AnswerIt has lower transmission losses than other feedline types.
As frequency increases, coaxial cable diameter must decrease and small-diameter coax is incredibly lossy at microwave frequencies excpet for very, very short cable runs.
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Waveguide theory is based on the principals of:
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Ohm's Law.
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High standing waves.
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Correct AnswerSkin effect and use of ΒΌ wave stubs.
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None of the above.
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How is the signal removed from a waveguide or magnetron?
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With a thin wire called a T-hook.
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Correct AnswerWith a thin wire called a J-Hook.
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With a coaxial connector.
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With a waveguide flange joint.
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