All RF Cafe quizzes would make perfect fodder
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out of school or are relatively new to the work world. Come to think of it, they would
make equally excellent study material for the same persons who are going to be interviewed
for a job.
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RF Cafe Quizzes.
Note: Some material based on books have quoted passages.
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quiz is based on the information presented in Introduction to RF Design Using EM Simulators, by James C.
Rautio, published by Artech House. Note: Some of these books are available as
prizes in the monthly RF Cafe Giveaway.
1. What is an electric field?
d) The potential gradient in space caused
by voltage on a conductor
"The electric field is the potential gradient caused by the voltage of the power
supply (electric potential difference) in the space around lines. (see page 3)
Where is current flow strongest on a microstrip line?
a) Along the edge
Viewed from above, we see that
current distribution is not uniform across the width of the line. It flows most strongly along both edges of the
line. (see page 11)
3. What is
a meander line?
c) A transmission line that snakes back and forth along its length
(see page 38)
4. Although microstrip lines are modeled as equivalent lumped element circuits, they are actually:
b) Distributed elements
Microstrip lines are distributed circuits. (see page 93)
5. Why are microstrip line corners mitered in a bend?
a) To reduce signal reflections
The mitered bend has substantially less reflection since a square corner
distorts the electromagnetic field, causing a reflected wave. (see page 51)
How can crosstalk between metal lines be reduced?
d) All the above
Electromagnetic field lines between
two or more lines can couple enough to induce interference. The trick is to reduce that coupling. (see page 86)
7. How does current in the ground plane flow relative to the microstrip line above it?
d) Like a
When we look at the current on the ground plane, we see that most of it flows almost like a mirror
image on the MSL directly above it. (see page 133)
8. What is a main motivation for using a differential pair transmission line?
The second line carries the return current rather than the ground plane, so less signal
current flows in the ground plane. (see page 161)
Which waveguide mode has the magnetic field component pointing in the direction of the electromagnetic (EM) wave
c) Transverse Electric (TE) mode
The TE mode has all of the electric field perpendicular to the direction
of travel of the EM wave. There is some magnetic field pointing in the direction of travel. (see page 223)
10. What is the main limit of a simulator's accuracy?
Digitization increment size
No matter how much we refine the cells or mesh, we cannot completely eliminate
(see page 270)