# Introduction to RF Design Using EM SimulatorsRF Cafe Quiz #41

All RF Cafe quizzes would make perfect fodder in employment interviews for technicians or engineers - particularly those who are fresh 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.

Note: Some material based on books have quoted passages.

This 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?

a)  A plasmatic cluster of electrons
b)  The perpendicular component of a gravitational field
c)  An emotion-charged sports arena
d)  The potential gradient in space caused by voltage on a conductor

2.  Where is current flow strongest on a microstrip line?

a)  Along the edges
b)  In the center
c)  Evenly distributed
d)  No current flows in a microstrip line

3.  What is a meander line?

a)  A transmission line that wraps randomly around the substrate
b)  A reception line that wraps randomly around the substrate
c)  A transmission line that snakes back and forth along its length
d)  A transmission line layout named after Julius Meander

4.  Although microstrip lines are modeled as equivalent lumped element circuits, they are actually:

a)  Many lumped elements
b)  Distributed elements
c)  Mechanical elements
d)  Magnetic elements

5.  Why are microstrip line corners mitered in a bend?

a)  To reduce signal reflections
b)  To save metal
c)  To reduce substrate weight
d)  To allow denser packing of circuits

6.  How can crosstalk between metal lines be reduced?

a)  Reduce the signal strength if possible
b)  Use a vertical isolation wall between the lines
c)  Use more separation between lines
d)  All the above

7.  How does current in the ground plane flow relative to the microstrip line above it?

a)  No current flows in the ground plane
b)  Perpendicular to the microstrip line
c)  Vertically
d)  Like a mirror image

8.  What is a main motivation for using a differential pair transmission line?

a)  Crosstalk reduction
b)  High current handling
c)  Higher voltage handling
d)  Space savings

9.  Which waveguide mode has the magnetic field component pointing in the direction of the electromagnetic (EM) wave travel?

a)  Transverse Electromagnetic (TEM) mode
b)  Transverse Magnetic (TM) mode
c)  Transverse Electric (TE) mode
d)  Obverse Magnetic (OE) mode

10.  What is the main limit of a simulator's accuracy?

a)  Computer power
b)  Digitization increment size
c)  Number of circuits
d)  Display resolution