1996 - 2016
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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All RF Cafe quizzes would make perfect fodder for 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.
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Note: Many answers contain passages quoted in whole or in part from the text.
This quiz is based on the information presented in Practical Microwave Circuits, by Stephen A. Maas.
Note: Some of these books are available as prizes in the monthly RF Cafe Giveaway.
"This book is a collection of things I learned. largely on my own, over forty years in microwave circuit design. While almost all of the material in this book existed somewhere in some form, no single source was comprehensive and accessible. I learned most of it by experience, talking to people and digging through technical papers and books. In some cases, I just had to figure it out..."
1. Where are coupled transmission lines likely to be found?
b) Directional couplers.
d) All the above.
2. What is a homogeneous transmission line?
a) A transmission line with a constant cross-section.
b) A transmission line with a single conductor.
c) A transmission line which can only be mated to a similar transmission line.
d) A transmission line in which all of the field lines are contained within a single dielectric medium.
3. Which transmission line is an example of a non-homogeneous transmission line?
a) Ladder line.
c) Coaxial line.
4. Which problem did the Lange coupler solve for two-strip planar couplers?
a) The inability to achieve sufficient coupling between two edge-coupled strips to realize a 3-dB coupler.
b) The inability to prevent excessive coupling between two edge-coupled strips to realize a 3-dB coupler
c) High frequency operation became possible.
d) Low frequency operation became possible.
5. Which of the following describes a balanced transmission line?
a) Two lines equally distributed on the substrate.
b) Even and odd mode waves are equal on both conductors.
c) The ground is used as a conductor.
d) Two conductors of identical cross-section surrounded by free space (isolated from ground).
6. Which of the following describes an unbalanced transmission line?
a) Two lines unequally distributed on the substrate.
b) Fringing fields "leak" from the edges of the conductor.
c) Uses the ground surface as one conductor.
d) Unequal currents in the conductors.
7. When did S parameters first come into common use?
8. What is the main difference between microwave and lower frequency analog circuit design?
a) Microwave design focuses more on maximum power transfer whereas lower frequency circuit
design focuses more on voltage gain.
b) Microwaves are at a higher frequency.
c) Microwave circuits require more curent.
d) Analog circuits are available in integrated form.
9. What is another name for a normalized lowpass filter design?
a) A Butterworth filter.
b) A Chebyshev filter.
c) A complimentary network.
d) A prototype network.
10. What is meant by "de-embedding" S parameters?
a) Removing embedded losses from the measurement.
b) Removing all effects test fixture elements from the measurement of a discrete component being measured.
c) Removing capacitive influences.
d) Removing even and odd mode waves from the equation.
Need some help? Click here for the answers and explanations.