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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.
quiz is based on the information presented in
Microstrip Lines and Slotlines, by Ramesh Garg, Inder Bahl, and Maurizio Bozzi.
Graciously provided by
1. What is a principal requirement for a transmission structure to be suitable
as a circuit element in a microwave integrated circuit (MIC)?
a) It needs to be rectangular
b) It must be copper plated
c) It is usually much wider than it is long
It should be planar in configuration.
2. What are two
consequences of the non-TEM behavior of microstrip lines?
a) Effective dielectric
constant and impedance are functions of frequency
b) A lower cutoff frequency is established,
like with waveguide
c) An upper frequency is established due to the critical angle
d) Their combined effects are negligible
of the three drawings below represents the highest performance method of transitioning from coaxial
connector to microstrip?
(a) (b) (c)
a) Straight inline transition
b) 90° transition
c) Tapered transition
d) All perform the same
4. What is full-wave analysis?
a) Field analysis invoking quasi-static approximations
b) Field analysis
not invoking quasi-static approximations
c) Field analysis that include a full
wavelength of the lowest frequency
d) Field analysis that include a full wavelength of
the highest frequency
5. What happens to the temperature
of microstrip as the frequency increases?
a) Thermoelectric dispersion causes cooling
b) Eddy currents in the metal cause heating
c) Dielectric heating causes a temperature
d) Frequency has no effect
6. What are
examples of discontinuities in microstrip?
a) Open ends and gaps
in width and right-angle bends
c) T and cross junctions
d) All the above
7. Where does the wave propagate in a slotline?
a) Along the slot
b) Perpendicular to the slot
c) Above the slot
Below the slot
8. What is a Defected Ground Surface
a) An artifact of imperfect substrate fabrication
b) A discontinuity
caused by thermal stress
c) An intentional deviation from a continuous flat ground plane.
d) A ground plane that goes over to "the other side"
What is the distinguishing feature of a coplanar waveguide?
a) All elements are collocated
in the substrate stack
b) All elements are collocated on the same surface of the substrate
c) The waveguide is formed by etching a 3-dimensional channel in the substrate
The waveguide section soldered to the substrate inline with the microstrip or stripline
10. What is the name given to a configuration whereby two
transmission lines are placed parallel to each other and in close proximity?
b) Isolated line
c) Guard band structure
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answers and explanations.