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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.
This
quiz is based on the information presented in
Microwave Circulator Design, 2nd Edition, by Douglas K. Linkhart.
Graciously provided by
Artech House
Circulator design has advanced significantly since the first edition of this book was published
25 years ago. The objective of this second edition is to present theory, information, and design
procedures that will enable microwave engineers and technicians to design and build circulators
successfully. This resource contains a discussion of the various units used in the circulator
design computations, as well as covers the theory of operation. This book presents numerous applications,
giving microwave engineers new ideas about how to solve problems using circulators.
1. What is the primary characteristic of a circulator?
a) It is round in shape b) It must be free to rotate c) Energy is evenly
distributed among all ports d) Energy entering one port is coupled to an adjacent port,
but to no other ports
2. What is a common mechanical analog of ferrimagnetic resonance?
a) A level b) An inclined plane c) A gyroscope d) A massive
body
3. What explains nonreciprocal action in ferrites?
a) Coupling of microwave energy with electron spins b) Coupling of microwave
energy with electron orbital motion c) Diode action d) Rectifier action
4. What explains nonreciprocal action in semiconductors?
a) Coupling of microwave energy with electron spins b) Coupling of microwave
energy with electron orbital motion c) Diode action d) Rectifier action
5. What are ferrites?
a) Natural magnets b) Toroidal magnets c) Artificial ferrimagnetic
materials d) Fuzzy pets
6. In which resonance region do most waveguide circulators operate?
a) Above resonance b) Below resonance c) Both above and below resonance
d) Neither above nor below resonance
7. Which type of circulator typically has the highest power handling
capability?
a) Differential phase shift b) Lumped constant c) Okada d)
Field displacement
8. What is the primary difference between a circulator and an isolator?
a) Circulators are round, whereas isolators are not b) The isolator has an internally
terminated, inaccessible port c) Isolators have higher power handling than circulators
d) Circulators have higher power handling than isolators
9. How important is the microwave transmission medium (waveguide, stripline,
coaxial line) in ferrite selection?
a) Each transmission medium type has specific needs b) Transmission medium type
is not important c) Waveguide requires a different ferrite type than stripline and coaxial
line d) Waveguide and stripline require a different ferrite type than coaxial line
10. What can be the result of imperfect contact between the ferrite
and the ground plane?
a) Undesired resonances b) Generally poor electrical performance c)
Both a) and b) d) Neither a) nor b)
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