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.
Some of these books used in quizzes are available as prizes
in the monthly RF Cafe Giveaway.
Note: Many answers contain passages quoted in whole or in part from the text.
quiz is based on the information presented in Introduction to Antenna Analysis Using EM Simulation, by
Hiroaki Kogure, Yoshie Kogure, and James C. Rautio, published by Artech House. This book is also a great source of
antenna fundamentals and a little communications history.
Sonnet Lite is a free
download provided by the Sonnet company, of Syracuse, NY.
1. What was the James
C. Ratio's first antenna design program?
2. Just exactly is an antenna?
a) Any metal structure
c) Any structure that performs the function of transmitting and receiving
d) The little feely thing on the bugs' heads
is the approximate location of the near field / far field transition?
a) λ/10 from the antenna
from the antenna
c) λ from the antenna
d) 2λ from the antenna
4. What does a time-varying magnetic field generate?
a) An electric field
orthogonal magnetic field
c) An amplitude modulated gravity wave
d) Cancellation of all fields
5. What is the impedance of a minimum-loss coaxial cable with an air dielectric?
a) 25 Ω
b) 50 Ω
c) 75 Ω
d) 100 Ω
6. How is dielectric material modeled in an EM simulator?
a) Series RC
c) Series RL
d) Parallel RL
7. What happens to magnetic flux if
current through the loop is doubled?
a) It also doubles
b) It increases as the square of the current
c) It increases as the square root of the current
d) It increases as the 4th power of the current
8. For an input power of 1 W, what is the output power of a lossless passive antenna with a specified
gain of 3 dB or 6 dB?
a) 1/2 W and 1 W, respectively
b) 1 W for both gains
c) 2 W and 4 W, respectively
d) 3 W and 6 W, respectively
9. Where does a log-periodic antenna get its name?
a) The shape resembles a log
with straight branches
b) It is the dual of the linear antenna
c) From logarithmic diameter ratios of the
d) From the logarithmic spacing and length of its dipoles
10. Proper test environments are crucial to reliable EM field measurements as evidenced by
what factor in Heinrich Hertz's early experiments?
a) Nearby AC lighting
b) Metal buttons on his
c) Wet wooden roof from a rain storm
d) A nearby pot bellied stove
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answers and explanations.