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.
Click here for the complete list of RF Cafe
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 Frequency-Agile Antennas for Wireless Communications,
by Aldo Petosa.
Graciously provided by
To which class of antennas do frequency agile antennas (FAAs) belong?
a) Federal aviation antennas (FAAs)
b) Passive integrated antennas (PIAs)
c) Active integrated antennas (AIAs)
d) Cross-Influenced Antennas (CIAs)
How does antenna gain differ from antenna directivity?
a) There is no difference
b) Gain only applies to active antennas
Gain can only be positive whereas directivity can be negative
d) Gain accounts for losses
as well as directivity3.
What are the two types of tuning
used in FAAs?
a) Discrete and continuous
b) High power and low power
c) Manual and automatic
d) Electronic and mechanical4.
When did microstrip antennas start coming into common use?
a) In the 1920s
In the 1950s
c) In the 1970s
d) In the 1990s5.
For which microstrip patch antenna formats does Frequency-Agile Antennas for Wireless Communications
provide field equations?
a) Rectangular, dipole, circular, and annular (ring)
b) Spherical and tesseractical
c) Cubical and spherical
What type of tuning is typically available
a) Changing one or more physical dimensions
b) Altering material
c) Switching and/or tunable electronics
d) All the above
How can the permittivity of ferroelectric substrates be altered?
a) By applying a mechanical stress
b) By applying an electric field
By harmonic inversion
d) By optical manipulation8.
What methods of mechanical tuning are practical for frequency agile antennas (FAAs)?
Electrostatic and magnetostatic
c) Hydraulic and pneumatic
d) All the above9.
What is a major advantage of liquid
crystals over ferroelectric substrates?
a) Lower bias voltage
c) Higher bandwidth
d) Larger physical size
What is the most widely used component type for continuous tuning
a) Schottky diodes
Need some help? Click here for the
answers and explanations.