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RF Cafe Quizzes.
Note: Some material based on books have quoted passages.
quiz is based on the information presented in Frequency-Agile Antennas for Wireless Communications,
by Aldo Petosa.
Graciously provided by
1. 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)
2. 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 directivity
3. 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 mechanical
When did microstrip antennas start coming into common use?
a) In the 1920s
In the 1950s
c) In the 1970s
d) In the 1990s
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
6. 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
7. 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 manipulation
What methods of mechanical tuning are practical for frequency agile antennas (FAAs)?
Electrostatic and magnetostatic
c) Hydraulic and pneumatic
d) All the above
9. What is a major advantage of liquid
crystals over ferroelectric substrates?
a) Lower bias voltage
c) Higher bandwidth
d) Larger physical size
10. What is the most widely used component type for continuous tuning
a) Schottky diodes
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answers and explanations.