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Note: Many answers contain passages quoted from the text.
This quiz is based on the information presented in Frequency-Agile Antennas for Wireless
Communications, by Aldo Petosa.
Note: Some of these
books are available as prizes in the monthly
RF Cafe Giveaway.
1. To which class of antennas do frequency
agile antennas (FAAs) belong?
a) Federal aviation antennas (FAAs)
Passive integrated antennas (PIAs)
Active integrated antennas (AIAs)
d) Cross-Influenced Antennas (CIAs)
2. How does antenna gain differ from antenna
a) There is no difference
Gain only applies to active antennas
c) Gain can only be positive whereas
directivity can be negative
d) Gain accounts for losses as well as
3. What are the two
types of tuning used in FAAs?
Discrete and continuous
b) High power and low power
c) Manual and
d) Electronic and mechanical
4. When did microstrip antennas
start coming into common use?
In the 1920s
b) In the 1950s
c) In the 1970s
d) In the
5. For which
microstrip patch antenna formats does Frequency-Agile Antennas for Wireless Communications
provide field equations?
Rectangular, dipole, circular, and annular (ring)
b) Spherical and
c) Cubical and spherical
d) Tesseractical and
6. What type of tuning is typically
available for antennas?
Changing one or more physical dimensions
b) Altering material properties
Switching and/or tunable electronics
d) All the above
How can the permittivity of ferroelectric substrates be altered?
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
d) All the above
9. What is
a major advantage of liquid crystals over ferroelectric substrates?
Lower bias voltage
b) Higher switching frequency
d) Larger physical size
What is the most widely used component type for continuous tuning FFAs?
d) Varactor diodes
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answers and explanations.