Custom Search
Over 10000 Pages Indexed
Your Host
Click here to read about RF CafeKirt

... single-
what an
engineering website
should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5CCG (5th MOB):
My USAF radar shop

Hobby & Fun

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse
riding business website -
lots of info

•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Job Board

About RF Cafe©

RF Cafe E-Mail

Frequency-Agile Antennas for Wireless Communications
RF Cafe Quiz #57

| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 |
| 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 |
| 55 | 56 | 57 | 58 | 59 |

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 from the text.

Frequency-Agile Antennas for Wireless Communcations - RF Cafe Featured BookThis quiz is based on the information presented in Frequency-Agile Antennas for Wireless Communications, by Aldo Petosa.

Graciously provided by Artech House







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
c)  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

4.  When did microstrip antennas start coming into common use?

a)  In the 1920s
b)  In the 1950s
c)  In the 1970s
d)  In the 1990s

5.  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
d)  Tesseractical and cubical

6.  What type of tuning is typically available for antennas?

a)  Changing one or more physical dimensions
b)  Altering material properties
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
c)  By harmonic inversion
d)  By optical manipulation

8.  What methods of mechanical tuning are practical for frequency agile antennas (FAAs)?

a)  Electrostatic and magnetostatic
b)  Piezoelectric
c)  Hydraulic and pneumatic
d)  All the above

9.  What is a major advantage of liquid crystals over ferroelectric substrates?

a)  Lower bias voltage
b)  Higher switching frequency
c)  Higher bandwidth
d)  Larger physical size

10.  What is the most widely used component type for continuous tuning FFAs?

a)  Schottky diodes
b)  Photodiodes
c)  MEMS
d)  Varactor diodes

Need some help? Click here for the answers and explanations.

A Disruptive Web Presence

Custom Search
Over 10,000 pages indexed! (none duped or pirated)

Read About RF Cafe
Webmaster: Kirt Blattenberger

RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

RF & EE Symbols Word
RF Stencils for Visio

Product & Service Directory
Personally Selected Manufacturers
RF Cafe T-Shirts & Mugs

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel