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Test your basic knowledge |
CWNA Radio Frequency Signal And Antenna Concepts
Start Test
Study First
Subjects
:
cisco
,
it-skills
,
cwna
Instructions:
Answer 25 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Strictly used for point-to-point communications - typicall to provide network bridging between two buildings. These provide the most focused - narrow beamwidth of any of the antenna types. There are two types of these: parabolic dish and grid
Fresnel zone
ighly-directional antenna
attenuator
lightening arrestor
2. Any RF communications system that has multiple antennas at both ends of the communications link and being used concurrently
antenna diversity
multiple input multiple output (MIMO)
voltage standing wave ratio (VSWR)
splitters
3. Starts with a y. A type of semi-directional antenna designed to direct a signal in a specific direction. Used for short to medium-distance communication
omni-directional antenna
yagi
parabolic dish antenna
voltage standing wave ratio (VSWR)
4. A numerical relationship between the measurement of the maximum voltage along the line (what is generated by the transmitter) and the measurement of the mimimum voltage along the line (what is received by the antenna)
voltage standing wave ratio (VSWR)
dipole antenna
patch antenna
Fresnel zone
5. Takes an RF signal and divides it into two or more separate signals
splitters
earth bulge
dipole antenna
antenna polarization
6. A type of antenna that is designed to direct a signal in a specifi direction
omni-directional antenna
semi-directional antenna
attenuator
back lobe
7. An antenna system made up of multiple antennas that are connected to the signal processor.
back lobe
phased array antenna
dipole antenna
antenna diversity
8. Labeled E-plane - shows the side view of the radiation pattner of the antenna
grid
elevation charts
splitters
azimuth charts
9. The measurement of how broad or narrow the focus of an antenna is. Measured both horizontally and vertically
beamwidth
omni-directional antenna
antenna diversity
back lobe
10. The curvature of the earth - which must be considered when installing long distance point-to-point RF communications
omni-directional antenna
yagi
attenuator
earth bulge
11. Refers to the the back of an antenna
splitters
multiple input multiple output (MIMO)
back lobe
attenuator
12. Small devices about the size of a C-cell battery - with cable connectors on both sides. They absorb energy - decreasing the signal as it travels through. Fixed types provide a set amount of loss. Variable loss types have a dial on it that allows you
omni-directional antenna
phased array antenna
attenuator
ighly-directional antenna
13. An antenna that consists of two elements. A half-wave type antenna consists of two elements - each 1/4 of the wavelength long
phased array antenna
ighly-directional antenna
voltage standing wave ratio (VSWR)
dipole antenna
14. A highly-directional antenna that is similiar to the small digital satellite TV antennas that can be seen on the roofs of many houses
yagi
back lobe
parabolic dish antenna
azimuth charts
15. Labeled H-plane - shows the top-down view of the radiation pattern of the antenna
azimuth charts
omni-directional antenna
phased array antenna
voltage standing wave ratio (VSWR)
16. An imaginary football-shaped area that surrounds the path of the visual LOS between two point-to-point antennas
panel antenna
voltage standing wave ratio (VSWR)
lightening arrestor
Fresnel zone
17. When light travels from one point to another - it travels across What is perceived to be an unobstructed straight line
ighly-directional antenna
antenna polarization
line of sight (LOS)
multiple input multiple output (MIMO)
18. A type of antenna that radiates RF signals in all directions
multiple input multiple output (MIMO)
Fresnel zone
omni-directional antenna
splitters
19. A highly-directional antenna taht resembles the rectangular grill of a barbeque - with the edges slightly curved inward. The spacing of the wries on this is determined by the wavelength of the frequencies that the antenna is designed for
grid
omni-directional antenna
azimuth charts
beamwidth
20. A type of semi-directional planar antenna designed to direct a signal in a specific direction.
sector antenna
patch antenna
ighly-directional antenna
parabolic dish antenna
21. The orientation of the antenna. Antennas radiate RF signals with the amplitude of the waves fluctuating either vertically or horizontally
grid
sector antenna
antenna polarization
antenna diversity
22. A type of semi-directional planar antenna designed to direct a signal in a specific direction. Used for short-to medium-distance communications
patch antenna
panel antenna
voltage standing wave ratio (VSWR)
grid
23. A device that redirects (shunts) transient currents caused by nearby lighting strikes or ambient static away from your electronic equipment and into the ground
panel antenna
lightening arrestor
yagi
parabolic dish antenna
24. When an access point has two antennas and receivers functioning together to minimize the negative effects of multipath
ighly-directional antenna
antenna diversity
beamwidth
multiple input multiple output (MIMO)
25. A special type of high-gain - semi-directional antenna that provide a pie-shaped coverage pattern
sector antenna
azimuth charts
attenuator
splitters