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CWNA Radio Frequency Signal And Antenna Concepts
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CWNA Radio Frequency Signal And Antenna Concepts
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1. The orientation of the antenna. Antennas radiate RF signals with the amplitude of the waves fluctuating either vertically or horizontally

2. A type of antenna that is designed to direct a signal in a specifi direction

3. Takes an RF signal and divides it into two or more separate signals

4. Any RF communications system that has multiple antennas at both ends of the communications link and being used concurrently

5. 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

6. The curvature of the earth - which must be considered when installing long distance point-to-point RF communications

7. An antenna that consists of two elements. A half-wave type antenna consists of two elements - each 1/4 of the wavelength long

8. A special type of high-gain - semi-directional antenna that provide a pie-shaped coverage pattern

9. A device that redirects (shunts) transient currents caused by nearby lighting strikes or ambient static away from your electronic equipment and into the ground

10. Labeled H-plane - shows the top-down view of the radiation pattern of the antenna

11. 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

12. Refers to the the back of an antenna

13. Labeled E-plane - shows the side view of the radiation pattner of the antenna

14. The measurement of how broad or narrow the focus of an antenna is. Measured both horizontally and vertically

15. 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

16. 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

17. A type of semi-directional planar antenna designed to direct a signal in a specific direction.

18. A type of antenna that radiates RF signals in all directions

19. A highly-directional antenna that is similiar to the small digital satellite TV antennas that can be seen on the roofs of many houses

20. 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)

21. An antenna system made up of multiple antennas that are connected to the signal processor.

22. When light travels from one point to another - it travels across What is perceived to be an unobstructed straight line

23. When an access point has two antennas and receivers functioning together to minimize the negative effects of multipath

24. An imaginary football-shaped area that surrounds the path of the visual LOS between two point-to-point antennas

25. A type of semi-directional planar antenna designed to direct a signal in a specific direction. Used for short-to medium-distance communications

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