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CWNA Radio Frequency Signal And Antenna Concepts

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






2. 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)






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






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






5. 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






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






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






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






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






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






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






12. Refers to the the back of an antenna






13. 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






14. 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






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






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






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






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






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






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






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






23. The orientation of the antenna. Antennas radiate RF signals with the amplitude of the waves fluctuating either vertically or horizontally






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






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