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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 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






2. 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






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






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






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






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






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






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






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






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






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






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






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






14. 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






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






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






17. 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






18. Refers to the the back of an antenna






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






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






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






22. 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)






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






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






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