CWDP Antenna Design and Placement Flashcards

What is the purpose of using diversity antennas on an access point?

Answer: To reduce multipath fading by selecting the best signal path

Antenna diversity selects the best-receiving antenna at any moment, mitigating multipath-induced signal fading.

In a stadium deployment requiring coverage of tiered seating, which antenna configuration is most effective?

Answer: Multiple sector antennas aimed at seating sections

Sector antennas aimed at specific seating zones provide targeted coverage without wasting signal toward empty areas.

What is a parasitic element in antenna design used to achieve?

Answer: Modify the radiation pattern by passive coupling

Parasitic elements like directors and reflectors in a Yagi shape the radiation pattern without being directly fed.

Why is antenna impedance matching (typically 50 ohms) important in WLAN installations?

Answer: It maximizes power transfer and minimizes reflected power

Matched impedance minimizes standing wave ratio (SWR), ensuring maximum power is radiated rather than reflected.

A CWDP designer is deploying APs in a metal-shelving warehouse. What antenna placement strategy best reduces multipath?

Answer: Mount APs high on the ceiling above the shelving

High ceiling mounts above shelving reduce reflections from metal surfaces and provide cleaner line-of-sight paths.

Which regulatory body in the US governs outdoor WLAN antenna and power limits?

Answer: FCC

The Federal Communications Commission (FCC) regulates RF emissions, power levels, and antenna use under Part 15 rules.