CWS Antenna Theory & Types 2

Question 1

What is the primary advantage of a MIMO antenna system in 802.11n and 802.11ac wireless networks?

Accepted Answer

Increased throughput by transmitting multiple independent data streams simultaneously

Answer

MIMO (Multiple Input Multiple Output) uses spatial multiplexing to transmit multiple independent data streams over separate spatial paths simultaneously, significantly increasing throughput.

Question 2

How is the half-power beamwidth (HPBW) of an antenna defined?

Accepted Answer

The angular width of the main lobe where gain is within 3 dB of its maximum value

Answer

HPBW is the angular range of the main lobe between the two points where the antenna's gain drops to half its peak value, equivalent to a 3 dB reduction.

Question 3

Which RF connector type is most commonly found on indoor consumer and enterprise WLAN antennas and access points?

Accepted Answer

RP-SMA connector

Answer

The RP-SMA (Reverse Polarity SMA) connector is the standard connector for indoor WLAN devices, chosen for its compact size and FCC-required reverse polarity design to prevent use of unauthorized high-gain antennas.

Question 4

How does coaxial cable loss affect the effective transmit power of a wireless system?

Accepted Answer

Cable loss reduces the effective transmit power delivered to the antenna

Answer

Coaxial cable has inherent resistive losses that attenuate the signal, reducing the power that reaches the antenna and lowering the overall EIRP of the system.

Question 5

Which antenna type is typically used to provide sector-based directional coverage in enterprise indoor or outdoor WLAN deployments?

Accepted Answer

Flat patch or panel antenna

Answer

Flat patch or panel antennas provide a defined directional coverage sector (typically 60–120 degrees) and moderate gain, making them ideal for covering specific areas in enterprise deployments.

(CWS) Certified Wireless Specialist Practice Test

(CWS) Certified Wireless Specialist Practice Test

CWS Antenna Theory & Types 2