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

Reduced radio frequency interference from neighboring networks

Answer

Simplified antenna installation requiring fewer cables

Answer

Lower power consumption compared to single-antenna systems

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

The angle at which the antenna operates at half its rated frequency

Answer

The power output when the antenna is operating at 50% duty cycle

Answer

The angle between the antenna element and the mounting surface

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

BNC connector

Answer

N-type connector

Answer

F-type connector

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

Cable loss increases effective transmit power by amplifying the signal

Answer

Cable loss has no measurable effect on transmit power in properly installed systems

Answer

Cable loss only affects received signals, not transmitted signals

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

Omnidirectional dipole antenna

Answer

Yagi-Uda array antenna

Answer

Parabolic grid antenna

Question 6

What is the purpose of mechanical or electrical antenna downtilt in a WLAN or cellular deployment?

Accepted Answer

To direct the coverage pattern downward, reducing inter-cell interference and improving local coverage

Answer

To increase the antenna's operating frequency range

Answer

To protect the antenna from physical damage due to wind loading

Answer

To increase the effective height of the antenna mounting structure

Question 7

What is the significance of the front-to-back (F/B) ratio in a directional antenna?

Accepted Answer

It measures the ratio of gain in the main forward lobe versus the rear lobe, indicating rejection of signals from behind

Answer

It describes the physical dimensions of the antenna element

Answer

It compares the gain at the antenna feed point to the gain at the tip

Answer

It defines the difference in gain between 2.4 GHz and 5 GHz operation