CWS Antenna Theory & Types

Question 1

What is the standard unit used to express antenna gain relative to an isotropic radiator?

Accepted Answer

dBi

Answer

dBi (decibels relative to isotropic) expresses gain compared to a theoretical isotropic antenna that radiates equally in all directions.

Question 2

Which antenna type radiates power equally in all horizontal directions, making it ideal for general indoor WLAN coverage?

Accepted Answer

Omnidirectional dipole antenna

Answer

An omnidirectional dipole antenna provides a 360-degree horizontal radiation pattern, making it well-suited for broad indoor WLAN coverage from a central location.

Question 3

What does the acronym EIRP stand for in the context of wireless networking?

Accepted Answer

Effective Isotropic Radiated Power

Answer

EIRP (Effective Isotropic Radiated Power) represents the total power radiated by an antenna system, combining transmit power and antenna gain minus cable losses.

Question 4

What is the relationship between antenna gain and beamwidth?

Accepted Answer

Higher gain produces a narrower beamwidth

Answer

As antenna gain increases, the radiated energy is concentrated into a narrower beam, resulting in a smaller beamwidth in exchange for greater directional power.

Question 5

Which antenna type is most appropriate for a long-distance point-to-point outdoor wireless bridge?

Accepted Answer

Parabolic dish antenna

Answer

A parabolic dish antenna provides very high gain and an extremely narrow beamwidth, making it ideal for focusing signal energy over long point-to-point distances.

(CWS) Certified Wireless Specialist Practice Test

(CWS) Certified Wireless Specialist Practice Test

CWS Antenna Theory & Types