Antenna Theory & Types Flashcards
7 cards from real CWS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Antenna Theory & Types flashcards as text
What is the standard unit used to express antenna gain relative to an isotropic radiator?
Answer: dBi
dBi (decibels relative to isotropic) expresses gain compared to a theoretical isotropic antenna that radiates equally in all directions.
Which antenna type radiates power equally in all horizontal directions, making it ideal for general indoor WLAN coverage?
Answer: Omnidirectional dipole antenna
An omnidirectional dipole antenna provides a 360-degree horizontal radiation pattern, making it well-suited for broad indoor WLAN coverage from a central location.
What does the acronym EIRP stand for in the context of wireless networking?
Answer: Effective Isotropic Radiated Power
EIRP (Effective Isotropic Radiated Power) represents the total power radiated by an antenna system, combining transmit power and antenna gain minus cable losses.
What is the relationship between antenna gain and beamwidth?
Answer: Higher gain produces a narrower beamwidth
As antenna gain increases, the radiated energy is concentrated into a narrower beam, resulting in a smaller beamwidth in exchange for greater directional power.
Which antenna type is most appropriate for a long-distance point-to-point outdoor wireless bridge?
Answer: Parabolic dish antenna
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.
What is antenna diversity in a WLAN system?
Answer: Using multiple antennas and selecting the one receiving the strongest signal to improve reliability
Antenna diversity uses two or more antennas at a receiver and dynamically selects the antenna with the best signal, reducing the effects of multipath fading.
What polarization orientation do most indoor WLAN access point antennas use by default?
Answer: Vertical polarization
Most indoor WLAN access point antennas use vertical polarization because the antennas are typically mounted upright and vertical polarization minimizes ground reflection losses.