CWDP CWDP Antenna Design and Placement 1 — Questions and Answers
Question 1: Which antenna type radiates energy equally in all horizontal directions, making it ideal for open-office deployments?
- Yagi
- Omnidirectional (Correct answer)
- Patch
- Parabolic
Correct answer: Omnidirectional
Omnidirectional antennas radiate in a 360-degree horizontal pattern, providing even coverage in open areas.
Question 2: What does 'antenna gain' measure in the context of WLAN design?
- Amplification of the transmit power
- Concentration of radiated energy in a specific direction (Correct answer)
- Total power output of the access point
- Signal attenuation across free space
Correct answer: Concentration of radiated energy in a specific direction
Antenna gain measures how much energy is focused in a particular direction compared to a reference antenna.
Question 3: A CWDP designer needs to cover a long narrow hallway. Which antenna type is most appropriate?
- Omnidirectional dipole
- Yagi directional (Correct answer)
- Sector antenna
- Patch array
Correct answer: Yagi directional
A Yagi antenna's narrow, high-gain beam pattern is well-suited for long, narrow spaces like hallways.
Question 4: What is the primary effect of antenna downtilt in a multi-floor building deployment?
- Increases channel width
- Reduces co-channel interference on adjacent floors (Correct answer)
- Boosts EIRP beyond regulatory limits
- Widens the azimuth beamwidth
Correct answer: Reduces co-channel interference on adjacent floors
Downtilting an antenna directs the main lobe toward the intended coverage area, limiting signal bleed to other floors.
Question 5: Which polarization mismatch scenario results in the greatest signal loss?
- Both antennas vertically polarized
- Both antennas horizontally polarized
- One vertical and one horizontal polarization (Correct answer)
- Cross-polarized MIMO antennas
Correct answer: One vertical and one horizontal polarization
A 90-degree polarization mismatch between transmitter and receiver can cause up to 20 dB of signal loss.
Question 6: What does EIRP stand for and what does it represent in WLAN design?
- Effective Isotropic Radiated Power — total power radiated by the antenna system (Correct answer)
- Equivalent Internal Radio Power — power consumed by the radio chipset
- Enhanced Interference Rejection Protocol — a filtering mechanism
- Estimated Interference Reduction Parameter — a planning metric
Correct answer: Effective Isotropic Radiated Power — total power radiated by the antenna system
EIRP is the effective isotropic radiated power, combining transmit power and antenna gain minus cable losses.
CWDP CWDP Antenna Design and Placement 1
Which antenna type radiates energy equally in all horizontal directions, making it ideal for open-office deployments?