04 | Karteikarten

Frage	Antworten
What is azimuth chart	H-Plane Top-down view of the radiation pattern of an antenna
What is the elevation chart	E-Plane Side view of the radiation of an antenna
What is the beamwidth	Measures how broad or narrow the focus of an antenna is
What is an omnidirectional antenna	RF radiates coverage in all directions
What is a semidirectional antenna	RF radiates similar to a wall sconce. Directional across a large area
What is a highly directional antenna	Radiates RF similar to a spotlight focusing light
What are sector antennas	High gain semidirectional antennas Providing coverage in a pie-shape Also known as sectorized array
What is static beamforming	Directional antennas in a fixed radiation pattern
What is dynamic beamforming	Focused RF energy in a specific directional Radiation pattern can change per frame
What is transmit beamforming	Transmits multiple phase-shifted signals Either implicit or explicit Introduced in 802.11n
What is implicit transmit beamforming	Use of implicit channel-sounding process to optimize phase differentials
What is explicit transmit beamforming	Requires feedback from the station to determine amount of phase-shift required for each signal Defined in 802.11ac
What is the fresnel zone	Area surrounding the path of visual line of sight between two point-to-point antennas
First Fresnel zone	Closest ellipsoid
What is Earth bulge	For antennas more than 7 miles away Impedes on Fresnel zone
What is antenna polarization	Alignment of antenna Should be oriented same way as the receiving antenna for strongest signal
What is antenna diversity	Helps compensate for multipath AP w/ two or more antennas to minimize multipath
MIMO	Multiple-Input, Multiple-Output Antenna diversity Takes advantage of multipath
VSWR	Voltage Standing Wave Ratio Measurement of change in impedances to an AC signal

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