Antenna Basics Quiz

An antenna, in addition to radiating or receiving energy, is also used to ____ energy in some directions and suppress in others.

• Dissipate

• Generate noise

• accentuate

A radiator having equal radiation in all directions is referred to as a:

• directional radiator

• isotropic radiator

• guided radiator

If charge is moving with constant velocity, radiation can be created by ___ .

• smooth wires

• bent wires

• infinite length wires

The range of frequencies within which the performance of an antenna, with respect to some characteristic, conforms to a specific standard is referred to as _

• bandwidth

• beamwidth

• loop

The minimum radial distance to the far field region for an antenna of maximum length of D is equal to:

• D^2/lambda

• 2*D^2/lambda

• 4*d^2/lambda

The radiation lobe containing the direction of maximum radiation is referred to as the:

• minor

• Major

• black

The normalized power pattern of antenna is represented as U(휃)=sin (휃) . Then HPBW of antenna is equal to:

• 30

• 60

• 120

• 180

The ratio of the radiation intensity in a given direction from the antenna to the radiation intensity averaged over all directions is defined as the:

• Beamwidth
• Radiation efficiency
• Antenna gain
• Directivity

The maximum directivity (dimensionless) of elementary electric dipole with uniform current distribution is:

• 1.5

• 4

• 1.64

The total maximum directivity is also defined as Do = 4*Pi/WA where WA is referred to as the:

• Beam efficiency

• Radiation efficiency