PC2: Antenna Principles Flashcards
A transducer, which converts electrical power into electromagnetic waves and vice versa
Antenna
Represent the emission or reception of wave front at the antenna, specifying its strength
Radiation Patterns
What are the 2 radiation patterns?
- Omnidirectional
- Directional
Identify Directional
Most Power
Main Beam (Lobe)
Identify Directional
Measures angular width of main beam
Half Power Beamwidth (HPBW)
Identify Directional
Carry same information as main beam with much lower power
Side Lobes
Determines the frequencies it can handle and how it radiates EM waves
Antenna’s Size and Shape
The ratio of the effective radiating area (or effect area) to the physical area of the aperture
Aperture Efficiency
The ratio of the radiation intensity in a given direction to the radiation intensity that would be obtained if the power accepted by the antenna were radiated isotropically
Gain
Radiation from a point source, radiating uniformly in all directions, with same intensity regardless of the direction of measurement
Isotropic Radiation
Transmit radiation in a particular direction
Antenna’s Directivity
True or False
The bigger antenna will generate more gain
True
Same sized antennas will have more gain with what?
shorter wavelengths/higher frequencies
What kind of wavelength requires larger antennas?
Longer
True or False
Shorter wavelengths can use smaller antennas and still achieve higher gain
True
