Antennas Flashcards
1
Q
Parabolic Antenna
A
Used in old weather radars
Reflect all radiation from focal point outwards in same direction
- side lobes (incorrect responses on radar screen)
2
Q
Slotted Planar Array/Flat Plate Antenna/Phased Array
A
Slots cut in to produce similar beam to parabolic antenna with smaller sidelobes.
+ Less unwanted returns and energy waste (less energy required)
+ Beams can be made thinner for less energy use/increased range (Not considerably)
3
Q
Measurement of wavelengths (metric etc)
A
ADF - Hecto/Kilometric
VHF/Marker Beacon - Metric
DME - Decimetric
