Antennas & Waveguides Flashcards
1
Q
How does the gain of a parabolic dish antenna change when the operating frequency is doubled?
A
Gain increases 6 dB.
2
Q
What type of antenna or pickup device is used to extract the RADAR signal from the wave guide?
A
J-hook.
3
Q
What happens to the beamwidth of an antenna as the gain is increased? The beamwidth:
A
Decreases as the gain is increased.
4
Q
A common shipboard RADAR antenna is the:
A
Slotted array.
5
Q
Conductance takes place in a waveguide:
A
Through electromagnetic and electrostatic fields in the walls of the waveguide.
6
Q
To couple energy into and out of a waveguide use:
A
A thin piece of wire as an antenna.
