 |
1 | |
The magnetron is a combination of a simple diode vacuum tube with built-in cavity and an extremely powerful permanent magnet. |
|
|
2 | |
One of the most versatile microwave RF amplifiers is the traveling-wave tube, which can generate thousands of watts of microwave power. |
|
|
3 | |
Gyrotrons, which are built and operated as klystrons, are used for amplification at microwave frequencies above GHz into the millimeter range. |
|
|
4 | |
A large antenna power loss caused by a(n) can be offset by flaring the end of a waveguide creating a horn antenna. |
|
|
5 | |
Most large earth-station use a Cassegrain feed arrangement. |
|
|
6 | |
The directivity of an antenna is measured in terms of beam . |
|
|
7 | |
A parabolic reflector is a large structure which focuses energy radiated by a horn into a narrow beam and reflects it toward its destination. |
|
|
8 | |
With the helical antenna, the electromagnetic field is caused to rotate producing what is known as polarization. |
|
|
9 | |
antennas are widely used on high-speed aircraft because they can be integrated into the metallic skin of the plane. |
|
|
10 | |
A phased array is an antenna system made up of a large group of similar antennas on a(n) plane. |
|
|
11 | |
antennas that automatically adjust their characteristics to the environment, use techniques to zero in on signals to be received and to ensure transmission under noisy conditions. |
|
|
12 | |
In the medical industry, microwave technology is used in machines that used to heat muscles and tissues without causing skin damage. |
|
|
13 | |
The electronic communication system known as , based on the principle that high-frequency RF signals are reflected by conductive targets is used with targets that include airplanes, ships, missiles, and automobiles. |
|
|
14 | |
Although they do not have to be visible, objects must be within line-of-sight radio distance in order for detection to occur. |
|
|
15 | |
Police radar units use continuous-wave radar for measuring the speed of vehicles. |
|
.