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1 | | The magnetron is a combination of a simple diode vacuum tube with built-in cavity and an extremely powerful permanent magnet. |
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2 | | One of the most versatile microwave RF amplifiers is the traveling-wave tube, which can generate thousands of watts of microwave power. |
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3 | | Gyrotrons, which are built and operated as klystrons, are used for amplification at microwave frequencies above GHz into the millimeter range. |
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4 | | A large antenna power loss caused by a(n) can be offset by flaring the end of a waveguide creating a horn antenna. |
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5 | | Most large earth-station use a Cassegrain feed arrangement. |
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6 | | The directivity of an antenna is measured in terms of beam . |
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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. |
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8 | | With the helical antenna, the electromagnetic field is caused to rotate producing what is known as polarization. |
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9 | | antennas are widely used on high-speed aircraft because they can be integrated into the metallic skin of the plane. |
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10 | | A phased array is an antenna system made up of a large group of similar antennas on a(n) plane. |
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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. |
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12 | | In the medical industry, microwave technology is used in machines that used to heat muscles and tissues without causing skin damage. |
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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. |
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14 | | Although they do not have to be visible, objects must be within line-of-sight radio distance in order for detection to occur. |
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15 | | Police radar units use continuous-wave radar for measuring the speed of vehicles. |
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