feed horn造句

• A cantenna can be used as a satellite dish feed horn.
• As the feed horn is fixed in nutated feeds, no polarization changes occur.
• Therefore, the feed horn must be longer for a given wavelength.
• The feed horn consisted of a cross dipole antenna design for both A and B channels.
• In satellite antennas, scalar rings are used to push the spread signal into the feed horn.
• Multiple feed horns were used in the receiver to allow reception from many vertical angles at once.
• Unless the feed horn fell off.
• The offset support arm houses a retractable prime focus feed horn in front of the 8 m Gregorian focus.
• A nutated feed offsets the antenna at an angle to a fixed feed horn, and then rotates the antenna.
• The BUC is also connected to the feed horn through a wave guide port of the OMT junction device.
• Combined with a linearly polarized feed horn, it helps filter out noise in the receiver and reduces false returns.
• Radar became small enough to be carried on board aircraft, but the fragile feed horns and vacuum formed to shape.
• Each module has one transmit-receive feed horn and one auxiliary receive feed horn for a second polarization, totaling 44, 000 feedhorns.
• Each module has one transmit-receive feed horn and one auxiliary receive feed horn for a second polarization, totaling 44, 000 feedhorns.
• However, conical scanning could only easily be used on an antenna with a single feed horn, which is only practical with microwave radars.
• Most often this is used close to an antenna feed horn in order to allow transmit and receive signals to operate on separate polarizations.
• The antenna was fed signals from several feed horns arranged in a vertical stack, producing a series of horizontal beams separated vertically in space.
• In satellite dishes, part of the receiver electronics, the " RF front end ", is usually mounted in a box just behind the feed horn.
• As its name suggests, a feed horn is set just off the parabolic focal point which causes the energy to focus slightly off the antenna midline.
• The angular width the secondary reflector subtends at the feed horn is typically 10?15? as opposed to 120?180?the main reflector subtends in a front-fed dish.