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八木天线[Yagi Antenna] [2005-10-30]
iamet 发表在 Ω〖物理〗
| The Yagi antenna is named after Dr. H. Yagi, a Japanese physicist who translated into English an antenna design based on a parallel array of dipole antennas. (However, it is said that the actual design of the antenna was invented by a professor Uda.) The design involves placing a slightly longer dipole behind, and a slightly shorter dipole in front of, the driven dipole to direct the radiation in the direction of the longer-to-shorter elements.
Today, Yagi antennas usually have several of the shorter ("director") elements and one of the longer ("reflector") elements separated by a small fraction of the wavelength of the driven element (about 1/10). Being a resonant dipole, the driven element has a length of one-half the wavelength being used.
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