| 摘要 |
A slot-fed Yagi aerial includes: a cable, a reflector, an active dipole and directors, wherein, the reflector, the active dipole, etc. are provided on a support tube; the feeding section of the Yagi aerial is of a shielded slot structure in which the distance between the ends of the slot is approximately one half of the wavelength of the electromagnetic signal desired to be received; the two pieces of thin metal rods composing the half wavelength dipole are located at two external sides of the slot; the outer conductor of the cable is connected to one side of the slot, and the inner conductor of the cable is connected to the other side of the slot or the inner conductor of the cable isolated by a dielectric layer is wound around at the other side of the slot, so as to realize a direct connection feed or a coupling feed. The slot-fed Yagi aerial employs a half wavelength dipole composed of two pieces of thin metal rods, and its feeding section is of a shielded slot structure, and its feeding is realized by the slot. After simulation test and examination, the Yagi aerial according to the present invention can provide a better gain and front-to-rear ratio over a folded dipole in the case that they have same size, so that the production cost is saved and the occupation space of the aerial is reduced while the gain and the front-to-rear ratio is maintained.
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