| 摘要 |
PURPOSE:To obtain a transmission/reception function similar to that of a rod antenna by deciding the diameter of upper ridge of an inverse conical metallic plate, a tilt angle of a sloped circumferential face of said metallic plate to the ridge diameter and the diameter of a disc part or the like in relation to a wavelength of a tansmission/reception signal. CONSTITUTION:A tilt angle of a tilt plate 22b to the disc part 22a is taken as alpha, a tilt angle of a tilt circumferential face of the inverse conical metallic plate 25 to the upper ridge diameter is taken as beta, diameters of the disc 22a, the lower ridge of the tilt plate 22b and the upper ridge of the inverse conical metallic plate 25 are taken respectively as D1, D2 and D3, and the shaft height of an auxiliary rod 24 and the height of the center part of the inverse conical metallic plate 25 from the disc part 22a taken as H1 and H2 respectively. The characteristic of the antenna similar to or over that of a rod antenna is displayed by deciding the dimensions above in the relation to the wavelength lambda of the transmission/reception signal. |
