| 摘要 |
PURPOSE:To redcue a multipath noise and also make the whole antenna part small- sized, by coupling at least two loop antnna elements at the electrical neutral point, and coupling a rod antenna element between the coupling points of said antenna elements. CONSTITUTION:This equipment is constituted of a composite antenna part 1, a base part 2 for supporting the composite antenna part 1, a base which supports this base part 2 and can be fixed onto the roof, etc. of a car freely attachably and detachably, and a cable 4 for electrically connecting the internal circuit of th base part 2 to the cab equipment. The composite antenna part 1 consists of loop antennas 1a, 1b which have been combined so that the peak directions of distribution of directional patterns become orthogonal to each other, coupling members 1d, 1e existing at the electrical neutral points of the antennas 1a, 1b, and a rod antenna 1c extending between the coupling members 1d, 1e. |
