| 摘要 |
<p>1,079,048. Aerials. G. S. GUSTAFSON. Oct. 2, 1964 [Oct. 4, 1963], No. 40187/64. Heading H4A. An aerial consists of at least two co-planar rectangular loops, the longer sides of which are all parallel and are, for the most part, enclosed in tubes of ferromagnetic material. As described, a single conductor is wound anticlockwise to form one loop with sides 13, 14, 15, 16 and then clockwise to form another loop with sides 17, 18, 19, 20, the long sides 13 and 17 of the two loops being adjacent. Ferrite tubes 22, 23, 24 enclose one long side 15 of one loop and the two long sides 17, 19 of the other. The ends of the conductor 10 are taken to terminals 11, 12. A plastics sheath 25 encloses the aerial and comprises a central tube from which tubular portions branch off for containing the outer portions of the loops. The sides of the loops, and the ferrite tubes, may be secured in the various tubular portions of the sheath. The inner conductor and the sheath of a coaxial cable 25 may be connected to the terminals 11, 12 or only the inner conductor may be connected to one or both of the terminals, the sheath being connected to it through a matching resistor (Figs. 2 and 3, not shown). It is stated that the aerial will receive signals satisfactorily over a broad band of frequencies, such as from 50 to 200mc/s., and that it exhibits directivity which may be utilized for weak signals.</p> |
