| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna of small size which requires no precise manufacturing, as an antenna having a wide frequency band, from FM band to UHF band. <P>SOLUTION: A cobra antenna includes a relay part 3A constituting a power feeding point Fp, an antenna element 2A of a plate-like conductor 11, being electrically connected to one terminal of the relay part 3A, which has an area capable of providing a length of λ/4 as a path through which a current generated by reception of radiowaves flows to one terminal of the relay part 3A, with the wavelength of the radiowave assumed to be λ, a coaxial line 5 whose one end is electrically connected to the other terminal of the relay part 3A, and a ferrite core 4 which is provided at a position away from the other terminal of the relay part 3A to which one end of the coaxial line 5 is connected by the length almost 1/4 of the wavelength of the radiowave, being penetrated or wound by the coaxial line 5. <P>COPYRIGHT: (C)2012,JPO&INPIT |
