| 摘要 |
The invention pertains to an antenna construction of at least two frequency bands comprising at least a whip antenna. A dielectric block (33) with a relatively high permittivity is installed into the whip antenna (32) at a location in which there is a voltage maximum at a harmonic of the basic resonance frequency of the antenna. The dielectric medium shifts the harmonic in question downwards. The arrangement is realized in such a manner that the basic resonance frequency of the whip antenna falls on the operating frequency band of one network, and the harmonic in question falls on the operating frequency band of a desired second network. The construction may further comprise a PIFA antenna (34) the operating frequency of which is the same as the upper operating frequency of the whip antenna. Thus the degradation of the function of the PIFA that can be caused by the user's hand will not substantially degrade the connection since the whip, too, operates in the operating frequency band of the PIFA. <IMAGE> <IMAGE> |
