| 摘要 |
An antenna device is adapted for use in at least two frequency bands, wherein the mean wave length of the higher of said frequency bands isλ. The antenna device comprises an antenna element in the form of a reed (10) mounted on a conductive support structure (20) having a projected area of less thanλ<2>. The reed comprises a feeding portion (12) connectable to a feed device (32) and at least one impedance is connected between the reed and the conductive support. Also, the phase difference of transmitted and/or received signal waves within said at least two frequency bands over the reed is less than 120 DEG in order to increase radiation con-ductance. A multi-band antenna device with a relatively wide upper frequency band is thereby provided. |
