| 摘要 |
An antenna arrangement for a radio communications apparatus such as a mobile phone, comprises a substantially planar patch conductor ( 14 ) having a first feed connection point ( 18 ) for connection to radio circuitry and a second feed connection point ( 20 ) for connection to a ground plane, a first, differential slot ( 22 ) in the patch conductor between the first and second connection points and a second, dual band slot ( 24 ) located in the patch conductor outside the area between the first and second connection points, wherein the length of the first slot ( 22 ) is greater than a quarter wavelength, for example a half wavelength, and provides a third resonant frequency increasing the bandwidth of the antenna. The width (A) of the patch conductor between the first and the second slots is selected to obtain a low impedance transformation and thereby a low antenna resistance causing detuning the antenna. A user holding the phone increases the antenna resistance and insodoing tunes the antenna.
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