| 摘要 |
An electronic device, such as a mobile radiotelephone, includes a dual antenna structure with a selectively actuatable phase shifter disposed therebetween. When the selectively actuatable phase shifter is selected, signals received by the first and second antennas are substantially out of phase. When the selectively actuatable phase shifter is not selected, signals received by the first and second antennas are substantially in phase. The dual antennas are coupled to a first electrical circuit disposed in a first section of the device. A second electrical circuit is disposed within a second section of the device. An impedance element, for example an inductor, couples the first and second electrical circuits and is disposed in a substantially symmetric location between the first and second electrical circuits. Working in combination, when the selectively actuatable phase shifter is selected, an antenna pattern of the device becomes substantially azimuthal with a null at a top central location. When the selectively actuatable phase shifter is not selected, the antenna pattern becomes substantially uniform with a zenith atop the upper lobe.
|
