Patent ID: 9711849
Date: 2017-07-18
CPC Classifications: H01Q

Claim:
1. An antenna reconfigurable circuit, disposed in a multiple-antenna system with a plurality of antennas and adapted to change patterns of the antennas, the antenna reconfigurable circuit comprising: a feed portion which a radio frequency (RF) signal is fed to; power distribution lines, coupled between the feed portion and the plurality of antennas to form therebetween paths of transmission of the RF signal, and the power distribution lines comprising a first power distribution line, a second power distribution line, a third power distribution line, and a fourth power distribution line, wherein each of the power distribution lines has an end coupled to a corresponding one of the plurality of antennas and has another end coupled to the feed portion; and switching units, disposed on the power distribution lines, respectively, to selectively disable or enable the paths so as to turn off or on the plurality of antennas selectively, and comprising a first switching unit, a second switching unit, a third switching unit, and a fourth switching unit, wherein each of the switching units lies between a corresponding one of the power distribution lines and the feed portion; wherein the power distribution lines each comprises a ground line, perpendicular to a corresponding path of transmission of the RF signal of the power distribution line, and with an electrical length which is n times one-fourth of a wavelength corresponding to a resonance frequency of the antenna coupled to the power distribution line, where n denotes a positive integer; wherein, when the first switching unit is turned on, the first power distribution line forms a first path of transmission of the RF signal to a first antenna of the plurality of antennas; when the second switching unit is turned on, the second power distribution line forms a second path of transmission of the RF signal to a second antenna of the plurality of antennas; when the third switching unit is turned on, the third power distribution line forms a third path of transmission of the RF signal to a third antenna of the plurality of antennas; when the fourth switching unit is turned on, the fourth power distribution line forms a fourth path of transmission of the RF signal to a fourth antenna of the plurality of antennas.