公开(公告)号：US20010024959A1

公开(公告)日：2001-09-27

申请号：US09805482

申请日：2001-03-13

Applicant: U.S. Philips Corporation

Inventor： Kevin R. Boyle ,  Peter J. Massey

IPC: H04M001/00

CPC classification number: H01Q21/29

Abstract: A wireless terminal has an antenna arrangement including one or more antennas (102a, 102b) designed to reduce substantially currents flowing on ground conductors (104a, 104b, 104c) within the device. In known terminals, these currents generate radiation of unwanted polarisations and radiation in unwanted directions, and can also reduce radiation efficiency. The antenna arrangement of the present invention employs antennas (102a, 102b) having an electrical length of slightly more than half a wavelength. The feed currents drawn from the ground conductors (104a, 104b, 104c) are then out of phase with the current flowing on most of the antenna and therefore cancel with induced currents. The total current flowing in the ground conductors (104a, 104b, 104c) is reduced, thereby minimising radiation from these conductors and improving overall radiation characteristics. Further, the input impedance of the antenna (102a, 102b) remains reasonable.

Abstract translation: 无线终端具有包括一个或多个天线（102a，102b）的天线布置，该天线被设计成基本上减少流过设备内的接地导体（104a，104b，104c）的电流。 在已知的端子中，这些电流在不想要的方向上产生不想要的极化和辐射的辐射，并且还可以降低辐射效率。 本发明的天线装置采用电长度略大于波长一半的天线（102a，102b）。 然后，从接地导体（104a，104b，104c）抽出的馈电电流与在大部分天线上流动的电流异相，因此用感应电流消除。 在接地导体（104a，104b，104c）中流动的总电流减小，从而最小化来自这些导体的辐射并改善整个辐射特性。 此外，天线（102a，102b）的输入阻抗保持合理。