Control of horizontal radiation pattern of base station antenna for cellular mobile communications by performing approach arrangement of slender metal conductors

Abstract

AbstractIn the IMT‐2000 system, in which the subscriber capacity is increased by using the same frequency repeatedly, it is known that the base station antenna becomes more effective if its beam width in the horizontal plane is narrower than the sector division angle. In order to narrow the beam width of the wireless zone antenna designed with the beam width in the horizontal plane identical to the sector division angle, the antenna elements must be replaced. Replacement of the antenna causes interruption of service and is economically unfavorable. In order to solve these problems, this paper proposes an antenna configuration for reducing the beam width by placing metal conductors near the antenna which is used generally. An analysis using the method of moments is employed to find the relationship of the metal conductor to the beam width when metal conductors are placed close to the antenna in the base station. The effect of the metal conductor on the impedance is also explained by measurement. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 88(4): 20–31, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20178