Patent ID: 6144344
Filing Date: 2000-11-07
Classification: H01Q

Abstract:
An antenna apparatus for a base station, comprising:a printed circuit board (PCB) having a power divider pattern including power divider terminals disposed on one side of said PCB;a conducting ground plate having a plurality of apertures disposed in line as radiation elements respectively and electromagnetically coupled with each of said power divider terminals of the PCB, wherein said apertures are separated from each other by a distance ""d"" defined by d=.lambda..sub.min /(1+sin.epsilon..sub.max), where .lambda..sub.min is a minimal wavelength and sin.epsilon..sub.max is an edge angle of a cosecant zone, and said power divider terminals of the PCB are disposed to terminate within the contour of the apertures and all the power divider terminals are disposed in one line and have a length being a quarter of wavelength;a foamed dielectric sheet, with a predetermined thickness, disposed between the PCB and the conducting ground plate; anda cavity having a rectangular box with one side open and connected by its open side and by its edges to said ground plate so that all the apertures are disposed within a contour of said cavity.