ATE93093T1 - DIPOLE ANTENNA WALL FOR SHORT WAVE RADIATION. - Google Patents

Abstract

The invention relates to a dipole curtain antenna for radiating short-waves, in which the dipoles are arranged in columns and rows. Dipole curtain antennas are known. They consist of horizontally polarised dipoles which are arranged in a vertical plane, to be precise in columns and rows. They are used for producing short-wave radio links with the aid of the ionosphere. The requirement exists to supply different destination areas in successive periods of time with one antenna, or to reach the same destination area when the ionosphere is at different heights. This necessitates a change to the vertical polar diagram and, since the number of dipoles determines the type of directivity of the polar diagram, it is intended to create a dipole curtain antenna (e.g. a 4/6) with a high number of dipoles in which it is intended that different operating modes should be possible, e.g. 2/2, 2/4 or 4/4, without the polar diagram having been distorted. It is also intended to be possible to change the polarity of some dipoles. According to the invention, the dipole curtain is constructed of individual dipole modules, each dipole module consisting of two horizontal and/or two vertical dipoles and the vertical interval in each case between adjacent dipoles being less than lambda /2 inside the module and greater than lambda /2 outside the module, and the horizontal interval from dipole centre to dipole centre (centre interval) in each case between adjacent dipoles being equal to lambda /2 inside the module and greater than lambda /2 outside the module, the vertical interval between adjacent dipoles preferably being approximately 0.4 lambda inside the module and approximately 0.6 lambda outside the module, and the centre interval between adjacent dipoles outside the module being 1.2 lambda . A dipole curtain antenna for the radiation of short-waves, in which the dipoles are arranged in columns and rows. <IMAGE>