Influence of the mutual coupling between the element of TEM horn arrays on far-field radiation

This paper analyzes transient radiation of transverse electronmagnetic(TEM) horn antenna arrays with FETD method. Influence of the mutual coupling between the elements on far-field radiation is analyzed. The radiation performance at lower frequencies can be improved using the stacked TEM-horn configuration and decreased using rain gutter and square plane TEM-horn configuration. Rain gutter and stacked two-element of half TEM-horn arrays and four-element of half TEM-horn arrays were investigated by simulation and experiments. Experiments of TEM-horn array verified the result of the FDTD simulations．