Abstract A procedure is presented for positioning the various elements of a phased array antenna system preserving the “equal path length” characteristic. This antenna system consists of one horn illuminating a planar array (which is space-fed), each element of which is connected through an amplifier to the corresponding element of a radiating planar array. The objective is to make the total path length from the horn to any element of the radiating array via the respective points just described the same for all such elements. This is a desirable feature for making the system broad-band. An example is given and a corresponding model having the equal path length characteristic is built.