Method for determining an antenna array capable of generating an electromagnetic wave (Ototal), the array comprising: - at least one antenna (16, 18), - at least one circuit (19, 20, 22) having parameters (Z, Z1, Z2) having an influence on the electromagnetic wave (Ototal) generated by the antenna array and connected to at least one antenna (16, 18), the circuit being a coupling circuit based on a waveguide, the parameters having an influence on the electromagnetic wave (Ototal) generated by the antenna array, being the parameters characterizing the impedance of the waveguide, the length of the guide and the impedance of an associated load with the coupling circuit or the circuit (19, 20, 22) is at least one load (20, 22), the parameters (Z1, Z2) having an influence on the electromagnetic wave (Ototal) generated by the antenna array, being the value of the impedance of each load (20, 22), the parameters being determined by a method comprising the steps for: - selecting a criterion to be met for the wave (Ototal) generated by the antenna array, the criterion is selected from a group consisting of the following elements: - the directivity of the antenna array in a given direction, - the ratio of the front/back return of the antenna array, - the radiation diagram of the array is substantially identical with a radiation diagram obtained with a specific mask, and - the radiation diagram of the array in a perturbed environment is identical with a desired radiation diagram, characterized in that the method comprises the additional steps of: - determining desired decomposition coefficients of a wave in a basis giving the possibility of attaining the selected criterion, - calculating the parameters (Z, Z1, Z2) having an influence on the electromagnetic wave (Ototal) generated by the antenna array for each circuit (19, 20, 22) of the antenna array so that the difference between the decomposition coefficients on the basis of the wave generated by the antenna array and the desired decomposition coefficients be minimal, and - configuring the antenna array with the calculated parameters (Z, Z1, Z2). - at least one antenna (16, 18), - at least one circuit (19, 20, 22) having parameters (Z, Z1, Z2) having an influence on the electromagnetic wave (Ototal) generated by the antenna array and connected to at least one antenna (16, 18), - selecting a criterion to be met for the wave (Ototal) generated by the antenna array, the criterion is selected from a group consisting of the following elements: - the directivity of the antenna array in a given direction, - the ratio of the front/back return of the antenna array, - the radiation diagram of the array is substantially identical with a radiation diagram obtained with a specific mask, and - the radiation diagram of the array in a perturbed environment is identical with a desired radiation diagram, - the directivity of the antenna array in a given direction, - the ratio of the front/back return of the antenna array, - the radiation diagram of the array is substantially identical with a radiation diagram obtained with a specific mask, and - the radiation diagram of the array in a perturbed environment is identical with a desired radiation diagram, - determining desired decomposition coefficients of a wave in a basis giving the possibility of attaining the selected criterion, - calculating the parameters (Z, Z1, Z2) having an influence on the electromagnetic wave (Ototal) generated by the antenna array for each circuit (19, 20, 22) of the antenna array so that the difference between the decomposition coefficients on the basis of the wave generated by the antenna array and the desired decomposition coefficients be minimal, and - configuring the antenna array with the calculated parameters (Z, Z1, Z2).