Evaluation of degradation of shaped radiation pattern caused by excitation coefficient error for onboard array-fed reflector antenna

We evaluated the degradation of the radiation pattern caused by the excitation coefficient error of the phased array-fed reflector antenna. In the case of the excitation coefficient quantized and with the error added in accordance with the manufacturing specifications, for example, 99.9 % of the gain of the nationwide beams is more than 40 dBi and 99.99 % of the gain of the nationwide beams is more than 39.5 dBi. The calculation method with power restriction is thus not only efficient, but the performance is nearly equal to the calculation method without power restriction.