專利摘要：
A phase value is calculated to produce a pre-determined beam direction S02, and sent to a phase control circuit, which adjusts the direction of radiation emitted from the antenna S03. The antenna emission is measured S04 to determine a beam angle value, corresponding to the beam direction. The beam angle value is compared to the phase value, to determine if any difference is outside a permitted error range S05. If so, the beam angle is corrected S06 by adding the difference to the phase value, before being sent to the phase control circuit to re- adjust the beam angle S03. The procedure repeats until the difference is within the error range, reducing temperature dependent errors. A genetic algorithm may be used as an optimisation technique to calculate phase value. The antenna may be a base station or an array antenna. The phase control circuit may be an electronic phase shifter.