Optimisation of a dual-band printed antenna for cellular base stations using a marginal distribution technique

A new statistical optimisation technique is presented and applied to the synthesis of a cellular base station antenna as an illustration of its potential. The algorithm is able to successfully specify an array that will meet the radiation pattern requirements in the GSM900 (880-960 MHz) and DCS1800 (1710-1880 MHz) bands of the GSM cellular telephone network. The basic design to be optimised is an eleven element co-linear printed wire dipole array. It is possible to broaden the scope of the optimisation process, at the expense of processing time, to include varying element lengths and substrate thickness for example, which may help with the impedance matching. Also, the moment method code can be extended to model patches, which will allow the design of integrated feed networks