Analysis and measurement of the `Hartley effect´ in HF curtain arrays

This paper describes a method for predicting the operating performance of an array (input match, power split between the stacks and the voltages on components) based on a 4-port S-parameter measurement and on a model of the array´s bay feeder network. The measured S-parameters are converted to an admittance matrix (Y-parameters) and used to terminate an equivalent circuit of the array´s bay feeder. The resulting network is analysed using a method based on chain matrices. The correlation between measurement and prediction of the arrays performance in the straight ahead condition, and at small slew angles is good. However, this deteriorates as the angle of the slew is increased. The model is based on a balanced network and it is thought the errors between measurement and prediction, at large slew angles, can be attributed to unbalanced currents in the array