A Ku-band active transmit-array module with a horn or patch array as a signal launching/receiving device

This paper is concerned with the design of a Ku-band active transmit-array module of transistor amplifiers excited by either a pyramidal horn or a pat ch array Optimal distances between the active transmit array and the signal -launching:receiving device, which is either a passive corporate-fed array or a horn, are determined to maximise the power gain at a design frequency: Having established these conditions, the complete structure is investigate d in terms of operational bandwidth and near-field and far-held distributio ns measured at the output side of the transmit array, The experimental resu lts show that the use of a corporate-fed array as an illuminating/receiving device gives higher gain and significantly larger operational bandwidth, A n explanation for this behavior is sought.