The objective of this study is to demonstrate one-dimensional steerability of a linear array of TEM horn antennas, using the true-time delay approach. Three TEM horns have been fabricated and tested in an array configuration. Initially, the boresight radiation of a single TEM horn is measured at low-voltages, and seen to be in agreement with theoretical models. To demonstrate the linearity, limited measurements were also performed using a 300 kV pulser with a single antenna completely immersed in oil. In a linear array configuration, the three TEM horns can be excited simultaneously or in some prescribed time sequence. Controlling the time sequence of excitation of the individual elements, the radiated beam can be configured to have its peak on boresight or at some angle in the azimuth. Although fixed time delays were introduced in this experiment, future transient arrays are expected to be excited with triggered switches developed in this effort and described in a separate report.
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