An exponentially tapered and folded wideband TEM horn array is proposed to reduce the overall dimension of the array. The proposed antenna can handle a 20 kV of the impulse input signal. The radiating elements are folded twice parallel to the direction of electric field to reduce the overall dimension of the exponentially tapered TEM horn array. A 20 kV of the impulse input signal is divided into the 1 x 16 exponentially tapered TEM horn elements. The divider has the microstrip structure and is designed by using a triangularly taper transformer. To avoid the breakdown due to the high voltage of the 20 kV, the distance between metallic objects (feed points, microstrip lines, and ground plane) is determined to be more than 7 mm: the distances between the feed points and between the microstrip line and the ground plane are 10 mm and 15 mm, respectively. The overall dimension of the proposed array antenna is 2700 × 1900 × 1100 mm~3 and its impedance bandwidth (VSWR ＜ 2) is 845 MHz (120 ～ 965 MHz). The proposed antenna is analyzed by CST (MWS), and its performance is measured and discussed.
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