Vivaldi antenna is a kind of slot-line UWB antennas,which is a high-gain and linearly polarized antenna.Theoretically,it has a very wide frequency band.And its gain keeps constant with frequency changed.This paper starts from a single balanced Vivaldi antenna element,designs and analyzes a balanced vivaldi array.Then this array is used as the feed of a paraboloid antenna to get more than 35dB power gain.This kind of paraboloid antennas is widely used in the realm of long distance communications and high resolving radars.Introduction
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