The detection of human body worn concealed weapons based on the late time resonance (LTR) method is a considerable challenge. Successful LTR extraction to identify the target signature and its correct interpretation requires UWB antenna, which can cover the frequency of the fundamental (lowest) complex natural resonance (CNR) of the target(s) under detection. A flat gain UWB tapered slot antenna with operating bandwidth of 0.25-3 GHz to cover the lowest CNR frequencies was designed and fabricated. Antenna tests made in an anechoic chamber provide complete back scattering and signal radiation data. The results showed that the fabricated antenna has relative flat gain from about 0.3 GHz to just over 3 GHz with distortion less narrow pulse transmission.
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