| Impulse radar, also known as non-career radar and video pulse radar, is a branch or a special case of the Ultra Wide Band (UWB) radar. Since the pulse generated by the impulse radar has a wide spectrum, a plenty of low and high frequency componenets, the impulse radar can detect and identify the concealed targets in the environments such as forest, snow, sand, and so on while balancing the indicator of the detecting range and the resolution. Just because the sharp pulse has widely instantaneous bandwidth, the transmitting and receiving antenna of this radar has to be different from the ordinary ones which work in the conventional frequency domain.The main works of this dissertation are to design and optimize the antennae fit the requirements of the impulse radar system, according to the especial demand of the impulse Radar detecting the concealed target.The main contents and innovations of the dissertation are summarized as following:(1) The method how to assess time domain Vivaldi antenna design is proposed, which is based on the analysis and the summary of the Vivaldi antenna's traditional design method. two kinds of the Vivaldi antennae with six species are designed, and their performances in the time domain are analyzed and evaluated combined with the needs of impulse radar;(2) A new parameter used in the time domain is defined, which is considered with the impact on the impulse radar. This new parameter has established the fundation of the design and the assessment for the time domain antenna;(3) A new model of Vivaldi antenna using resistor-loaded is proposed. That new model could strongly support the experiment aiming to detecting the concealed targets while inhibiting the pulse tail efficiently;(4) Several significative results and conclusions were proposed by the way of carrying out forward-looking imaging experiments based on the electromagnetic time revesal mirror arithmetic, while using Vivaldi antenna designed in this dissertation. |
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