The effect of source pulse shape on the energy and correlation patterns of uwb antennas

Three useful indicators of time domain and ultra-widehand antenna performance are the energy gain, the correlated energy gain, and the correlation coeflicient. The energy gain indicates how much of the energy incident on the antenna??s input port is radiated, the correlated energy gain gives an indication of how much of the incident energy is radiated in a form correlating with a particular template function, and the correlation coeffirient indicates how much the pulse distortion due to an antenna vanes with direction and is important because, even with adaptive equalization, it is not possible to simultaneously correct for direction-dependent distortion dynamically. We examine the effect of input pulse shape on the energy and correlation patterns of P typical broadband antenna suitable for use with UWB communication systems, a hiconical dipole. For a given antenna these patterns depend on both the input pulse shape and the source impedance. We present results for different input pulse shapes including baseband Gaussian pulses and N-cycle sinusoids with Gaussian envelopes. Because the spectral content of each pulse is different, the energy, correlated energy and correlation coeflieient patterns are unique for each pulse shape.