Wang Xianghui,Jiang Yansheng,Wang Wenbing
(Institute of Microwave and Optical Communication,Xi'an Jiaotong University,Xi'an ¡¡710049,China)
Abstract:In order to investigate the transient radiated characteristics of the ultra-wide-band £¨UWB£© aperture antennas in time-domain,the finite-difference timeª²domain numerical method was used to calculate the aperture field under the condition that the plane waves had front,slanting, and cylindrical waves project on the aperture with various size and shape,and then the radiation field of the aperture could be obtained. The conventional antenna pattern was extended to the space-time pattern which can be used in UWB antennas,then the relationship between the radiated waveform in E-plane and H-plane and the impulse duration in free space and the aperture shape and size could be described by the space-time pattern in different exciting conditions. In the end, a conclusion that the aperture radiated characteristics could be changed through varying the aperture size and the shape was reached. The research provided a theoretical basis for understanding the transient radiated characteristics of aperture antennas and helping engineers to design this type of antennas.
Keywords:ultra-wideband antenna;aperture;space-time pattern;finite-difference time-domain