Analysis and Design of Time-domain TEM Horn Antenna

TEM Horn is an uItra-wide-band antenna,which is usuaIIy empIoyed in the anaIysis of freguency domain up to the present . A new concept is presented with wave mode theory . According to this concept ,the impedance of antenna aperture cannot be regarded as the wave impedance in vacuum,but is connected with antenna size and fIare angIe . Because of the time seguence,the refIection is onIy connected with IocaI structure . A TEM horn antenna is designed and fabricated . The experiment resuIts show that its wave fideIity and impedance performance are exceIIent ,so it is very vaIuabIe for the study of time-domain antenna .