Surge damage as a result of long cables connected to low voltage data systems can be prevented
RICHARD MEININGER & ROBERT BLOUCH
Since their first introduction in 1994 at the Roma International Symposium on EMC, bicon/log hybrid antennas have become very popular in EMC labs worldwide. Because there are no band breaks in frequency sweep, test time and effort are reduced. EMC engineers have assumed that performance of these antennas is simply that of a biconical antenna at a lower frequency range until it transitions to a regular log periodic dipole array (LPDA) antenna at higher frequencies. Questions have been raised about this assumption, and some have suggested that a higher measurement uncertainty (U) should be used due to the characterization of the phase center position and antenna pattern variation from that of a dipole on which emission and site validation standards are based. Very limited research has been conducted on the uncertainty evaluation of these hybrid antennas, despite the fact that more and more EMC engineers have come to realize that predicting and reducing measurement uncertainty has become an important aspect of EMC testing.Click the pdf below to read the full article.