A NEW BROADBAND DOUBLE RIDGE GUIDE HORN WITH IMPROVED RADIATION PATTERN FOR ELECTROMAGNETIC COMPATABILITY TESTING

摘要

Broadband antennas are the workhorse of EMC testing. The large frequency band allows testing of equipment without interruptions to change antennas. Until recently the main antenna parameter of interest to the EMC engineer was the antenna factor (AF). EMC engineers were not interested in antenna patterns, most antennas were assumed to have a directive pattern with a smooth main lobe. As testing at higher frequencies has become important, attention to the radiation pattern has become a key issue. Recently a double ridge guide horn (DRGH) design has been found to have a very poor pattern for about half of the band it covers. This traditional design has been accepted in the EMC community as a standard antenna. In the paper a new design of DRGH is introduced which maintains a single lobe radiation pattern over the entire band and is comparable in gain and AF with the traditional design.