Electrical Mode Stirring in Reverberating Chambers by Reactively Loaded Antennas

Electrical mode stirring in reverberating chambers for electromagnetic compatibility is accomplished by antennas that are loaded by variable reactances. The principle is derived from a network model of the chamber that employs measurable coupling factors. The concept is experimentally confirmed in the gigahertz-range for a 1.92 m x 1.84 m x 2 .91 m chamber with four conical antennas placed on one sidewall. One antenna is connected to a generator; the other three antennas are reactively loaded by variable short circuit plungers. The resonances are considerably shifted by varying the reactive loads.