Design Of The Small Geometry Shield Shielding Effectiveness Test Antenna

The sharp deterioration of electromagnetic environments and the miniaturization ofvolume in electronic equipments and electronic systems, makes the shielding effectivenesstest of small shield becoming more and more frequently. The small geometry shield shieldingeffectiveness testing antennas are electromagnetic compatibility test antennas for shieldingeffectiveness test of small geometry shield.Due to the frequency range of electromagnetic compatibility tests converging betweentens of hertz to tens of gigahertz, the testing frequency range is so wide that if the bandwidthof the using antenna is narrow, the number of the using antennas to cover such a widefrequency range will lead to the tests can’t carry on at all, therefore, the electromagneticcompatibility testing antennas are generally wideband antennas. The small geometry shieldshielding effectiveness testing antennas, as a class of antennas with special application in theelectromagnetic compatibility testing antennas, not only required to have a widebandcharacteristic but also have a miniaturized characteristic duing to their test objects are smallgeometric dimensions shields.Fractal technology is a very popular technology which has been researched in recentyears. The fractal structure, because of its self-similarity properties and fractal dimensionproperties, is applied to the design of antennas, the obtained antennas will not only have awideband characteristic but also have a miniaturized characteristic, and may have a betterantenna performancesBased on the analyses of some commonly used fractal structures, this paper used thelog-periodic antenna as the basis antenna structure and the second order tree fractal structureas the discrete transducer units of antenna, designed a smaller geometry tree fractallog-periodic antenna. The results of antenna simulation analysis by HFSS numericalsimulation software show that the performances of this miniaturized antenna can be able tomeet the needs of shielding effectiveness test of some small geometric dimensions shield, andalso can be actually produced and applied into their small geometry shield shielding effectiveness tests.