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In view of a particular GIS structure, a new type of planar antenna with extremely wide bandwidth is introduced. Due to the analysis of the relationship between antenna impedance and bandwidth, the investigated antenna bandwidth is broadened. The influence of dimension on antenna VSWR is optimized by using the simulation software Ansoft HFSS. Then, an antenna prototype is fabricated and measured. The impedance bandwidth from 1.29 GHz to 5.1 GHz is achieved at VSWR 2.5 with dimensions of 72mm×44mm, which has the ultra wideband performance. The antenna has the characteristic of simple structure, small size, wideband, easy to make, low cost of manufacture, and can be used for UHF partial discharge in the special structure of GIS.

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Based on C++ Builder and Matlab Mixed Programming, reproducible PD(Partial Discharge) signal is achieved , 2D(two-Dimensional) mappings of the real-time display with zoom and rotate 3D (three-Dimensional) mappings are also realized in the design of visualization software. The software transmits the horizontal and vertical angles as parameters to Matlab and draws the 3D mappings, by which the omni-directional and multi-angle display of the PD can be achieved, effectively improving the accuracy of judgments of PD.

Based on the microstrip circuits of electric-field probe with tapered dipoles developed at NBS, influence on different materials of antennas and transmission lines to the E-probe's performance parameters has been discussed. Resistive and high resistance materials are finally confirmed to be respectively better for probe's antennas and transmission lines. This analysis will be useful for optimizing the electric-field probe's performance with respect to different materials which can be varied in the fabrication process.