用于电气设备局部放电超高频信号监测的0.4~1GHz分形天线

Fractal Antenna of 0.4-1 GHz for UHF Monitoring of Partial Discharge in Electrical Equipment

为检测电气设备局部放电的超高频（UHF）信号,设计了一种新型超宽带分形天线。该天线融合了分形技术与共面波导技术,从而具有超宽带的特性。对天线的几何参数进行了优化仿真,结果表明：该天线的电压驻波比（VSWR）＆lt;2的频带范围为0.4~1 GHz,在频带内方向性良好,能够实现全向辐射;天线具有较高增益,在0.4~1 GHz频带内平均增益约为1.5 dB;天线尺寸较小,厚度仅为1 mm。搭建了相应的试验平台,对天线的实际应用效果进行了测试,结果表明：所设计的天线具有高增益、高信噪比,可以有效地检测到0.4~1 GHz频带内的超高频信号。因此这种天线在电气设备局部放电在线监测领域具有一定的应用前景。

For detecting the ultra-high frequency（UHF） signals generated from electrical equipment partial discharges （PDs）, we designed a fractal antenna that integrates the fractal technology and the coplanar wavegnide technology to achieve ultra-wide-band characteristics. Meanwhile, we optimized the geometrical parameters of the antenna through simulation. Moreover, we constructed a test platform to test the practical application of the antenna.The simulation results indicate that this antenna has a wide frequency band of 0.4-1 GHz in terms of the voltage standing wave ratio （VSWR） smaller than 2, as well as great directivity and omnidirectional radiation feature. Besides, the antenna has a high gain, about 1.5 dB, and a small size with thickness of 1 ram. The test results show that the antenna has high gain and high noise-signal ratio, and it is effective in collecting PD UHF signals from 0.4 GHz to 1 GHz. Hence the proposed antenna is quite promising for PD on-line detection applications.