信号源内置式球形偶极子天线

为实现30 MHz～1 GHz频率范围内的机箱机柜电磁屏蔽效能测量,研制了直径为100 mm的信号源内置式球形偶极子天线.该天线采用具有陡峭上升沿与下降沿的30 MHz方波信号作为信号源,信号源和电源部分均置于天线内部.对天线幅值动态范围的测试结果表明:在与接收天线相距1 m的条件下,该天线在30 MHz～1 GHz频率范围内的动态范围都在50dB以上,大多数谱线的动态范围达到60dB.所研制天线体积小、可连续工作5小时以上,解决了体积较小机箱机柜的电磁屏蔽效能测试难题.

Spherical Dipole Antenna Embedded with Signal Generator

Spherical dipole antenna compling with the measuring requirment of shielding effcetiveness of racks and subracks is developed successfully.The signal generator and the battery are both located inside the antenna The singals from 30 MHz to 1000 MHz are generated from a 30 MHz squre signal with fast rise and fall time. The amplitudes of signals from 30 MHz to 1000 MHz are measured with a test distance of 1 m. Available dynamic range of the antenna is between 50 dB and 60 dB. The antenna has a long operating time of 5 hours. The diameter of the antenna is only 100mm and is very suit for the measurement of shielding effcetiveness of racks and subracks.