屏蔽室内天线系数的确定

The Determination of Antenna Factors in Shielded Encolsures

按有关标准在屏蔽室内对装舰设备和分系统进行电场辐射发射和辐射敏感度测试时,采用远场天线和在开阔场地所获得的天线系数误差较大,有时可达±40dB。本文提出在屏蔽室内天线系数必需重新确定的依据和方法,以减少测量误差。并可供今后修订标准作参考。

When the state military standard GJB 151—86 and GJB 152—86 are used to test electric-field radiated emission and radiated susceptibility of shipborne electrical equipment and subsystems in shielded enclosures, some big errors may occur, and these errors may be even bigger sometimes up to±40 dБ when the far field antenna and open field site antenna factors are used. This paper presents consideration and. test methods of antenna factors which have to be determined again in shielded enclosures, so as to decrease the measurement errors and these could be provided as reference for further correction of state military standard.