Shielding Effectiveness Research due to Antenna Polarization Characteristic

초록

Internationally, Weapons based on EMP are rapidly developed. Meaning of EMP is abbreviation of Electromagnetic pulse. And Generally, This meaning is high power electromagnetic wave. But, In the academic world, Accurate representation of EMP is HPEM(High power Electromagnetic). And to minimize influence of HEMP , Shielding facility including high shielding effectiveness(SE) is being manufactured. when designing shielding facility, Required units like vent, waveguide, shielding door should be included in the shielding facility. PoEs generating by these units can drop performance of shielding facility. In this paper, To analyze these factors, After artifical PoEs are installed, we are compared with shielding effectiveness according to vertical and horizontal polarization of antenna. And Operational frequency is 10k~1GHz defined to MIL-STD-188-125-1. But applying antenna according to frequency is different So, we apply Loop antenna in the 10k ~ 20MHz and biconical antenna in the 20M ~ 100MHz, log periodic antenna in the 100M ~ 1GHz. And As defined to MILSTD-188-125-1, the position of transmitting antenna is 2.05m away from the shielding wall. Likewise, The position of receiving antenna is 1.00m away from the shielding wall. Used the shielding room has shielding effectiveness more than 90dB. The size of shielding room is 2.4m × 6m × 2.4m. Configuration units of the shielding room are one shielding door, one filter, one waveguide. And we measure electric field strength according to shape of PoE. After we are compared with shielding effectiveness of shielding facility and shielding effectiveness of no shielding facility electric field strength, we calculate shielding effectiveness.