Experimental analysis on the result of shielded transfer impedance for RF cables

摘要

The paper context is to describe the findings on measurement shield transfer impedance for the RF cables with contrast. The emission from RF cables plays a high role between one system and another in the EMI measurement environment. It's one of the most polluting sources to control radiated emission during measurements. If the center conductors of cables come with shielded, this provides the uniform transfer impedance throughout length of cable. The variation in the transfer impedance will make a significant change in the radiated emission measurement. (i.e. it depends on the shield cables single or double around the conductors). Due to this the leakage current flowing through shield becomes large value to induce the magnetic field along the cable. Thus transfer resistance is as much as lowered to create a low impedance path for grounding the leakage current. When a field exists strongly along a cable and it travels through space as the radiated emission. This experiment is carried out to analyse and observe very low transfer impedance for parallel shielding around the conductor. Any combination of resistances in parallel diminishes the equivalent resistance. Hence, under this approach it has been tried to see an increased susceptible in the RF cables which offers the better compliance results of an EMI suppression. The transfer impedance characteristics of the single shield and or double shield around the conductors have been measured and the results of measurements are tabulated for analysis. For conducting the measurements the standard BS EN 50289-1-6-2002 is followed. The conclusion of this experimental result analysis helps to realize better shielded in RF cables harness.