IMPROVED METALLIC-FERRITE RF SHIELDING OF RECIEVER IF FILTERS

摘要

In a superheterodyne receiver, energy can bypass a filter by magnetically coupling to a metallic radio frequency shield. This is especially a problem with small form factor devices in which the metallic radio frequency shield is positioned close to the filter. By using a ferrite-embedded element positioned betwen the filter and the RF shield, some of the undesired harmonics produced by the mixer can be dissipated into heat.