Our isolators and circulators have an internal magnet. The magnetic field generated by this magnet can influence nearby components. Our isolators and circulators have integrated shielding, but if additional shielding is needed, this external shield can be added. This shield is compatible with all our Triple junction 4-8 and 4-12 GHz Isolators and Circulators. For additional information refer to the datasheet of the relevant isolator/circulator.