This International Standard gives guidance for uniform rules for the drafting of specifications for microwave ferrite components. Microwave ferrite components in this guide are restricted to transmission line components such as circulator, isolator, phase-shifter, switch and filter. Less common components such as attenuators and limiters are not specifically described, but many of the properties considered may apply to them.
GSO IEC 61609:2014 history
2014GSO IEC 61609:2014 Microwave ferrite components - Guide for the drafting of specifications