A base element for a YIG band-pass filter or a YIG oscillator is formed from a non-magnetic material and comprises filter chambers, which are formed in the base element, wherein the filter chambers are connected to one another by channels, and YIG elements are disposed in the filter chambers and electromagnetically coupled by coupling loops disposed in the filter chambers. Slots into which contact lugs connected to the coupling loops extend, are formed in the base element. Recesses intersect the slots and and are used to accommodate a solder mass. The contact lugs are fixed in the recesses by the solder mass.