This invention relates to a YIG oscillator comprising a magnetic structure (9); an oscillator circuit board (23) attached to said magnetic structure and carrying a YIG resonator (25) positioned in an air gap of said magnetic structure; an interface circuit board (3) comprising terminals for external connections, said interface circuit board supporting said magnetic structure by means of a resilient means (7) attached to said interface circuit board; and a flexible circuit (31) connected at one end to the oscillator circuit board and connected at the other end to the interface circuit board.
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