| 摘要 |
A magnetically tuned resonant circuit having a resonant frequency which is substantially invariant with external applied static and dynamic stresses is provided. The magnetically tuned resonant circuit includes a housing which provides a magnetic flux return loop. A central post of the magnetically tuned resonant circuit includes a pair of pole pieces, upper and lower portions of the housing, a magnet and an RF structure. The RF structure including a pair of coupling loops and a YIG sphere disposed between the coupling loops is disposed between the pair of pole pieces. In a first embodiment, the elastic compliance of the center post portion of the magnetically tuned resonant circuit is increased by a predetermined amount by providing a nonmagnetic collar around a first one of the pole pieces disposed between said pole piece and the RF structure. In an alternate embodiment, a relatively high compliant RF structure is provided by providing a raised peripheral edge portion on a first surface of the RF structure and a raised central inner portion on a second, opposite surface of the RF structure. With this arrangement, the RF structure is permitted to flex and bend in accordance with applied external forces thereby providing a relatively high compliant structure. In accordance with a further embodiment of the invention, the material of the magnetically tuned resonant circuit is selected to have a saturation magnetostriction constant of less than or equal to 3.2x10-6. In accordance with a further embodiment of the invention, the housing of the magnetically tuned resonant circuit is provided such that the product of the compliance of the upper portion of the housing and the mass associated with the upper portion of the housing is substantially equal to the product of the compliance of the bottom portion of the housing and the mass associated with the bottom portion of the housing.
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