YIG Oscillators: Is a Planar Geometry Better?
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Abstract
Description
Two yttrium-iron-garnet (YIG) oscillator technologies are
comparerk the more mature YIG sphere oscillator technology which is
based on the uniform (resonant) precession of the electron spins in a smafl
sphere of YIG, and the new planar YIG technology which utilizes the
propagation of magnetostatic waves in an epitaxiaf film of YIG. The YIG
sphere technology has been used for microwave oscillators for more than
25 years, but has two significant areas of difficulty in applications the
alignment of the YIG sphere in the magnetic bias field coupfbrg cavity
requires great precision and the gain element requires a negative resistance
element to sustain oscillation. The MSW technology is much newer and
less well understood, but the resonator elements are fabricated using a
50- pm line width planar technology making it assappealhg candidate. Both
technologies are reviewed herein with regard to resonant element theory,
temperature, and noise characteristics. New data and theory are presented
on MSW resonator optimization.
Keywords
Q Science (General), QC Physics