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ABSTRACT: A review of the design criteria for magnetostatic volume wave
band-pass resonating filters will be presented. The prediction of the
radiation resistance and of the reactance of microstrip lines coupled to
magnetic films in grounded configurations will be used to model straight
edge resonators by means of lumped elements. As an application, the
performances of tunable single and multiple stage narrow-band filters
working at X-band will be evaluated
IEEE Transactions on Magnetics 10/1996; · 1.36 Impact Factor
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ABSTRACT: The frequency shift due to temperature variation in the microwave
response of a magnetostatic forward volume wave YIG straight edge
resonator in a band-stop configuration filter has been measured. In
particular, the effect of the angular variation θ<sub>e</sub> of
the dc magnetic bias field H<sub>e</sub> with respect to the film plane
on the temperature frequency shift has been experimentally tested, and
it has been demonstrated that thermostability improvement can be
obtained as a function of θ<sub>e</sub>. Moreover, a good
agreement between theoretical expectations and experimental findings has
been obtained
IEEE Transactions on Magnetics 10/1996; · 1.36 Impact Factor
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ABSTRACT: Magnetostatic wave coupled straight edge resonators have been
experimentally tested by means of a waveguide ferromagnetic resonance
experiment to check their potential as microwave coupled filters. Few dB
ripples and tens of MHz bandwidths have been obtained for configurations
in the range λ/4- to λ-coupling
IEEE Transactions on Magnetics 12/1995; · 1.36 Impact Factor
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ABSTRACT: An analysis of the signal reflections originating at the garnet film ends and of the triple transit between the microstrip transducers in magnetostatic volume wave delay lines has been performed. The influence of those effects on the band shape and on the insertion loss of magnetostatic wave devices has been inferred and compared with experimental results. In this framework, the possible utilization of the reflections for filterbank applications is also proposed.
Journal of Applied Physics 04/1993; · 2.17 Impact Factor
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ABSTRACT: The first experimental results on a nondispersive, bandwidth
tunable magnetostatic wave (MSW) filter using the forward and backward
volume wave (BW) propagation at X -band are shown and compared
with theoretical predictions. In order to build up a configuration as
simple as possible including just two coupled filters, two delay lines
with opposite frequency behavior have been utilized. By using this
solution, the possibility for tuning BW up to 400 MHz is achieved. It is
concluded that the MSW filter configuration considered is suitable for
BW tunable, nondispersive device applications. However, the filter needs
improvements to optimize the band shape, especially to steepen the
low-frequency side and to minimize the ripple amplitude
IEEE Transactions on Magnetics 10/1992; · 1.36 Impact Factor
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ABSTRACT: The possibility of controlling the bandwidth and the dispersion of
a tunable magnetostatic volume wave (MSVW) delay line filter based on
yttrium-iron-garnet (YIG) films is demonstrated. The simulation has been
performed on a MSW filter consisting of two delay lines in cascade
having opposite dispersion properties: a backward volume wave delay line
and a forward volume wave one. The filter can be used effectively in the
microwave frequency range for bandwidths between 20 MHz and 200 MHz,
with the center frequency tunable with the DC magnetic bias
IEEE Transactions on Magnetics 12/1991; · 1.36 Impact Factor
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ABSTRACT: The growth of pure yttrium iron garnet (YIG) and (GdBiAlCaGa)-substituted garnet films by means of rf sputtering and their morphological, magnetic and optical characterization is described.
Journal of Magnetism and Magnetic Materials. 104:436-438.
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ABSTRACT: The growth by rf diode sputtering of magnetic garnet thin single and multiple layers and their morphological, compositional and optical absorption characterization are described. Crystalline, defect-free layers and multilayer structures can be obtained by properly imposing the sputtering conditions (substrate temperature and rf power) and the thermal post-annealing cycle to crystallize ex-situ the garnet films.
Materials Letters. 14(2-3):123-126.
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ABSTRACT: The possibility to control the bandwidth and the dispersion of a tunable magnetostatic volume wave (MSVW) delay line filter based on yttrium ion garnet (YIG) films is demonstrated. The simulation has been performed on a MSW filter consisting of two delay lines (DL's) in cascade having opposite dispersion properties: a Backward Volume Wave delay line and a Forward Volume Wave one.
Ieee Transactions on Magnetics. 27(6):5471-5473.
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ABSTRACT: In this work the microwave response of an integrated structure composed of coupled magnetostatic wave (MSW) straight edge resonators (SER) based on an epitaxial yttrium iron garnet film and measured by means of a ferromagnetic resonance (FMR) experiment has been studied. By using the FMR spectra, a simulation of microwave filters based on integrated SERs has been performed, demonstrating great potential in the realization of planar MSW tunable devices.
Journal of Magnetism and Magnetic Materials. 157:471-472.
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ABSTRACT: In this paper the first experimental results on a nondispersive, bandwidth tunable magnetostatic wave filter using the forward and backward volume waves propagation at X band are shown and compared with theoretical predictions.
Ieee Transactions on Magnetics. 28(5):3303-3305.
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ABSTRACT: In this work the optical absorption properties of Ca-substituted yttrium iron garnet films are discussed. In particular the optical absorption of sputtered amorphous garnets film and the contribution of Ca-ions are analyzed. A comparison with the optical response of crystalline garnets is also made.
Optical Materials. 4(5):623-627.
