Hewlett-packard Company

Selenia Industrie Elettroniche Associate S.p.a.

I.e.s.s. C.n.r.

Giuseppe Miccoli

Kok-Wai Chang

Waguih S Ishak

William E Kunz

Kok Wai Chang

Paolo De Gasperis

Carlo Di Gregorio

Riccardo Roveda

A resonator in which the input and output transducers are positioned to couple strongly into a resonant mode of interest. Signal drains are included to drain energy out of spurious resonant modes. In a magnetostatic wave resonator, the signal drains are preferably grooves in the surface of the ferrimagnetic film forming the resonator cavity.

Mode selective magnetostatic wave resonators

A magnetostatic wave structure in which magnetostatic wave signals are coupled between discrete magnetostatic wave elements without the use of microstrip transducers. This structure consists of a plurality of blocks of ferrimagnetic material in which each block has an edge close enough to an edge of another block that a magnetostatic wave in the first of these blocks couples across the gap between these two edges into the second of these blocks. Linear and nonlinear configurations are presented that include a band pass filter.

Edge coupler magnetostatic wave structures

A magnetostatic wave resonator having a transducer oriented such that it is tangent at all points to a wavefront of a traveling wave component of a resonant mode of the resonant cavity. In a rectangular cavity of width L.sub.x and length L.sub.y, the transducer is perpendicular to the wavevector k=(m.pi./L.sub.x)e.sub.x +(n.pi./L.sub.y)e.sub.y for some nonzero integers m and n, whereby the transducer optimally transfers energy into the resonant mode that is a linear superposition of travelling waves that includes this wavevector. This enhances coupling into the resonant mode of interest and reduces the amount of coupling into spurious modes.

Diagonally coupled magnetostatic wave resonators

Method for the controlled suppression of magnetostatic waves within magnetic garnet films for microwave circuit applications, based upon the adoption of multilayer structures of epitaxial garnet films of low magnetic losses and high magnetic losses.

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Rome, Italy

Giuseppe Miccoli