High Frequency Magneto-Acoustic Signal Correlator

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Sharp, frequency-selective filters that isolate the target frequency from interference by neighboring channels are essential parts of modern communication systems. Currently, most filters use acoustic wave technology. Acoustic wave devices have low frequency dispersion, a large linear dynamic range, low power losses and efficient transducers. However, acoustic wave filters are not viable with frequencies beyond 6 GHz. Acoustic losses increase quadratically with frequency, so the quality of the filter is limited at higher frequencies.
Alternatively, high frequency filters can be made using spin wave-based technology. Although the power losses of spin wave devices are higher than acoustic was devices at current frequencies, losses in spin wave propagation increase only linearly with frequency, as opposed to quadratically. Thus, at frequencies beyond 5 GHz, spin wave losses may be less than those of acoustic wave devices. Given the advantages of relatively low losses (at 5+ GHz) and longer wavelengths, spin wave-based filters will provide a competitive solution for miniaturized filters to support mobile communications at higher frequency bands.

Technology Description
This technology is a signal processing device that couples the benefits of spin wave and acoustic wave devices, taking advantage of the low dispersion and high dynamic range of acoustic waves and the tunability and nonlinear effects provided by spin waves. The device utilizes the interactions between acoustic waves and spin waves in magneto strictive materials. In such materials, strain (the propagating variable in acoustic waves) and magnetization (the propagating variable in spin waves) are coupled. The strength of this coupling depends on the material in which the waves are traveling and is measured by the magnetostriction coefficient, or the magneto-elastic constants. These devices can fill a niche where acoustic wave devices are limited due to large attenuation losses and where electromagnetic wave filters are too large for applications.

Features & Benefits

  • Couples the low dispersion and high dynamic range of acoustic waves with the tunability and nonlinear effects provided by spin waves.
  • High frequency operation capabilities, as high as 300 GHz


  • High bandwidth mobile communications
  • Secure mobile communications

Provisional patent; Patent application submitted

Patent Information:
For Information, Contact:
David Dickson
IP & Licensing Manager
Oregon State University
Albrecht Jander
Pallavi Dhagat
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