Non-Reciprocal Signal Processing Device

Case ID:
Web Published:

Technology Description


This invention describes a new class of non-reciprocal signal processing devices. Two possible devices include: a magneto-acoustic isolator and a magneto-acoustic circulator. The magneto-acoustic isolator and circulator will exploit the non-reciprocal velocity of surface acoustic waves on magnetostrictive substrates. In contrast to current isolator and circulator technology, which uses the non-reciprocity of electromagnetic waves in ferrites, the proposed devices can be made significantly smaller because the wavelengths of acoustic waves are orders of magnitude smaller than electromagnetic waves at the same frequency.


Features & Benefits


  • Much smaller
  • Less material
  • Low power




  • Wireless communication
  • Radar
  • Sensing


Background of Invention


Circulators and isolators are essential components in many microwave applications, providing nonreciprocal load isolation and duplexing functions not possible with other reciprocal devices. Ferrite circulators are a well-established technology with many manufacturers offering competitive products. However, in current technology, circulators rely on the non-reciprocal propagation of electromagnetic waves in magnetized ferrites. These circulators thus cannot be made smaller than approximately 1.84 times the wavelength of electromagnetic waves in the ferrite at the operating frequency. At 1 Hz, for example, this translates into a minimum diameter of about 25 mm. The non-reciprocal velocity of magneto-elastic surface waves in ferrites offers an opportunity to realize much smaller non-reciprocal devices.




Provisional patent application filed; available


Patent Information:
For Information, Contact:
David Dickson
IP & Licensing Manager
Oregon State University
Albrecht Jander
Pallavi Dhagat-Jander
Magneto-acoustic devices
Signal processing
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