Substrate Integrated Waveguide Isolator based on ferromagnetic nanowires in porous alumina template
(2014) Applied Physics Letters — Vol. 105, n° 19, p. 183107 (2014)
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- Abstract
- We demonstrate the operation of a fully integrated and miniaturized waveguide based on ferromagnetic nanowires as a promising alternative to macroscopic ferrite slab-loaded metallic rectangular waveguides used as microwave isolators. Nanowires of various heights are selectively grown at dedicated areas into a low-loss nanoporous alumina template in order to create the shielding walls of a Substrate Integrated Waveguide (SIW) topology and the ferromagnetic slab supporting a circularly polarized nonreciprocal propagation. A model is proposed for the microwave response of the SIW and its non-reciprocity, which takes into account the substrate permittivity and the tensorial permeability of the ferromagnetic nanowires, and its predictions are validated by measurements. A significant isolation of 7 dB/cm is obtained experimentally at 13.5 GHz, without the need of a DC biasing magnetic field.
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Citations
Van Kerckhoven, V., Piraux, L., & Huynen, I. (2014). Substrate Integrated Waveguide Isolator based on ferromagnetic nanowires in porous alumina template. Applied Physics Letters, 105(19), 183107. https://doi.org/10.1063/1.4901277 (Original work published 2014)