Modeling and design of microwave devices based on ferromagnetic nanowires
Aimad SaibAs wireless communication systems are flourishing and operating frequencies are progressively increasing, there exists nowadays a strong demand for RF devices at millimeter wavelengths. Nonmetallic ferromagnetic materials, also called ferrites, have found wide applications in RF technology as they possess the combined properties of a magnetic material and an electrical insulator. The remarkable flexibility in tailoring the magnetic properties, the very high resistivity, price and performance considerations make ferrites the first choice materials for microwave applications. However, the frequency range of operation, the bandwidth, and the aptitude to be integrated in MMICs should be improved. In this work, a new class of magnetic materials which could overcome the main disadvantages encountered when using ferrites in RF devices operating at millimeter wavelengths is studied. This material, called magnetic nanowired substrate (MNWS), is composed of an array of ferromagnetic nanowires embedded in a polymer substrate. First, the ferromagnetic nature of nanowires yields very high saturation magnetizations, thus operating frequencies higher than 40 GHz. Next, the nanometric wire diameter allows an easy penetration of electromagnetic waves inside the MNWS. Moreover, due to the high aspect ratio of nanowires the desired magnetic properties are obtained without an external magnetic field. This leads to a considerable potential increase of the compactness and ease of integration in MMICs. Various potential applications, such as filters and circulators, of this new material are presented.
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Rhonda Franklin (born 1965) is a Professor of Electrical and Computer Engineering at the University of Minnesota.She is a microwave and radio frequency engineer whose research focuses on microelectronic mechanical structures in radio and microwave applications. 16 Jul 2019 ... Microwave devices based on nanowires have several advantages over ... of metallic nanowire arrays [9] was used to design slow-wave transmission lines [10 ], while the double ferromagnetic resonance effect in magnetic nanowires was exploited to ... model N5247A PNA-X from Agilent Technologies.
Modeling and design of microwave devices based …
31 Oct 2018 ... Our findings indicate that core–shell [email protected] nanowires ([email protected] ... Based on the transmit line theory, the electromagnetic microwave absorption ... pulse protection, electromagnetic compatibility for electronic devices, ... Y.; Wang, N.; Tian, C. H.; Ma, J.; Xu, P.; Han, X. J. Rational Design of Yolk-Shell ... 18 Apr 2019 ... Their microwave parameters, dielectric constant, electrical conductivity, and ... is validated by the detection of a ferromagnetic resonance showing a linear ... of microwave properties of carbon-based nanopowders, decorated or not with ... permeability) is mandatory to design a number of microwave devices ...
Nonreciprocal microwave devices based on magnetic nanowires ... The design is related to waveguide E-plane isolators but is planar and much smaller than typical waveguide isolators. There is ... range can be increased by using ferromagnetic metals. 3 ... A simple model is developed to capture the generic physics of the ...
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