Design of a unbiased microwave circulator using a magnetic nanowired substrate
(2005) European Microwave Association. Proceedings — Vol. 1, n° 1, p. 67-72 (2005)
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- Abstract
- A very compact planar fully integrated circulator operating at millimeter wavelength has been designed using a magnetic substrate combining a polymer membrane with an array of ferromagnetic nanowires. The original feature of this substrate, called magnetic nanowired substrate (MNWS), relies on the fact that the circulation effect is obtained without re- quiring any biasing dc magnetic field. This leads to a significant reduction of device dimensions since no magnetic field source is needed, and a realistic ability for integration with monolithic microwave integrated circuits. The circulator design is performed by an efficient analytical model including a self design of the impedance matching network. This model also allows a physical understanding of the circulation mechanism through the access to the electromagnetic field patterns inside the circulator substrate. Based on the excellent agreement between the theoretical and experimental results, the model is used to predict the improve- ment of circulator performances resulting from a reduction of dielectric and conductor losses. Insertion losses lower than 2 dB with an isolation higher than 45 dB are expected for MNWS circulators with a low-loss substrate and thick metallic layers.
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Citations
Saib, A., Darques, M., Piraux, L., Vanhoenacker-Janvier, D., & Huynen, I. (2005). Design of a unbiased microwave circulator using a magnetic nanowired substrate. European Microwave Association. Proceedings, 1(1), 67-72. https://hdl.handle.net/2078.5/51963 (Original work published 2005)