کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1532916 | 1512274 | 2008 | 13 صفحه PDF | دانلود رایگان |
Parametric amplification of magneto-inductive (MI) waves propagating in magnetically coupled chains of nonlinear L–C resonators is studied. Analysis is first presented for a three-frequency travelling wave scheme in which the signal, idler and pump all propagate as MI waves. The effect of de-coupling the idlers is then considered and it is shown that this configuration relaxes the standard phase matching condition. Confirmation of the theory is provided using low-frequency PCB unit cells containing varactor diodes. The cells are characterised individually and then arranged as a 16-element ring resonator. Frequency matching and selective amplification of the primary resonance is demonstrated. The primary resonance can be excited using the field of a rotating magnetic dipole, and an application in magnetic resonance imaging is described.
Journal: Metamaterials - Volume 2, Issues 2–3, September 2008, Pages 122–134