Fig. 1 The self-resonant microhelix.

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Presentation transcript:

Fig. 1 The self-resonant microhelix. The self-resonant microhelix. (A) A fabricated five-turn microhelix wrapped around a 0.4-mm–outer diameter capillary. During fabrication, the microhelix is tightly wound around a 0.4-mm drill bit and glued inside a Rexolite cylinder. The drill bit is removed, and the glue is allowed to dry for several days. The microhelix assembly is placed in (B) a coupling and support assembly, which includes a planar microcoupler. (C) The planar microcoupler consists of a stripline impedance match to an inductive coupling loop. SMA, SubMiniature version A. (D) Finite-element modeling simulations of the microwave magnetic field, normalized to input power, at 9.5 GHz show an active region of good magnetic field homogeneity over a 0.8-mm height. The measured microwave magnetic field of 3.2 G/W1/2 corresponds to a 20-ns π/2 pulse at approximately 20 mW. Dimensions of the microhelix, where the self-resonance is determined by the capacitance formed between each turn and the inductance of the windings, are shown. The frequency can be tuned during fabrication by the number of turns, the pitch of the turns, or the inner diameter. The microwave characteristics of the fabricated microhelix can be found in table S1. Jason W. Sidabras et al. Sci Adv 2019;5:eaay1394 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).