Noise performance of magneto-inductive cables

Noise performance of magneto-inductive cables

Thin-film magneto-inductive cables

Magneto-inductive cables for low (ca 100 MHz) radio frequencies are demonstrated in thin-film form. 20 cm long resonant elements are formed using double-sided patterning of copper-clad polyimide, based on single-turn inductors and parallel-plate capacitors that use the substrate as an interlayer dielectric. Continuous cables are formed by overlaying elements, in an arrangement that allows a hig...

Broadband coupling transducers for magneto-inductive cables

A broadband resonant transducer capable of low-loss coupling between magneto-inductive (MI) waveguides and a real impedance is introduced. The transducer is an L–C circuit resonating at the resonant frequency of the elements forming the guide. However, the values of the components in the transducer are different, and chosen to obtain two separate nulls in reflection so that low reflection is ob...

MR-Safe Cables – an Application of Magneto-inductive Waves?

An analysis is presented of transmission lines that are periodically interrupted by isolation transformers. Such lines have applications in magnetic resonance imaging, where the transformers act to block common-mode signals excited by the transmitter while passing differential mode signals from a detector. The dispersion characteristics are derived, and it is shown that the line is a form of me...

Magneto-inductive waveguide devices

Devices formed from magneto-inductive waveguides based on coupled loop resonators are considered using simple analytic theory, initially assuming lossless propagation and nearestneighbour coupling. Two-port devices that were considered include mirrors, Fabry–Perot resonators, Bragg gratings and tapers, while more general N-port devices include power splitters and directional couplers. Condition...