A “coaxial” transmission line has inner conductor of radius a and outer conductor of radius b, but the axes of these two cylinders are offset by a small distance δ ¿ b. Deduce the capacitance and inductance per unit length, and the impedance Z, accurate to order δ/b. The (relative) dielectric constant and permeability of the medium between the two conductors both unity. The relevant frequencies...

Indirect measurements of glucose measure its effect on other properties. For example, glucose seems to change the resistance of the skin to a radio frequency signal so the Pendra device measures glucose via radio frequency impedance. The Orsense device measures Rouleax formation, a “stacking” of red blood cells in small blood vessels, in response to glucose. The Glucon device indirectly measure...

A new approximation technique to find the total series impedance per unit length for quasi-TEM transmission lines including conductor loss has been developed. It is shown through the use of conformal mapping that both frequency dependent skin-depth and proximity effects can be accurately modeled. Comparison between experimental measurements and calculations for twin-lead, coplanar strips, paral...

Wearable bioelectronics with emphasis on the research and development of advanced person-oriented biomedical devices have attracted immense interest in past decade. Scientists clinicians find it essential to utilize skin-worn smart tattoos for on-demand ambulatory monitoring an individual’s vital signs. Here, we report ultrathin platinum-based two-dimensional dichalcogenide (Pt-TMDs)-based elec...

The integrity and safety of metallic structures can be jeopardized by structural damage (e.g., yielding, cracking, impact, corrosion) that can occur any time. While various sensors have been proposed and validated for structural health monitoring, most sensors only provide data at a discrete point on the structure. Here, a carbon nanotube-polyelectrolyte sensing skin is proposed for monitoring ...