Systems and methods are provided for providing vibration transduction and radio-frequency communication in proximity to an electrically conductive structure. The system may comprise an antenna element, an electrically conductive structure in proximity to the antenna element, and a vibration transducer comprising a material. The material may comprise a ferromagnetic material with piezoelectric properties. The vibration transducer may be positioned between the antenna element and the conductive structure.

A noise cancelling gradiometer probe includes an insulating material having a first side and a second side; a first, second, third and fourth coaxial cables forming a first, second, third and fourth loops, respectively, where a portion of each of the first , second, third and fourth loops is locating on the first side of the insulating material and a portion of the first , second, third and fourth loops is locating on the second side of the insulating material.

An electronic device may include a substrate and a conductive layer on the substrate. The conductive layer may be patterned to form a first region and a second region that surrounds and defines the shape of the first region. The first region may be formed from a continuous portion of the conductive layer. The second region may include a grid of openings that divides the conductive layer into an array of patches. The first region may form an antenna resonating element for an antenna. The second region may block antenna currents from the antenna resonating element and may be transparent to radio-frequency electromagnetic waves. The openings may have a width that is too narrow to be discerned by the human eye. This may configure the first and second regions to appear as a single continuous conductive layer despite the fact that an antenna resonating element is formed therein.

An electronic device may include a substrate and a conductive layer on the substrate. The conductive layer may be patterned to form a first region and a second region that surrounds and defines the shape of the first region. The first region may be formed from a continuous portion of the conductive layer. The second region may include a grid of openings that divides the conductive layer into an array of patches. The first region may form an antenna resonating element for an antenna. The second region may block antenna currents from the antenna resonating element and may be transparent to radio-frequency electromagnetic waves. The openings may have a width that is too narrow to be discerned by the human eye. This may configure the first and second regions to appear as a single continuous conductive layer despite the fact that an antenna resonating element is formed therein.

System and method for monitoring material change by measuring at least one metric. In a first configuration, an EM signal is transmitted across a calibrated transmission configuration to at least one load including the material, the reflection is measured, and the at least one metric is calculated based at least on the reflection. In a second configuration, an EM signal is transmitted in the vicinity of at least one resonator that is operably coupled with a load that can include the material. An EM signal is received that has been affected by the resonator, and a measurement of the at least one metric can be based at least on the received signal.

System and method for monitoring material change by measuring at least one metric. In a first configuration, an EM signal is transmitted across a calibrated transmission configuration to at least one load including the material, the reflection is measured, and the at least one metric is calculated based at least on the reflection. In a second configuration, an EM signal is transmitted in the vicinity of at least one resonator that is operably coupled with a load that can include the material. An EM signal is received that has been affected by the resonator, and a measurement of the at least one metric can be based at least on the received signal.

An antenna device includes a magnetic portion and a coil. The magnetic portion includes a plurality of magnetic pieces arranged. The plurality of magnetic pieces are individual pieces of a magnetic body. The coil is formed of a litz wire coiled around the magnetic portion. The litz wire includes a bundle of a plurality of conducting wires.

An antenna device includes a magnetic portion and a coil. The magnetic portion includes a plurality of magnetic pieces arranged. The plurality of magnetic pieces are individual pieces of a magnetic body. The coil is formed of a litz wire coiled around the magnetic portion. The litz wire includes a bundle of a plurality of conducting wires.

A loop antenna assembly is provided that can include a loop antenna with one of more magnet wires encased in a non-magnetic flexible sheath and mounted to a transceiver block that is mountable to a tool body, where the loop antenna can at least partially encircle the tool body. The loop antenna can include a plurality of magnet wires each individually encased in the sheath, with a metal adaptor attached to each end. The magnet wire can be coated with thin insulation, thin enamel insulation, and/or a polymer film. A plane of the loop antenna can be perpendicular relative to the longitudinal axis or at an obtuse angle relative to the longitudinal axis. A non-magnetic locating ring positioned in the loop antenna assembly can secure the loop antenna of the assembly about the tool body.

A looped conductor (1) is opened at both ends, one end (1a) is connected to a conductor plate (2), and the other end (1b) is connected to a lead wire (5b). The conductor plate (2) is disposed parallel to a loop surface of the looped conductor (1) and has a shape covering the looped conductor (1). A lead wire (5a) is connected to the conductor plate (2), and outputs from the lead wire (5a) and the lead wire (5b) are specified as a measurement output of an electromagnetic field probe.