Disclosed are various embodiments of a guided surface waveguide transmit system. One embodiment of the guided surface waveguide transmit system includes a guided surface waveguide probe configured to transmit a guided surface wave along a lossy conducting medium. The system further includes a controller device configured to receive load status data and signal for the guided surface waveguide probe to adjust transmission of the guided surface wave based at least in part on the load status data.

This document describes apparatus, devices, and methods for providing an isolation element for diversity antennas. The systems and techniques use supporting circuitry, such as wiring connectors, in a transmission device that uses diversity antennas to present a conductor connected to electrical ground to receive a portion of a transmission signal generated by at least one of the antennas to couple the signal to ground. In this manner, the isolation element helps to prevent signals from the diversity antennas from merging and thereby supports the diversity antennas' capability of successfully transmitting a signal when an obstacle may impede the signal transmitted by one of the antennas.

This document describes apparatus, devices, and methods for providing an isolation element for diversity antennas. The systems and techniques use supporting circuitry, such as wiring connectors, in a transmission device that uses diversity antennas to present a conductor connected to electrical ground to receive a portion of a transmission signal generated by at least one of the antennas to couple the signal to ground. In this manner, the isolation element helps to prevent signals from the diversity antennas from merging and thereby supports the diversity antennas' capability of successfully transmitting a signal when an obstacle may impede the signal transmitted by one of the antennas.

An electronic device may include an adjustable power supply, at least one antenna, and associated antenna tuning circuitry. The antenna tuning circuitry may be an integral part of the antenna and may include a control circuit and at least one tunable element. The tunable element may include radio-frequency switches, continuously/semi-continuously adjustable components such as tunable resistors, inductors, and capacitors, and other load circuits that provide desired impedance characteristics. The power supply may provide power supply voltage signals to the antenna tuning circuitry via inductive coupling. The power supply voltage signals may be modulated according to a predetermined lookup table during device startup so that the control circuit is configured to generate desired control signals. These control signals adjust the tunable element so that the antenna can support wireless operation in desired frequency bands.

An electronic device has wireless communications circuitry including an adjustable antenna system coupled to a radio-frequency transceiver. The adjustable antenna system may include one or more adjustable electrical components that are controlled by storage and processing circuitry in the electronic device. The adjustable electrical components may include switches and components that can be adjusted between numerous different states. The adjustable electrical components may be coupled between antenna system components such as transmission line elements, matching network elements, antenna elements and antenna feeds. By adjusting the adjustable electrical components, the storage and processing circuitry can tune the adjustable antenna system to ensure that the adjustable antenna system covers communications bands of interest.

A system and method for tracking medical articles located in a container includes a hybrid isolated magnetic dipole (IMD) probe that provides an activating EM energy RF field having a magnetic near field at least as great as the electric near field, both of which cover the entire interior of the container. The probe comprises a main element having capacitive coupling across at least one slot and spacing above a ground plane to thereby form an isolated electric field and an equally strong or stronger magnetic field that fills the interior of the container to activate RFID tags therein. A dual system is provided for larger containers. A dynamic impedance tuning system controls the probe impedance for increased efficiency in transferring power to the interior of the container. Beam steering is provided with the IMD probe.

Disclosed are various embodiments of a guided surface waveguide transmit system. One embodiment of the guided surface waveguide transmit system includes a guided surface waveguide probe configured to transmit a guided surface wave along a lossy conducting medium. The system further includes a controller device configured to receive load status data and signal for the guided surface waveguide probe to adjust transmission of the guided surface wave based at least in part on the load status data.

Disclosed are various embodiments of a guided surface waveguide transmit system. One embodiment of the guided surface waveguide transmit system includes a guided surface waveguide probe configured to transmit a guided surface wave along a lossy conducting medium. The system further includes a controller device configured to receive load status data and signal for the guided surface waveguide probe to adjust transmission of the guided surface wave based at least in part on the load status data.

An electronic device that reduces deterioration of the antenna characteristics of an antenna corresponding to a plurality of communication bands is provided. An electronic device includes an antenna corresponding to a plurality of communication bands, a conductive member, a GND terminal, a first circuit, a second circuit having an impedance lower than that of the first circuit and a switching circuit. The first circuit and the second circuit can each connect the conductive member and the GND terminal. The switching circuit switches a circuit connecting the conductive member and the GND terminal between the first circuit and the second circuit depending on the communication band for use.

An electronic device that reduces deterioration of the antenna characteristics of an antenna corresponding to a plurality of communication bands is provided. An electronic device includes an antenna corresponding to a plurality of communication bands, a conductive member, a GND terminal, a first circuit, a second circuit having an impedance lower than that of the first circuit and a switching circuit. The first circuit and the second circuit can each connect the conductive member and the GND terminal. The switching circuit switches a circuit connecting the conductive member and the GND terminal between the first circuit and the second circuit depending on the communication band for use.