An antenna assembly comprises a circuit board formed with an antenna, a coaxial cable and a conductive film. The circuit board has an edge, a first pad and a second pad. An outer conductor of the coaxial cable has an exposed portion which is exposed from an outer cover of the coaxial cable over a predetermined area. The exposed portion is connected with the second pad. In a second direction perpendicular to a first direction, a center of the coaxial cable is positioned at a predetermined position. The conductive film is fixed on the circuit board. The conductive film has a main portion and at least one extending portion. In the predetermined area, the at least one extending portion and the second pad are aligned in the first direction. The at least one extending portion extends from the main portion over the predetermined position in the second direction.

This invention is directed to antenna for wireless charging systems configured and operable to create strong electromagnetic near fields in a designated volume and by that to improve the coupling between a transmitting antenna and a receiving antenna of a wireless charging system, which improves the efficiency level of the electromagnetic energy transfer between said transmitting and receiving antennas of a wireless charging system, the antenna comprising a conductive material shaped to form two or more revolutions, each revolution adjacent to the previous revolution, wherein each of said revolution having a geometric shape. The antenna is further comprising a ground plane, wherein said formed conductive material is adapted to confine the electromagnetic near field distribution into a charging zone relative to the ground plane.

This invention is directed to antenna for wireless charging systems configured and operable to create strong electromagnetic near fields in a designated volume and by that to improve the coupling between a transmitting antenna and a receiving antenna of a wireless charging system, which improves the efficiency level of the electromagnetic energy transfer between said transmitting and receiving antennas of a wireless charging system, the antenna comprising a conductive material shaped to form two or more revolutions, each revolution adjacent to the previous revolution, wherein each of said revolution having a geometric shape. The antenna is further comprising a ground plane, wherein said formed conductive material is adapted to confine the electromagnetic near field distribution into a charging zone relative to the ground plane.

A method includes determining an operating frequency of an antenna at a component of the antenna. The method includes determining, at the component of the antenna, a filter node of a plurality of filter nodes to activate to tune the antenna to the operating frequency. The method includes transmitting power to the filter node, wherein the power is transmitted via a first optical fiber. The method also includes sending a signal from the component to a light source. The activation of the light source sends an optical signal to the filter node. The filter node adjusts a characteristic of a radiating element coupled to the filter node using the power responsive to the optical signal. Adjustment of the characteristic facilitates tuning the antenna to the operating frequency.

A communication circuit according to one embodiment includes a single element antenna, a plurality of signal-limiting circuits, a high-frequency transceiver circuit, and a low-frequency transceiver circuit. The high-frequency transceiver circuit is adapted to be selectively coupled to the single element antenna via the plurality of signal-limiting circuits and tuned to operate at a high frequency carrier frequency, and the low-frequency transceiver circuit is adapted to be selectively coupled to the single element antenna via the plurality of signal-limiting circuits and tuned to operate at a low frequency carrier frequency.

A method of tuning an electrically small antenna comprising a radiating element and a support structure comprises applying a force to the support structure to change a shape or a dimension of the radiating element to increase or decrease a frequency at which the electrically small antenna resonates.

A method of tuning an electrically small antenna comprising a radiating element and a support structure comprises applying a force to the support structure to change a shape or a dimension of the radiating element to increase or decrease a frequency at which the electrically small antenna resonates.

An electronic device is provided. The electronic device includes a foldable housing, a flexible display, at least one printed circuit board (PCB), and a wireless communication circuit. The foldable housing includes a hinge structure, a first housing structure connected to the hinge structure and including a first surface facing in a first direction, a second surface facing in a direction opposite to the first direction, and a first lateral member surrounding a first space between the first surface and the second surface, and a second housing structure connected to the hinge structure and including a third surface facing in a second direction, a fourth surface facing in a direction opposite to the second direction, and a second lateral member surrounding a second space between the third surface and the fourth surface.

An apparatus includes a radio frequency (RF) circuit to transmit or receive RF signals. The apparatus further includes a loop antenna to transmit or receive the RF signals. The apparatus further includes an impedance matching circuit coupled to the RF circuit and to the loop antenna. The impedance matching circuit includes lumped reactive components.

An apparatus includes a radio frequency (RF) circuit to transmit or receive RF signals. The apparatus further includes a loop antenna to transmit or receive the RF signals. The apparatus further includes an impedance matching circuit coupled to the RF circuit and to the loop antenna. The impedance matching circuit includes lumped reactive components.