According to various embodiments of the present invention, an antenna system comprises: an antenna including a first radiator element operating in a first frequency band and a second radiator element operating in a second frequency band; a power supply part connected to the antenna; a first grounding part and a second grounding part; a matching circuit connected to the first grounding part; and a switch, wherein the switch can connect the first radiator element to the second grounding part and connect the second radiator element to the matching circuit when the antenna transmits or receives a signal through the first frequency band, and can connect the second radiator element to the second grounding part and connect the first radiator element to the matching circuit when the antenna transmits or receives the signal through the second frequency band.

According to various embodiments of the present invention, an antenna system comprises: an antenna including a first radiator element operating in a first frequency band and a second radiator element operating in a second frequency band; a power supply part connected to the antenna; a first grounding part and a second grounding part; a matching circuit connected to the first grounding part; and a switch, wherein the switch can connect the first radiator element to the second grounding part and connect the second radiator element to the matching circuit when the antenna transmits or receives a signal through the first frequency band, and can connect the second radiator element to the second grounding part and connect the first radiator element to the matching circuit when the antenna transmits or receives the signal through the second frequency band.

System and methods are described herein for providing wireless power to a target device, such as a laptop computer, a mobile phone, a vehicle, robot, or an unmanned aerial vehicle or system (UAV) or (UAS). A tunable multi-element transmitter may transmit electromagnetic radiation (EMR) to the target device using any of a wide variety of frequency bands. A location determination subsystem and/or range determination subsystem may determine a relative location, orientation, and/or rotation of the target device. For a target device within a distance range for which a smallest achievable waist of the Gaussian beam of the EMR at an operational frequency is smaller than the multi-element EMR receiver of the target device, a non-Gaussian beamform may be determined to increase efficiency, decrease overheating, reduce spillover, increase total power output of rectenna receivers on the target device, or achieve another target power delivery goal.

System and methods are described herein for providing wireless power to a target device, such as a laptop computer, a mobile phone, a vehicle, robot, or an unmanned aerial vehicle or system (UAV) or (UAS). A tunable multi-element transmitter may transmit electromagnetic radiation (EMR) to the target device using any of a wide variety of frequency bands. A location determination subsystem and/or range determination subsystem may determine a relative location, orientation, and/or rotation of the target device. For a target device within a distance range for which a smallest achievable waist of the Gaussian beam of the EMR at an operational frequency is smaller than the multi-element EMR receiver of the target device, a non-Gaussian beamform may be determined to increase efficiency, decrease overheating, reduce spillover, increase total power output of rectenna receivers on the target device, or achieve another target power delivery goal.

The present disclosure provides an electronic device including a metal frame. The metal frame provides one or more antennas including a first antenna. The range of an operating frequency band of the first antenna at least includes a 5 GHz band to allow the electronic device to support a mobile communication network.

A wireless device including a coil having loops, a first reception circuit, and a second reception circuit. The first reception circuit is configured to receive a signal of a first frequency band through a portion of the loops and the second reception circuit configured to inhibit the signal of the first frequency band through the loops.

A wireless device including a coil having loops, a first reception circuit, and a second reception circuit. The first reception circuit is configured to receive a signal of a first frequency band through a portion of the loops and the second reception circuit configured to inhibit the signal of the first frequency band through the loops.

A wideband active antenna system comprising an antenna having N outputs and a nominal bandwidth, each of the N outputs being directly coupled to an associated buffer amplifier, with a distance between the N outputs and a first active stage of each associated buffer amplifier preferably being maintained as short as reasonably possible and preferably no greater than wavelength of any transmission and/or receiving frequency of the wideband active antenna system and/or preferably no greater than 0.1 wavelength of any transmission and/or receiving frequency in an extension band of frequencies lower than a lowest frequency in the nominal bandwidth of the antenna.

A wideband active antenna system comprising an antenna having N outputs and a nominal bandwidth, each of the N outputs being directly coupled to an associated buffer amplifier, with a distance between the N outputs and a first active stage of each associated buffer amplifier preferably being maintained as short as reasonably possible and preferably no greater than wavelength of any transmission and/or receiving frequency of the wideband active antenna system and/or preferably no greater than 0.1 wavelength of any transmission and/or receiving frequency in an extension band of frequencies lower than a lowest frequency in the nominal bandwidth of the antenna.

An antenna system having a Vivaldi antenna configured to be impedance matched to antenna impedance Za at and above but not below a frequency fc; a Field-Effect-Transistor buffer coupled to the Vivaldi antenna, the length of the coupling between the antenna terminals and the buffer being of a distance much less than a wavelength at frequency fc, the buffer configured to present a high impedance at frequencies substantially <fc, the buffer output impedance further configured to be matched to a system impedance Z0 at frequencies both above and below fc.