In an electromagnetic wave generation device including a plurality of electromagnetic wave generation elements, an instantaneous maximum power consumption during an electromagnetic wave generation operation is reduced. Specifically, the electromagnetic wave generation device includes a plurality of electromagnetic wave generation elements that are divided into a plurality of groups, and a control unit that causes the plurality of electromagnetic wave generation elements to oscillate while shifting a timing in units of group. For example, the control unit causes the plurality of electromagnetic wave generation elements to oscillate such that when the number of the plurality of groups is n, an oscillation start timing of the group that performs mth oscillation (m is a natural number equal to or larger than 2 and equal to or smaller than n) is the same timing as or after an oscillation end timing of the group that performs (m−1)th oscillation.

In an electromagnetic wave generation device including a plurality of electromagnetic wave generation elements, an instantaneous maximum power consumption during an electromagnetic wave generation operation is reduced. Specifically, the electromagnetic wave generation device includes a plurality of electromagnetic wave generation elements that are divided into a plurality of groups, and a control unit that causes the plurality of electromagnetic wave generation elements to oscillate while shifting a timing in units of group. For example, the control unit causes the plurality of electromagnetic wave generation elements to oscillate such that when the number of the plurality of groups is n, an oscillation start timing of the group that performs mth oscillation (m is a natural number equal to or larger than 2 and equal to or smaller than n) is the same timing as or after an oscillation end timing of the group that performs (m−1)th oscillation.

Example slot antennas for electronic user device and related methods are disclosed herein. An example electronic user device includes a first housing; a second housing rotatably coupled to the first housing; a display screen carried by the second housing; a dual-band antenna carried by the second housing; and a bezel about the display screen, the bezel to cover the dual-band antenna.

Example slot antennas for electronic user device and related methods are disclosed herein. An example electronic user device includes a first housing; a second housing rotatably coupled to the first housing; a display screen carried by the second housing; a dual-band antenna carried by the second housing; and a bezel about the display screen, the bezel to cover the dual-band antenna.

A multi-band antenna is provided that includes a ground plane, a first lower frequency antenna radiator including one or more outer conductive elements surrounding an interior void and a first higher frequency antenna radiator including one or more interior conductive elements surrounded by an exterior void. The multi-band antenna also includes a first lower frequency antenna feed including one or more outer conductive elements surrounding at least partially an interior void and a first higher frequency antenna feed including one or more interior conductive elements surrounded at least partially by an exterior void. The multi-band antenna further includes at least one lower frequency interface and at least one higher frequency interface. The at least one lower frequency interface is for the first lower frequency feed and the at least one higher frequency interface is for the higher frequency feed.

A base station antenna comprises an array of radiating elements configured to emit electromagnetic radiation and an RF lens positioned to receive the electromagnetic radiation. The RF lens has a first surface facing the array of radiating elements and a second surface opposite the first surface. The RF lens is divided into a plurality of portions that extend from the first surface to the second surface, respectively, the plurality of portions having respective refractive indices for the electromagnetic radiation, wherein the plurality of portions are arranged, in a width direction of the RF lens, such that a first of the plurality of portions having the highest refractive index is in a middle portion of the radio frequency lens and others of the plurality of portions having lower refractive indices are on either side of the first of the plurality of portions.

A radiating system comprises a radiating structure, first and second external ports, and a radiofrequency system. The radiating structure comprises a ground plane layer including a connection point, a single radiation booster including a connection point, and a first internal port defined between the connection points of the single radiation booster and the ground plane layer. The first and second external ports each provide operation in at least one frequency band. The radiofrequency system includes a first port connected to the first internal port of the radiating structure, and second and third ports respectively connected to the first and second external ports.

A radiating system comprises a radiating structure, first and second external ports, and a radiofrequency system. The radiating structure comprises a ground plane layer including a connection point, a single radiation booster including a connection point, and a first internal port defined between the connection points of the single radiation booster and the ground plane layer. The first and second external ports each provide operation in at least one frequency band. The radiofrequency system includes a first port connected to the first internal port of the radiating structure, and second and third ports respectively connected to the first and second external ports.

A lighting system includes a plurality of lighting devices installed in a predetermined space and connected to one another to communicate with one another using at least one of a first communication method and a second communication method, and a mobile device directly connected to at least one of the plurality of lighting devices to communicate therewith according to the first communication method. The first communication method and the second communication method are different. Each of the plurality of lighting devices includes a communication module configured to support the first communication method and the second communication method, and a driver configured to drive a light source in response to a control command received by the communication module.

A radiating system of a wireless device transmits and receives electromagnetic wave signals in a frequency region and comprises an external port, a radiating structure, and a radiofrequency system. The radiating structure includes: a ground plane layer with a connection point; a radiation booster with a connection point and being smaller than 1/30 of a free-space wavelength corresponding to a lowest frequency of the frequency region; and an internal port between the radiation booster connection point and the ground plane layer connection point. The radiofrequency system includes: a first port connected to the radiating structure's internal port; and a second port connected to the external port. An input impedance at radiating structure's disconnected internal port has a non-zero imaginary part across the frequency region. The radiofrequency system modifies impedance of the radiating structure to provide impedance matching to the radiating system within the frequency region at the external port.