An antenna device includes a housing defining an interior cavity, a UHF antenna element, two VHF antenna elements and two WiFi antenna elements. The antenna elements are mounted to the housing and are selectively adjustable between a vertical, upright position and a folded, horizontal position. The antenna elements are situated on the housing to provide an omni-directional antenna pattern for receiving broadcast signals. Antenna circuitry provided within the interior cavity of the housing receives signals from the antenna elements and generates an output signal that is provided to at least one output connector mounted on the housing or on one or more signal cables extending therefrom and to an external electronic device connected thereto.

An LED lighting device includes a light emitting assembly including at least one LED and a wireless network interface connecting the LED lighting device to a network. The wireless network interface includes a RF transceiver. An antenna is in electrical communication with the RF transceiver. A thermally conductive housing receives the light emitting assembly, the thermally conductive housing in thermal communication with the at least one LED. In one aspect the thermally conductive housing is formed of a thermally conductive and electrically nonconductive material. In another aspect, the thermally conductive housing includes a first portion attached to a second portion, wherein the first portion is formed of a first, thermally conductive material and defines an interior cavity receiving the wireless network interface. The second portion is formed of a second, electrically nonconductive material and defines an aperture allowing optical output of the at least one LED to pass therethrough.

This invention is an antenna structure inducing plasma in a chamber with applied alternative power, comprising: a first antenna segment and a second antenna segment arranged based on a virtual central axis to have a first curvature radius and a second curvature radius respectively, the central axis crossing a first plane, and a first capacitive load electrically connecting the first antenna segment and the second antenna segment, wherein the first antenna segment extends from one end of the first capacitive load with the first curvature radius having a first length and the second antenna segment extends from other end of the first capacitive load with the second curvature radius having a second length, and wherein a sum of the first length and the second length is shorter than a circumference of the first curvature radius or the second curvature radius.

This invention is an antenna structure inducing plasma in a chamber with applied alternative power, comprising: a first antenna segment and a second antenna segment arranged based on a virtual central axis to have a first curvature radius and a second curvature radius respectively, the central axis crossing a first plane, and a first capacitive load electrically connecting the first antenna segment and the second antenna segment, wherein the first antenna segment extends from one end of the first capacitive load with the first curvature radius having a first length and the second antenna segment extends from other end of the first capacitive load with the second curvature radius having a second length, and wherein a sum of the first length and the second length is shorter than a circumference of the first curvature radius or the second curvature radius.

An antenna stand for holding a flexible or non-flexible planar antenna includes a base and support frame. The support frame includes two spaced apart legs and a horizontal cross member interposed therebetween. At least two lower antenna supports are provided on the support frame on which the bottom edge of the planar antenna may rest. An optional extendable antenna holding arm includes an upper antenna clip that engages the top edge of the planar antenna. The extendable antenna holding arm support is adjustably mounted to the support frame so that the distance between the lower antenna supports and the upper antenna clip can be varied to accommodate planar antennas of varying dimensions. The support frame may be arcuately shaped transversely to impart a slight lateral bend to a flexible planar antenna mounted on the stand. This helps to maintain the flexible planar antenna in an upright position on the stand.

An antenna stand for holding a flexible or non-flexible planar antenna includes a base and support frame. The support frame includes two spaced apart legs and a horizontal cross member interposed therebetween. At least two lower antenna supports are provided on the support frame on which the bottom edge of the planar antenna may rest. An optional extendable antenna holding arm includes an upper antenna clip that engages the top edge of the planar antenna. The extendable antenna holding arm support is adjustably mounted to the support frame so that the distance between the lower antenna supports and the upper antenna clip can be varied to accommodate planar antennas of varying dimensions. The support frame may be arcuately shaped transversely to impart a slight lateral bend to a flexible planar antenna mounted on the stand. This helps to maintain the flexible planar antenna in an upright position on the stand.

A lighting control system comprises a smart device, at least one luminaire assembly, and a server. A user operates a client app installed on the smart device to communicatively with the server to further control the at least one luminaire assembly. The server comprises a database module, a brightness control module for implementing automatic brightness variations, a mode switching module for cooperating with at least sensor disposed in the at least one luminaire assembly to implement different ambient lighting controls, and a brightness compensation module for cooperating with a light sensor disposed on the smart device to implement ambient lighting control.

According to an embodiment of the present disclosure, An antenna structure disposed around a side perimeter of a discharging tube providing a space in which a plasma is generated may be provided. The antenna structure comprises n unit antennas, each of n unit antennas comprises: a first arc section, having a first radius of curvature, a second arc section, having a second radius of curvature, and an arc connecting section connecting the first arc section and the second arc section, and m-th unit antenna and (m+1)-th unit antenna adjacent to each other are disposed so that an angle formed by an arc connecting section of the m-th unit antenna and an arc connecting section of the (m+1)-th unit antenna in basis of the center of the discharging tube is 360/n degree.

According to an embodiment of the present disclosure, An antenna structure disposed around a side perimeter of a discharging tube providing a space in which a plasma is generated may be provided. The antenna structure comprises n unit antennas, each of n unit antennas comprises: a first arc section, having a first radius of curvature, a second arc section, having a second radius of curvature, and an arc connecting section connecting the first arc section and the second arc section, and m-th unit antenna and (m+1)-th unit antenna adjacent to each other are disposed so that an angle formed by an arc connecting section of the m-th unit antenna and an arc connecting section of the (m+1)-th unit antenna in basis of the center of the discharging tube is 360/n degree.

A communication device includes a first FSS (Frequency Selective Surface) element, a second FSS element, a feeding radiation element, a first electron gun, and a first electron collector. The second FFS element is adjacent to the first FSS element. The feeding radiation element generates an electromagnetic signal. The electromagnetic signal is propagated by using the first FSS element and the second FSS element. The first electron gun transmits a first electron beam. The first electron collector receives the first electron beam. An antenna structure is formed by the first FSS element, the second FSS element, and the feeding radiation element. A coupling effect is induced between the first electron beam and the electromagnetic signal, such that the radiation energy of the electromagnetic signal is enhanced.