A multiband antenna includes a feeding element connected to a feeding point, a radiating element functioning as a radiating conductor, the radiating element being positioned apart from the feeding element and fed with electric power by electromagnetically coupling to the feeding element, a ground plane, and a non-feeding element being positioned close to the radiating element and connected to the ground plane via a reactance element. The reactance element has a reactance that causes the multiband antenna to match with a frequency other than a resonance frequency of a resonance mode of the radiating element.

A multiband antenna includes a feeding element connected to a feeding point, a radiating element functioning as a radiating conductor, the radiating element being positioned apart from the feeding element and fed with electric power by electromagnetically coupling to the feeding element, a ground plane, and a non-feeding element being positioned close to the radiating element and connected to the ground plane via a reactance element. The reactance element has a reactance that causes the multiband antenna to match with a frequency other than a resonance frequency of a resonance mode of the radiating element.

A collapsible ground plane for a mobile UHF satcom antenna mounted on a riser comprises a hub and a plurality of conductive members, some of which extend radially from the hub with additional conductive members that extend peripherally between adjacent distal ends of the radially extending conductive members. Each conductive member is flexible so as to yield upon an impact, and return to its original shape when the impact is relieved.

A collapsible ground plane for a mobile UHF satcom antenna mounted on a riser comprises a hub and a plurality of conductive members, some of which extend radially from the hub with additional conductive members that extend peripherally between adjacent distal ends of the radially extending conductive members. Each conductive member is flexible so as to yield upon an impact, and return to its original shape when the impact is relieved.

A wireless communication device for use in a load control system for controlling one or more electrical loads may comprise a counterpoise, a first and second antennas, a RF communication circuit and a control circuit. The two antennas may be oriented differently and spaced apart from each other. For example, the first antenna may extend perpendicularly from the counterpoise while the second antenna extends in a plane substantially parallel to the counterpoise. The first antenna may extend from the counterpoise at a point substantially central to the counterpoise while the second antenna may extend along a perimeter of the counterpoise. The RF communication circuit may transmit wireless signals via the first and second antennas. The control circuit may cause the RF communication circuit to transmit a first wireless signal in a first time slot and a second wireless signal in a second time slot.

Provided is an antenna device having a structure that suppresses deterioration in performance as a profile becomes lower. Four FM band antenna elements and two AM band antenna elements are arranged side by side on an antenna base. Further, a circuit board including synthesis circuits in one-to-one correspondence with the antenna elements, respectively, is arranged in an inner space of the antenna elements. In order that omnidirectionality may be exhibited in a horizontal plane, each of the antenna elements includes a helically wound linear conductor, and a planar conductor that is electrically connected to the linear conductor at a part substantially the farthest from a ground plane (antenna base.

A dual-band dipole antenna includes a substrate, grounding area, main radiator, grounding point and a feed-in point. The grounding point may be disposed on the substrate. The main radiator may be disposed on the substrate and in the vicinity of the grounding point; the main radiator may comprises a first radiator and a second radiator, wherein the first radiator may be connected to the second radiator, and there may be a groove between the first radiator and the second radiator; besides the size of the main radiator is disproportional to the size of the grounding area. The grounding point may be disposed on the substrate and connected to the grounding area. The feed-in point may be disposed on the substrate and connected to the main radiator; the grounding point may be in the vicinity of the feed-in point.

A dual-band dipole antenna includes a substrate, grounding area, main radiator, grounding point and a feed-in point. The grounding point may be disposed on the substrate. The main radiator may be disposed on the substrate and in the vicinity of the grounding point; the main radiator may comprises a first radiator and a second radiator, wherein the first radiator may be connected to the second radiator, and there may be a groove between the first radiator and the second radiator; besides the size of the main radiator is disproportional to the size of the grounding area. The grounding point may be disposed on the substrate and connected to the grounding area. The feed-in point may be disposed on the substrate and connected to the main radiator; the grounding point may be in the vicinity of the feed-in point.

Wireless communication device (WCD) for use in an unmanned aerial vehicle (UAV) includes a multi-purpose WCD accessory. The accessory is comprised of a first plate having opposed first and second major faces. The first major face includes a heat transfer surface configured to contact a body of the WCD interior of the UAV when the WCD is secured to the first major face. A second plate is attached to the second major face in a cantilever configuration and extends exterior of the fuselage in a direction away from the second major surface. The second plate comprises at least a portion of a ground plane for an antenna system utilized by the WCD, and together with the first plate forms a heat sink for the WCD.

The invention provides a lighting device (104) and a luminaire (200). The lighting device comprises a light emitter (110) thermally connected to a heat sink (120). The lighting device further comprises a communication circuit (130) coupled to the heat sink for transmitting and/or receiving a communication signal. A first conductive part (122) of the heat sink comprises at least a first pole (142) of a dipole antenna (140) for transmitting and/or receiving the communication signal via the heat sink. This first pole of the dipole antenna may be induced via a primary radiator (160) to activate the gap (170).