A reflective target plate for mounting on a floating roof of a tank for ensuring satisfactory reflection of radar signals emitted from a radar level gauge towards the floating roof. The plate comprises a plurality of elongated grooves, each formed by two flat, radar reflective surfaces facing each other, normals of the surfaces being perpendicular to each other. A first set of elongated grooves has grooves extending with their longitudinal axis in a first direction, and a second set of elongated grooves has grooves extending with their longitudinal axis in a second direction, the first and second directions being perpendicular to each other.

The target plate will sufficiently reflect circularly polarized radar and linearly polarized radar will be equally reflected regardless of the rotation of the plate. This will facilitate installation, as the orientation of the plate becomes less critical.

An antenna method and apparatus for a Radio Frequency Identification (RFID) reader includes an RFID reader, a plurality of radio ports of the RFID reader, and a plurality of linearly polarized antenna elements coupled to the radio ports, wherein the RFID reader directs the radio ports to sequentially communicatively connect only one antenna element at a time to the RFID reader such that only one antenna element is operable to transmit/receive at any instant in time. The antenna elements are mounted in an alternating vertically polarized and horizontally polarized configuration.

An identification or messaging system is provided that has embodiments including a embodiment with a structure with different faces and a base with reflective or resonance panels which are positioned at different receiving angles to detect direct signals and amplify them including in a sequence to be detected by an active emitter that emits electromagnetic radiation that is reflected and steered or resonated off or with the panels. An emitter can be an aerial platform with the emitter and a library of reflected or resonated signals that are associated with a particular sequence of panels on the structure which are associated with a particular entity identification or message. Thermal patterned and/or magnetic patterned panels (e.g., for backplane beamforming) and return signal steering can also be provided. Embodiments with secondary signaling systems can also be provided. A variety of various embodiments and methods are also provided.

The invention is directed to a cavity backed dipole antenna that has at least a reduced length relative to a reference dipole antenna at the same first frequency of operation and, in some embodiments, an improved bandwidth relative to a reference dipole antenna. In one embodiment, the cavity backed dipole antenna comprises a driven bowtie dipole antenna and a parasitic folded sheet dipole antenna with the driven bowtie dipole antenna located with a boundary defined by the parasitic folded sheet dipole antenna.

A multiple input, multiple output (“MIMO”) antenna system is provided for operation on a radio frequency (“RF”) module that may be used in a wireless access device. The MIMO antenna system includes a plurality of multi-band antenna elements connected to a radio in a MIMO configuration. The multi-band antenna elements and the radio are configured to operate on an RF module. A reflector is formed on the RF module to contain the plurality of multi-band antenna elements and a common director is positioned in front of the multi-band antenna elements to concentrate signal communication in a sector. The plurality of multi-band antenna elements are oriented to provide a sector coverage pattern formed by beam patterns generated by each of the multi-band antenna elements.

An antenna apparatus has a dielectric substrate and conductors. The antenna apparatus includes an antenna element which is arranged on a main surface of the dielectric substrate and has directivity ahead of the main surface, and a directional characteristic control member which includes a sidewall part which projects ahead of the main surface on at least one side of directivity of the antenna element with respect to the antenna element, and a roof part which projects in a direction of the antenna element from the sidewall part at a predetermined angle of more than 70° and less than 120° with respect to the sidewall part so that orthogonal projection to the main surface does not reach the antenna element, to reflect or absorb radio waves.

Network hardware devices organized in a Wireless mesh network (WMN) in which the network hardware devices cooperate in distribution of content files to client consumption devices in an environment of limited connectivity to broadband Internet infrastructure are described. One mesh network device includes a housing including reflective chambers within with multiple antennas are disposed. A first radio is operable to cause a first antenna to radiate electromagnetic energy in a first frequency range and a first reflector chamber is operable to reflect the electromagnetic energy in a first direction away from the housing. Second, third, and fourth radios are operable to cause the respective antennas within the respective reflective chambers to radiate electromagnetic energy and the respective reflective chamber is to reflect the electromagnetic energy in a respective direction away from the housing.

An antenna array assembly comprises a ground plate, an array of radiator elements disposed in a spaced relationship with a first face of the ground plate between first and second substantially parallel conductive walls projecting from the first face of the ground plate, and a first and second conductive plate. Each of the first and second conductive plates is electrically isolated from the ground plate, and each is disposed in an upstanding relationship to the first face of the ground plate in a substantially parallel relationship with the first and second conductive walls. This provides reduced radiation in at least one direction in the hemisphere on the opposite side of the ground plate to the first face.

Provided is a radar and light emission assembly for emitting light and radar radiation and for detecting at least reflected radar radiation including: a headlight including a light-transparent headlight cover, and a light source, and a light reflector; a radar module, which is arranged behind the headlight cover, integrated in the headlight and including a radar antenna unit. The radar and light emission assembly has at least one radar radiation-forming mechanism, in particular a frequency-selective radar radiation-forming mechanism, including a radar radiation-forming mechanism, which is integrated in the headlight cover. The application of the radar technology, integrated in the headlight, can be further optimized hereby. The invention further relates to a method and a use for a radar and light emission assembly of this type.

A base station antenna comprises a plurality of columns of first radiating elements configured for operating in a first operational frequency band, each column of first radiating elements comprising a plurality of first radiating elements arranged in a longitudinal direction and an isolation wall positioned between adjacent columns of first radiating elements and extending in the longitudinal direction. The isolation wall comprises a frequency selective surface configured such that electromagnetic waves within the first operational frequency band are substantially blocked by the isolation wall.