A radar measuring device for level and/or limit level monitoring is provided, including a radar signal source configured to generate and/or transmit a radar signal, an antenna arrangement configured to direct the radar signal, a plano-convex lens with a plane side configured to face a medium and to focus the radar signal, the radar measuring device being configured such that the plane side rests at least partially on a container surface and such that a contact surface is formed between the plano-convex lens and the container.

A radar measuring device for level and/or limit level monitoring is provided, including a radar signal source configured to generate and/or transmit a radar signal, an antenna arrangement configured to direct the radar signal, a plano-convex lens with a plane side configured to face a medium and to focus the radar signal, the radar measuring device being configured such that the plane side rests at least partially on a container surface and such that a contact surface is formed between the plano-convex lens and the container.

The present invention provides a phase control plate including n layers (n≥4) of overlapping admittance sheets (10-1 to 10-6) each of which includes a plurality of plane unit cells, in which an admittance of a first plane unit cell included in an admittance sheet in a layer a (1≤a≤n) and an admittance of a second plane unit cell being included in an admittance sheet in a layer b (1≤b≤n and b≠a) and overlapping the first plane unit cell are different from each other.

A resonance structure includes a conductor part that expands along a first plane including a first direction and a third direction; a ground conductor that expands along the first plane; first pair conductors that electrically connect the conductor part and the ground conductor along a second direction intersecting the first plane and face each other in the first direction; and second pair conductors that electrically connect the conductor part and the ground conductor along the second direction and face each other in the third direction. The conductor part capacitively connects the first pair conductors and capacitively connects the second pair conductors. A first edge and a second edge of the conductor part intersect with each other. The first edge extends in the first direction from one conductor of the first pair conductor. The second edge extends in the third direction from one conductor of the second pair conductors.

A radio frequency antenna array uses lenses and RF elements, to provide ground-based coverage for cellular communication. The antenna array can include two spherical lenses, where each spherical lens has at least two associated RF elements. Each of the RF elements associated with a given lens produces an output beam with an output area. Each lens is positioned with the other lenses in a staggered arrangement. The antenna includes a control mechanism configured to enable a user to move the RF elements along their respective tracks, and automatically phase compensate the output beams produced by the RF elements based on the relative distance between the RF elements.

A radio frequency antenna array uses lenses and RF elements, to provide ground-based coverage for cellular communication. The antenna array can include two spherical lenses, where each spherical lens has at least two associated RF elements. Each of the RF elements associated with a given lens produces an output beam with an output area. Each lens is positioned with the other lenses in a staggered arrangement. The antenna includes a control mechanism configured to enable a user to move the RF elements along their respective tracks, and automatically phase compensate the output beams produced by the RF elements based on the relative distance between the RF elements.

An antenna system and a processing method are provided. The antenna system includes a focus device and a multi-band feeding antenna array that is disposed in a focus area of the focus device, where the multi-band feeding antenna array includes antenna arrays on at least two frequency bands, the antenna arrays on the at least two frequency bands include at least an antenna array on a first target frequency band, the antenna array on the first target frequency band includes multiple feeding units that are arranged in a form of a non-one-dimensional linear array; the multi-band feeding antenna array is configured to radiate a first beam, where the first beam points to the focus device, and sub-beams separately generated by the antenna arrays on the at least two frequency bands constitute the first beam.

An antenna system and a processing method are provided. The antenna system includes a focus device and a multi-band feeding antenna array that is disposed in a focus area of the focus device, where the multi-band feeding antenna array includes antenna arrays on at least two frequency bands, the antenna arrays on the at least two frequency bands include at least an antenna array on a first target frequency band, the antenna array on the first target frequency band includes multiple feeding units that are arranged in a form of a non-one-dimensional linear array; the multi-band feeding antenna array is configured to radiate a first beam, where the first beam points to the focus device, and sub-beams separately generated by the antenna arrays on the at least two frequency bands constitute the first beam.

A radio frequency antenna array uses lenses and RF elements, to provide ground-based coverage for cellular communication. The antenna array can include a spherical lens, where each spherical lens has at least two associated RF elements. Each of the RF elements associated with a given lens produces an output beam with an output area. The antenna includes a control mechanism configured to enable a user to move the RF elements along their respective tracks, and automatically phase compensate the output beams produced by the RF elements based on the relative distance between the RF elements.

Complementary metamaterial elements provide an effective permittivity and/or permeability for surface structures and/or waveguide structures. The complementary metamaterial resonant elements may include Babinet complements of “split ring resonator” (SRR) and “electric LC” (ELC) metamaterial elements. In some approaches, the complementary metamaterial elements are embedded in the bounding surfaces of planar waveguides, e.g. to implement waveguide based gradient index lenses for beam steering/focusing devices, antenna array feed structures, etc.