Antennas such as flat panel, leaky wave antennas with directional coupler feeds and waveguides are disclosed. In one example, an antenna includes a surface having antenna elements, a guided wave transmission line, and a coupling surface. The guided wave transmission line provides a guided feed wave. The coupling surface is between and separates the guided wave transmission line and the surface having antenna elements. The coupling surface controls coupling of the guided feed wave to the antenna elements. The coupling surface can also spatially filter the guided feed wave to provide a more uniform power density for the antenna elements. The guided feed wave can be a high power density electromagnetic wave or a density radially decaying electromagnetic wave.

A filter module for multiple carrier aggregation includes a substrate, a first filter and a second filter disposed on a first side of the substrate, and a metallic ground trace substantially bisecting the surface of the substrate into first and second substrate sections, such that the first filter is disposed on the first substrate section and the second filter is disposed on the second substrate section and a method of improving cross isolation in a multiple carrier aggregation filter module including a first filter disposed on a substrate for passing a first LTE band and a second filter disposed on the substrate for passing a second LTE band having a neighboring frequency to the first LTE band, the method including bisecting the substrate with a metallic trace such that the first filter is on a different section of the substrate to the second filter.

An antenna array that utilizes ground guard rings and metamaterial structures is disclosed. In certain embodiments, the antenna array is constructed from a plurality of antenna unit cells, wherein each antenna unit cell is identical. The antenna unit cell comprises a top surface, that contains a patch antenna and a ground guard ring. A reactive impedance surface (RIS) layer is disposed beneath the top surface and contains the metamaterial structures. The metamaterial structures are configured to present an inductance to the patch antennas, thereby allowing the patch antennas to be smaller than would otherwise be possible. In some embodiments, the metamaterial structures comprise hollow square frames. An antenna array constructed using this antenna unit cell has less coupling than conventional antenna arrays, which results in better performance. A ground skirt surrounds the perimeter of the antenna array to improve radiation phase pattern balance within the array.

An antenna array that utilizes ground guard rings and metamaterial structures is disclosed. In certain embodiments, the antenna array is constructed from a plurality of antenna unit cells, wherein each antenna unit cell is identical. The antenna unit cell comprises a top surface, that contains a patch antenna and a ground guard ring. A reactive impedance surface (RIS) layer is disposed beneath the top surface and contains the metamaterial structures. The metamaterial structures are configured to present an inductance to the patch antennas, thereby allowing the patch antennas to be smaller than would otherwise be possible. In some embodiments, the metamaterial structures comprise hollow square frames. An antenna array constructed using this antenna unit cell has less coupling than conventional antenna arrays, which results in better performance. Furthermore, this new antenna array also requires less space than conventional antenna arrays.

A method for constructing a multifunctional antenna structure configured to generate a plurality of radiation patterns includes determining a desired source field associated with the plurality of radiation patterns, and receiving feed locations for a waveguide to an antenna aperture surface. The method may further include placing a metasurface resonator at a first resonator location that exhibits a minimum error relative to the desired source field and satisfies a maximum error threshold relative to the desired source field. The metasurface resonator may be determined based on the feed locations and a plurality of degrees of freedom for the first resonator location. The method may also include discarding a second resonator location in response to determining that no metasurface resonator at the second resonator location satisfies the maximum error threshold. The plurality of degrees of freedom may include metasurface resonator geometries that exhibit different polarizabilities defined in a candidate library.

An occupancy detection system for at least one vehicle seat includes: an antenna arrangement having an antenna; a control device that applies a radio-frequency transmission signal to, and receives a response signal from, the antenna arrangement; and a transmit array having a plurality of structured metallic layers disposed above each other and extending laterally, each two neighbouring metallic layers isolated from each other by an intermediate dielectric layer. The antenna arrangement transmits a radio-frequency transmission field through the transmit array onto the vehicle seat in response to the transmission signal and receives a radio-frequency response field through the transmit array to generate the response signal. The transmit array is adapted to refract at least one of the transmission field and the response field. The transmit array has a receive section that focuses a response field from a position of a vehicle seat to a position of a receive antenna.

A two-port antenna system is proposed that uses a polarization-independent spatial power divider to align the beams from two orthogonally oriented dual-polarized feeds. This antenna system is compatible with fully polarimetric radar and provides high port isolation. It simultaneously provides a common aperture for transmit and receive to minimize radar parallax. The spatial power divider is designed using a combination of all-dielectric metamaterial techniques and the concept of miniaturized-element frequency selective surfaces, and is fabricated on a silicon wafer using standard microfabrication technology.

An antenna array that utilizes ground guard rings and metamaterial structures is disclosed. In certain embodiments, the antenna array is constructed from a plurality of antenna unit cells, wherein each antenna unit cell is identical. The antenna unit cell comprises a top surface, that contains a patch antenna and a ground guard ring. A reactive impedance surface (RIS) layer is disposed beneath the top surface and contains the metamaterial structures. The metamaterial structures are configured to present an inductance to the patch antennas, thereby allowing the patch antennas to be smaller than would otherwise be possible. In some embodiments, the metamaterial structures comprise hollow square frames. An antenna array constructed using this antenna unit cell has less coupling than conventional antenna arrays, which results in better performance. Furthermore, this new antenna array also requires less space than conventional antenna arrays.

A scattering device 10 is described comprising a plurality of dipoles 20, each comprising a rod and a pair of plates 12, 22, the plates 12, 22 being located at the respective ends of the rod, the rods of the dipoles 20 being connected to one another and arranged such that the rods are angled relative to one another.

Provided is an antenna device including a feeding antenna conductor, a non-feeding antenna conductor, a ground conductor, and an artificial magnetic conductor disposed between the feeding antenna conductor and the non-feeding antenna conductor, and the ground conductor. The antenna device further includes a conductor that electrically connects the artificial magnetic conductor to the ground conductor. The conductor is disposed at a position opposite to the feeding antenna conductor with respect to the non-feeding antenna conductor, and is separated from the non-feeding antenna conductor.