A combiner network is provided. The combiner network may include a combiner of a first type. The combiner network may further include a combiner of a second type. The combiner of a first type includes a first plurality of waveguide ports and an H-plane combiner connected to an E-plane combiner. The combiner of the second type includes a second plurality of waveguide ports and an H-plane combiner including a U-bend.

A center-fed array antenna comprises: a central radiation element located in the center among the odd number of N radiation elements; a first radiation part including n (=(N−1)/2) first radiation elements positioned on one side of the central radiation element and n first phase shifters corresponding to each of the n first radiation elements; a second radiation part including n second radiation elements positioned on the other side of the central radiation element and n second phase shifters corresponding to each of the n second radiation elements; and a 3-way power divider distributes the received feed signal in an asymmetric ratio in proportion to the ratio of the number of radiation elements included in the central radiation element and the first and second radiation parts, and outputs the obtained first to third distribution feed signals to the corresponding central radiation element and the first and second radiation parts, respectively.

An object detection apparatus in a vehicle is provided. The object detection apparatus includes one or more sensors configured to detect at least one object located on at least three rows of seats in the vehicle, the one or more sensors being positioned on a ceiling of the vehicle. The object detection apparatus further includes a circuit configured to determine whether or not the at least one object detected is a living-object. A number of the one or more sensors is less than a number of the at least three rows of seats.

A transceiver includes an antenna configured to transmit a first wireless signal based on a transmission signal and receive a second wireless signal, the second wireless signal including a reflected first wireless signal from an object and the antenna transmitting the first wireless signal and receiving the second wireless signal at the same time. A transmission circuit is configured to generate the transmission signal and output the transmission signal to a first side of the antenna. A reception circuit is configured to receive a reception signal from a second side of the antenna, the antenna outputting the reception signal based on the second wireless signal. The first side is different from the second side.

An electronic device and an antenna structure are provided. The electronic device includes a metal housing, and the antenna structure is disposed in the metal housing. The antenna structure includes a printed circuit board, two radiating elements, two feeding transmission lines and a connector. The two radiating elements are disposed on the printed circuit board and are close to the two slots. Projections of the two radiating elements projected onto the metal housing at least partially overlap with the two slots. The two feeding transmission line are disposed in the printed circuit board. The two feeding transmission lines are electrically connected to the two radiating elements, respectively, and lengths of the two feeding transmission lines are the same. The connector is connected to the printed circuit board and electrically connected to the two feeding transmission lines.

An antenna comprising (1) a bottom RF guide plate rotatably coupled to a base via a first shaft controlled by an azimuth motor, (2) a top array plate rotatably coupled to the base via a second shaft controlled by an elevation motor, the top array plate and the bottom RF guide plate collectively forming a waveguide configured to direct RF signals in a specific direction, and (3) a choke structure coupled to the top array plate, the choke structure and the bottom RF guide plate collectively producing a RF choke that mitigates RF energy leakage or intrusion between the waveguide and an area outside the waveguide. Various other apparatuses, systems, and methods are also disclosed.

A TE20 launch guidance waveguide hybrid coupler includes a waveguide body, a cavity, a plurality of ports, and a bend along the H-plane. The waveguide body includes a hybrid center portion which is disposed between and is in direct communication with the plurality of ports. The bend along the H-Plane is defined within the hybrid center portion, assists in the launching of the TE20 mode, and results in typically half the axial ratio and mass when compared to traditional hybrid approaches.

A combiner network is provided. A combiner network may include a corporate combiner. The corporate combiner may include a first plurality of radiation elements. The corporate combiner may include a first H-plane combiner connected to the first plurality of radiation elements and connected by a U-bend to a first E-plane combiner. The corporate combiner may include a second H-plane combiner connected to the first E-plane combiner. The corporate combiner may further include a first port. A plurality of corporate combiners may be assembled together as a combiner network.

Multiband guiding structures for antennas and methods for using the same are described. In one embodiment, an antenna comprises: an antenna aperture with radio-frequency (RF) radiating antenna elements; and a center-fed, multi-band wave guiding structure coupled to the antenna aperture to receive a feed wave in two different frequency bands and propagate the feed wave to the RF radiating antenna elements of the antenna aperture.

An apparatus includes a traveling-wave antenna array comprising a plurality of adjacent metamaterial surface antennas comprising a waveguide or a cavity, each adjacent metamaterial surface antenna comprising an array of metamaterial radiators coupled to a surface of the waveguide or the cavity, each metamaterial radiator comprising an individually addressable tunable component that can be tuned over a spectral bandwidth to generate different radiation patterns. The apparatus further includes a phase diversity feed coupled to the traveling-wave antenna array and configured to provide adjustable phase diverse input to two or more of the plurality of adjacent metamaterial surface antennas, the phase diverse input comprising a first phase for a first traveling-wave antenna and a second phase for a second traveling-wave antenna, the first phase being different from the second phase, wherein the phase diverse input is-selected to suppress grating lobes for a directed beam pattern selected for transmission.