A radar device for a vehicle, according to an embodiment of the present invention, comprises: a case; a first printed circuit board (PCB) that is accommodated in the case and has a plurality of antenna arrays and an integrated circuit (IC) chip that are formed thereon, wherein the IC chip is connected to the plurality of antenna arrays; and a radome that is coupled to the case and covers the first printed circuit board, wherein the radome includes: a cover facing the first printed circuit board; a first wall connected to the cover surface; and a second wall connected to the cover and facing the first wall, wherein the internal angle between the cover and the first wall and the internal angle between the cover and the second wall are formed to be greater than 90° and less than 180°.

A communication system includes at least one terminal device for acquiring at least information about a battery; and at least one management device. The management device communicates with the terminal device. One of the management device and the terminal device includes a multi-band communication device configured to perform communication using plural, different frequency bands. The other of the management device and the terminal device includes a specific communication device configured to perform communication using at least one frequency band among the plural, different frequency bands.

A roof antenna for a vehicle has a cover that is connected to a baseplate via a latching unit. The latching unit comprises latching hooks that releasably engage behind elastic latching lugs.

A monocone antenna is described for V2X wireless communications. To achieve ultrawide bandwidth, low-profile, omnidirectional radiation, an implementation comprises various components including a circular monocone, a capacitive feed, a ring with grounding vias, capacitive bars, and conductive cylinders. Another implementation comprises a monocone, a capacitive feed, a ground ring with grounding vias, a plurality of first meander lines, each having a first size, and a plurality of second meander lines each having a second size, wherein the second size is larger than the first size.

A monocone antenna is described for V2X wireless communications. To achieve ultrawide bandwidth, low-profile, omnidirectional radiation, an implementation comprises various components including a circular monocone, a capacitive feed, a ring with grounding vias, capacitive bars, and conductive cylinders. Another implementation comprises a monocone, a capacitive feed, a ground ring with grounding vias, a plurality of first meander lines, each having a first size, and a plurality of second meander lines each having a second size, wherein the second size is larger than the first size.

[Object]

To improve accuracy of transmission and reception in antennas.

[Solving Means]

A radar apparatus includes multiple antennas, a power feeding circuit, and dummy antennas. The multiple antennas have a predetermined length in a first direction and are arranged in an array form in a second direction that intersects the first direction. The power feeding circuit is connected to the multiple antennas. The dummy antennas have a length different from the predetermined length and are arranged so as to sandwich the multiple antennas in the second direction.

[Object]

To improve accuracy of transmission and reception in antennas.

[Solving Means]

A radar apparatus includes multiple antennas, a power feeding circuit, and dummy antennas. The multiple antennas have a predetermined length in a first direction and are arranged in an array form in a second direction that intersects the first direction. The power feeding circuit is connected to the multiple antennas. The dummy antennas have a length different from the predetermined length and are arranged so as to sandwich the multiple antennas in the second direction.

An antenna structure, a radar, and a terminal may be applied to the field of millimeter-wave radars and can extend a 3 dB bandwidth of the antenna structure. The antenna structure includes: A main feeder and at least one patch unit group, where the at least one patch unit group is connected in series to the main feeder in a length direction of the main feeder, and each of the at least one patch unit group includes at least two patch units disposed in a V-shaped structure. Each patch unit group is connected in series to the main feeder through the two patch units that are disposed in the V-shaped structure and that are in each patch unit group.

An antenna system for vehicles includes a first antenna attached in a vicinity of a windshield of a vehicle; and a second antenna attached in a vicinity of a rear glass of the vehicle, wherein the first antenna and the second antenna are configured to transmit and receive an electromagnetic wave in a predetermined frequency band F, and wherein defining a region A and a region B with respect to a vehicle center axis extending in a traveling direction of the vehicle, so as to bisect a vehicle width of the vehicle from a viewpoint in a direction normal to a horizontal plane, the first antenna is arranged in the region A, and the second antenna is arranged in the region B.

A radar system includes a transmitter including a power amplifier (PA) for amplifying a local oscillator (LO) signal, to generate an amplified signal. The radar system also includes a receiver including an IQ generator for generating an I signal based on the LO signal and for generating a Q signal based on the LO signal and a low noise amplifier (LNA) for amplifying a looped back signal, to generate a receiver signal. The receiver also includes a first mixer for mixing the receiver signal and the I signal, to generate a baseband I signal and a second mixer for mixing the receiver signal and the Q signal, to generate a baseband Q signal. Additionally, the radar system includes a waveguide loopback for guiding the amplified signal from the transmitter to the receiver as the looped back signal.