An antenna device includes a housing and a printed antenna. The housing includes a front glass shell, a rear glass shell, and a metal bracket. The metal bracket is between the front glass shell and the rear glass shell, and the metal bracket is connected to outer peripheries of the front glass shell and the rear glass shell to form an accommodation space together. The metal bracket includes a first frame portion, a second frame portion, and an opening, and the opening is defined between the first and second frame portions. The printed antenna is arranged in the housing and between the first and second frame portions, and the opening exposes at least a portion of the printed antenna.

A gradient permittivity film comprises (a) a first permittivity layer comprising a first continuous matrix of a first material having a first relative permittivity (ε.sub.r1) and a second component having a second relative permittivity (ε.sub.r2) dispersed in the first continuous matrix, the first permittivity layer having a first effective layer relative permittivity (ε.sub.1) and a thickness (T.sub.1); And (b) a second permittivity layer having a second effective layer relative permittivity (ε.sub.2) and a thickness (T.sub.2) disposed on the first permittivity layer. T.sub.1=0.8(t.sub.1) to 1.2(t.sub.1), where

[00001]$t_1=\frac{c}{4f\sqrt{{\epsilon }_1}};T_2=0.8\left(t_2\right)\mathrm{to}1.2\left(t_2\right),\mathrm{where}{t}_2=\frac{c}{4f\sqrt{{\epsilon }_2}}.$

The radar cross section (RCS) of a vehicle/antenna combination is reduced by using an antenna and ground plane which are of substantially the same area, and using a frequency selective surface (FSS) in the regions on the periphery of the ground plain where the FSS is designed to be transparent and thereby pass out-of-band frequencies, while reflecting one or more operating frequencies of the antenna. A multilayer absorber below the FSS absorbs the out-of-band frequencies that a larger ground plane may have otherwise reflected to the body of the vehicle to which the antenna is mounted.

The invention provides a mobile terminal, a glass housing, and a performance optimization method of an antenna module of the mobile terminal. The mobile terminal is internally provided with the antenna module. The glass housing includes a radiation zone facing the antenna module and a non-radiation zone adjacent to the radiation zone. The glass shape of the radiation zone and the glass shape of the non-radiation zone are of discontinuity. The glass housing of the mobile terminal provided by the invention can optimize performance of the antenna module.

A radar device comprises an antenna portion, a radome, and a housing. The antenna portion includes an antenna surface provided with one or more antennas, the antenna emitting a radio wave. The radome is made of a material allowing passage of the radio wave emitted by the antenna portion, and is disposed to face the antenna surface. The housing forms, together with the radome, a space for accommodating the antenna portion. The housing includes a peripheral edge which surrounds the antenna surface and is in contact with the radome, at least part of the peripheral edge includes a barrier part which protrudes outward from the radome along the antenna surface.

An antenna and a radome that covers the antenna are provided, the radome includes a first part, a second part, and a third part each with a surface which is flush to each other, the first part has a beam transmission characteristic corresponding to a scanning angle of 0 degrees of a beam emitted by the antenna with an emission direction directed toward the first part, the second part has a beam transmission characteristic corresponding to a first scanning angle of a beam emitted by the antenna with an emission direction directed toward the second part, and the third part has a beam transmission characteristic corresponding to a second scanning angle of a beam emitted by the antenna with an emission direction directed toward the third part.

The application discloses a wideband dual-polarized antenna, including a reflective plate and a radiating element mounted on the reflective plate. The radiating element includes four dipoles which are combined together to be arranged on the reflective plate; two arms of each dipole are respectively connected to top ends of two conductor, and bottom ends of the conductor are connected to a common base and are placed on the reflective plate; a focusing member with a conical structure is mounted above the radiating element, and includes conductive members and dielectric members. The conductive members are arranged on the dielectric members in an axisymmetrical manner, are supported by the dielectric members and are arranged above the dipoles. The beamwidth is adjusted by arranging the focusing member with the conical structure above the radiating element so that the wideband dual-polarized antenna has the beamwidth reaching the desired range, has lower cross polarization ratio.

For example, a system may include a radome to be attached to a vehicle bumper fascia; an antenna array on a Printed Circuit Board (PCB), the antenna array is between the PCB and the radome, the antenna array comprising a Transmit (Tx) antenna configured to transmit Tx radar signals via the radome and the vehicle bumper fascia, and a receive (Rx) antenna configured to receive Rx radar signals based on the Tx radar signals; and an absorbing spacer in a spacer area between the PCB and the radome, the spacer area separating the Tx antenna from the Rx antenna, the absorbing spacer configured to absorb reflected signals formed by reflection of the Tx radar signals from the vehicle bumper fascia.

An electronic device is provided. The electronic device includes a metal housing, an insulation element, and an antenna unit. The insulation element is disposed on the metal housing and includes a first heat dissipation hole. The antenna unit is disposed on the insulation element and includes a radiation portion and a feeding portion. The radiation portion is composed of a conductor. The feeding portion is electrically connected to the radiation portion and a grounding plane. In this way, according to the electronic device, space configuration inside the electronic device is saved and a shielding effect of the metal housing is prevented from affecting stability of sending and receiving a signal.

Disclosed is a radio-wave-transmissive cover of a vehicle radar, which exhibits a metallic color and is imparted with improved radio-wave transmission performance. The radio-wave-transmissive cover may include an optical film formed by simultaneously depositing an aluminum (Al) material and a low-melting-point material, such that a radio wave radiated from an antenna of a radar, for example, provided in a vehicle is transmitted. The radio-wave-transmissive cover includes a substrate, and an optical film including aluminum (Al) and a low-melting-point metal having a melting point less than the melting point of aluminum (Al) on the surface of the substrate.