8 results about "Free space wavelength" patented technology

The application provides a circularly polarized conformal antenna for a curved carrier. 11 The antenna comprises a full-metal floor, a ring-shaped patch, a feed patch and four parasitic patches. The ring-shaped patch resonates in a TM The sequential 90° phase difference provided by the arc-shaped strips can realize circularly polarized radiation. Four parasitic patches surrounding the ring-shaped patch are introduced to excite another circularly polarized resonant mode, thereby widening the bandwidth and improving the gain. In order to verify the conformal performance of the antenna, the performances under different bending radii are compared and discussed. Finally, the final profile of the antenna of the application is 0.054λ0, λ0 is the free space wavelength of the antenna at the center frequency, and the antenna has the characteristics of low profile, wide bandwidth and high gain.

The invention relates to a device (100) for the reflection and / or transmission of electromagnetic radiation, comprising a plurality of phase-shift structures (110) arranged on a surface (120); wherein the distance between any two adjacent phase-shift structures (110) is less than twice the free-space wavelength corresponding to a predetermined lower cutoff frequency; wherein each phase-shift structure (100) comprises at least one phase-shift element (111) configured as a passive dielectric component and configured to cause a phase shift of an electromagnetic wave propagated through the phase-shift element (111);wherein at least one property of the respective phase shift element (111) related to a respective phase shift by a respective phase shift element (111) depends on a position of the respective phase shift element (111) with respect to the surface (120), such that a respective phase shift of a respective part of the reflected and / or transmitted electromagnetic radiation caused by the device (100) depends on a respective location with respect to the surface (120) at which the respective part of the reflected and / or transmitted electromagnetic radiation hits the device (100).

The invention discloses a slot waveguide antenna, a radar with the same and an automobile, and relates to the technical field of waveguide antennas. Comprising a top plate and a bottom plate, the cross sections of the top plate and the bottom plate are rectangular, the bottom plate is parallel to the top plate and located below the top plate, the lower surface of the top plate is fixedly connected with a plurality of cuboid metal columns, the metal columns are enclosed on the lower surface of the top plate in a rectangular shape, and each side edge of the rectangular shape is composed of a plurality of metal columns distributed at intervals. At least two rows of metal columns are arranged corresponding to each side edge, the center distance between every two adjacent metal columns is smaller than 1 / 2 of the free space wavelength, and the air distance is smaller than 1 / 4 of the free space wavelength. The top of the metal column is fixedly connected to the lower surface of the top plate, and a gap smaller than 1 / 4 of free space wavelength is formed between the bottom of the metal column and the upper surface of the bottom plate; the top plate is provided with a plurality of waveguide slots, and the middle part of the bottom plate is provided with a waveguide port. The device has the beneficial effect that the phenomenon of energy leakage caused by the fact that the cavity is not closed can be avoided.

An electromagnetic, EM, device (1000) is disclosed, configured to operate at a defined center frequency f with a free-space wavelength X. The EM device (1000) comprises a plurality of dielectric resonator antennas, DRAs (3100), which can resonate at the same frequency f, forming a unit cell (3200) observed in a plan view of the EM device (1000) having a total footprint equal to or less than X / 2 in both x and y directions of an orthogonal x-y-z coordinate system, wherein the z direction is a vertical extension direction of each DRA (3100') of the plurality of DRAs (3100), the unit cell (3200) defining a DRA subarray (3000).

Antenna arrays for use in MIMO devices are disclosed. Such antenna arrays can include a plurality of array elements, where every two elements in a first direction are digitally predistortionless linear elements, and every two elements in the first direction are nonlinear elements. In the antenna array, the spacing between adjacent elements in the first direction is less than one half of a free space wavelength. Nonlinear precoding is applied to transmissions from the antenna array, the nonlinear precoding converting out-of-band emissions of the transmissions to reactive power in the near field around the antenna array while ensuring that in-band signals generated by the elements are not affected.

The application provides a millimeter wave radar antenna array and a radar device, comprising: a plurality of transmitting antennas, wherein the intervals of four transmitting antennas in a first direction are 7d, 11d and 3d in turn, and the intervals of six transmitting antennas in a second direction are 3d, 8d, 12d, 3d and 6d in turn; a plurality of receiving antennas, wherein the intervals of four receiving antennas in the first direction are 9d, 7d and 4d in turn, and the intervals of six receiving antennas in the second direction are 4d, 6d, 7d, 7d and 4d in turn; wherein d is half of the free space wavelength, the first direction and the second direction are perpendicular, the plurality of transmitting antennas and the plurality of receiving antennas are arranged in an L shape, and the plurality of transmitting antennas and the plurality of receiving antennas are arranged in a mouth shape. In this way, the angle resolution and the anti-interference performance are high.

The present invention provides an antenna unit that can suitably widen the beam width by 3 dB. [Solution] The antenna unit comprises a single feeding antenna provided in a dielectric and a pair of parasitic antennas provided in the dielectric on one side and the other side with respect to the single feeding antenna. The feeding antenna has a feeding body that includes a feeding line and a radiating element fed from the feeding line. The pair of parasitic antennas consist of a first parasitic antenna provided on one side and a second parasitic antenna provided on the other side with respect to the single feeding antenna, and each parasitic antenna includes a parasitic body that is substantially the same shape as the feeding body and a phase adjustment line extending from its end. The single feeding antenna is a horizontally polarized antenna, with a free-space wavelength λ, a dielectric wavelength λg, and the sum of the two λe, and the sum of the first pitch and first length, and the sum of the second pitch and second length are between 0.75λe+[(λ / 2)×n] and 1.05λe+[(λ / 2)×n] (where n is an integer of 0 or more).

The invention relates to a device (100) for reflecting and / or transmitting electromagnetic radiation, comprising a plurality of phase-shifting structures (110) which are provided on a surface (120); a respective distance between each pair of adjacent phase-shifting structures of the plurality of phase-shifting structures (110) being less than double a free-space wavelength corresponding to a specified lower limit frequency; each of the plurality of phase-shifting structures (100) comprising at least one phase-shifting element (111) which is designed as a passive dielectric component and which is designed to bring about a phase shift of an electromagnetic wave propagating through the phase-shifting element (111); at least one property of a respective phase-shifting element (111) related to a respective phase shift carried out by the respective phase-shifting element (111) being based on the position of the respective phase-shifting element (111) with respect to the surface (120) such that a respective phase shift of a respective part of the reflected and / or transmitted electromagnetic radiation, said phase shift being caused by the device (100), is based on the respective location on the surface (120) at which the respective part of the reflected and / or transmitted electromagnetic radiation is incident on the device (100).