20 results about "Free space wavelength" patented technology

Provided is a power distributor / combiner 1 that outputs an input microwave power after distributed or combined; the power distributor / combiner 1 including: a main body 10 that defines a radial waveguide 101 as a substantially cylindrical cavity; a center terminal 11 as an electromagnetic field coupling terminal, arranged in the radial waveguide 101 of the main body 10 while aligned with the center axis C of the radial waveguide 101; and a plurality of peripheral terminals 12 as electromagnetic field coupling terminals, arranged in the radial waveguide 101 radially away from the center terminal 11, and the radial waveguide 101 having a radius R smaller than a quotient of a free-space wavelength at a frequency of the microwave power, divided by 2.619.

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.

A silicon-photonic optical modulator includes at least one optical input and at least one optical waveguide that is connected to the at least one optical input. The at least one optical waveguide is configured to propagate quasi-transverse-magnetic (quasi-TM) polarized light, where each of the at least one optical waveguide is configured as a rib waveguide that includes a rib arranged on a slab. The silicon-photonic optical modulator also includes at least one electrode configured to apply at least one electric field to the quasi-TM polarized light in the at least one optical waveguide. In some implementations, a height of the rib waveguide is greater than 0.85 λ / n, where λ is a free-space wavelength of light and n is a refractive index of silicon in the silicon-photonic optical modulator, and a width of the rib waveguide is greater than a thickness of the slab.

The invention discloses an annular dielectric loaded terahertz high-gain luneberg lens antenna unit and array, the appearance of an upper layer metal structure (A) and a lower layer metal structure (B) of the antenna unit is a semi-circular ring located on one side of a rectangle, the upper layer metal structure (A) covers the lower layer metal structure (B), and the lower layer metal structure (B) covers the upper layer metal structure (A). The stepped disc dielectric lens (C) is located between the upper-layer metal structure (A) and the lower-layer metal structure (B), the annular dielectric lens (D) is located on the outer side of a semicircular ring of the upper-layer metal structure (A) and the outer side of a semicircular ring of the lower-layer metal structure (B), and the two ends of the annular dielectric lens (D) are fixed to the two sides of the lower-layer metal structure (B) through screw hole sites (D3). The stacking spacing of the array is far more than one half of the free space wavelength, so that the processing difficulty can be reduced, and the high-gain radiation characteristic can be effectively realized; the annular dielectric lens is loaded at the tail end of the luneberg lens antenna, so that the grating lobe effect of a large-spacing array can be eliminated, and the original beam scanning capability is reserved.

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.

The application discloses a kind of HfAlO x / graphene / HfAlO x Heterojunction phase modulator, preparation method and phase modulation method, the HfAlO x / graphene / HfAlO x Heterojunction, using HfAlO x As dielectric material, form good heterojunction structure with graphene.HfAlO x With high dielectric constant and good stability, can effectively regulate the electrical properties of graphene, while avoiding the Fermi level pinning effect when graphene is in direct contact with metal, improve the efficiency and flexibility of phase modulation.The whole structure length is only 800nm, much smaller than the free space wavelength of mid-infrared waveband, subwavelength operation is realized.This small size structure is conducive to the high integration and miniaturization of device, can be applied to high-density optical integrated chip, micro optical sensor and other fields, help to improve the integration and portability of system.

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 discloses a low-profile base station antenna and a dual-polarized antenna array, and the low-profile base station antenna comprises a first radiator, a second radiator, an upper dielectric plate, a lower dielectric plate, a metal ground and a support column, the first radiator is arranged on the top surface of the upper dielectric plate, the second radiator is arranged on the bottom surface of the upper dielectric plate, and the top points of the first radiator and the second radiator are arranged in alignment with each other; the upper dielectric plate is arranged on the top side of the lower dielectric plate and is connected through the support column; and the metal ground is arranged on the bottom surface of the lower dielectric plate. Through the structural design of the low-profile base station antenna, the multi-radiation arm technology or the artificial magnetic conductor technology mentioned in the background art is not needed, and only the input impedance of the antenna is adjusted to match by changing the structure and working mode of the antenna itself, so that the antenna profile is reduced to 0.094 lambda c (lambda c is the free space wavelength corresponding to 2350 MHz), and the wide frequency communication frequency band of 2010-2690 MHz can be covered.

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 present invention relates to a proton CT energizer based on a linear acceleration section, comprising a pre-bunching structure, a vacuum drift section, a linear acceleration section, and a bending magnet with a beam scraper, all connected in sequence. The linear acceleration section is composed of several subunits, each of which includes a quadrupole magnet and at least one proton linear acceleration tube. Each proton linear acceleration tube is connected to a power source via a waveguide system, and the power source is connected to a low-level control system. The proton linear acceleration tubes in two adjacent subunits have different β values, forming a segmented multi-β value distribution in the linear acceleration section, wherein the β value is equal to the ratio of twice the single cavity length of the proton linear acceleration tube to the free space wavelength at the operating frequency of the proton linear acceleration tube. The present invention can increase proton energy to 330 MeV or above, while reducing beam loss in the linear acceleration section of the proton beam extracted from a cyclotron or synchrotron.

The present invention discloses a terahertz high-gain Luneburg lens antenna unit and array loaded with an annular dielectric. The antenna unit comprises an upper metal structure (A) and a lower metal structure (B) each shaped like a semicircular ring located on one side of a rectangle. The upper metal structure (A) overlies the lower metal structure (B). A stepped disk dielectric lens (C) is located between the upper and lower metal structures (A and B). An annular dielectric lens (D) is located outside the semicircular rings between the upper and lower metal structures (A and B). The ends of the annular dielectric lens (D) are fixed to the lower metal structure (B) via screw holes (D3). The stacking spacing of the array of the present invention far exceeds half the free-space wavelength, reducing processing difficulty and effectively achieving high-gain radiation characteristics. Loading the annular dielectric lens at the end of the Luneburg lens antenna eliminates the grating lobe effect of a large-pitch array, retaining the original beam scanning capability.

Provided is a radio wave radiator comprising: a waveguide; a radiation structure that radiates radio waves; and a modulation part that modulates the radiated radio waves. A plurality of the radiation structures are arranged at intervals of 1 / 2 or less of a free space wavelength corresponding to an operation frequency. The modulation part includes a material having a sheet resistance that changes depending on the voltage. A radiation pattern changes according to the change in the sheet resistance by an applied voltage. The material having a sheet resistance that changes depending on the voltage has a sheet resistance minimum value RsL of 10,000 Ω / Sq or less at 25℃ at an applied voltage of -40 V to 40 V.

A lens is provided for shaping electromagnetic radiation energy originating from a signal feed when energized. The lens operates at a defined center frequency having a free space wavelength. The lens includes dielectric materials stacked side by side. An adjacent dielectric material has a dielectric constant value that is different from a dielectric constant value of another adjacent dielectric material. The dielectric materials have an overall footprint in an x-y plane and an overall thickness in a z-direction. Each cross-section of the dielectric materials in the x-y plane includes each one of the of dielectric materials. Each cross-section of the dielectric materials in one of the x-z plane and the y-z plane includes each one of the dielectric materials. At least one cross-section of the dielectric materials in the other one of the x-z plane and the y-z plane includes only one of the plurality of dielectric materials.

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).

A silicon-photonic optical modulator includes at least one optical input and at least one optical waveguide that is connected to the at least one optical input. The at least one optical waveguide is configured to propagate quasi-transverse-magnetic (quasi-TM) polarized light, where each of the at least one optical waveguide is configured as a rib waveguide that includes a rib arranged on a slab. The silicon-photonic optical modulator also includes at least one electrode configured to apply at least one electric field to the quasi-TM polarized light in the at least one optical waveguide. In some implementations, a height of the rib waveguide is greater than 0.85 λ / n, where λ is a free-space wavelength of light and n is a refractive index of silicon in the silicon-photonic optical modulator, and a width of the rib waveguide is greater than a thickness of the slab.

A low-loss bidirectional HE11 coupler is disclosed with substantially higher directivity than prior HE11 THz couplers for overmoded waveguides operating in a frequency band centered about ∫0, where ∫0 is between 0.03 to 1.5 THz, with mid-band free-space wavelength λ0, wherein the coupler comprises a dielectric mirror of substantially elliptical shape located such that its center approximately coincides with said intersection point.

An embodiment includes a lens 1000 for use with a signal feed 2000 for shaping electromagnetic, EM, radiation energy originating from the signal feed 2000 when energized, the lens 1000 configured to operate at a defined center frequency fc having a free space wavelength λc, the lens 1000 comprising: a plurality of dielectric materials 1100 stacked side by side, wherein an adjacent one 1100.1 of the plurality of dielectric materials has a dielectric constant, Dk, value that is different from a Dk value of another adjacent one 1100.2, 1100.3 of the plurality of dielectric materials 1100, the plurality of dielectric materials 1100 having an overall footprint a x b in an x-y plane and an overall thickness t in a z-direction, of an orthogonal x-y-z coordinate system; wherein each cross-section of the plurality of dielectric materials 1100 in the x-y plane comprises each one of the plurality of dielectric materials 1100; wherein each cross-section of the plurality of dielectric materials in one of; the x-z plane, and the y-z plane, comprises each one of the plurality of dielectric materials 1100; wherein at least one cross-section of the plurality of dielectric materials in the other one of; the x-z plane, and the y-z plane, comprises only one of the plurality of dielectric materials 1100.