306results about How to "Reduce mutual coupling" patented technology

The invention discloses a broadband wide beam dual-polarization dipole antenna, belonging to a dipole antenna. The broadband wide beam dual-polarization dipole antenna comprises an antenna cover plate, a reflection plate and a first antenna dielectric slab and a second antenna dielectric slab in cross fixing, wherein the first antenna dielectric slab and the second antenna dielectric slab are mounted on the reflection plate; the antenna cover plate is supported by at least three support columns and placed above the reflection plate, the first antenna dielectric slab and the second antenna dielectric slab; and toothed rails are arranged at the outer parts of the first antenna dielectric plate and the second antenna dielectric plate and also mounted on the reflection plate. By adding the toothed rails around the dipole antenna dielectric slabs, the antenna operation is effectively expanded, and the width of the wide beam is increased; the antenna unit covers the frequency range of 1,710-2,690MHz when the standing wave is less than 1.4, and is directly fed through a microstrip feeder and a through hole with a metalized edge in the reflection plate; and moreover, the processing is easy, the integration of an antenna and a feed network after array formation is facilitated, and the application range is broad.

A magnetic receiver with a magnetically permeable core is positioned inside a wellbore casing and operated in a feedback mode to reduce attenuation of a measurable magnetic field. The receiver employs a feedback device to reduce mutual coupling between the core and the casing, which reduces the otherwise normal attenuation of em signals inside the casing. The feedback device may be provided in the form of an extra or feedback winding that effectively cancels the inducing field inside the core and reduces the attenuation otherwise caused by the core-casing interaction. Alternatively, the magnetic receiver may employ, as the feedback device, a current feedback amplifier circuit to cancel the inducing field inside the core. Specifically, the circuit is operated to produce a secondary magnetic field that essentially cancels the inducing field inside the core.

The invention discloses a DOA (direction of arrival) estimation method based on a nested minimum redundant array, and mainly solves the problem of low DOA estimation resolution when the number of targets is greater than the number of array elements in the prior art. An implementation process of the method comprises the following steps: 1, giving a total array element number to built a nested minimum redundant array (NMRA), 2, obtaining received data X(t) of the NMRA according to the NMRA, 3, estimating a covariance matrix R<XX> of the NMRA according to the X(t), vectorizing the R<XX>, removing repeated elements, and then obtaining differential synthesis array received data Z<c>, 4, dividing Z<c> into a plurality of sub array received data, calculating a covariance matrix of each sub array received data, performing forward and backward smooth average, and then obtaining rank recovery data covariance matrix R<SS>, and 5, performing eigenvalue decomposition on the R<SS>, and then obtaining a DOA estimation angle. The method has the advantages of the large aperture, the high degree of freedom and good DOA estimation angle measurement performance in the same condition, and can be applied to radar target signal detection or power estimation.

The invention discloses a compact multi-beam antenna array with high and low frequencies of filtering oscillators in interlacing arrangement. The antenna array comprises first and second subarrays arranged on a substrate, the first and second subarrays work in first and second frequency ranges respectively and are arranged in an interlacing manner, array elements of one subarray are distributed in spaces among array elements of the other subarray dispersely, the first subarray is formed by a first filtering antenna unit of at least one applied-loss-free circuit, and the second subarray is formed by a second filtering antenna unit of at least one applied-loss-free circuit. The whole array is formed by interlacing arrangement of oscillators in two frequency ranges, and compared with a design in which the high-frequency oscillators and low-frequency oscillators are arranged separately, the size can be reduced; and compared with design of interlacing oscillator array without a filtering characteristic, mutual coupling between the oscillators is lower, and a high isolation performance can be maintained.

The invention belongs to the technical field of design and manufacture of millimeter-wave circularly-polarized antennas, aims to solve the problem of difficulty in integration of broadband, high efficiency and arraying of existing millimeter-wave circularly-polarized antennas, and provides a broadband circularly-polarized panel array antenna. The broadband circularly-polarized panel array antenna has the advantages that a novel 90-degree phase delay line is used for feed of a cross recess, four parasitic patches added above the cross recess are used for improving antenna unit gain and 3dB axial ratio bandwidth, and the designed 90-degree phase delay line has three independent branches which are used for phase delay, amplitude compensation and matching adjustment respectively; a group of short-circuit metal holes are designed beside a strip line to effectively inhibit spreading of a TEM (transverse electromagnetic) mode outside a feed network area, unit cross coupling is reduced greatly, and arraying performance is guaranteed; the antenna made of a multilayer PCB (printed circuit board) has the advantage of low cost and is applicable to millimeter-wave large-scale circularly-polarized arraying, and the problem of difficulty in integration of circularly-polarized antenna efficiency and the axial ratio bandwidth on millimeter-wave frequency bands is solved.

The invention discloses an antenna for reducing a radar scattering cross section, aiming to solve the problem of large radar scattering cross section of the traditional microstrip antenna. The antenna comprises a dielectric slab (1), a microstrip radiating unit (2) and an earth plate (3), wherein the microstrip radiating unit is arranged at the upper surface of the dielectric slab, and the earth plate is arranged at the lower surface of the dielectric slab; both sides of the microstrip radiating unit are provided with a high impedance surface array (4) respectively; each high impedance surface array is formed by arranging a plurality of metal chips into a rectangle, a gap is arranged between the adjacent metal chips to form a capacitor C; the center of each metal chip is provided with a metal via hole which penetrates through the dielectric slab; a current path connected by the via holes can form an inductor L, and the capacitor and the inductor form an LC resonant circuit; the frequency of the resonant circuit can be adjusted to be coincident with the working frequency of the antenna, thus realizing scattered field compensation of the high impedance surface array and the antenna. The invention has stable performance of reducing radar scattering cross section within and outside the frequency band of the antenna, and also has no effect on the size, weight and cost of the antenna.

The invention provides a communication terminal, which comprises a substrate and a first antenna system, wherein the substrate comprises opposite first end part and second end part, a first side and a second side; the first side and the second side are connected between the first end part and the second end part; the first antenna system comprises a first radiating body and a second radiating body; the first radiating body is arranged along the first end part; the second radiating body is arranged along the second end part or/and the first side; a working frequency band of the first antenna system comprises a first low frequency band, a first intermediate frequency band and a first high frequency band; one working frequency band in the first low frequency band, the first intermediate frequency band and the first high frequency band is excited by one radiating body of the first antenna system; and the other two working frequency bands are excited by the other radiating body of the first antenna system. The communication terminal has relatively good antenna system radiation performance.

The invention discloses a quasi-surface plasmon-based leaky-wave antenna, and belongs to the technical field of microwaves. The leaky-wave antenna comprises a feed network and a radiating element, wherein the feed network comprises a gradient matching structure; the gradient matching structure is used for achieving conversion of an electromagnetic wave between a TEM mode or a quasi-TEM mode and a quasi-surface plasmon mode; and the radiating element is a quasi-surface plasmon waveguide capable of enabling the phase velocity of the transmitted quasi-surface plasmon to discontinuously change. Compared with the prior art, the radiating element of the leaky-wave antenna is achieved on the basis of the quasi-surface plasmon waveguide for a phase velocity modulation; the quasi-surface plasmon-based leaky-wave antenna is simple in structure, relatively small in interference to an external circuit and relatively easy to process, and does not need metal ground; and omnidirectional radiation and frequency scanning functions are relatively easy to achieve.

An antenna has a plurality of dielectric layers and a plurality of conducting layers. At least one of the dielectric layers comprises one or more regions with differing dielectric properties. A plurality of such antennas may be arranged in an antenna array. The array includes a radiating component etched in the array top first layer, a reflector embedded in a second layer below the top layer, a feeding network located in a third layer below the reflector, and a ground plane bottom layer configured to shield the feeding network in the bottom layer. At least one of the layers of the array is a non-uniform dielectric layer of a material having a substantially different electrical property compared to the array dielectric and conducting layers.

The invention discloses a spiral trumpet shaped microwave energy reclaiming antenna and an array microwave heating apparatus thereof, and relates to microwave heating technology in microwave energy application technology. In the energy reclaiming antenna, a conical trumpet cylinder (15) is eccentrically arranged on a magnetron (12) through a trumpet antenna soleplate (17); and a spiral antenna (14) is arranged on an output antenna head (13) of the magnetron (12). In the microwave heating apparatus of the spiral trumpet shaped microwave energy reclaiming antenna array, the microwave energy reclaiming antenna array is formed by arranging a plurality of spiral trumpet shaped microwave energy reclaiming antennas (1) in delta staggered mode, and radiation ports of all the spiral trumpet shaped microwave energy reclaiming antennas (1) are upward. The spiral trumpet shaped microwave energy reclaiming antenna improves microwave power output efficiency; and the microwave heating apparatus of the spiral trumpet shaped microwave energy reclaiming antenna array has the advantages of higher microwave power output efficiency and coupling efficiency, even heating and smooth moisture discharge, improves working reliability and service life of the magnetron, and saves production and maintenance cost of equipment.

The invention belongs to the field of the antenna technology, and particularly relates to a broadband high-isolation low-cross-polarization dual-polarization microstrip antenna array based on an SIW technology which can be used for various aspects, such as satellite communications, radar orientation, and synthetic aperture radar. The broadband high-isolation low-cross-polarization dual-polarization microstrip antenna array based on the SIW technology comprises 5 layers of printed circuit boards and 54 integrated metal props. In five layers of the printed circuit boards, the medium of the first layer of the printed circuit board and the medium 20 of the second layer of the printed circuit board are Rohacell HF51 foams, the medium of the third layer of the printed circuit board, the medium of the fourth layer of the printed circuit board and the medium of the fifth layer of the printed circuit board are Rogers 5880 medium boards. The antenna is designed on the basis of the microstrip antenna, and the antenna is integrated with the feed and radiation. The structure is simple, and the printed circuit technology is used for producing. The broadband high-isolation low-cross-polarization dual-polarization microstrip antenna array based on the SIW technology has the advantages of low section, light weight, high precision and low cost.

The invention is applicable to the technical field of communication and provides a broadband dual-polarized radiating element. The broadband dual-polarized radiating element is used for being installed on a metal reflective plate to form an antenna. The broadband dual-polarized radiating element is characterized in that the radiating element comprises two pairs of orthogonally polarized dipoles which are used for sending or receiving communication signals, each dipole is correspondingly connected with a pair of Baluns, the bottom of each Balun is connected with an annular base, each dipole comprises a first radiating arm and a second radiating arm which are not symmetrically arranged, and two adjacent radiating arms between the dipoles are arranged at the same plane. The invention further provides the antenna which comprises the broadband dual-polarized radiating element. Therefore, the broadband dual-polarized radiating element and the antenna of the broadband dual-polarized radiating element have the advantages of being capable of reducing cross coupling between a high frequency radiating element of a multifrequency antenna and a low frequency radiating element of the multifrequency antenna, simple in structure, convenient to process, high in reliability and good in electrical performance.

The invention relates to an SIC technology-based four-element dual-polarization microstrip antenna array, which comprises six layers of printed circuit boards and metal supports (6), wherein the lowersurface of a top layer of printed circuit board (17) is printed with rectangular parasitic patches (1); the upper surface of a third layer of printed circuit board (16) is printed with rectangular main patches (2) and a main patch layer reflection plate (11); the upper surface of a fourth layer of printed circuit board (15) is printed with a vertical-polarization feeder line (3) and a ring (8); the upper surface of a fifth layer of printed circuit board (14) is printed with a grounding plate (4); cross gaps (9), circular openings (19) and circular openings (20) are etched on the grounding plate (4); a horizontal-polarization feeder line (5) and a strip line (10) are printed on the lower surface of the fifth layer of printed circuit board (14); and the lower surface of the bottom layer ofprinted circuit board (12) is provided with an antenna bottom reflection plate (13). The SIC technology-based four-element dual-polarization microstrip antenna array has the advantages of wider bandwidth, higher port isolation and lower cross polarization level.

The invention discloses a ridge waveguide planar array antenna employing mechanical center feeding. The ridge waveguide planar array antenna comprises a grid layer, a radiation layer, a coupling layer, a feed network layer and a center feed layer, which are sequentially stacked, wherein the mechanical center of the center feed layer is provided with a feeding opening which is vertical to an antenna array and is used for inputting and outputting a signal; the feed network layer is composed of a single ridge waveguide; and ridges are arranged at the centers of narrow sides of various branches of a ridge waveguide power divider on the feed network layer. Through introducing the grid layer and the center feed layer, adopting the design of a ridge waveguide power dividing network, and successfully combining with other structure layers, the targets of improving the out-of-roundness of an antenna radiation pattern, improving the antenna standing wave bandwidth and realizing mechanical center feeding of the antenna are achieved.

A power combiner includes a planar figure-8 shaped primary winding and a planar figure-8 shaped secondary winding; wherein, the planar figure-8 shaped primary winding is substantially overlaid with the planar figure-8 shaped secondary winding. In addition, there is provided a radio frequency (RF) transmitter having a power combiner, where the power combiner includes a planar figure-8 shaped primary winding and a planar figure-8 shaped secondary winding, wherein the planar figure-8 shaped primary winding is substantially overlaid with the planar figure-8 shaped secondary winding.

The invention provides a three-dimensional metamaterial decoupling structure used for a microstrip array antenna. The structure comprises a public grounding plate, a dielectric substrate on the public grounding plate, two rectangular radiation patches symmetrically arranged on the upper surface of the dielectric substrate, and two coaxial feed ports, wherein five three-dimensional metamaterial decoupling units are embedded in the portion, between the two rectangular radiation patches, in the dielectric substrate in a row. By embedding the five three-dimensional metamaterial decoupling units in a dielectric between microstrip antenna array elements, intercoupling between the microstrip antenna array elements is effectively reduced, and accordingly the isolation of an antenna array is improved.

The invention discloses a three-frequency-range common-caliber active navigation antenna, for solving the problems of not wide enough work frequency band of a conventional navigation antenna, low radiation efficiency and low elevation angle gain of a directional diagram. The three-frequency-range common-caliber active navigation antenna comprises a common-caliber antenna unit (1), a filter (2), a low-noise amplifier (3) and a back cavity (4). The common-caliber antenna unit (1) comprises a high-frequency radiator, an intermediate frequency radiator and a low frequency radiator, the three radiators are successively laminated from top to bottom, and the high frequency radiator and the low frequency radiator employ capacitance coupling feed and introduce parasitic patches; the filter (2) and the low-noise amplifier (3) are disposed below the common-caliber antenna unit (1) and are installed in the cavity of the back cavity (4); and the common-caliber antenna unit (1), the filter (2) and the low-noise amplifier (3) are successively connected. The three-frequency-range common-caliber active navigation antenna can realize multiplexing of antennas of three system frequency ranges and also has the advantages of wide work frequency band and good radiation characteristic, thereby being applied to reception of signals of a satellite navigation system.

The invention discloses a high-isolation MIMO (Multiple Input Multiple Output) antenna, and belongs to the technical field of antennas. The whole antenna is symmetric around a central axis by a left and right mirror manner. The antenna comprises a rectangular dielectric substrate, a first radiator, a second radiator, a first microstrip feeder, a second microstrip feeder, an isolator, and a grounding plate which is equipped with a rectangular gap and arranged on the rear surface of the dielectric substrate, wherein the first radiator, the second radiator, the first microstrip feeder, the second microstrip feeder and the isolator are arranged on the front surface of the dielectric substrate. According to the antenna, the isolation performance of the system can be improved by the isolator; slots are formed in a floor, so that the bandwidth of the antenna can be increased; the problems of poor isolation, narrow frequency band and large size of the traditional MIMO antenna can be effectively reduced.

The invention discloses a coupled-feeding reconfigurable antenna and a manufacturing method. The antenna comprises a feed source, a floor board, a dielectric plate, a low-pass filter, a low-frequency radiation unit, a radio-frequency switch, a first coupling sheet, a first high-frequency radiation unit, a second coupling sheet, and a second high-frequency radiation unit. The first side surface of the dielectric plate is provided with the first coupling sheet, and a feed point is connected with the feed source. The second side surface, opposite to first side surface of the dielectric plate, of the dielectric plate is provided with the second coupling sheet, wherein the second coupling sheet and the first coupling sheet are symmetric, and are equivalent to a coupling feed capacitor. The low-frequency radiation unit is disposed on the dielectric plate or a cellphone housing, and the low-pass filter is connected in series between a second contact of the low-frequency radiation unit and the feed point. The dielectric plate between the low-pass filter and the feed point is provided with a via hole. According to the embodiment of the invention, the antenna improves the radiation efficiency and gain of an antenna system, and finally improves the working performance of the antenna system.

A method and equipment for high-precision laser collimation controlled by fast feedback of optical beam shift integrates optical intensity modulation, optical fibre collimation and fast feedback and control techniques. Said method includes modulating the laser beam to become alternative beam, primary collimation by use of single-mode fibre, decomposing the beam shift into horizontal shift and angle shift, high-precision phase-lock amplifying and detecting, and using the feedback control mechanism to decrease the shifts by alternative regulations.

Abstract Antenna device for hearing instruments The disclosure relates to an antenna device for hearing instruments, especially for hearing instruments to be worn in the auditory canal. A need exists specifying a hearing instrument, especially ITE hearing instrument having a data transmission system improved in respect of transmission bandwidth with no increase or only an insignificant increase in space and energy requirement. Disclosed an antenna device for a hearing instrument with an antenna arrangement (16) having a preferred send and receive spatial direction, and a further electrical hearing instrument component (13) which emits noise radiation predominantly in a noise radiation spatial direction. The antenna arrangement (16) and the further hearing instrument component (13) are disposed so that the send and receive spatial direction and the noise radiation spatial direction are oriented transverse to one another in such a way that a coupling-in of noise radiation into the antenna arrangement is reduced. The reduction of the noise couplings into the antenna arrangement makes possible a higher send and receive bandwidth, with the installation volume and energy requirement remaining the same. The further hearing instrument component can involve a receiver or any other component, especially one emitting inductive or electromagnetic radiation.

A multiple input multiple output (MIMO) antenna is provided. The MIMO antenna may include, but is not limited to, a printed circuit board having a plurality of edges and a ground layer including, but not limited to a plurality of antenna element mounting locations, at least one of the plurality of antenna element mounting locations being arranged on a first side of the printed circuit board and at least one of the plurality of antenna element mounting locations being arranged on a second side of the printed circuit board, a plurality of slots, each of the plurality of slots extending a predetermined distance from an edge of the printed circuit board, and at least one ground stub, the at least one ground stub comprising an extension of the ground layer of a predetermined electrical length at a predetermined angle relative to the edge of the printed circuit board.