105results about How to "Improve front-to-back ratio" patented technology

A dual polarized variable beam tilt antenna (10) having a plurality of offset element trays (12) each supporting pairs of dipole elements (14) to orient the dipole element pattern boresight at a downtilt. The maximum squint level of the antenna is a consistent downtilt off of boresight and which is at the midpoint of the antenna tilt range. The antenna provides a high roll-off radiation pattern through the use of Yagi dipole elements configured in this arrangement, having a beam front-to-side ratio exceeding 20 dB, a horizontal beam front-to-back ratio exceeding 40 dB, and is operable over an expanded frequency range.

The invention provides a dual-polarized vibrator unit, an antenna and a multi-frequency antenna array. The dual-polarized vibrator unit includes a radiator and a balun support portion for feeding of the radiator. The radiator includes a dielectric substrate, two pairs of dipole antenna arms being disposed on an upper surface of the dielectric substrate and in orthogonal arrangement of plus or minus 45 degrees, and at least one coupling metal strap disposed on a lower surface of the dielectric substrate. Current induction is generated between the dipole antenna arms and the coupling metal strap so that a current path is formed on the coupling metal strap. The vibrator unit and the antenna thereof in the invention can achieve the ultra-broadband, high gain, high efficiency, high cross polarization ratio and high front-ratio, high isolation, low profile and low coupling and is simple and beautiful in structure, easy in engineering realization and suitable for mass production, the production cost is reduced, and the electrical performance index meets the base station antenna industry standard.

A dual polarized variable beam tilt antenna (10) having a plurality of offset element trays (12) each supporting pairs of dipole elements (14) to orient the dipole element pattern boresight at a downtilt. The maximum squint level of the antenna is a consistent downtilt off of boresight and which is at the midpoint of the antenna tilt range. The antenna provides a high roll-off radiation pattern through the use of Yagi dipole elements configured in this arrangement, having a beam front-to-side ratio exceeding 20 dB, a horizontal beam front-to-back ratio exceeding 40 dB, and is operable over an expanded frequency range.

The invention discloses a broadband dual polarized antenna unit, which comprises a radiator and a balanced feeding device, wherein the radiator consists of four radiation fins which are symmetric in pairs and are orthogonally distributed; the balanced feeding device consists of an excitation core wire and a balanced balun; the balanced balun is simultaneously formed into a support of each radiation fin; a symmetric radiation array is as long as a half of wavelength and is as wide as a quarter of the wavelength; each radiation fin further comprises a supporting area and a radiation area which are mutually adjacent; the two short sides and long sides of the radiation area and the two waists of the supporting area form a continuous curve; the ratio of the waist length of the supporting area to the length of the short side of the radiation area to the length of the long side of the radiation area is 1:1:2; and the two waists of each of the two adjacent radiation fins are arranged in parallel and are at an interval less than 0.1 wavelengths. The dual polarized antenna unit is a radiation oscillator which is relatively wider than the broadband and has good indexes, such as a standing-wave ratio and the like in a relatively wider bandwidth.

The invention discloses a frequency selection surface structure based on multilayer annular slit pasters. The frequency selection surface structure is composed of N*M resonance units. The resonance units comprise two medium substrates in parallel arrangement, the upper surface and the lower surface of each medium substrate are each provided with an annular slit paster, and the structure of each annular slit paster is specifically formed in such a way that rectangular slits are respectively arranged at the center points of four edges of an inner ring of an FSS annular paster, the rectangular slits being symmetrical about the edge center points of the inner ring. According to the invention, four annular slit pasters are employed, cascading of a multi-stage band-stop filter is realized, the band-stop performance is better, and the bandwidth is wider.

The invention discloses an array antenna of a circularly polarized dielectric resonator, which can be used in the field of communication. The array antenna of the circularly polarized dielectric resonator comprises a feeder unit and four unit antenna arrays, wherein the four unit antenna arrays comprise four linearly polarized dielectric resonator units with single-end feed; the feeder unit comprises a power divider with a phase-shifting function, an impedance converter and a coupler and can assign equal power for each linearly polarized dielectric resonator unit, and the phase difference of adjacent linearly polarized dielectric resonator units is 90 degrees. The array antenna of the circularly polarized dielectric resonator has the advantages of circularly polarized property, high gain and front-back ratio, simple feed network, easy manufacture, and the like.

The invention discloses a filtering antenna used for a wearable device. The antenna comprises a top layer medium substrate, a bottom layer medium substrate, an antenna radiation unit, a top layer metal floor, a bottom layer metal floor and an artificial magnetic conductor structure. The upper surface of the top layer medium substrate is printed with the antenna radiation unit and a lower surface is printed with the top layer metal floor. The upper surface of the bottom layer medium substrate is etched with the artificial magnetic conductor structure and a lower surface is printed with the bottom layer metal floor. The antenna radiation unit is formed by a circular patch and a micro-strip coupling feed branch knot structure. The antenna is miniature, is easy to integrate, has a low profile,a high gain and anti-interference performance, can work in an ISM-5.8GHz frequency range, can be used for the wearable device and possesses filtering performance and other advantages. And the antennais suitable for the human body local area network wireless communication field.

The invention is based on a wideband electromagnetic dipole antenna based on an artificial magnetic conductor. The wideband electromagnetic dipole antenna comprises an electromagnetic dipole antenna and an artificial magnetic conductor (AMC) mounted together. The electric dipole of the electromagnetic dipole antenna is an electric dipole in an open fishtail shape and printed on an electric dipoledielectric plate. Magnetic dipoles are printed on two parallel magnetic dipole dielectric plates and have upper sides perpendicularly connected to the two arms of the electric dipole. A feed balun isprinted on a feed dielectric plate in parallel to the magnetic dipole dielectric plates and placed between the two magnetic dipole dielectric plates. The AMC consists of an AMC dielectric plate, and aperiodic circular metal patch and a grounding metal layer printed thereon, is parallel to the electric dipole, and is placed under the magnetic dipole dielectric plates. The AMC is equivalent to a perfect magnetic conductor (PMC), replaces the PEC reflector of a conventional antenna, and uses coaxial feed. The wideband electromagnetic dipole antenna based on the AMC is increased in the front-to-back ratio, has a stable directional diagram, and has a wide bandwidth, high gain and easy integration.

The invention belongs to the technical field of wireless communication, A decoupling device and a MIMO antenna are disclosed, The decoupling device comprises a first decoupling device, wherein the first decoupling device is positioned above the array of radiating units; the first decoupling device comprises a dielectric substrate, a lead sheet, a decoupling strip, a lead sheet and a decoupling strip are arranged on the dielectric substrate; the lead sheet is positioned directly above the radiating units; and the decoupling strip is positioned between two rows of radiating units; the decouplingdevice comprises a dielectric substrate, a lead sheet, a decoupling strip and a decoupling strip. The MIMO antenna comprises an antenna reflector, a radiation unit and a decoupling device. The invention solves the problems of poor isolation degree and pattern distortion of MIMO antennas (5G large-scale array antennas) in the prior art.

The invention relates to a feedback type radar antenna, which comprises a feed source used for radiating electromagnetic waves, and a metamaterial panel used for converting the electromagnetic waves radiated from the feed source from spherical electromagnetic waves into plane electromagnetic waves. The metamaterial panel comprises a plurality of core layers with the same refractive index distribution, and each core layer comprises a plurality of metamaterial units each having a unit basic material and an artificial microstructure, wherein the refractive index of each core layer of the metamaterial panel is circularly distributed around the center of the core layer, the refractive index gradually reduces as radius increases, and the same radius has the same refractive index. The feedback type radar antenna greatly enhances antenna far-field power by changing the refractive index distribution in the metamaterial panel, so as to further increase an antenna transmission distance, and increases a front-to-rear ratio of the antenna by arranging a wave absorbing material layer in the cavity of the antenna to make the antenna more directional.

The present invention discloses a miniaturized dual-polarized base station antenna, comprising a radiation device and a feeding unit. The feeding unit comprises two coaxial cables and two vertical baluns consisting of two conductors, and the radiation device is supported on a reflecting plate. The radiation device consists of four crossed oscillators and four groups of symmetric striplines, and the four groups of symmetric striplines are in the center of the radiation device and connected to the crossed oscillators and feed the four crossed oscillators in a matched manner. In the center of the radiation device, the adjacent conductors of the four groups of symmetric striplines are connected to each other to form an end-to-end connected closed conductor ring, and a top conductor sheet on the center of the radiation device is a square or circular metal member.

The invention relates to a feed-forward type radar antenna, which comprises a feed source and a metamaterial panel and further comprises a reflection plate tightly adhered to one side of the metamaterial panel. The metamaterial panel comprises a plurality of core layers with the same refractive index distribution. Each core layer comprises a plurality of metamaterial units. Each metamaterial unitcomprises a unit substrate and an artificial micro-structure. The refractive index of each core layer of the metamaterial panel is circularly distributed based on the centre as the circle centre. Therefractive index is gradually reduced as the radius increases. The refractive indexes at the parts with the same radius are the same. According to the feed-forward type radar antenna disclosed by theinvention, the refractive index distribution rule of the metamaterial panel is changed by designing the shape and arrangement of a metal micro-structure in the metamaterial panel; the panel metamaterial is adopted, so the space of the antenna is saved, the deflection problem resulted from large-angle incidence of electromagnetic wave is improved, and the energy radiation efficiency is increased; simultaneously, the front-to-back ratio of the antenna is increased, thus, the antenna has better directivity.

A subreflector of a dual-reflector antenna comprises a first extremity comprising a convex inner surface, a second extremity adapted for coupling to the extremity of a waveguide, and a body extending between the first extremity and the second extremity. The body comprises a first dielectric part having a portion penetrating into the waveguide and a portion outside the waveguide, and a second metallic part comprising a first cylindrical portion, contiguous with the first extremity of the subreflector, whose diameter is greater than the portion outside the waveguide of the first dielectric part, and a second cylindrical portion, adjacent to the first cylindrical portion, extended by a conical portion that penetrates into the first dielectric part. The first cylindrical portion features a flat ring-shaped surface that forms an angle less than 90° with the axis of the subreflector so as to face the primary reflector.

The invention discloses a dual-polarization vibrator which comprises vibrator radiating surfaces, a first printed circuit board and a metal supporting piece. The vibrator radiating surfaces are fixed to one end of the metal supporting piece. A gap is formed between every two adjacent vibrator radiating surfaces for feed to form a dipole. The first printed circuit board is fixed to the vibrator radiating surfaces. A feed network is formed on the first printed circuit board and comprises a first feed circuit and a second feed circuit, wherein a feed bridge skips the first feed circuit and the second feed circuit in a crossed mode. The feed network feeds electricity to the feed gaps through the first feed circuit and the second feed circuit. The first feed circuit and the second feed circuit are respectively provided with a feeder line connecting point connected to a feeder line. According to the dual-polarization vibrator, the gap feed mode is adopted, the size of an antenna at a lower-frequency stage is smaller, the height of the antenna at the lower-frequency stage is smaller, the frequency bandwidth of the antenna is greatly expanded, and key performance indexes such as the standing-wave ratio, isolation, the front-to-rear ratio and cross polarization of the antenna are improved.

Disclosed is a two-dimensional trench-oriented micro-strip patch antenna, which is characterized in that: firstly, the operating frequency f of the patch antenna is established; secondly, the metal plate material is selected and the thickness of the metal plate is h; thirdly, a micro-strip patch antenna is arranged in the central region of the metal plate and is fed with electricity by making use of the coaxial line; fourthly, N1 ring-shaped trenches are cyclically arrayed and distributed on the exit surface of the metal plate with a cycle of P1, a depth of d1 and a width of w1; finally, N2 traditional ring-shaped trenches are cyclically arrayed and distributed outside the trenches with a cycle of P2, a depth of d2 and a width of w2, and the manufacturing is finished; and the invention adopts a theory that the trench structure modulates the surface wave in order to improve the antenna radiation performance and a theory that the traditional trench structure inhibits the metal plate edge surface wave in order to reduce backward radiation, both of which are integrated and used in the micro-strip patch antenna, so as to improve the front to back ratio of antenna radiation energy and obtain significantly enhanced radiation gains, and meanwhile the antenna beam width can be substantially compressed.

The invention discloses an RFID (Radio Frequency Identification) high-gain circularly polarized microstrip antenna array. The RFID high-gain circularly polarized microstrip antenna array comprises a radiation plate and a reflection plate, wherein the radiation plate comprises a radiation plate dielectric substrate and four radiation units on the surface of the radiation plate dielectric substrate, a radiation unit feed point is arranged on each radiation unit, the reflection plate comprises a reflection plate medium substrate and a feed network on the surface of the reflection plate medium substrate, and the radiation unit feed points are connected with the feed network through support columns and signal wires on the support columns; supplementary angles are formed on two opposite angles of each radiation unit, the positions of the supplementary angles on the four radiation units are consistent, and circularly polarized radiation of antennas is realized by combining a one-point central feed way with the supplementary angles. In order to reduce a standing wave ratio and improve radiation efficiency, the RFID high-gain circularly polarized microstrip antenna array further comprises four tuning aluminum columns which are fixed on the radiation plate. The RFID high-gain circularly polarized microstrip antenna array disclosed by the invention has the advantages of high gain, low axial ratio, half-power wave bandwidth, wide radiation frequency and the like.

The invention relates to a feedforward radar antenna. The antenna comprises a feed source and a metamaterial panel. The antenna also comprises a reflecting plate clinging to one side of the metamaterial panel, wherein the metamaterial panel comprises a plurality of core layers with the same refractive index distribution; each core layer comprises a plurality of metamaterial units; each metamaterial unit comprises a unit substrate with one or more holes; the refractive indexes of the core layers of the metamaterial panel are circularly distributed, with own centers as the centers of circles; the refractive index gradually decreases with increase of the radius; and the refractive indexes in positions with the same radius are the same. The feedforward radar antenna has the following beneficial effects: by designing the distribution law of the refractive indexes inside the metamaterial panel, the deflection of large-angle incidence of electromagnetic waves is improved, and the energy radiation efficiency is improved; meanwhile, the front-to-back ratio of the antenna is increased, and the directivity of the antenna becomes better; and as the antenna adopts the flat metamaterial, the space of the antenna is saved.

The invention relates to a metamaterial antenna which comprises a vibrator, a metamaterial film layer and a reflector, wherein the vibrator is used for generating electromagnetic waves; the metamaterial film layer is used for converging the electromagnetic waves generated by the vibrator and outwards radiating the electromagnetic waves and is also used for converting spherical electromagnetic waves generated by the vibrator into planar electromagnetic waves, and comprises a plurality of metamaterial sheet layers; and the reflector is used for reflecting partial electromagnetic waves generatedby the vibrator to the metamaterial film layer, is a cover-free cavity and forms a closed cavity together with the metamaterial film layer, and the vibrator is arranged in the reflector. Through changing the refractive index distribution condition inside the metamaterial film layer, the invention ensures that a half-power bandwidth of an antenna far field is reduced, further propagating distance of the antenna is increased, and front-to-back ratio of the antenna is increased.

The invention discloses a low-multipath measuring type antenna comprising a PCB plate and two pasters arranged on the PCB plate; the two pasters comprise an upper radiation paster and a lower paster, wherein the upper radiation paster is connected with the lower paster through a medium layer; an edge of the PCB plate is bonded with an absorbing material; a shield is also connected below the PCB plate; the antenna also comprises a plurality of feed probes and fixed probes penetrating the medium layer; the fixed probes are arranged in the center of the feed probes. The edge of the PCB plate is bonded with the high impedance absorbing material, so most surface waves are absorbed by the absorbing material and gradually converted into heat energy, thus reducing back lobe of the antenna, improving back and forth ratio, effectively reducing antenna multipath effect, and the antenna is small in size, light in weight, and excellent in communication performance.

An antenna employed in a base station is provided. The antenna comprises a feed antenna configured to feed power, and a superstrate configured to be located on an upper portion of the feed antenna and have a conductive pattern for increasing a gain and beam width control on a surface of a dielectric substrate. Accordingly, gain increase and beam width control of the antenna can be simultaneously realized.

The invention relates to an antenna. By the antenna, the front-to-back ratio and the cross polarization isolation can be improved on the condition of no change on a structure of a reflection plate. The antenna comprises an antenna oscillator and the reflection plate, wherein the antenna oscillator is arranged on the reflection plate, the antenna also comprises a wave absorption material layer, and the wave absorption material layer is arranged on one side of the outer surface, departing from the antenna oscillator, of the reflection plate.

The invention provides an antenna array, which comprises at least one first radiating element and at least one second radiating element, wherein each second radiating element is vertical to the axis of an array in which the first radiating element is located; each first radiating element comprises two pairs of orthogonally polarized dipoles; each second radiating element comprises at least one pair of orthogonally polarized dipoles; and at least one dipole of each first radiating element is connected with one same polarized dipole in each second radiating element through a feeder for shunt feeding through a feed network. A horizontal beam of an antenna can be narrowed to a certain extent by increasing the space between two same polarized dipoles for shunt feeding, so that the problem that the horizontal beam is widened when the antenna size is reduced is solved; the gain and the front-to-rear ratio of the antenna are improved; and miniaturization of the antenna is facilitated. In addition, the invention further relates to the antenna of using the antenna array. The antenna has relatively high gain and front-to-rear ratio and miniaturization is achieved.

The invention relates to a fallback type radar antenna which comprises a feed source and a metamaterial panel. The metamaterial panel comprises a plurality of core layers with same refractive index distribution, each core layer of the metamaterial panel is composed of a plurality of metamaterial units, and each metamaterial unit comprises a unit substrate with one or a plurality of holes. The fallback type radar antenna greatly strengthens far-field power of the antenna and promotes a propagating distance of the antenna by changing a distribution condition of refractive indexes inside the metamaterial panel, and simultaneously an absorbing material layer is arranged inside a cavity of the antenna to increase a front-to-rear ratio of the antenna and enable the antenna to have directivity.

The invention discloses an antenna array and a multi-port antenna, which are used for simplifying the radiation element array of a multi-port antenna, and improving the radiation performance of the multi-port antenna. The antenna array comprises at least (N+1) radiation unit arrays, and each radiation unit array comprises at least M radiation units, wherein M and N are positive integers which aregreater than or equal to one. Each radiation unit array distributed along an axis and at least one dipole nested in the adjacent radiation unit array form a radiation unit array combination. Each radiation unit array distributed along an axis and the dipole nested in the adjacent radiation unit array are connected in parallel through a feed network for feed. According to the invention, the antennaarray achieves the miniaturization and light weight of the multi-port antenna, guarantees the performance indexes and enables an antenna to have higher engineering applicability and better engineering operability.

The invention provides a base station antenna, which comprises at least one radiating element (120), a reflecting plate (110) and a function board, wherein the reflecting plate (110) is arranged on one side of the at least one radiating element (120) and is used for reflecting electromagnetic wave; the function board and the reflecting plate (110) are respectively arranged on two sides of the at least one radiating element (120); the function board comprises multiple micro-structure units (220). According to the base station antenna provided by the invention, the function board with a conductive geometric structure is arranged, so that the antenna gain can be increased.

The invention discloses a antenna device, including a radiator having feeder wire, a flat reflector dividing along incident direction of radio wave and radiator, the reflector has at least one silt limited on its lateral border.

The invention relates to a microwave antenna made of metamaterials. The microwave antenna comprises a feed source, a metamaterial unit and a wave absorbing unit, wherein the metamaterial unit is used for refracting and gathering partial electromagnetic waves generated by the feed source, and the wave absorbing unit is used for absorbing the rest partial electromagnetic waves generated by the feed source. Therefore, the backwards radiated electromagnetic waves of the feed source are reduced, the front-to-rear ratio of the microwave antenna is obviously improved, and high efficiency of the microwave antenna is ensured.

The invention discloses an end-fire planar circularly polarized antenna. The polarized antenna comprises a dielectric layer; a metal layer composed of an upper surface metal layer and a lower surface metal layer, wherein the upper surface metal layer and the lower surface metal layer are distributed on the upper and lower surfaces of the dielectric layer, and respectively configured with a gap on one side along an antenna radiation direction; through holes, which are arranged on both sides of the dielectric layer and the metal layer parallel to the antenna radiation direction, an keep the electrical connection between the upper surface metal layer and the lower surface metal layer; and a protruding part, which is formed after a part on the dielectric layer close to the gap protrudes a first distance length along the antenna radiation direction, wherein the protruding part is of a first geometric structure.