49results about How to "Reduce back radiation" patented technology

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 relates to a high-gain G-shaped dual-frequency monopole antenna with a loaded dual-frequency AMC reflection plate, and belongs to the technical field of electromagnetism propagation and receiving. According to the micro-strip-line-feed G-shaped dual-frequency monopole antenna with the loaded dual-frequency AMC reflection plate, the dual-frequency AMC reflection plate is loaded under the G-shaped dual-frequency antenna. The antenna is characterized in that under the condition that the section of the antenna is kept low, the maximum gain of a 2.4-GHz frequency band and a 5.2-GHz frequency band in a WLAN system reaches 7.2dBi, and backward radiation of the 2.4-GHz frequency band and the 5.2-GHz frequency band in the WLAN system reduces by 14.1dB and 13.7dB respectively. The designed high-gain dual-frequency antenna with the loaded AMC reflection plate can be used for a 2.4-GHz system (2.4GHz-2.48GHz) and a 5.2-GHz system (5.15 GHz-5.35GHz) in the WLAN system, and provides guidance for a high-gain antenna working in a dual-frequency WLAN system.

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 present invention relates to a RFID reader with an antenna system for emitting and receiving RFID signals. The antenna system includes at least a first inverted F antenna and a second inverted F antenna each having a feed element, a radiating element with a first end coupled to the feed element and a second end free, and a tuning element having a first end coupled to the ground plane and a second end coupled to the first end of the radiating element. The radiating elements of the two inverted F antenna extend in a first direction and a second direction respectively, said first and second directions being offset by a non-zero sequential rotation. In addition, the two inverted F antennas are isolated from each other by a quarter wavelength slot etched in the ground plane between the two antennas.

This invention discloses one chip integration waveguide double frequency wide band gap array antenna unit used in communication system, which comprises medium chip with both sides coated with metal paster, wherein, the chip is located with chip integration waveguide with one end shortcut and the both sides of the center line are separately located with groove and tuning metal hole and the waveguide is composed of two rows of meal hole with another end shortcut sealed by metal hole.

The invention provides a broadband metasurface antenna based on differential dielectric resonator feeding. The broadband metasurface antenna comprises a first rectangular dielectric plate, a second rectangular dielectric plate and a rectangular dielectric resonator, wherein the first rectangular dielectric plate and the second rectangular dielectric plate are stacked up and down. 4 * 3 periodically arranged rectangular metal patches are printed on the upper surface of the first dielectric plate, and the two rectangular metal patches in the center are removed to form a metasurface radiator; linear gaps are etched in the rectangular metal patches at the four corners of the metasurface radiator, and open gaps are etched in the rectangular metal patches on the side wings of the long sides of arectangular through hole. A metal floor is printed on the upper surface of the second rectangular dielectric plate; a metal strip is printed on the side face of the rectangular dielectric resonator,and a feed probe is arranged nearby the rectangular dielectric resonator. The feed probe is connected with the rectangular dielectric resonator through the metal strip and carries out differential feeding. According to the invention, on the basis of ensuring that the metasurface antenna has small backward radiation, the bandwidth of the antenna is expanded.

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.

A small broadband monopole antenna having a perpendicular ground plane with an electromagnetically coupled feed is provided. The small broadband monopole antenna may be realized as a small antenna having a size of 0.085λ₀×0.085λ₀×0.085λ₀ by positioning a folded strip line under a shorted square disc. A resonance of the shorted square disc may be coupled to a resonance of the square folded strip line so as to form a wide bandwidth of about 36.6% of a central frequency of 2.313 GHz based on a VSWR≦2. Also, rectangular slits may be inserted into the perpendicular ground plane to improve a distortion of a radiation pattern that forms on the perpendicular ground plane so as to reduce a backward radiation by 3 dBi or more. The small broadband monopole antenna exhibits a forward radiation pattern similar to that of a general monopole antenna and has a gain of about 2.6 dBi within a bandwidth.

The invention discloses a 2T2R symmetric antenna system and a multiple-input-multiple-output power equalization method. The system comprises a symmetrical two-path transmission and power equalizationmodule and a symmetrical two-path broadband antenna module. The symmetrical two-path broadband antenna module comprises a first-path radiation antenna and a second-path radiation antenna, which are same in size and parallel to each other in position and are connected with the symmetrical two-path transmission and power equalization module; the symmetrical two-path transmission and power equalization module is used for generating a first radio frequency signal and a second radio frequency signal which are equal in amplitude, equal in frequency and same in phase and sending the signals to the symmetrical two-path broadband antenna module; and the first-path radiation antenna and the second-path radiation antenna are used for receiving the first radio frequency signal and the second radio frequency signal and sending the first radiation signal and the second radiation signal respectively. The 2T2R symmetric antenna system and the MIMO power equalization method provided by the invention realize consistency of gain ranges of two paths of radiation signals of a 2T2R small base station in an indoor space and realize a good indoor coverage effect.

The invention discloses a low-profile miniaturized decoupling structure based on a patch MIMO antenna, and the decoupling structure comprises a metal grounding plate and a rectangular dielectric substrate which are sequentially arranged from bottom to top, and the upper surface of the rectangular dielectric substrate is provided with a first patch antenna, a second patch antenna and a microstrip resonator. The distances from the coupling edges of the antennas and the microstrip resonator to the microstrip resonator are equal, and the coupling strengths are equal; the first patch antenna and the second patch antenna are respectively provided with a first input port and a second input port, one side of the central position of the microstrip resonator is provided with a square branch knot, and the center of the square branch knot is provided with a metalized via hole; and the coupling from the first patch antenna to the second patch antenna and the coupling from the first patch antenna to the second patch antenna after passing through the microstrip resonator are in equal amplitude and opposite directions. The structure has the advantages of being compact in structure, low in profile, high in performance and the like, and is suitable for an MIMO communication system.

The invention provides a novel handset antenna which comprises a radiation plate. A reflecting plate is placed below the radiation plate. Supporting foam is arranged between the reflecting plate and the reflecting plate. The reflecting plate is of a multilayer resonance structure. The radiation plate comprises a dielectric plate. Two metal rings are arranged on the upper surface of the dielectric plate, and coupling capacitance effect can be formed between the two metal rings. A matching zone is arranged on the dielectric plate below the metal rings. Parallel two-line feed and symmetrical matching resistance capacitance modes are used in the zone. Two copper paving pasting pieces are arranged at the portions, close to the bottom side, of the upper surface and the lower side of the dielectric plate. The two opposite copper paving pasting pieces are connected through a metallization via hole. The upper surfaces of parallel two lines are communicated with the two copper paving pasting pieces respectively. The two copper paving pasting pieces are connected with feeder lines in a welding mode. The novel handset antenna is small in size, the front-back ratio is good, the antenna is of the resonance structure which can restrain electromagnetism energy, antenna backward radiation is effectively lowered, the impedance bandwidth ratio is good, the antenna is made of FR4 materials, batch machining is easy, cost is low, and mounting is convenient.

The invention discloses an exhaust pipe type embellished antenna. The exhaust pipe type embellished antenna comprises an antenna housing, an antenna body and a first baffle board, wherein the antenna body and the first baffle board are arranged in the antenna housing; the antenna body comprises a second baffle board and radiating units on one face of the second baffle board; the first baffle board and the second baffle board are both elongated longitudinally, and the longitudinal elongation directions of the two baffle boards are identical to the axial direction of the antenna housing; the first baffle board is arranged between the radiating units and the antenna housing. By adoption of the structure, antenna radiation indexes can be less influenced by the antenna housing, deformity of directional diagrams can be reduced, and difficulty in design of the embellished antenna is greatly lowered; the radiating units on the second baffle are arrayed in a multi-level bending structure, and the multi-band antenna with small size can be realized.

The invention discloses a bent T-shaped rotating structure based directional circularly polarized antenna, and belongs to the technical field of mechanical structure design. The directional circularlypolarized antenna comprises a dielectric substrate, four bent T-shaped radiation units disposed above the dielectric substrate, a multi-L-shaped disposed under the radiation units and for coupled feeding, a ground plane disposed under the dielectric substrate, and four foam columns supporting the four bent T-shaped radiation units; and the lower end of the multi-L-shaped probe is connected to aninner conductor of a connector by coaxial feeding, and an outer conductor of the connector is connected with the ground plane. The invention relates to a bent T-shaped rotating structure based directional circularly polarized antenna, which adopts the multi-L-shaped probe feeding structure, a plurality of bent T-shaped radiating units, and the foam columns supporting radiation patches, effectivelyachieves circular polarization, directionality and miniaturization.

The invention relates to a PIFA, in particular to a PIFA with an Archimedes spiral EBG structure used as a floor board. The PIFA with the Archimedes spiral EBG structure used as the floor board solves the problems that an existing PIFA is low in radiant efficiency and large in overall size. The PIFA with the Archimedes spiral EBG structure used as the floor board comprises a radiation sheet, a short circuit plate, the floor board, a coaxial inner conductor and a coaxial outer conductor; the radiation sheet and the floor board are sequentially arranged side by side in parallel from top to bottom; the tip of the left end of the radiation sheet is connected with the tip of the left end of the floor board through the short circuit plate; the coaxial outer conductor is vertically arranged below the left end of the floor board, and the upper end of the coaxial outer conductor is connected with the lower surface of the left end of the floor board; the coaxial inner conductor is vertically arranged between the radiation sheet and the floor board, and the upper end of the coaxial inner conductor is connected with the lower surface of the left end of the radiation sheet. The PIFA with the Archimedes spiral EBG structure used as the floor board is applied to the field of wireless communication.

The invention provides a base station antenna reflecting board. The reflecting board is characterized by comprising a reflecting surface and at least two groups of side edges arranged on the reflecting surface, a first group of side edges is arranged at edges of two sides of the reflecting surface, a second group of side edges is arranged between the side edges of the first group, each group of side edges comprises two side edges which are mutually parallel and symmetrically distributed relative to a central axis of the reflecting surface, and an interval exists between any adjacent side edges. Simultaneously, an antenna device with multiple boundaries, which utilizing the antenna reflecting board, is provided, by means of multiple radiation side edge technology, the antenna beam bandwidth is widened, the convergence of the beam width is improved, and the planning and covering of the network are facilitated.

The invention relates to a multi-channel reverse-to-circle WIFI signal transmitting and receiving device. The device comprises a high-gain antenna device, and more than two equal wireless hotspot devices, band-pass filtering devices, frequency shifting devices and antenna switching devices which are connected in sequence, and the dual-polarization log-periodic antenna adopts a cross structure to realize dual polarization of two single-polarization antenna units, so that the signal polarization loss can be reduced; the antenna is dual-polarized and inverted, so that the radiation direction of the antenna faces the ground, the ground can reflect all radiated energy back, the back radiation of the antenna is reduced, the high-gain antenna device is designed to be of a three-dimensional array structure, a vertical beam can be formed, and the overall gain of the antenna is improved. The WIFI signals are moved to the low frequency band and then transmitted out, the coverage range of the WIFI signals can be increased, and the multi-channel inverse-to-circle WIFI signal receiving and transmitting device comprises a multi-input multi-output signal transmission channel, so that the use reliability is high.

The invention discloses an orthogonal elliptical-table-shaped dielectric resonator antenna for a 5G millimeter wave band. A main radiation unit is an orthogonal elliptical-table-shaped dielectric, andcompared with a metal material, the orthogonal elliptical-table-shaped dielectric resonator antenna is lower in ohmic loss, higher in efficiency, simple in structure and low in processing cost. The grooves on the dielectric surface can reduce the loss and improve the antenna gain. The orthogonal elliptical gap can be better attached to the orthogonal elliptical-table-shaped medium, and the coupling efficiency is higher. Simulation comparison shows that the gain of the orthogonal elliptical gap is higher than that of a common gap. Stripline feed can reduce backward radiation and improve the gain. Two circles of through holes are formed in the stripline, so that energy can be concentrated at the dielectric radiation unit, and the gain is further improved. Compared with the prior art, the antenna can obtain higher gain in a 5G millimeter wave band, the highest gain reaches 13.52 dB, and the bandwidth reaches 3.95 GHz.