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49results about How to "Reduce back radiation" patented technology
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P-band broadband high-isolation double circularly-polarized thin-film array antenna
InactiveCN104852158AIncrease in sizeLower Q valueRadiating elements structural formsIndividually energised antenna arraysCardboardHigh isolation
The invention belongs to the field of communication technology and specifically relates to a P-band broadband high-isolation double circularly-polarized thin-film array antenna. The array antenna successively comprises, from top to bottom, a parasitic patch layer, a radiation patch layer, a cellular cardboard dielectric layer having a supporting effect, and a rasterized metallic reflecting plate layer. Each of the top surface of the parasitic patch layer and the top surface of the radiation patch layer is equipped with M*N square copper patches. The top surface of the cellular cardboard dielectric layer is a ground layer and M*N pairs of vertical H-shaped slits are etched on the top surface of the cellular cardboard dielectric layer. The bottom surface of the cellular cardboard dielectric layer is a feed network layer. A feed network is formed by M 3dB bridges and M pairs of one-to-eight T-shaped power dividers which are connected. A signal is transmitted via the feed network and is coupled to the radiation patches and the parasitic patches via the H-shaped slits. The rasterized metallic reflecting plate layer is arranged at a position under the feed network layer and a quarter wavelengths away from the feed network layer. The array antenna is a flexible foldable and deployable structure, decreased in weight, increased in bandwidth, and capable of achieving left-hand circular polarization and right-hand circular polarization.
Owner:FUDAN UNIV
Antenna for reducing radar scattering cross section
InactiveCN102176537ASimple structureEasy to processRadiating elements structural formsAntenna earthingsCapacitanceScattering cross-section
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.
Owner:XIDIAN UNIV
High-gain G-shaped dual-frequency monopole antenna with loaded dual-frequency AMC reflection plate
InactiveCN103367881ASimple structureCompact structureSimultaneous aerial operationsRadiating elements structural formsDual frequencyHigh-gain 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.
Owner:BEIJING UNIV OF POSTS & TELECOMM
SIC technology-based four-element dual-polarization microstrip antenna array
InactiveCN108493626ABandwidthHigh bandwidthParticular array feeding systemsIndividually energised antenna arraysMicrostrip antenna arrayBroadband
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.
Owner:HARBIN ENG UNIV
UHF RFID Reader with Improved Antenna System
InactiveUS20150269400A1Quality improvementReduce back radiationSubscribers indirect connectionIndependent non-interacting antenna combinationsGround planeWavelength
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.
Owner:TAGSYS
Chip integrated waveguide dual-frequency broad-band slot array antenna unit
InactiveCN1700514AEasy to integrateLow costAntenna arraysRadiating elements structural formsDual frequencyCommunications system
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.
Owner:SOUTHEAST UNIV
Base station antenna for 2G/3G frequency band based on electromagnetic band gap reflection base plate
InactiveCN105552543AReduce weightReduce back radiationRadiating elements structural formsAntennas earthing switches associationElectromagnetic band gapGround plate
The invention discloses a base station antenna applied in 2G / 3G frequency band based on an electromagnetic band gap reflection base plate, comprising a radiation unit and a reflection plate; the radiation unit comprises two pairs of square dipoles which are in crossed symmetrical arrangement; two pairs of alternated square dipoles are equipped with feed cards; inverse L-shaped feed probes are arranged on the feed cards; baluns are connected to the centers of the lower sides of the two pairs of square dipoles ; the baluns are connected and fixed at the center of an FR4 media base plate; an electromagnetic band gap unit is arranged at one side of the FR4 media base plate; the other side is an earth plate; the electromagnetic band gap unit is composed of metal patches; the metal patches are connected with the earth plate through conductive through holes arranged at the centers; the working frequency of the 2G / 3G base station antenna is fully covered; the electromagnetic band gap is taken as the reflection base plate of the base station antenna; the backward radiation of the base station antenna is reduced by using the particular forbidden band feature and high impedance feature of the structure; and the integrated weight of the antenna is reduced.
Owner:张晓燕
Broadband metasurface antenna based on differential dielectric resonator feeding
ActiveCN111799549AImprove design flexibilityHigh bandwidthRadiating elements structural formsAntenna earthingsDielectric plateBroadbanding
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.
Owner:XIDIAN UNIV
Slot-coupled broadband single-feed circularly polarized microstrip antenna
PendingCN111864379AImprove performanceGood symmetryRadiating elements structural formsAntenna earthingsRadio frequency signalEngineering
The invention provides a slot-coupled broadband single-feed circularly polarized microstrip antenna. The slot-coupled broadband single-feed circularly polarized microstrip antenna comprises a first radiation patch, an air supporting structure, a second radiation patch and a metal grounding plate which are arranged from top to bottom in a covering manner, and the first radiation patch and the second radiation patch are provided with corner cut structures. The first radiation patch and the second radiation patch are both pasted on the dielectric layer. The air supporting structure is of a rectangular-ambulatory-plane narrow frame structure. The top of the metal grounding plate is provided with a coupling gap, the bottom of the metal grounding plate is provided with a feed dielectric layer, aradio frequency signal feeder line is arranged below the coupling gap, and the radio frequency signal feeder line penetrates through the feed dielectric layer and feeds to the first radiation patch and the second radiation patch. According to the microstrip antenna adopted by the invention, the coupling gap size is reduced, network layout is facilitated, an air layer is improved, and the production cost is reduced.
Owner:陕西天鼎无线技术股份有限公司
Two-dimensional groove directed microstrip paster antenna
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.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Hybrid single aperture inclined antenna
ActiveUS20100328161A1Suitable for integrationMinimize couplingAntenna arraysSimultaneous aerial operationsPlanar substrateEngineering
In an exemplary embodiment, an antenna architecture comprises a single aperture having both receive elements and transmit elements, where the single aperture has the performance of a dual-aperture but in about half the size. Moreover, in the case of an array with inclined elements, there is the need to interconnect a planar substrate with an inclined substrate at an angle. An exemplary single aperture comprises a metal core having a thick pass-through slot from a first side to a second side; connecting the inclined substrate to the first side of the metal core, and connecting a second substrate to the second side of the metal core. Furthermore, an RF signal is communicated between the first substrate and the second substrate in a contactless manner through the thick pass-through slot.
Owner:VIASAT INC
Small broadband monopole antenna having perpendicular ground plane with electromagnetically coupled feed
ActiveUS20060256015A1Minimize impactReduce back radiationSimultaneous aerial operationsAntenna supports/mountingsPhysicsMonopole antenna
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.
Owner:SAMSUNG ELECTRONICS CO LTD
Multifrequency antenna
ActiveCN101677148ASmall sizeReduce back radiationSimultaneous aerial operationsRadiating elements structural formsResonanceEngineering
A multifrequency antenna is provided on a substrate. The antenna includes a plurality of flexible probes, a feed-in portion, a grounding portion and an antenna body. The feed-in portion is connected to the substrate for feed-in of electromagnetic wave signals. The grounding portion is connected to the substrate. The antenna body is in electric connection with the feed-in portion and the groundingportion, for transmitting and receiving electromagnetic wave signals. The antenna body includes a first radiation body, a second radiation body, a first resonance body and a second resonance body. The first radiation body is connected to the feed-in portion. The second radiation body is connected to the first radiation body and grounding portion. The first resonance body is connected to the second radiation body. The second resonance body is connected to the second radiation body, the first resonance body and the second resonance body are parallel and have unequal lengths. The inventive multifrequency antenna utilizes resonance bodies with unequal lengths to realize covering of a plurality of 2.4 and 5.X frequency bands.
Owner:QIDONG DONGLAI ROLLING SALLSCREW
2T2R symmetric antenna system and multiple-input-multiple-output power equalization method
ActiveCN110635251AReduce back radiationRadiation signal coverage is consistentParticular array feeding systemsRadio transmissionComputer moduleRadio frequency signal
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.
Owner:内江喜马雅拉网络技术有限公司
Dual-polarized microstrip phased-array antenna unit and array thereof
ActiveCN112838360ASuppress couplingImprove isolationRadiating elements structural formsAntennas earthing switches associationFeeder lineSide lobe
The invention relates to a dual-polarized microstrip phased-array antenna unit, which comprises a radiation structure, a feed structure and a metal back cavity, and is characterized in that the radiation structure comprises a first dielectric layer and a second dielectric layer, a parasitic patch is arranged on the lower surface of the first dielectric layer, a radiation patch is arranged on the upper surface of the second dielectric layer, and the radiation patch and the parasitic patch are oppositely arranged; the feed structure comprises a third dielectric layer, a grounding plate, a fourth dielectric layer, a first polarization feeder line and a second polarization feeder line, the grounding plate is arranged between the third dielectric layer and the fourth dielectric layer, the first polarization feeder line is arranged between the second dielectric layer and the third dielectric layer, and the second polarization feeder line is arranged on the lower surface of the fourth dielectric layer. According to the phased-array antenna, the antenna unit adopts the broadband microstrip unit coupled by multiple layers of patches, the metal back cavity is added below the antenna to control backward stray radiation, and the phased-array antenna obtained by adopting the antenna unit can achieve the effects of broadband wide-angle scanning, high isolation, low side lobe, high front-to-back ratio and low profile at the same time.
Owner:ZHEJIANG GEELY HLDG GRP CO LTD +1
Low-profile miniaturized decoupling structure based on patch MIMO antenna
ActiveCN113178689ADoes not increase spacingConducive to integrated designRadiating elements structural formsIndividually energised antenna arraysCommunications systemMimo antenna
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.
Owner:NANJING UNIV OF SCI & TECH
Novel handset antenna
ActiveCN104466374ASmall sizeReduce back radiationRadiating elements structural formsAntennas earthing switches associationPhysicsHandset
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.
Owner:ZTE INTELLIGENT IOT TECH
Exhaust pipe type embellished antenna
ActiveCN104037507AReduce the impact of radiation indicatorsReduce the impactAntennasAntenna radiationEngineering
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.
Owner:COMBA TELECOM TECH (GUANGZHOU) CO LTD
Antenna system having electromagnetic bandgap
InactiveUS8044862B2Improve directivityReduce antenna sizeAntenna arraysSimultaneous aerial operationsElectrical conductorFeed line
An antenna system includes an antenna transmitting and receiving a signal; a power feeding line feeding electric power to the antenna; and a metal conductor ground electrically connected to the power feeding line. Further, the metal conductor ground includes an electromagnetic bandgap.
Owner:ELECTRONICS & TELECOMM RES INST
Bent T-shaped rotating structure based directional circularly polarized antenna
InactiveCN108493572AAchieving Circular Polarization DesignRealize small form factor designAntenna supports/mountingsRadiating elements structural formsCircularly polarized antennaElectrical conductor
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.
Owner:HARBIN ENG UNIV
A dual-frequency ebg structure and a microstrip antenna based on the dual-frequency ebg structure
ActiveCN107134637BGood radiation characteristicsSuppression of surface wavesSimultaneous aerial operationsRadiating elements structural formsMicrostrip patch antennaDielectric substrate
The invention discloses a dual-frequency EBG structure, which comprises a metal grounding plate, a dielectric substrate, a plurality of EBG metal patches arranged periodically and conductive via holes, and the EBG metal patches and metal grounding plates are respectively located on the upper and lower surfaces of the dielectric substrate , the conductive via hole is set in the center of the EBG metal patch to connect the EBG metal patch and the metal grounding plate, and the four surrounding edges of the EBG metal patch are etched with four rectangular slots symmetrically distributed about the center of the EBG metal patch and four four One-third circular groove. A microstrip antenna based on a dual-frequency EBG structure, including a microstrip patch antenna and a dual-frequency EBG structure with the above structure loaded around it, the microstrip patch antenna is located on the upper surface of a dielectric substrate and the antenna radiation patch it uses Two symmetrical rectangular slots and C-shaped bent branch slots are etched on the chip. By loading the EBG structure around the microstrip antenna, the surface wave of the antenna is suppressed, the working bandwidth of the antenna is improved, the gain of the antenna is increased, and the back radiation of the antenna is reduced.
Owner:EAST CHINA JIAOTONG UNIVERSITY
Ultra-wide-band dual-notch paster antenna adopting wide-attenuation-band electromagnetic band gap structure
ActiveCN102723601BReduce volumeReduce weightRadiating elements structural formsAntenna earthingsUltrasound attenuationCoaxial line
Owner:BEIHANG UNIV
Multi-mode broadband high-power directional transmitting longitudinal vibration underwater acoustic transducer
PendingCN112530392ABandwidthReduce back radiationTransducers for subaqueous useSound producing devicesResonant cavityBroadband transmission
The invention discloses a multi-mode broadband high-power directional transmitting longitudinal vibration underwater acoustic transducer, which relates to the field of underwater acoustic transducers,and comprises a longitudinal vibration transducer vibrator with a flexible ring, a square cylindrical structure resonant cavity shell, a decoupling support structure and a tail sealing end cover, wherein the longitudinal vibration transducer vibrator with the flexible ring is composed of a front cover plate with the flexible ring, a piezoelectric ceramic crystal pile, a stress screw rod and a rear cover plate. According to the liquid cavity coupling principle, a liquid coupling cavity in a square cylinder structure is designed at the front end of a front cover plate of a vibrator of the longitudinal vibration transducer with the flexible ring, and a new resonance peak can be generated between two resonances of the double-cover-plate longitudinal vibration transducer. The beneficial effects of the invention are that the multi-mode broadband high-power directional transmitting longitudinal vibration underwater acoustic transducer is wider in frequency band, and can achieve broadband transmission in a range of medium and low frequencies from 2.5 Hz to 7.5 Hz; backward radiation in a working frequency band is small, and the unidirectional radiation capacity is high; the structural size can be adjusted according to actual engineering requirements, and the deep-water working capacity, the adaptability and the flexible arrangement are achieved.
Owner:THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
A Microwave Ablation Antenna Based on Helical Slot Structure
ActiveCN111012483BEasy to processLow costSurgical needlesSurgical instruments using microwavesMicrowaveCoaxial line
The invention discloses a microwave ablation antenna based on a spiral slot structure. The microwave ablation antenna includes a conical ablation needle, a semi-rigid coaxial needle rod, the front end of the semi-rigid coaxial needle rod is connected to the end of the ablation needle, and several optimized spirals are formed on the outer conductor behind the connection. The slots radiate, and there are no or several annular slots behind the helical slots for impedance matching and radiation. The energy is transmitted in the semi-rigid coaxial line and radiated efficiently at the slots. The microwave ablation needle of the present invention has low microwave energy transmission consumption, and the energy radiates efficiently at the helical gap, mainly concentrated at the front end of the ablation antenna, effectively suppressing the backward radiation, thereby providing a new structure for minimally invasive or non-invasive microwave tumor treatment.
Owner:SOUTH CHINA UNIV OF TECH
PIFA with Archimedes spiral EBG structure used as floor board
ActiveCN104241820ASuppression of surface wavesBack radiation suppressionRadiating elements structural formsAntenna earthingsElectrical conductorEngineering
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.
Owner:HARBIN INST OF TECH
An antenna device with multiple boundaries and its reflector
ActiveCN102790284BRadiation Performance ControlHigh reference valueSeparate antenna unit combinationsEngineeringRadiation
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.
Owner:TONGYU COMM INC
Exhaust pipe type beautification antenna
ActiveCN104037507BReduce the impact of radiation indicatorsReduce design difficultyAntennasMulti bandEngineering
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.
Owner:COMBA TELECOM TECH (GUANGZHOU) CO LTD +1
Reconfigurable Sensing Antenna Based on Contactless Rotational Coupling
ActiveCN108695596BReduce volumeEasy to installAntenna supports/mountingsRadiating elements structural formsDielectric plateRadiation field
The invention, which belongs to the technical field of antennas, particularly relates to a reconfigurable sensing antenna based on non-contact rotational coupling. The antenna is composed of a metal patch, a dielectric plate, a grounding plate and a back cavity that are arranged successively from top to bottom. The back cavity is a cylindrical cavity with the empty upper top surface. The groundingplate is connected with the back cavity in a matching manner as the upper top surface of the cylinder; and a feed slot is etched in the grounding plate and is connected with an RFID chip. A support rotating shaft is arranged at the center of the back cavity and is connected with the dielectric plate. The metal patch is in close contact with the dielectric plate; and the support rotating shaft drives the metal patch by the dielectric plate to move relatively to the feed slot. The feed slot generates a radiation filed after being excited by the RFID chip and is coupled to the metal patch; the support rotating shaft converts the mechanical rotator of the sensor into the rotation angle of the metal patch, so that the resonant frequency of the antenna is changed; and the reader reads the resonant frequency of the antenna to obtain the mechanical rotator of the sensor.
Owner:TSINGHUA UNIV
Multi-channel reverse-to-circle WIFI signal transmitting and receiving device
PendingCN113555672AReduce back radiationReduce signal polarization lossLogperiodic antennasAntenna supports/mountingsTelecommunicationsLow frequency band
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.
Owner:SHENZHEN WAVE TELECOMM TECH CO LTD
Orthogonal elliptical-table-shaped dielectric resonator antenna for 5G millimeter wave band
ActiveCN111710981AHigh gainReduce lossRadiating elements structural formsAntenna earthingsDielectric surfaceWave band
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.
Owner:NANJING UNIV OF INFORMATION SCI & TECH
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