78results about How to "Increased Axial Ratio Bandwidth" patented technology

The invention relates to a miniaturized single feed point dual-frequency and dual-polarization microstrip antenna. The upper surface of a substrate base plate is provided with a first radiation patch and a second radiation patch; the first radiation patch and the second radiation patch are chamfering patches which are symmetrically chamfered in a diagonal position; the second radiation patch is annular, the first radiation patch is positioned in a cavity of the second radiation patch, and the first radiation patch and the second radiation patch have a same center; the lower surface of the substrate base plate is provided with a conduction grounding plate; coaxial probe feed vertically penetrates through the substrate base plate and is directly connected with the first radiation patch to generate electric coupling, and the second radiation patch is electromagnetically coupled with the first radiation patch. The invention realizes dual-frequency circular polarization, has the characteristics of small size, low section, simple manufacture process, low cost, favorable axial ratio bandwidth and higher low-elevation gain and can be used for a high-performance satellite navigation systemreceiver. Meanwhile, the requirements of vehicle-carried equipment on the volume and weight of the antenna can be met.

The invention discloses a substrate integrated waveguide technology-based high-gain circularly polarized antenna array and a manufacturing method of the antenna array. The broadband substrate integrated waveguide circularly polarized antenna array comprises an upper-layer radiation substrate and a lower-layer feed substrate, wherein the radiation substrate comprises a first antenna unit, a second antenna unit, a third antenna unit and a fourth antenna unit, and the first antenna unit, the second antenna unit, the third antenna unit and the fourth antenna unit are symmetrically arranged by taking the center of a circle as an axis; a radial substrate integrated waveguide power distributor which is divided into four parts is distributed on the feed substrate and is used for feeding the four antenna units. The high-gain circularly polarized antenna array disclosed by the invention has the advantages that the gain is high, the broadband is wide, the radiation characteristic is good, the design is simple, the machining is easy and the cost is low; compared with the current substrate integrated waveguide circularly polarized antenna, the antenna provided by the invention has the advantages that the gain is remarkably improved and the circularly polarized bandwidth is remarkably increased.

The invention discloses a broadband low-section omni-directional circularly polarized antenna. A dielectric substrate of the broadband low-section omni-directional circularly polarized antenna comprises an upper-layer dielectric substrate and a lower-layer dielectric substrate, the upper-layer dielectric substrate and the lower-layer dielectric substrate are parallel to each other, and the upper-layer dielectric substrate is positioned right above the lower-layer dielectric substrate; a metal floor is adhere on the lower-layer dielectric substrate; a zero-order resonator, a parasitic radiator and a radiation type feeding network are adhered on the upper-layer dielectric substrate; the radiation type feeding network is positioned in the center of the upper-layer dielectric substrate; zero-order resonant patches of the zero-order resonator are annularly on the outer side of the radiation type feeding network, one end of each zero-order resonant dowel of the zero-order resonator is connected with the corresponding zero-order resonant patch, and the other end of each zero-order resonant dowel is connected with the metal floor; parasitic radiation patches are annularly arranged on the outer sides of the zero-order resonant patches, one end of each parasitic radiation dowel of the corresponding parasitic radiation patch is connected with the corresponding parasitic radiation patch, and the other end of each parasitic radiation dowel is suspended. The broadband low-section omni-directional circularly polarized antenna has the advantages that impedance of the broadband low-section omni-directional circularly polarized antenna and the bandwidths of directional diagrams can be increased, and excellent axial ratio characteristics can be kept.

The invention discloses a microstrip sequential rotation array antenna based on a series and parallel feeding network. A first antenna unit, a second antenna unit, a third antenna unit and a fourth antenna unit in the array antenna are arranged on a first lambda / 4 microstrip impedance transformation line, a second lambda / 4 microstrip impedance transformation line, a third lambda / 4 microstrip impedance transformation line and a fourth lambda / 4 microstrip impedance transformation line in the series and parallel feeding network according to the serial rotation way; a feeding input end, a first feeding section, a second feeding section and a third feeding section on the series and parallel feeding network are serially arranged to form a three-quarter circular ring according to the signal input and output flow direction. The single antenna unit in the array antenna adopts the square corner cut patch design way, the processing and the forming are simple; furthermore, the single antenna unit adopts the microstrip line feeding way of allocating branches by bending, thereby being capable of leading a plurality of antenna units to conveniently constitute the array and configure at the same time of matching. When in array constituting process, the serial rotation array way and the series and parallel feeding network are adopted, thereby significantly improving the impedance bandwidth and the circular polarization purity of the antenna, reducing the loss of a feeding line and improving the gain.

The invention relates to a double-frequency antenna comprising an upper-layer microstrip antenna, a lower-layer microstrip antenna, a baffle board and a phase shift feeding network, wherein the upper-layer microstrip antenna and the lower-layer microstrip antenna are fixed on the front of the baffle board through screws after being overlapped; the phase shift feeding network is positioned at the back of the baffle board; the upper-layer microstrip antenna carries out feeding through a double-feeding needle; the lower-layer microstrip antenna carries out coupled feeding through a via hole corresponding to the feeding needle of the upper-layer microstrip antenna on a radiating patch of the lower-layer microstrip antenna; and the feeding needle of the upper-layer microstrip antenna passes through the via hole to reach to the phase shift feeding network. The double-frequency antenna has a small size, a firm structure and a simple process and also has favorable axis ratio bandwidth and low elevation gain.

The invention relates an omni-directional circularly-polarized antenna, specifically a broadband wide-angle omni-directional circularly-polarized antenna. The antenna solves the problem that existing omni-directional circularly-polarized antenna cannot realize omni-directional polarization on multi-azimuth plane. The broadband wide-angle omni-directional circularly-polarized antenna comprises a round radiation plaster, a medium baseplate and a circular grounding plate, wherein the edges of circular radiation plaster and the circular grounding plate are provided with M upper and lower bending branches; each upper bending branch is composed of a micro-strip line extending along radial direction and an arc short section line clockwise extending along circumferential direction; each lower bending branch is composed a micro-strip line extending along radial direction and an arc short section line anticlockwise extending along circumferential direction; the included angle between the micro-strip lines of upper and lower bending branches is Alpha; N short-circuit via holes in isometric arrangement along circumferential direction are set between the circular radiation plaster and the circular grounding plate. The invention is applicable to wireless communication.

The invention belongs to the technical field of antenna, and provides an LTCC double-layer single-feed circularly polarized microstrip patch array antenna unit, for solving the contradiction that a current circularly polarized microstrip patch array antenna needs to consider both low profile, circular polarization, high gain, and broadband development. In the LTCC double-layer single-feed circularly polarized microstrip patch array antenna unit, an upper layer of radiation metal patch and a lower layer of radiation metal patch are different in the size; the resonant frequency point of the lower layer of radiation metal patch is higher than the center frequency of the antenna unit; the resonant frequency point of the upper layer of radiation metal patch is lower than the center frequency ofthe antenna unit; the chamfer size of the lower layer of radiation metal patch is greater than the chamfer size of the upper layer of radiation metal patch; and the chamfer size of the upper and lower layers of radiation metal patches enables the single point feed square patch to generate two orthogonal degeneration modes with the same amplitude to form a 90 DEG phase difference. The LTCC double-layer single-feed circularly polarized microstrip patch array antenna unit utilizes the upper and lower radiation metal patches with the same shape and different size, thus being able to preferably consider both the performance demands for low profile and circular polarization of the microstrip patch chip, and greatly improving the frequency band bandwidth of the antenna.

A slotted waveguide antenna for receiving circularly polarized waves capable of improving impedance matching, an axial ratio and an axial ratio bandwidth by additionally forming a dielectric plate between a conductive plate having waveguides and a polarizer of an uppermost layer is disclosed. The slotted waveguide antenna for reception of circularly polarized waves, which includes a lower conductive plate and an intermediate conductive plate which are coupled to each other to have a feeding line and a waveguide to which satellite frequency signals are transmitted and an upper conductive plate which is coupled to an upper portion of the intermediate conductive plate and has a plurality of cavities and slots to communicate with the waveguide so as to transmit and receive satellite frequency signals, includes a polarizer with strip conductors for converting linearly polarized waves into circularly polarized waves and matching stubs which are formed at an upper portion of the upper conductive plate, and a dielectric plate which is disposed between the upper conductive plate and the polarizer (100) to perform impedance matching with space impedance.

The invention provides a polarization reconfigurable broadband omnidirectional antenna. According to the invention, the polarization reconfigurable characteristic can be achieved under the condition of ensuring the broadband circular polarization omnidirectional property of the antenna. The antenna comprises a dielectric substrate, a radiation unit, a floor, a monopole radiator and a direct current circuit unit. The radiation unit comprises an annular patch printed on the upper surface of the dielectric substrate, a metal patch in a ring and a microstrip line which is connected with the annular patch and the metal patch. The periphery of the metal patch is provided with the gap and a parasitic coupling patch, so that the broadband characteristic of the antenna is ensured. The annular patchand an arc patch printed on the lower surface of a dielectric substrate are provided with diodes, and are connected with each other through a first metalized through hole, so that the polarization reconfigurable characteristic is realized. The monopole radiator penetrates through the through holes in the floor and the dielectric substrate and is connected with the metal patch. The direct currentcircuit unit comprises a grounding patch, a power supply patch and a second metalized through hole for connecting the grounding patches on the upper surface and the lower surface of the dielectric substrate.

The invention relates to an air measurement type antenna device, which comprises a first signal receiving unit, a second signal receiving unit, a circuit board and a tuning unit, wherein the first signal receiving unit comprises a substrate and a microstrip patch layer, the second signal receiving unit comprises a metal piece and a grounding piece, the metal piece is connected with the circuit board through the grounding piece, the substrate is arranged on the metal piece, and the microstrip patch layer is arranged on the substrate and shares an air radiation medium layer with the metal piece; and the tuning unit comprises a fixed plate, first tuning sawteeth and a plurality of second tuning sawteeth; the fixed plate is arranged on the circuit board, the first tuning sawteeth are uniformly arranged on the metal piece, and the second tuning sawteeth are in one-to-one correspondence relation with the first tuning sawteeth. According to the invention, the first tuning sawteeth and the second tuning sawteeth are arranged in a one-to-one correspondence mode, so that the first tuning sawteeth and the second tuning sawteeth are arranged as many as possible in the limited area, thereby well improving performance parameters such as the axis ratio bandwidth, the beam bandwidth, low-elevation radiation gain and the like while realizing a miniaturized structure.

The invention discloses a C-wave-band miniature broadband wide-beam circular polarization microstrip antenna. The C-wave-band miniature broadband wide-beam circular polarization microstrip antenna iscomposed of a medium cavity layer, a parasitic layer, a connection layer, a radiation layer and a feed layer which are stacked up and are attached to one another in sequence from top to bottom. Circular polarization is achieved through double-point feed, a feed network adopts an equal-amplitude Wilkinson power divider which divides one into two and has the 90-degree phase position difference. Radiation of a grounded metal column is similar to that of a monopole antenna, the radiation pattern of the grounded metal column is omni-directional, and the metal column is loaded so that the half powerbeam width of the microstrip antenna can be increased. A square ring generates a horizontal polarization electric field which is used for balancing an additional vertical polarization electric fieldof the metal column, the beam width is increased, and meanwhile the axial ratio property of the antenna is improved. By introducing the stacked-up structure of parasitic patches, the impedance bandwidth of the antenna is increased, the parasitic patches are subjected to circular arc chamfering, and the axial ratio bandwidth and 3dB axial ratio beam width of the antenna are further improved.

A dual-band circularly polarized microstrip antenna disclosed by the present invention mainly solves the problems in the prior art that the dual-band circularly polarized microstrip antenna is narrower in impedance matching bandwidth and axis ratio bandwidth and larger in structural size. The dual-band antenna comprises an antenna radiation unit (1), a dielectric substrate (2) and a metal grounding plate (3), the antenna radiation unit and the metal grounding plate are located on the upper and lower surfaces of the dielectric substrate respectively and are connected with a SMA joint (4) arranged at the bottom of the dielectric substrate, the antenna radiation unit is formed by connecting an impedance matching microstrip line (11), a circular arc-shaped microstrip line (12) a T-shaped microstrip line (13) and an L-shaped microstrip line (14), and the T-shaped microstrip line and the L-shaped microstrip line are used to control the radiation characteristics of the low and high frequency bands of the antenna respectively. The experiments show that the impedance and axis ratio bandwidths of the present invention can satisfy the demands of a wireless local area network (WLAN), and the antenna can be applied to a modern wireless communication system and a satellite navigation positioning system.

The invention discloses a circularly-polarized broadband base station antenna. The circularly-polarized broadband base station antenna comprises an antenna radiation unit, a feed structure and a baffle board, wherein the antenna radiation unit is fixed to the baffle board through the feed structure, the feed structure is perpendicularly placed between the antenna radiation unit and the baffle board, and the antenna radiation unit comprises a main radiation ring, a spurious ring and a radiation unit dielectric substrate. Due to the facts that grooving is carried out at an appropriate position of an annular structure to achieve circular polarization, the spurious ring is used for strengthening the circularly-polarized bandwidth, and a high-impedance bandwidth is obtained through micro-strip and gap coupling feed, and the circularly-polarized broadband base station antenna is stable in radiation pattern, the gain can reach 9dBi, and the circularly-polarized broadband base station antenna is suitable for serving as an antenna of a mobile communication base station.

The invention provides a dual-frequency circularly polarized antenna based on a substrate integrated waveguide, which is used for solving the technical problems that the antenna impedance bandwidth and the axis ratio bandwidth are narrow in the prior art. Comprises a first dielectric plate, and a laminated structure composed of a second dielectric plate arranged vertically and a third dielectric plate, wherein the upper surface of the first dielectric plate is provided with a metal patch, and two rectangular patches on the upper surface of the second dielectric plate are provided with perturbation grooves; An upper surface and a low surface of that third dielectric plate are respectively provided with a first, second metal layer, A metal through-hole is connected through a plurality of metallized through-holes, A substrate integrate waveguide is composed of a first metal lay etched with a rectangular groove, two rectangular patches are coupled fed to generate circularly polarize waves,a pair of metal patches with tangential corners are printed on that upper surface of the first dielectric substrate, a metal probe is introduced to feed the metal patches, and the circularly polarized waves are generated in another frequency band to realize dual-frequency operation. It can be used in satellite communication, remote sensing and telemetry and other fields.

The invention relates to a dual-band omnidirectional coupling branch loaded spiral antenna and a manufacturing method thereof. The spiral antenna comprises a flexible dielectric substrate, wherein theflexible dielectric substrate is provided with a spiral antenna main body and a short circuit strip, the flexible dielectric substrate is connected with a grounding plate, the short circuit strip isperpendicular to the grounding plate, and the short circuit strip and the grounding plate are provided with a feed port therebetween; the spiral antenna main body comprises a main body radiation spiral arm I, a coupling branch spiral arm I, a main body radiation spiral arm II and a coupling branch spiral arm II which are sequentially arranged at equal intervals along an extension direction of theshort circuit strip, the starting points of the main body radiation spiral arm I and the main body radiation spiral arm II are located on the short circuit strip, and the starting points of the coupling branch spiral arm I and the coupling branch spiral arm II are close to the short circuit strip. The dual-band omnidirectional coupling branch loaded spiral antenna not only can obtain an omnidirectional antenna operating at dual bands, but also adopts a four-arm single-feed technology, is novel in structure and improves the consistency and the product reliability.

The invention discloses a two-dimensional millimeter wave circularly-polarized wide-angle scanning phased-array antenna, and relates to the technical field of millimeter wave antennas. According to the technical scheme, an antenna radiation patch is connected with a rectangular parasitic patch through a high impedance matching microstrip line which is provided with a cross-carved equal length in the center and is used for carrying out impedance matching on the antenna, and a windmill-shaped microstrip radiation patch excitation equal-amplitude in-phase polarization orthogonal degenerate mode is manufactured on the symmetric center of a diagonal bisector of the corner of the antenna radiation patch; feed probes penetrate through the antenna dielectric layer and are connected with the antenna radiation patch through the four rectangular parasitic patches, the four feed probes 4 of each antenna unit feed through rotary feed structures which are equal in amplitude and sequentially differ by 90 degrees, and the windmill-shaped microstrip radiation patch is connected with rectangular blocks of the four rectangular parasitic patches of the four metallized probes for feed. feeding in equal-amplitude excitation with the phase difference of 90 degrees is performed in sequence to form circular polarization radiation, and the antenna arrays are arranged in a rectangular manner at equal intervals according to unit intervals to form an antenna array surface.

The invention discloses a broadband polarization reconfigurable antenna based on a cross dipole and a parasitic unit. The antenna comprises a cross dipole radiation unit, a parasitic radiation unit, achip capacitor, a 3 / 4 feed square ring, an insulating support column, a coaxial feed line unit, a reflecting plate, a PIN diode switch, a microstrip line feed unit and a dielectric substrate; the cross dipole radiation unit, the parasitic radiation unit, the microstrip line feed unit, the embedded PIN diode switch and the chip capacitor are etched on the dielectric substrate. A basic unit of thecross dipole is a butterfly-shaped unit with two orthogonal arms, and the two arms of the butterfly-shaped unit are connected through the 3 / 4 feed square ring; slits are formed in the outer sides of the joints of the feed square ring and the arms; and the PIN diode switch is arranged between the microstrip line feed unit and the cross dipole unit. The antenna has the advantages of small size, light weight, simple structure, wide ultra-wideband and the like, and three working modes can be achieved by controlling on-off of the two PIN diode switches.

The invention provides a broadband circularly polarized electromagnetic dipole antenna, which comprises a metal floor, an electromagnetic dipole, a feed structure, an L-shaped metal plate and four L-shaped parasitic branches. The metal floor is of a rectangular structure. The electromagnetic dipole comprises two dipole arms rotationally symmetrical about the central normal of the metal floor. Eachdipole arm is composed of a first rectangular metal plate vertically fixed to the metal floor and a second rectangular metal plate vertically connected with the first rectangular metal plate. The feed structure is a Gamma-shaped structure, is fixed at the center of the surface of the metal floor, is located between the two dipole arms and is used for feeding the two dipole arms in a coupled way.The technical problems of narrow impedance bandwidth and axial ratio bandwidth and low gain of the existing electromagnetic dipole antenna are solved. The broadband circularly polarized electromagnetic dipole antenna can be used in wireless communication systems such as a mobile base station and an indoor distribution system.

The invention relates to a dual-frequency antenna. The dual-frequency antenna comprises an upper microstrip antenna, a lower microstrip antenna, a reflector plate and two phase shifting feed networks, wherein the upper microstrip antenna and the lower microstrip antenna are fixed to the front surface of the reflector plate by bolts after being overlapped; the phase shifting feed networks are positioned on the back surface of the reflector plate; and both the upper microstrip antenna and the lower microstrip antenna feed through a dual-fed pin. The dual-frequency antenna not only is easy to realize, but also has a small volume, a good axial ratio bandwidth and a low elevation gain.

The invention provides a circularly polarized orbital angular momentum antenna, used for improving antijamming capability of the antenna and comprising N antenna units, N is more than or equal to 3, each antenna unit comprises a dielectric material plate as well as a radiation patch printed on one side surface of the dielectric material plate and a radiation floor printed on the other side surfaceof the dielectric material plate, the shape of the radiation patch is a square provided with cut corners at any across corners, and the radiation patch is connected with the radiation floor by virtueof a coaxial line; and the N antenna units are arranged to form a hollow columnar structure, one side, printed with the radiation patch, of each antenna unit is located at the outer side of the hollow columnar structure, a conformal array is formed, amplitudes of excitation signals of all the antenna units are equal, and adjacent antenna units have continuous phase delay (described in the specification), wherein l is a mode number carrying orbital angular momentum and meets the condition that l is more than -N / 2 and less than N / 2. The antenna provided by the invention can produce vortex electromagnetic waves in multiple modes and with circular polarization and orbital angular momentum dual characteristics, and the antijamming capability of the antenna is effectively improved.

The invention belongs to the field of the millimeter wave antenna, and provides a broadband high-efficiency and high-gain circular-polarized array antenna which is suitable for a wireless communication system in Terahertz band. The broadband high-efficiency and high-gain circular-polarized array antenna comprises a broadband circular-polarized sub-array antenna unit and a broadband feed network; the broadband circular-polarized sub-array antenna unit comprises a sub-array feed network, a complementary phase shifter and a radiation unit; the sub-array feed network comprises a feed structure, a power-division coupling cavity structure and a coupling gap arranged on the upper surface of the power-division coupling cavity structure; the power-division coupling cavity structure is a square cavity having four corners with chamfers, and a perturbation structure is arranged at the centre of each of four sides; a coupling gap is correspondingly formed at each chamber position as the dual-polarized output port; the output port is connected with the complementary phase shifter, and the output end of the complementary phase shifter is connected with a radiation unit. The antenna provided by the invention adopts the broadband power-divider structure and the broadband phase shifter structure, so that the wide axial ratio bandwidth (more than 28.5%) and standing wave bandwidth (more than 28.5%) are provided.

The invention discloses a circular polarization microstrip antenna. The circular polarization microstrip antenna comprises a medium substrate, a first radiation paster, a second radiation paster, a grounding board and a coaxial cable, wherein the medium substrate comprises a first surface and a second surface which are opposite to the first surface, the first radiation paster is attached to the first surface of the medium substrate, the second radiation paster is embedded in the medium substrate and is in parallel with the first radiation paster, the grounding board is attached to the second surface of the medium substrate, and the coaxial cable penetrates through the medium substrate and the second radiation paster to connect with the first radiation paster. According to the circular polarization microstrip antenna, the two radiation pasters and near-field coupling between the two radiation pasters are utilized to expand axial ratio bandwidth of the antenna on the condition that antenna profile height does not increase, the circular polarization microstrip antenna in relatively wide frequency band scope can generate a axial ratio curve having three resonance peaks, circular polarized wave turning directions are consistent, compared with an antenna with same profile height, axial ratio bandwidth of the circular polarization microstrip antenna is improved to a wider mode.

The present invention provides a wideband wide beam circularly polarized dielectric resonant antenna and a design method thereof. The antenna comprises a cylindrical microwave dielectric radiation unit, a dual-layer circuit substrate, a microstrip circuit, a coaxial feed and a choke sleeve. The cylindrical microwave dielectric radiation unit is arranged on the upper-layer circuit substrate of thedual-layer circuit substrate, and the dual-layer circuit substrate comprises an upper layer, an intermediate layer and a lower layer. The upper layer is a copper clad floor with an intersected gap, the intermediate layer is a rectangular microstrip, and the lower layer is a circular patch. The upper layer and the lower layer are connected via a metal via hole, the choke sleeve is connected with the lower-layer circular patch, and the coaxial feed penetrates the choke sleeve and is connected with the rectangular microstrip via the metal via hole. The antenna enables the bandwidth and the beam width to be increased, at the same time, has a lower structure complexity.

The invention discloses a broadband circularly polarized microstrip antenna array and relates to the technical field of antennae. The broadband circularly polarized microstrip antenna array comprises a plurality of antenna units, a main feed unit, a feed unit 1, a feed unit 2, a feed unit 3, a dielectric substrate and a stratum II, wherein the antenna units include an antenna unit 1, an antenna unit 2, an antenna 3 and an antenna unit 4 which are all the same and are same in interval; the adjacent antenna units are rotated for 90 degrees in sequence in direction; feed signal amplitudes of the antenna units are the same, and phase differences of the antenna units are 0 degree, -90 degrees, -180 degrees and -270 degrees in sequence; the main feed unit is connected with the feed unit 1, the feed unit 2 and the feed unit 3 of branches; the feed unit 1, the feed unit 2 and the feed unit 3 are connected with the antenna unit 1, the antenna unit 2 and the antenna unit 3 in sequence; and the main feed unit is connected with the antenna unit 4.

The invention relates to a broadband and high low-elevation gain first-generation beidou satellite navigation transceiver antenna, which comprises two layers of dielectric plates, two coupling round copper sheets and four grounding rectangular copper sheets, wherein an antenna radiation patch is arranged on the lower surface of the upper layer of dielectric plate; a grounding plate is arranged on the upper surface of the lower layer of dielectric plate; a feed network is arranged on the lower surface of the lower layer of dielectric plate; the upper layer of dielectric plate and the lower layer of dielectric plate are fixed through plastic screws; an air layer with a certain length is arranged between the upper layer of dielectric plate and the lower layer of dielectric plate; the coupling round copper sheets are arranged in the air layer and are parallel to the dielectric plates; a feed point is arranged at the circle center of each coupling round copper sheet; the feed points are connected with the feed network through feed probes; the four grounding rectangular copper sheets are respectively attached to the periphery of the antenna; and one side of each grounding rectangular copper sheet is connected with the grounding plate. The broadband and high low-elevation gain first-generation beidou satellite navigation transceiver antenna has the advantages of low profile, large bandwidth, wide wave beam and low cost on the basis of dual-frequency characteristics and can be well applied to beidou navigation terminal equipment.

The invention belongs to the field of satellite communication and provides a double-frequency broadband circular polarization grating based on single-layer dielectric; on the premise that a low-profile single-layer dielectric structure is guaranteed, the problem that an existing double-frequency circular polarization grating is high in insertion loss and narrow in bandwidth is solved. According tothe unit structure of the circular polarization grating, a horizontal I-shaped dipole and a half I-shaped dipole of the cross-shaped structure provide low-frequency resonance and high-frequency respectively; and the size of the horizontal I-shaped dipole and the size of the half I-shaped dipole are adjusted, so as to realize the adjustment of the circularly polarized grating low-frequency pass band and the high-frequency pass band and the double-frequency iso-circularly polarized emergent wave; and in addition, a vertical I-shaped dipole of the cross-shaped structure further optimizes the working frequency band, so that the insertion loss at the two central frequency points of 18.55 GHz and 28.54 GHz are only 1.1dB and 0.8dB respectively, the axial ratio bandwidths can reach 24% and 11% respectively, and the K / Ka satellite communication working frequency bands can be completely covered.

The invention relates to the technical field of an antenna and particularly relates to a micro antenna for 5G mobile communication. The micro antenna comprises a metal reflection plate, a dielectric substrate, a metal square cut angle radiant patch, a metal rectangular radiation patch, a first metallized through hole, a first metal disc, a flanged fixed connector, a second metalized through hole and a short-circuit metal column, wherein the flanged fixed connector is coupled with the first metal disc through the first metallized through hole for feeding, and the short-circuit metal column penetrates through the second metalized through hole. The micro antenna is advantaged in that a coupling feeding mode is employed, the excellent impedance characteristic of the antenna is realized, the antenna standing-wave ratio is improved, work band width of the antenna is enhanced, the structure is simple and compact, the profile is low, and the antenna is easy to process.

The invention discloses a Ka-band compact high-efficiency broadband dual circularly polarized antenna, which comprises a metal waveguide wall, a left-hand circularly polarized input port, a right-hand circularly polarized input port, a left-hand gradually-changing step matching waveguide cavity, a right-hand gradually-changing step matching waveguide cavity, a multi-metal boss gradually-changing coupling network, a vertical polarization transmission waveguide cavity, a horizontal polarization forming waveguide cavity and circularly polarized wave radiation ports are arranged in the metal waveguide wall. The left-hand circularly polarized input port is connected with the multi-metal boss gradual change coupling network through the left-hand gradually-changing step matching waveguide cavity; the right-handed circularly polarized input port is connected with the multi-metal boss gradual change coupling network through the right-handed gradually-changing step matching waveguide cavity. The multi-metal boss gradually-changing coupling network is connected with the two circularly polarized wave radiation ports through the vertical polarization transmission waveguide cavity and the horizontal polarization transmission waveguide cavity. The antenna is formed by all-metal integrated processing, is compact and stable in structure, is high in radiation efficiency, and meets the working requirements of light weight, low cost, high gain and broadband.

The invention discloses a dual-frequency dual-circularly-polarized common-aperture antenna for satellite communication. The dual-frequency dual-circularly-polarized common-aperture antenna comprises a first dielectric substrate, a second dielectric substrate and a third dielectric substrate which are sequentially stacked from bottom to top; the bottom surface of the first dielectric substrate is provided with a feed network structure, and the top surface is provided with a metal ground; a low-frequency radiation unit is arranged on the top surface of the second dielectric substrate; a high-frequency radiation unit is arranged on the top surface of the third dielectric substrate; the feed network structure comprises a low-frequency port feed network structure and a high-frequency port feed network structure, and band-pass filtering structures are arranged in the feed network structures respectively; and the high-frequency and low-frequency port feed network structures are connected with the high-frequency and low-frequency radiation units through the slot coupling structures respectively. According to the invention, the high port isolation is realized by introducing the band-pass filtering structure, the feed network structure is connected with the radiation unit through the slot coupling structure, and impedance and axial ratio bandwidth are improved by introducing the slot coupling structure; the high-frequency and low-frequency radiation units are designed in a layered manner, so that the overall size of the antenna is reduced; the overall design is simple and the weight is light.

The invention discloses a broadband low-profile high-isolation dual-circular polarization two-dimensional wide-angle scanning sparse array, and belongs to the technical field of microwave antennas. The sparse array is composed of periodically arranged dual-port antenna units, and activated antenna unit ports at different scanning angles are optimized through a genetic algorithm, so that the gain of a main wave beam of the sparse array during working is reduced by less than or equal to 0.5 dB compared with the gain of a main wave beam during full array. An SIW back cavity type structure is adopted in the antenna unit, a three-section coupling line directional coupler is adopted at the same time, and a second section of coupling line gap is a sawtooth-shaped gap. According to the dual-circular polarization sparse array, dual-circular polarization two-dimensional wide-angle scanning can be achieved, and the purpose of achieving the effect close to a full array can be achieved through a small number of T / R assemblies.