127 results about "Axial ratio bandwidth" patented technology

The invention discloses a broadband high-efficiency 1bit circularly polarized reconfigurable transmission unit and an array antenna. The reconfigurable transmission unit comprises a circularly polarized wave receiving patch, an upper-layer dielectric substrate, an upper-layer metal ground plane, a middle dielectric substrate, a DC bias line, a lower-layer metal ground plane, a lower-layer dielectric substrate and a radiation patch which are sequentially arranged from top to bottom, and can directly realize two unit phases of 0 degree and 180 degrees of circularly polarized transmission waves; the equivalent rotation phase is free of dispersion; the state of each unit in the transmission array is controlled through the FPGA, + / -60-degree large-angle scanning of circular polarization transmission beams can be achieved, the beam performance is good, and high circular polarization purity is achieved. The array antenna provided by the invention has the advantages of wide axial ratio bandwidth and high aperture efficiency, and has relatively high application potential and value in scenes requiring real-time electric control circular polarization beam scanning antennas, such as application of long-distance radar detection, communication systems and the like.

The invention relates to a circularly polarized quasi-absorption filtering phased-array antenna. A unit of the antenna comprises a multi-layer dielectric substrate, a semi-cured layer, a metal floor, a stacked patch and an orthogonal H-shaped gap, the first dielectric substrate is provided with a parasitic square loop, the second dielectric substrate is provided with a cross-shaped strip, and radiation zero points are introduced to the upper and lower edges of a passband respectively; the 3dB orthogonal directional coupler and the L-shaped feeder form a feed network, circularly polarized radiation is realized through slot coupling, and an isolation port of the 3dB orthogonal directional coupler is connected with a 50-ohm resistor, so that the energy of a lower stop band is absorbed, the energy of an upper stop band is reflected, and a quasi-absorption filtering characteristic is presented; the antenna is compact in structure and easy to process, has wide axial ratio bandwidth and good filtering performance, and when array scanning is 0-45 degrees, the overlapping impedance bandwidth is 12%, the axial ratio bandwidth is 15.8%, and the maximum scanning loss is 2.3 dB; the antenna is compact in structure and easy to process, has wide axial ratio bandwidth and good quasi-absorption filtering performance, and has huge potential in millimeter wave satellite communication application.

The invention discloses a circularly polarized dielectric resonator two-dimensional beam scanning phased-array antenna based on liquid crystal, and belongs to the technical field of microwave antennas. The antenna comprises an elliptic cylindrical dielectric resonator radiation structure, a sequential rotation feed network and a liquid crystal phase shifter structure based on a glass plate, wherein the elliptic cylindrical dielectric resonator radiation structure and the sequential rotation feed network are arranged on a flexible printed circuit board (FPC); the radiation structure and the feed network which are arranged on the FPC comprise a radiation unit, an FPC layer and a feed network; the liquid crystal phase shifter comprises a glass dielectric substrate, a liquid crystal layer, an inverted spiral microstrip line and a bias network; the elliptic cylindrical dielectric resonator radiation structure realizes wide impedance bandwidth and wide axial ratio bandwidth; the antenna array also uses a sequential rotation method, the axial ratio characteristic of the phased-array antenna is further improved, and the coupling feed structure is simplified by using the design that the L-shaped microstrip line is connected with the inverted spiral microstrip line after sequential rotation.

The invention discloses an ultra-low profile broadband circularly polarized microstrip patch antenna array and a design method thereof, the antenna array is constructed on a single-layer thin dielectric substrate, and an antenna unit is formed by combining a substrate integrated waveguide resonant cavity and a microstrip patch resonator embedded in the center of the substrate integrated waveguide resonant cavity. On the premise that the antenna size is not increased, the combination of the double resonators is realized. The adjacent antenna units are arranged at zero intervals and share the metal columns surrounding the edge of the substrate integrated waveguide resonant cavity. Two pairs of polarization orthogonal degenerate modes with similar resonance characteristics are introduced by utilizing a central gap, an annular gap and four symmetrical gaps connected with the central gap and the annular gap, so that four resonance points with similar radiation characteristics and similar resonance frequencies and two axial ratio zero points are formed, and synchronous broadening of impedance bandwidth and axial ratio bandwidth is realized. In addition, a radiation zero point is generated at the position close to the upper edge of the passband along the radiation counteracting effect on the two sides of the annular gap, and therefore the out-of-band rejection performance of the antenna is improved.

The invention discloses an ultra-wideband compact circularly polarized antenna based on a miniaturized phase shifter, and belongs to the technical field of antenna engineering. According to the antenna, the feed network and the Vivaldi antenna are cascaded, so that the antenna has the characteristic of wide bandwidth; the broadband matching characteristic is realized by designing a metal coupling sheet, a zigzag structure, an inverted L-shaped balun and the like; a novel miniaturized ultra-wideband 90-degree phase shifter is designed by adopting an n network and a negative group delay circuit; and the Vivaldi antenna layer and the feed network layer both adopt a PCB (Printed Circuit Board) technology, so that the processing is easy, and the cost is low. Compared with a traditional phase shifter, the size of the phase shifter is reduced by 75%, and the size of the phase shifter is 67 mm * 44.5 mm (0.071 lambda 1 * 0.047 lambda 1). Meanwhile, a simulation result shows that the provided circularly polarized antenna has a 10dB impedance bandwidth of 0.32 to 1.2 GHz (3.75: 1) and a 3dB axial ratio bandwidth of 0.32 to 1.15 GHz (3.59: 1).

The invention discloses a low-profile and high-integration broadband dual-circularly-polarized transceiving common-aperture phased-array antenna, which adopts a multi-layer PCB (Printed Circuit Board) laminated structure, comprises a radiation patch layer, a quasi-rectangular patch layer, a metal reflection ground layer and a feed layer from top to bottom, and is combined with a metalized blind hole and a buried hole to form a complete coupling path. A U-shaped groove, a U-shaped metal strip and a C-shaped groove are integrated on a metal reflection ground, and a staggered groove is loaded on a quasi-rectangular patch, so that a K / Ka dual-band separated dual-coupled feed structure is realized, and dual circularly polarized radiation is obtained under the same aperture. The antenna is further provided with outer ring and inner ring plated-through hole arrays, the outer ring plated-through hole arrays are used for constructing an isolation area to improve the isolation degree between wavebands, and the inner ring plated-through hole arrays introduce a horizontal electric field component to improve the circular polarization purity and expand the axial ratio bandwidth. Wide impedance bandwidth and wide axial ratio bandwidth are realized in the K wave band and the Ka wave band, the isolation degree is high, the profile is low, the structure is compact, and the broadband phased array antenna is suitable for broadband phased array systems such as satellite communication terminals and mobile platforms.

The invention discloses a terahertz wave band circularly polarized antenna based on sequential rotation feeding, and belongs to the field of radio frequency front-end devices. The circularly polarized antenna is composed of four microstrip patches, chamfers located on a radiation patch, a microstrip line, a microstrip line feed port, a sequential rotation feed network, a dielectric substrate, a metal ground backboard and a microstrip line matching structure. A 90-degree phase difference is generated by strictly designing the electrical length from each port to the feed network to realize circular polarization performance, right-handed circularly polarized waves are radiated, the radiation gain is 10.47 dB, the 3dB axial ratio bandwidth is greater than 8GHZ, the 3dB axial ratio range exceeds 90 degrees, and the complete half-power beam width is covered. The antenna adopts the microstrip line for feeding, the loss of the microstrip line is small, the microwave transmission characteristic is good, and the antenna radiation efficiency is high. The antenna adopts a single-layer board design, has no complex feed network, and is simple in structure and convenient to manufacture.

The invention discloses a broadband circularly polarized magnetoelectric dipole antenna with superposed Ka-band radiation modes, and belongs to the field of radio frequency front-end devices. The antenna is composed of an electric dipole patch composed of a rectangular patch and a stepped patch, a magnetic dipole radiator composed of four metal columns, an H-shaped slotted coupling floor, a feeder line, coaxial feed metal columns, an SIW structure, a metal ground backboard, an upper dielectric substrate, a lower dielectric substrate and a pp bonding layer, an antenna unit is subjected to 4 * 4 arraying, and the circularly polarized radiation performance of the antenna unit is verified. According to the invention, the circularly polarized wave beam range is wide, and the axial ratio bandwidth is 3GHz to cover the complete working frequency band. After the array is formed, the active S parameters of the array elements are well matched, and the excellent axial ratio performance is still achieved during beam scanning.

The invention discloses a circularly polarized array antenna and electronic equipment. The circularly polarized array antenna comprises a feed network layer, a signal radiation layer and a reflection metal layer. The feed network layer is used for generating a radiation signal based on an input signal. The signal radiation layer is connected with the feed network layer, and the signal radiation layer is used for transmitting radiation signals. The reflection metal layer is arranged between the feed network layer and the signal radiation layer, and the reflection metal layer is used for reflecting radiation signals radiated towards the feed network layer. The feed network layer and the signal radiation layer are separated and located in different layers through the reflection metal layer, the axial ratio bandwidth and the circular polarization gain of the circular polarization array antenna can be improved under the condition that the thickness of the circular polarization array antenna is reduced, the impedance bandwidth is improved, and the antenna performance is improved. The problem that miniaturization low profile, broadband and high gain of the existing circularly polarized array antenna cannot be considered at the same time is solved.

The invention, which relates to the technical field of modern communication, discloses a metasurface-based high-gain low-profile dual-circularly polarized antenna comprising a first dielectric plate, a second dielectric plate arranged below the first dielectric plate, and a metasurface structure arranged above the first dielectric plate. Three rows and three columns of periodically arranged metasurface structures are arranged above the first dielectric plate, a multi-level cooperative working mechanism is constructed by combining 45-degree symmetrical composite gaps etched in a layer indirect floor and a microstrip feeder line which is orthogonally arranged on the lower layer, and the metasurface array realizes high-gain radiation by regulating and controlling the phase of electromagnetic waves. The composite slot structure efficiently converts microstrip line energy into an orthogonal degenerate mode through non-contact coupling, circular polarization purity is guaranteed, the axial ratio bandwidth is expanded to 24.2%, an orthogonal microstrip feeder line forms a 90-degree phase difference through accurately controlled size, high isolation and stable standing-wave ratio of double ports are guaranteed, and the antenna has a wide application prospect. And finally, dual-circular-polarization independent radiation is realized in a 5mm low-profile structure.

The invention relates to the technical field of microwaves and antennas, particularly discloses a miniature ultra-wideband planar helical antenna based on a magnetic medium, and aims to solve the problem that indexes such as miniaturization, ultra-wideband, high gain and circular polarization are difficult to consider in the design of an existing helical antenna. The helical antenna structure comprises an antenna radiation unit, a metal stepped shielding inner cavity, a Balun feed structure, a feed connector, a circular metal reflection back cavity and a magnetic dielectric material. According to the invention, the magnetic dielectric material is arranged below the radiation circuit so as to regulate and control the surface current distribution at the tail end of the circuit and centrally regulate and control the size and direction of an electromagnetic field vector in a cavity, so that the reduction of the transverse and longitudinal dimensions of the antenna is effectively realized; the impedance matching bandwidth and the axial ratio bandwidth of the miniaturized antenna can be improved while the high gain of the antenna is kept, the extremely high impedance matching bandwidth can be realized, and the excellent circular polarization characteristic is kept in the bandwidth range.

The invention discloses a method for improving bandwidth and efficiency of a 1bit circular polarization transmission array antenna, which comprises the following steps of: rotating a radiation patch of a 1bit circular polarization phase coding transmission unit by 90 degrees to form a first-class unit which is orthogonally placed with a radiation layer of an original transmission unit; the original transmission units and the orthogonal units are arranged in a crossed and staggered manner to form 2 * 2 structural blocks; exchanging the positions of the original units and the orthogonal units in the 2 * 2 structural blocks to form 2 * 2 replacement structural blocks; the original structural blocks and the replacement structural blocks are arranged in a crossed and staggered mode to form 4 * 4 unit supercells; the radiation layer distribution pattern of the 4 * 4 unit supercell is approximately that four 2 * 2 structural blocks rotate in sequence at angles of 0 degree, 90 degrees, 180 degrees and 270 degrees; and constructing a 1bit circular polarization transmission array antenna by 4 * 4 unit supercells. According to the invention, the strong relevance of main polarization and cross polarization phase regulation in a uniform array is relieved, and the axial ratio bandwidth of a circular polarization beam and the aperture efficiency of an array antenna are improved.

The invention discloses a double-broadband linear polarization-to-circular polarization electromagnetic surface, and relates to the technical field of wireless communication. The linear polarization-to-circular polarization electromagnetic surface comprises three layers of dielectric substrates, and an air gap or a foam layer is filled between the adjacent dielectric substrates. Forward patch metal units and backward patch metal units are periodically printed on the front and back surfaces of each layer of dielectric substrate; the forward patch metal unit is composed of four fan-shaped patches in mirror symmetry and two rectangular strips, and the backward patch metal unit only comprises a metal strip penetrating through the whole unit. According to the invention, the axial ratio bandwidth optimization of the low-frequency band and the high-frequency band can be realized by adjusting the unit size, the gap of the dielectric substrate, the width of the metal strip, the fan-shaped patch and the size of the coupling gap. The dual-broadband linear polarization-to-circular polarization electromagnetic surface provided by the invention can cover a K / Ka satellite communication frequency band, has the characteristic of low insertion loss, and can be applied to common-caliber dual-circular polarization high-throughput satellite communication.

The invention relates to a millimeter wave broadband low-profile circularly polarized patch antenna, and belongs to the technical field of communication. The antenna comprises a radiation layer, a single-layer dielectric substrate and a metal ground, the radiation layer is laid on the top layer of the dielectric substrate, and the metal ground is laid on the bottom layer of the dielectric substrate; the radiation layer comprises a phase shifter and a parasitic patch; the phase shifter is used for realizing circular polarization radiation; the parasitic patches are arranged on the periphery of the phase shifter and used for improving the working bandwidth and the axial ratio bandwidth. According to the antenna, the structure simplification and low cost are realized through a planar structure, and the working bandwidth and the axial ratio bandwidth of the circular polarization patch are improved through reasonably arranging the parasitic patch.

The invention belongs to the technical field of antennas, and provides a broadband circularly polarized millimeter wave magnetoelectric dipole antenna which comprises an excitation port, a microstrip feeder line, a 0.127 mm thick dielectric plate, a bonding layer, a metal floor, a grounding copper column, a 1.575 mm thick dielectric plate, a radiation patch and a parasitic patch. According to the millimeter wave circularly polarized antenna disclosed by the invention, the circular arc-shaped patch and the rectangular patch are effectively overlapped, and the axial ratio bandwidths of the two antennas are combined, so that a new radiation patch is formed, the broadband is realized, the axial ratio of the designed antenna unit is increased from 29.72 GHz-33.19 GHz to 27.95 GHz-43.33 GHz on the premise that the existing radiation performance is not influenced, and the antenna unit has a wide application prospect. The frequency band range of the antenna impedance matching lower than-10dB is 23.8-61.6 GHz, and the impedance matching relative bandwidth reaches 88.5%; the range of the frequency band with the axial ratio lower than 3dB is 27.95-43.33 GHz, and the relative bandwidth of the axial ratio reaches 43.1%; the frequency band range of the 3dB gain is 25.09-42.09 GHz, the relative bandwidth of the 3dB gain reaches 50.6%, the maximum gain 9.6 dBic is achieved at the 34GHz, the performance is excellent in all aspects, and the requirement of a broadband wireless communication system can be met.

The invention provides a wide-axial-ratio circularly polarized antenna based on a four-feed annular dipole, and relates to the technical field of antennas. Comprising a bottom dielectric plate, and a feed network is printed on the upper surface of the bottom dielectric plate; the isolation plate is positioned above the bottom dielectric plate; the top dielectric plate is located above the isolation plate, and a coaxial cable is arranged between the top dielectric plate and the isolation plate; a radiation patch is printed on the lower surface of the top dielectric plate, four metal patches are printed on the upper surface of the top dielectric plate, and the radiation patch is formed by surrounding four fan-shaped patches; the metal sheet covers the central position above the top dielectric plate; the metal ring is arranged outside the bottom dielectric plate and the top dielectric plate in a covering mode, the isolation plate, the coaxial cable, the radiation patch, the metal patch and the feed network are wrapped in the metal ring, and the technical problems that in the prior art, the axial ratio bandwidth of an antenna is narrow, and the 3dB axial ratio beam width is not large enough are solved.

The invention provides a broadband circularly polarized antenna array of a millimeter wave Ka band, and belongs to the field of antennae, the broadband circularly polarized antenna array comprises a first dielectric substrate, a second dielectric substrate, a third dielectric substrate and a fourth dielectric substrate which are stacked from bottom to top, an SIW cavity structure is arranged in the first dielectric substrate, a first gap is formed in a metal ground on the upper surface of the first dielectric substrate, and a second gap is formed in a metal ground on the upper surface of the fourth dielectric substrate. A cross-shaped SIW feed structure is arranged in the second dielectric substrate, a second gap located above the first gap is formed in the metal ground on the lower surface of the second dielectric substrate, a third gap is formed in the metal ground on the upper surface of the second dielectric substrate, a plurality of antenna units are arranged on the upper surface of the fourth dielectric substrate, each antenna unit comprises two semicircular patches, and the two semicircular patches are arranged in parallel. A suspension column is arranged in a gap between the two semicircular patches, a parasitic dipole is arranged outwards from the outer side of the suspension column, and the parasitic dipole comprises a rectangular patch and a spiral arm patch clockwise connected to one end of the rectangular patch; the radiation efficiency of the antenna in the millimeter wave band is improved, and the axial ratio bandwidth completely covers the Ka band.

The invention provides a filtering circularly polarized antenna with a wide axial ratio bandwidth. The filtering circularly polarized antenna comprises a first dielectric plate, a second dielectric plate, a third dielectric plate and a fourth dielectric plate which are sequentially arranged in parallel from bottom to top, a metal reflecting plate is printed on the lower surface of the first dielectric plate; a feed network is printed on the lower surface of the second dielectric plate, a slotted metal ground is printed on the upper surface of the second dielectric plate, a feed port is formed in one side edge of the second dielectric plate, and the feed port is electrically connected with the feed network and the slotted metal ground; a second square patch and an octagonal parasitic microstrip line frame are printed on the upper surface of the third dielectric plate, and the octagonal parasitic microstrip line frame surrounds the outer side of the second square patch; and a first square patch is printed on the lower surface of the fourth dielectric plate. Through an interlayer coupling collaborative design, 2.3-5.0 GHz broadband circular polarization radiation and high gain characteristics are realized, and the antenna also has high out-of-band rejection capability and can effectively filter out-of-band clutter interference.

The invention provides an antenna unit and an antenna array, belongs to the technical field of antennas, and aims to broaden the impedance bandwidth and the axial ratio bandwidth of the antenna unit, the antenna unit comprises: a feed structure comprising a metal element for feeding; the radiation structure is coupled with the feed structure and comprises a radiation patch, and the radiation patch comprises a target point; wherein the radiation patch comprises at least one circle of slit pattern surrounding the target point, the slit pattern comprises a plurality of slits, and the plurality of slits are arranged at intervals along the perimeter direction of the radiation patch; wherein in the normal direction of the radiation patch, the distance between the metal element and the radiation patch is larger than 0 mm and smaller than or equal to 0.01 mm.

This invention discloses a broadband circularly polarized integrated feed transmission array antenna covering the entire Ka-band, comprising an array surface and an integrated feed. The phase center of the integrated feed coincides with the focal point of the array surface, illuminating the array surface perpendicularly and forming a 45-degree angle with the array surface in the horizontal direction. The array surface comprises multiple array elements of different sizes arranged linearly. Each array element includes two orthogonally arranged first and second dielectric substrates, which have the same height but different thicknesses. The integrated feed comprises a stacked first and second PCB board. A substrate integrated waveguide is disposed on the first PCB board with coupling slots, and a substrate integrated waveguide cavity and annular metal patches surrounding the substrate integrated waveguide cavity are disposed on the second PCB board. This invention achieves a wide axial ratio bandwidth and gain bandwidth, and has the advantages of low profile, light weight, easy fabrication, and low cost.

The application discloses a circularly polarized logarithmic-periodic antenna based on rotation of radiating oscillators, and belongs to the technical field of antenna engineering, and aims at solving the problem of how to design a circularly polarized logarithmic-periodic antenna with wide bandwidth, low profile and simple structure. The application forms corresponding circularly polarized characteristics by rotating a plurality of groups of radiating oscillators by a certain angle with parallel assembly lines as the shaft. The antenna only has a plurality of radiating oscillators which change according to the logarithmic-periodic antenna rule, and does not have a main oscillator and a sub-oscillator, so that the structure is simpler and easier to realize. Meanwhile, the circularly polarized effect is formed by rotating the radiating oscillators to a certain phase and the phase difference between the electromagnetic waves of each oscillator and the zero point of the antenna, so that the logarithmic-periodic antenna can obtain good impedance bandwidth and 3dB axial ratio bandwidth in the working frequency band.

A single-feed broadband circularly polarized patch antenna for navigation provided by the present invention comprises a first dielectric plate, a second dielectric plate, a third dielectric plate, a metal shielding box and a coaxial cable; an antenna radiator is printed on the first dielectric plate, a coplanar waveguide structure is printed on the second dielectric plate, and a feeding structure is printed on the third dielectric plate; the coaxial cable feeds power to the coplanar waveguide structure on the second dielectric plate through the feeding structure on the third dielectric plate; and the coplanar waveguide structure on the second dielectric plate couples and feeds power to the antenna radiator on the first dielectric plate. The present invention combines a coplanar waveguide structure with a patch antenna, and through a coplanar waveguide coupling feeding technique, successfully improves the axial ratio bandwidth of the single-feed circularly polarized antenna, doubles the maximum operating bandwidth of the single-feed circularly polarized antenna, solves the problem that it is difficult to apply the single-feed circularly polarized antenna with a narrow bandwidth to satellite navigation, and has extremely high applicability and flexibility in the satellite navigation applications of multiple systems and multiple frequency bands.

The invention relates to the technical field of antennas, in particular to a circular polarization patch antenna with a wide axial ratio bandwidth. The antenna comprises a patch, a grounding plate, parasitic units and a reactance load structure, the grounding plate is located at the lowest layer of the whole antenna, the patch and the parasitic units are arranged above the grounding plate at intervals, the parasitic units are arranged near the patch, coupling gaps are arranged between the parasitic units and the patch at intervals, and the reactance load structure is connected to the parasitic units. The reactance load structure adopts one or more combinations of the following structural forms: a capacitive element combined connection conductor, an extension branch knot and a short circuit column. According to the circularly polarized patch antenna with the wide axial ratio bandwidth, the parasitic unit regulated and controlled by the load is arranged beside the main radiation patch, so that the problems of narrow axial ratio bandwidth, complicated structure or high cost of a circularly polarized antenna in the prior art are effectively solved.

The application discloses a kind of super surface circularly polarized antennas, belong to wireless communication technical field, including: super surface, super surface includes a plurality of first super surface units and a plurality of second super surface units arranged in array, first super surface unit is located in the periphery of second super surface unit, and second super surface unit is the symmetrical structure formed by cutting first super surface unit;Dielectric substrate, dielectric substrate includes upper layer dielectric substrate and lower layer dielectric substrate;Driving patch, driving patch is located between upper layer dielectric substrate and lower layer dielectric substrate;Metal floor, metal bottom plate is arranged on the lower surface of lower layer dielectric substrate;Microstrip feed structure, through coupling gap and driving patch non-contact coupling;By unit array optimization, phase difference is generated in orthogonal radiation mode, and circularly polarized radiation is realized.50 ohm microstrip line feeding is used, and non-contact coupling excitation is realized by coupling gap and driving patch;Synergistic design realizes 31.5% impedance bandwidth, 20.4% axial ratio bandwidth, and full coverage WBAN5.15-5.825GHz frequency band.

The present invention discloses a ultra-wideband compact circularly polarized antenna based on a miniaturized phase shifter, belonging to the technical field of antenna engineering. The antenna of the present invention adopts the form of cascading a feeding network and a Vivaldi antenna, and has the characteristic of wide bandwidth; the broadband matching characteristic is realized by designing forms such as a metal coupling sheet, a serrated structure, and a Γ-shaped balun; a novel miniaturized ultra-wideband 90-degree phase shifter is designed by adopting a Π network and a negative group delay circuit; both the Vivaldi antenna layer and the feeding network layer adopt the PCB process, which is easy to process and has low cost. Compared with the traditional phase shifter, a 75% size reduction is achieved, and its size is 67mm * 44.5mm (0.071λ l * 0.047λ l ). At the same time, the simulation results show that the proposed circularly polarized antenna has a 10 dB impedance bandwidth of 0.32 - 1.2 GHz (3.75:1) and a 3 dB axial ratio bandwidth of 0.32 - 1.15 GHz (3.59:1).

This invention relates to the field of phased array antenna technology, specifically disclosing a low-profile broadband circularly polarized phased array antenna element, antenna array, and fabrication method. The antenna includes a body and interconnected feed layers disposed at the bottom of the body. The body comprises, from top to bottom, a parasitic patch, a first dielectric layer, a radiating patch, and a second dielectric layer. A metallized via, coaxial with the body and interconnected with the radiating patch, is disposed on the second dielectric layer. The feed layer is interconnected with the metallized via. A U-shaped slot is disposed on the radiating patch. The metallized via is located within the U-shaped region formed by the U-shaped slot. Compared with the traditional eccentric feeding method, this invention reduces the antenna profile height, lowers fabrication costs, broadens the impedance bandwidth and axial ratio bandwidth, and optimizes the antenna's axial ratio performance.

This invention discloses a dual-substrate circularly polarized reconfigurable omnidirectional antenna based on PIN diode control. The antenna comprises a first substrate and a second substrate. The second substrate has a ground plane printed on it, and the first substrate has a radiating patch printed on it. The radiating patch includes a central square patch, a Γ-shaped stub, a loop antenna, PIN diodes, and via shorting posts. Seamless switching between left-hand and right-hand circular polarization is achieved through the on / off combinations of 16 PIN diodes, with a simple switching logic. High polarization purity is achieved in both polarization modes, and the via shorting posts effectively reduce mutual interference between modes, resulting in strong switching reliability. In both circular polarization modes, the relative impedance bandwidth and axial ratio bandwidth are wide. In the left-hand circular polarization mode, the relative impedance bandwidth reaches 19.38%, covering 2.33-2.83GHz with |S11|<-10dB, and the axial ratio bandwidth reaches 26.3%, covering 2.08-2.71GHz with AR<3dB. In the right-hand circular polarization mode, the relative impedance bandwidth reaches 19.8%, covering 2.32-2.83GHz with |S11|<-10dB, and the axial ratio bandwidth reaches 23.43%, covering 2.11-2.67GHz with AR<3dB, which is significantly better than existing narrowband designs of the same type.

The invention provides a broadband wide-axial-ratio circularly polarized antenna based on a tight coupling principle, and relates to the technical field of microstrip antenna structure design, the broadband wide-axial-ratio circularly polarized antenna comprises a first dielectric plate as a substrate, and a feed network capable of realizing one-to-four power division and 90-degree phase shift is printed on the lower bottom surface of the first dielectric plate; a second dielectric plate is arranged above the first dielectric plate in parallel, four arc-shaped metal patches are arranged on the lower bottom surface of the second dielectric plate to form a radiation unit, and the adjacent patches are tightly coupled through an interdigital capacitor; and a strip-shaped microstrip line is arranged on the upper top surface of the second dielectric plate. And the four coaxial feeder lines are vertically connected with the output end of the feed network and each metal patch, so that high-efficiency transmission of signals is realized. The upper surface of the first dielectric plate is provided with an annular metal cavity which is connected with the metal ground and is used for improving the axial ratio at a low elevation angle. According to the invention, wide impedance bandwidth and wide axial ratio bandwidth are realized, and the antenna has wide axial ratio beam width and high radiation efficiency.

The utility model discloses a dual-frequency circularly polarized combined antenna, which comprises a metal reflecting plate, a high-frequency circularly polarized radiation unit and a low-frequency wide-beam radiation unit, the high-frequency circularly polarized radiation unit and the low-frequency wide-beam radiation unit share the same reflecting plate, and the high-frequency circularly polarized radiation unit is positioned above the low-frequency wide-beam radiation unit. According to the utility model, the embedded orthogonal dipole pair is adopted, so that the high-frequency-band axial ratio bandwidth breaks through the limitation of the traditional single-feed microstrip antenna, the relative bandwidth with the actually measured axial ratio less than or equal to 3dB reaches 18.7%, and the Beidou third-generation B1C / B2a frequency band requirement can be completely covered. The nickel-chromium alloy films evaporated on the upper and lower surfaces of the dielectric plate effectively inhibit interlayer crosstalk, the cross polarization ratio is improved to be greater than 15dB, and the dual-band radiation purity is ensured.

The present invention discloses a broadband circularly polarized patch antenna with a compact size, comprising: a dielectric substrate; a driven patch, a first coupling patch and a second coupling patch. All three patches are right-angled triangles, and the three are adjacent and arranged at intervals on the dielectric substrate. The driven patch and the first coupling patch are electromagnetically coupled to form a circular polarization axial ratio zero point, and the first coupling patch and the second coupling patch are electromagnetically coupled to form another circular polarization axial ratio zero point. Three rows of metallized vias are formed on the dielectric substrate, and the three rows of metallized vias are respectively electrically connected to the driven patch, the first coupling patch and the second coupling patch; a ground plane, and the ground plane is arranged on the second surface of the dielectric substrate. The technical solution of the present invention can meet the requirements of a compact structure and a large bandwidth for a circularly polarized antenna. Under the same dielectric profile, the circular polarization axial ratio bandwidth is doubled compared with that of a chamfered patch.