43 results about "Axial ratio bandwidth" patented technology

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 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.

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.

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.

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 invention relates to the technical field of antennas, in particular to a miniaturized low-profile circularly polarized microstrip antenna with double axial ratio points. A circular radiation patch unit is adopted, and the circular radiation patch unit comprises a cross dipole, a rectangular feed strip, a fan-shaped NFRP unit and an L-shaped NFRP radiation unit. The cross dipole patch is symmetrical along the X axis on the whole and is formed by crossing a pair of printed dipoles of which the tail ends are of fan-shaped structures, metal short circuit columns are loaded at the tail ends of the fan-shaped structures so as to realize the miniaturization of the antenna size, the coaxial feed structure feeds a rectangular strip extending from the cross dipoles in the + X axis direction, and the Left-hand polarization (LHCP) of the antenna is realized. The NFRP patch comprises a fan-shaped NFRP patch and two L-shaped NFRP patches, the fan-shaped NFRP patch is embedded in the-X axis direction of the crossed dipole, and a new resonance mode is introduced for the antenna so as to generate a second axial ratio point; the two L-shaped NFRP patches are respectively embedded in the-Y-axis direction and the + Y-axis direction of the crossed dipole and are used for reducing the frequency division ratio of two axial ratio points, and at the moment, the axial ratio bandwidth of the original crossed dipole circularly polarized antenna is effectively expanded.

The invention discloses a millimeter wave dual-circular polarization multi-beam antenna based on a polarization grating lens. The millimeter wave dual-circular polarization multi-beam antenna comprises a dielectric polarization grating lens and a millimeter wave + / -45-degree dual-linear polarization antenna array. According to the multi-beam antenna, a + / -45-degree dual-line polarization planar antenna array is used as a feed source and is placed on a horizontal focal plane of a dielectric polarization grating lens, and dual-circular polarization beam scanning is realized by exciting different ports of the feed source array. Each perforated column in each layer of the dielectric polarization grating lens has dielectric constants in radial gradient distribution and anisotropy in horizontal and vertical directions, and can convert + / -45-degree dual-linear polarization into dual-circular polarization while converting spherical waves into plane waves to improve antenna gain. The planar lens and the polarization grid structure are integrated, the system size is effectively reduced, + / -50-degree dual circular polarization beam scanning is achieved, the axial ratio bandwidth reaches 21.8% (24.5-30.5 GHz), and the maximum gain reaches 19.2 dBic.

The invention relates to the technical field of wireless, and provides a cavity-backed circularly polarized antenna. The cavity-backed circularly polarized antenna comprises a resonant cavity, the top layer of the resonant cavity is etched with a radiation structure, and the radiation structure is used for generating an inherent circularly polarized resonance point; at least one resonant structure is arranged in the resonant cavity, the at least one resonant structure is used for generating an additional circularly polarized resonant point, and the at least one resonant structure is electromagnetically coupled with the radiation structure, so that the inherent circularly polarized resonant point and the additional circularly polarized resonant point interact to widen the circularly polarized bandwidth. According to the invention, the axial ratio bandwidth is effectively expanded so as to meet the requirements of a modern broadband communication system.

The antenna is of a layered structure and comprises a first dielectric substrate and a second dielectric substrate which are arranged in parallel, an air layer is arranged between the first dielectric substrate and the second dielectric substrate, a rectangular parasitic metal patch is arranged on the upper surface of the first dielectric substrate, and the rectangular parasitic metal patch is arranged on the lower surface of the second dielectric substrate. Each rectangular parasitic metal patch is connected with a continuously bent metal stub line; a rectangular driving metal patch is arranged on the upper surface of the second dielectric substrate, and a metal ground is arranged on the lower surface of the second dielectric substrate. The wide axial ratio bandwidth and circular polarization self-decoupling of the laminated microstrip patch antenna can be realized without an additional decoupling structure or circuit, and the antenna has the characteristics of simple structure, wide axial ratio bandwidth, self-decoupling, multi-antenna expansion, easy integration and the like, and is suitable for satellite communication, global positioning system, mobile communication and the like.

The application discloses a heart-shaped broadband circularly polarized patch antenna, which comprises a dielectric substrate, a heart-shaped radiation patch, a microstrip feed line and a ground plate. A characteristic mode analysis method suitable for irregular geometric shapes is proposed, that is, a plurality of non-orthogonal characteristic modes are used to realize a broadband circularly polarized antenna. The application has the advantages of simple structure, beauty, compactness, simple feed mode, wide impedance and axial ratio bandwidth, and stable radiation pattern. The new method has clear physical mechanism, simple steps and wide application prospect.

The invention discloses a low-profile broadband circularly polarized array antenna based on traveling wave slot coupling feeding. The array adopts a multi-layer structure and comprises a feed microstrip line layer, a first dielectric substrate, a metal plate with a cross recess, second to fifth dielectric substrate layers, a first metal sheet layer and a second metal sheet layer from top to bottom. The feed network realizes energy equal-amplitude in-phase and unequal-phase transmission through the first-stage T-shaped microstrip line and the second-stage unequal-length T-shaped microstrip line. The cross recess on the metal plate and the metalized through hole in the dielectric substrate work cooperatively to guide electromagnetic waves to radiate upwards and suppress transverse loss. The multiple layers of dielectric plates and the metal sheets are mixed and stacked and are arranged in a sequential rotation mode, so that the impedance bandwidth and the axial ratio bandwidth are effectively widened, and the antenna gain is improved. The antenna realizes the characteristics of high gain, wide bandwidth and low profile of 0.056 working wavelength under the center frequency of 7GHz.

The invention discloses an S-band dual-polarization high-temperature-resistant high-gain flatness circularly polarized antenna, and belongs to the technical field of communication. The antenna comprises an all-metal radiator, a metal floor and an antenna housing, the all-metal radiator comprises a circular metal radiation patch with an arc-shaped gap, a metal column and a cross-shaped metal radiation patch; dual-polarization directional circularly-polarized radiation is realized by coaxially feeding power to the circular metal radiation patch under the antenna on the + X axis and the + Y axis, the hexagonal metal columns are used for improving the working frequency band of the whole antenna and providing good mechanical stability, and the topmost cross-shaped metal radiation patch is used for improving the final gain, the working bandwidth and the axial ratio bandwidth. The metal floor is added to the outer layer of the antenna, the antenna housing is added to the upper portion of the radiator, the working performance of the whole antenna is protected, an all-metal structure is adopted, high temperature stability and high gain are ensured, the gain flatness is 0.5 dB, the working frequency band is 2.09 GHz-2. 58 GHz, the axial ratio bandwidth is 2.09 GHz-2. 5 GHz, the profile height is 0.25, and the center frequency wavelength is achieved.

This invention discloses a broadband circularly polarized millimeter-wave antenna. It uses a magnetoelectric dipole antenna as a linearly polarized antenna source, satisfying the characteristics of wide impedance bandwidth and stable gain. A polarizer is then used to increase the gain while simultaneously achieving circular polarization. This design eliminates the need for a complex feed network, reducing design complexity, improving efficiency, and providing a wide axial ratio bandwidth. The invention includes a polarizer 1 and a magnetoelectric dipole antenna 2. The polarizer 1 consists of multiple polarization layers, each composed of spaced-apart grating media 11 and air plates 12. Adjacent polarization layers satisfy the following conditions: the grating media 11 and air plates 12 are cuboid structures; the length of the grating media 11 is less than the length of the air plate 12; the upper right corner of the lower grating media 11 is connected to the upper left corner of the upper grating media 11; along the height direction of the grating media 11, the magnetoelectric dipole antenna 2 is separated from the polarizer 1 by a distance g, and is supplied to the antenna sequentially through a rectangular waveguide-to-SIW structure 3 and a flange.

The invention relates to the technical field of antennas, in particular to a broadband circularly polarized antenna based on a metasurface and dielectric resonant cavity dual multiplexing technology. The antenna comprises a dielectric substrate, a dielectric resonator and a metasurface, the metasurface comprises a plurality of asymmetrical metasurface units distributed in a matrix mode, each asymmetrical metasurface unit comprises a circular ring metasurface part and an asymmetrical cross metasurface part, and each asymmetrical cross metasurface part comprises a first strip-shaped part and a second strip-shaped part. The width of the first strip-shaped part is smaller than that of the second strip-shaped part, the two ends of the first strip-shaped part penetrate through the circular ring metasurface part, and the length of the second strip-shaped part is smaller than the diameter of the inner side of the circular ring metasurface part. According to the broadband circularly polarized antenna based on the metasurface and dielectric resonant cavity dual-multiplexing technology, the axial ratio bandwidth performance of the antenna is further improved through the metasurface and dielectric resonant cavity dual-multiplexing technology and introduction of the asymmetric cross-shaped metasurface part to the circular ring metasurface part, and the actual application requirement of the antenna is met.

The invention discloses a broadband circularly polarized dielectric resonator antenna with double-sided beam broadening. The antenna is sequentially provided with a first dielectric block, a first metal layer, a second dielectric block, a metal ground layer, a dielectric substrate and a second metal layer from top to bottom, the first dielectric block is rectangular, the second dielectric block is in a centrosymmetric cross shape, the first metal layer comprises four centrosymmetric rectangular metal patches and a pair of 45-degree oblique symmetric metal strips, a fork-shaped feed groove is etched in the metal ground layer, and the second metal layer is of a linear microstrip feed structure. A signal is coupled to the fork-shaped feed groove through the microstrip feed structure, the laminated dielectric block is excited to generate an orthogonal mode to form right-handed circular polarization, the rectangular metal patch realizes beam broadening, and the metal strip inhibits left-handed circular polarization to broaden the axial ratio bandwidth. The antenna is wide in bandwidth, can achieve double-sided beam broadening, facilitates array scanning, and is suitable for the fields of satellite communication and the like.

This invention discloses a sequentially rotating broadband high-gain circularly polarized antenna, a conformal antenna, and their design methods. The antenna comprises two stacked dielectric substrates, with a radiating structure disposed on the upper surface of the upper substrate. The radiating structure includes a circularly polarized core unit and parasitic patches arranged around it. Connecting patches within the core unit introduce a 90° phase difference between two adjacent sides of the closed-loop patch, exciting circularly polarized radiation and establishing a sequentially rotating phase difference coupling field on the periphery. The parasitic patches obtain coupled feeding through the coupling field to broaden the bandwidth and improve gain. Coupling patches are arranged oppositely between the upper and lower substrates to improve impedance matching. When using a flexible substrate, the antenna maintains broadband circular polarization characteristics and a stable radiation pattern even when bent. This invention achieves an impedance bandwidth of 5.1–7.29 GHz, an axial ratio bandwidth of 5.28–6.77 GHz, a peak gain of 12.14 dB, and cross-polarization below -15 dB, making it suitable for 5G / 6G communication and satellite communication systems.

The application discloses a kind of wideband circularly polarized patch antennas based on non-uniform super surface, including two layers of dielectric substrate, a layer of air layer, three layers of metal layer.From top to bottom, it is first layer metal, first layer dielectric substrate, air layer, second layer metal, second layer dielectric substrate and third layer metal.The first layer metal layer is 4x4 non-uniform super surface unit array;Second layer metal layer is the truncated square patch connected with an L-shaped branch and an extended trapezoidal strip;Third layer metal layer is the metal ground plane consistent with the size of dielectric substrate.The application generates additional high-frequency resonance points and axial ratio minimum points by loading L-shaped branch on truncated square patch and designing non-uniform super surface, thereby realizing relatively wide impedance bandwidth and axial ratio bandwidth, and explaining the circularly polarized radiation mechanism of the antenna and the principle of forming wideband through characteristic mode analysis.

The utility model provides a circularly polarized antenna, and the antenna employs a single-layer dielectric substrate which is provided with a square groove. A feed port is arranged in the square groove; the feed port is electrically connected with the T-shaped branch knot; the dielectric substrate comprises two rectangular branches extending towards the square groove, and the two rectangular branches are arranged on the two sides of the square groove in a staggered mode. In the first direction, the two rectangular branches are arranged above the T-shaped branch; the first direction is parallel to the direction from the vertical end to the transverse end of the T-shaped branch knot; the two rectangular branches are related to the axial ratio bandwidth and the wave beam. In conclusion, by means of the simple branch knot structure, accurate control over the axial ratio bandwidth and the wave beam is achieved, then the requirement of a current small relay can be met, and the actual requirement can be met.

The invention discloses a metasurface circularly polarized antenna, which belongs to the technical field of wireless communication, and comprises a metasurface, the metasurface comprises a plurality of first metasurface units and a plurality of second metasurface units which are arranged in an array, and the first metasurface units are located on the peripheries of the second metasurface units; the second metasurface unit is of a symmetrical structure formed by cutting the first metasurface unit; the dielectric substrate comprises an upper-layer dielectric substrate and a lower-layer dielectric substrate; the driving patch is positioned between the upper-layer dielectric substrate and the lower-layer dielectric substrate; the metal bottom plate is arranged on the lower surface of the lower-layer dielectric substrate; the microstrip feed structure is in non-contact coupling with the driving patch through the coupling gap; through unit array optimization, a phase difference is generated in an orthogonal radiation mode, and circular polarization radiation is realized. A 50-ohm microstrip line is adopted for feeding, and non-contact coupling excitation is carried out through a coupling gap and a driving patch; by means of collaborative design, 31.5% of impedance bandwidth and 20.4% of axial ratio bandwidth are achieved, and the full coverage of the WBAN5.15-5.825 GHz frequency band is achieved.

The invention discloses a broadband high-gain low-radar cross section (RCS) circularly polarized array antenna based on sequential rotation of stacked magnetic dipoles, which is suitable for an X-band radar system and can be widely applied to scenes with strict requirements on antenna bandwidth, gain and low radar cross section, such as meteorological detection, ship navigation, short-range air defense and the like. According to the antenna, through stacking of the magnetic dipoles, sequential rotation of the rectangular grooves and the special-shaped metal sheets, mirror symmetry structure design and feed system phase control, the characteristics of wide frequency band coverage, high gain radiation and low radar cross section are achieved at the same time, and the technical contradiction that a traditional circular polarization array antenna is difficult to consider wide bandwidth, high gain and low radar cross section (RCS) at the same time is solved. The antenna works under the conditions that the center frequency is 9.23 GHz, the relative impedance bandwidth reaches 36%, the 3dB axial ratio bandwidth is 28%, the peak gain is 11.35 dBi, and linear polarization and circular polarization RCS reduction of the relative bandwidth of 80% can be achieved.

The invention discloses a compact broadband microwave circular polarization-millimeter wave MIMO common-aperture antenna structure, and relates to the field of microwave communication design, and an upper layer rectangular patch of the antenna is provided with a first rectangular groove and a second rectangular groove; the cross dipole radiator is composed of a rectangular patch with a cross recess and a phase delay line, the phase delay line provides a 90-degree phase difference to form circular polarization radiation, and a pair of rectangular millimeter wave slot rectangular patches and a pair of millimeter wave slot rectangular patches with chamfers are asymmetric to cause a coupling function. And the impedance bandwidth and the axial ratio bandwidth of the microwave circularly polarized antenna are expanded. The microwave antenna and the millimeter wave antenna are integrated on the single-layer substrate, the structure is simple, the cost is low, the performance is excellent, high isolation between the two frequency bands is achieved through the closed substrate integrated waveguide, and the millimeter wave antenna can promote the performance of the microwave antenna.

The invention discloses a circularly polarized backscattering antenna for broadband energy transmission and narrowband signal transmission. The circularly polarized backscattering antenna comprises a reflecting plate, a dielectric substrate, a plurality of rectangular dipoles, a plurality of L-shaped parasitic units, a plurality of pairs of rectangular parasitic units, a quarter-wavelength feed arc and a coaxial line connector, the first rectangular dipole, the second rectangular dipole, the third rectangular dipole and the fourth rectangular dipole are arranged on the upper layer and the lower layer of the dielectric substrate respectively to form a crossed dipole structure, and the L-shaped parasitic unit and the rectangular parasitic unit are symmetrically distributed along the axis where the extending directions of the first rectangular dipole and the second rectangular dipole are located. The second rectangular dipole and the fourth rectangular dipole respectively feed through an inner conductor and an outer conductor of the coaxial line connector, and are respectively connected with the first rectangular dipole and the third rectangular dipole through a quarter-wavelength feed arc; and the reflecting plate outputs forward radiation reflected waves. According to the invention, the radiation performance of high gain, wide axial ratio bandwidth and impedance bandwidth is obtained, the selection capability of receiving in-band specific-frequency circularly polarized signals is realized, and meanwhile, the antenna has more excellent signal reflection capability.

The invention belongs to the technical field of electrical elements, and particularly relates to a millimeter wave broadband circularly polarized magnetoelectric dipole antenna and array loaded with parasitic patches. A pair of E-shaped electric dipole structures is arranged on the top surface of an upper-layer substrate; the E-shaped electric dipole structure comprises a transversely arranged E-shaped patch and a transverse branch knot connected with the side edge of the E-shaped patch; the two E-shaped patches are arranged in a staggered mode, and the transverse branch knot of one E-shaped patch corresponds to the notch of the other E-shaped patch. A C-shaped parasitic patch corresponding to the E-shaped patch is arranged on the bottom surface of the upper substrate layer; and the projection of the n-shaped parasitic patches half surrounds the projection of the middle vertical edge of the corresponding E-shaped patch, so that circularly polarized radiation is realized by reconstructing the E-shaped electric dipole structure, regulating and controlling the surface current distribution of the E-shaped electric dipole structure, and on the basis, a new axial ratio point is introduced by loading a pair of n-shaped parasitic patches and utilizing electromagnetic coupling between the n-shaped parasitic patches and the main radiating body, so that the radiation efficiency is improved. And the axial ratio bandwidth of the antenna is effectively expanded.

The application belongs to the technical field of antennas and discloses a double circular polarization leaky-wave antenna based on a substrate integrated waveguide, which comprises a feeding structure and a radiating structure; the feeding structure is symmetrically arranged at two ends of the radiating structure, and both the feeding structure and the radiating structure are substrate integrated waveguides; the feeding structure is used for converting received external electromagnetic energy into guided electromagnetic waves and has the characteristic of widening impedance; wherein a gradually changing coplanar waveguide transmission line is designed in the feeding structure; the radiating structure is used for converting the guided electromagnetic waves transmitted by the feeding structure into circular polarization electromagnetic waves in free space; wherein a grid window leaky-wave structure is designed in the radiating structure; by combining the leaky-wave antenna and the substrate integrated waveguide technology, the gradually changing coplanar waveguide transmission line is designed on the feeding structure, the grid window leaky-wave structure is designed along the radiating structure, the millimeter wave working frequency band requirement is realized, and the characteristics of wide axial ratio bandwidth, low sidelobe, large scanning range, low profile and low cost are achieved.