120 results about "Circularly polarized radiation" patented technology

The present disclosure discloses a circularly polarized satellite antenna based on a magnetoelectric dipole. A floor is slotted, and an equivalent magnetoelectric dipole is excited using a grounded right-angle folded dipole, while two square parasitic patches are loaded to enhance a radiation performance, thus exciting a broadband high-gain circularly polarized radiation beam. The present disclosure utilizes the L-shaped right-angle folded dipole to simultaneously realize an ingenious combination of an electric dipole and a magnetic dipole, realizing a good circularly polarized radiation performance. At the same time, the present disclosure realizes circularly polarized radiation using a form of the magnetic dipole, which results in a stable pattern and a high gain.

The invention discloses a millimeter wave broadband dual circularly polarized antenna and an array. The millimeter wave broadband dual circularly polarized antenna comprises two layers of microwave medium substrates, a bonding medium, a grounding metal plate and a coaxial feed probe. Two E-shaped patch antennas, four small square patches and an L-shaped metal strip are printed on the upper surface of the upper-layer dielectric substrate, gaps are obliquely formed in the centers of the small square patches, the L-shaped metal strip is used for increasing port isolation, and the E-shaped patches excite the four small square patches to achieve the broadband radiation characteristic. And two coaxial feed probes are respectively connected with two output ends with 90-degree phase difference of the 3dB directional coupler on the lower surface of the lower-layer microwave dielectric substrate, sequentially penetrate through the lower-layer microwave dielectric substrate, the bonding medium, the grounding metal plate and the upper-layer microwave dielectric substrate, and are electrically connected with the two E-shaped patch antennas, so that circularly polarized radiation is realized. According to the invention, the circularly polarized antenna with wide beam width, wide impedance bandwidth, wide axial ratio bandwidth and dual polarization characteristics is realized, and the circularly polarized antenna is suitable for potential application requirements of millimeter wave frequency band wireless communication and satellite communication.

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 broadband circular polarization metasurface antenna with a low radar cross section. The broadband circular polarization metasurface antenna is composed of a top layer 4 * 4 antenna array, a middle layer metal ground, a bottom layer one-to-sixteen sequential rotation feed network and two dielectric plates among the three layers. The antenna array is composed of four subarrays which are arranged in a 2 * 2 period, and the four groups of subarrays are symmetrical up and down and left and right along the center of the antenna array and are arranged in a chessboard shape. Each antenna unit in the antenna array comprises a bow-tie-shaped metal patch, and the patch is connected with the output end of the feed network at the bottom layer through a first metalized through hole; the feed network is composed of three one-to-two second-order Wilkinson power dividers, four 90-degree phase shifters, twelve T-shaped power dividers and a plurality of sections of 50-ohm microstrip lines. Through fusion design of the antenna and the metasurface, the problem that in the design process of the metasurface antenna with the low radar cross section, the antenna aperture is increased due to the fact that the antenna and the metasurface are independently designed firstly and then integrated is solved, and the low radar cross section characteristic of the broadband and the high-performance circular polarization radiation characteristic are achieved.

The invention belongs to the field of satellite mobile communication, and particularly provides a three-frequency-band circularly polarized flexible microstrip antenna and wearable equipment, used radiation patches are superconducting fabrics, a dielectric substrate is made of flexible felt materials and has the overall flexibility characteristic, so that the wearing comfort is ensured, the mode that two layers of radiation patches are stacked is adopted, and the antenna is more flexible. The upper-layer patch is subjected to special treatment such as branch knot loading and slotting to obtain a dual-band right-handed circularly polarized radiation characteristic, the parasitic patch is introduced to the upper surface of the upper-layer dielectric substrate to enhance the axial ratio bandwidth of the upper-layer patch, and the lower-layer patch is subjected to corner cutting treatment to obtain a left-handed circularly polarized radiation characteristic. And the isolation degree between the two ports is enhanced by introducing the metal short-circuit through hole. And the upper-layer patch and the lower-layer patch are fed by using a coaxial cable. Finally, the section of the antenna is only 0.05 lambda0, and the antenna is simple in structure, convenient to manufacture, good in performance and more convenient to wear on a human body, and meets the performance requirements of a Beidou navigation system.

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 low-profile bidirectional end-fire circularly polarized antenna array and an adjusting method thereof, the antenna array comprises eight sub-arrays, a single-layer F4B dielectric substrate and a one-to-sixteen radio frequency circuit, the eight sub-arrays are divided into four left sub-arrays and four right sub-arrays, and the four left sub-arrays and the four right sub-arrays are arranged on the single-layer F4B dielectric substrate in a central symmetry mode; each sub-array comprises a feed metal column, a short-circuit metal column, a magnetic dipole and an electric dipole, and the adjustment method comprises the steps of introducing polarization constraint conditions, constructing a model, constraining an electric field component in a bidirectional end-fire direction, forming a circularly polarized wave, and accurately adjusting the excitation of each antenna array element according to optimal excitation distribution. The problem of polarization mismatch when a receiving terminal moves among circularly polarized waves in different rotation directions is solved, bidirectional left-hand circularly polarized radiation is flexibly realized, the defect of low end-fire circularly polarized gain of a traditional single electromagnetic dipole is overcome, and bidirectional end-fire gain exceeds 11.5 dBic.

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 discloses a double-frequency omnidirectional circularly polarized antenna with single-port feed. The double-frequency omnidirectional circularly polarized antenna comprises a + 45-degree first dielectric substrate and a-45-degree second dielectric substrate, wherein the + 45-degree first dielectric substrate and the-45-degree second dielectric substrate are vertically intersected. Two concentric zero-phase-shift magnetic rings are printed on the upper surface of the + 45-degree first dielectric substrate, the outer ring is a zero-phase-shift low-frequency magnetic ring, the inner ring is a zero-phase-shift high-frequency magnetic ring, and two arms of a double-frequency dipole are printed on the upper surface and the lower surface of the-45-degree second dielectric substrate respectively. The double-frequency dipole is composed of a first low-frequency dipole and a first high-frequency dipole which are connected through a metal column. A signal enters from a port, and simultaneously excites the first low-frequency dipole arm, the first high-frequency dipole arm, the zero-phase-shift low-frequency magnetic ring and the high-frequency magnetic ring in the same phase through two microstrip feeder lines printed on the upper surface and the lower surface of the-45-degree second dielectric substrate, so that dual-frequency circularly polarized radiation is realized. And the designed low-frequency magnetic ring and the designed high-frequency magnetic ring can realize good omnidirectional radiation of the antenna. The antenna works at two frequency bands of 2.45 GHz and 5.8 GHz, and good omnidirectional circularly polarized radiation is realized.

The invention discloses a compact circularly polarized filtering patch antenna which comprises an upper dielectric substrate and a lower dielectric substrate, a positive 45-degree main radiation patch, a pair of inclined rectangular parasitic patches which are arranged in a positive 45-degree direction and are parallel to the main radiation patch, and a pair of L-shaped parasitic patches which are arranged in a diagonal line in the positive 45-degree direction are printed on the upper dielectric substrate; a pair of vertical rectangular parasitic patches which are arranged diagonally at minus 45 degrees are printed on the lower surface of the upper-layer dielectric substrate; a floor is printed on the upper surface of the lower dielectric substrate, a middle rectangular groove is etched in the middle lower portion of the floor, four edge rectangular grooves are etched in the edge of the floor, a microstrip feeder line and a branch knot are printed on the lower dielectric substrate, and signals enter from a port and are coupled to the main radiation patch through the middle rectangular groove in the floor via the microstrip feeder line. And the main radiation patch is coupled and excited to the peripheral parasitic patches. By using the compact circularly polarized filtering patch antenna provided by the invention, the circularly polarized radiation performance with a compact structure and good band-pass filtering response is realized.

The invention discloses a low-profile broadband circularly polarized antenna for an ultra-wideband positioning system. The low-profile broadband circularly polarized antenna comprises a first dielectric substrate, a grounding plate and a second dielectric substrate, the first dielectric substrate, the grounding plate and the second dielectric substrate are sequentially attached from top to bottom; a plurality of circular metal patches are arranged on the upper surface of the first dielectric substrate to form a metasurface structure; a Z-shaped gap is etched in the grounding plate; the lower surface of the second dielectric substrate is provided with a microstrip feed structure, and the microstrip feed structure comprises a microstrip line, a feed branch with a gradual change structure, and an SMA connector. One end of the microstrip line is connected with the feed branch with the gradual change structure, and the other end is connected with the SMA connector. The circular metal patch is adopted to form the metasurface structure, the rectangular gaps of different sizes are etched in the center of the circular metal patch, the feed branch knot with the gradual change structure is coupled with the Z-shaped gap to excite the metasurface structure to generate circular polarization radiation, and large circular polarization bandwidth and impedance bandwidth are achieved.

The invention discloses a broadband circularly polarized radiator antenna based on slot gap waveguide, and relates to the technical field of waveguide slot antennae, the broadband circularly polarized radiator antenna based on slot gap waveguide is provided with a circularly polarized radiation slot structure, a slot gap waveguide transmission structure and a microstrip feed structure from top to bottom in sequence; the microstrip feed structure comprises a dielectric substrate and a radio frequency SMA connector, wherein the back surface of the dielectric substrate is coated with copper, and the front surface of the dielectric substrate is etched with a microstrip patch. The slot gap waveguide transmission structure adopts an all-metal slot gap waveguide structure, comprises periodically arranged metal pins and stepped metal ridges, and is used for transmitting electromagnetic waves; the circularly polarized radiation slot structure comprises dumbbell-shaped slots, orthogonal radiation slots and metal fins, and is used for realizing broadband circularly polarized wave radiation. The microstrip patch excitation is adopted to facilitate active high integration, and the broadband circular polarization performance, the out-of-band filtering characteristic and the good heat dissipation characteristic are achieved through the slot gap waveguide transmission structure design and the orthogonal radiation slot design.

The invention belongs to the field of antennas, and particularly relates to a polarization selection electromagnetic protection circularly polarized antenna and a use method thereof. The polarization selection electromagnetic protection circularly polarized antenna comprises an antenna radiation unit which comprises a main radiation body and a plurality of current coupling perturbation structures arranged on the main radiation body; the polarization control and protection unit comprises at least two groups of protection structures and control elements corresponding to the protection structures; the two groups of protection structures are respectively arranged corresponding to two orthogonal polarization directions of the antenna and are selectively connected with the main radiator through the control element; the multi-feed network comprises a plurality of feeds which are connected according to a preset phase difference relation and is used for exciting the antenna radiation unit to generate circularly polarized radiation waves; according to the circularly polarized antenna provided by the invention, the connection state of a protection structure is switched through a passive control element under high-power microwave incidence, and the polarization characteristic of the antenna is dynamically reconstructed, so that polarization selective protection is realized and the communication capability is kept under strong electromagnetic attack.

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 circularly polarized metasurface antenna comprises a metasurface layer, a first dielectric plate layer, a metal floor layer, a second dielectric plate layer and a feed network layer which are sequentially stacked from top to bottom, the metasurface layer comprises a plurality of mutually orthogonal metasurface subunits, each metasurface subunit comprises a plurality of metasurface structures arranged in an array period, and each metasurface structure is provided with a monopole radiation structure; the feed network layer is provided with a plurality of output feed points, and the number of the output feed points is the same as that of the metasurface structures. The output feeding points are connected with probes, and the probes sequentially penetrate through the second dielectric plate layer, the metal floor layer and the first dielectric plate layer until the probes are connected with the input feeding points of the corresponding radiation structures. According to the antenna, each layer adopts a covering laminated design, the structure is compact, the antenna has the characteristics of ultra-wideband circular polarization radiation, high gain and good cross polarization, the dual ultra-wideband characteristics of working and RCS reduction are realized, the RCS reduction bandwidth completely covers the working bandwidth, and effective invisibility in and out of the antenna band is achieved.

The invention discloses a circularly polarized positioning antenna and wearable equipment. The circularly polarized positioning antenna comprises a first annular radiator working at a first frequency band; the coupling connection with the first annular radiator is a first branch knot, and the first branch knot is used for accessing a first feed signal to excite the first annular radiator to work in a first radiation mode; the second branch knot is in coupling connection with the first annular radiator, a preset distance is formed between the second branch knot and the first branch knot, the second branch knot is used for being grounded or used for being connected with a second feed signal, and the two radiation modes have the same amplitude and the 90-degree phase difference, that is, the annular radiator generates right-handed circularly polarized radiation. Therefore, the positioning antenna can better receive the navigation satellite signal, and the right-handed circularly polarized radiation generated by the annular radiator can also filter the left-handed circularly polarized navigation satellite signal reflected by the high-rise building or the ground to reduce multipath interference, thereby effectively improving the positioning precision of the positioning antenna of the wearable device.

The invention discloses a Ka-band low-cost dual-circularly-polarized wide-angle scanning microstrip array antenna, and belongs to the field of mechanical auxiliary scanning antenna arrays. The antenna comprises a lower-layer metal plate, a dielectric layer and an upper-layer metal plate, wherein the lower-layer metal plate is provided with a feed network, the dielectric layer comprises a dielectric disc located in the middle and two dielectric substrate slab waveguides symmetrically arranged on the left side and the right side of the dielectric disc, and the dielectric disc is used for achieving dual-circular polarization radiation and can rotate to achieve mechanical auxiliary scanning; and the upper metal plate is used for fixing the dielectric layer and is provided with a circular through hole for placing and shielding the radiation opening surface. The antenna solves the problems that polarization of a traditional VICTS antenna design is linear polarization, the influence of multipath interference is large, satellite communication is not facilitated, beam coverage of a traditional Pillbox antenna design is limited, and the scanning angle is large, and has the advantages of being wide in beam scanning range, circular in polarization, low in profile and low in cost.

The application provides a circularly polarized conformal antenna for a curved carrier. 11 The antenna comprises a full-metal floor, a ring-shaped patch, a feed patch and four parasitic patches. The ring-shaped patch resonates in a TM The sequential 90° phase difference provided by the arc-shaped strips can realize circularly polarized radiation. Four parasitic patches surrounding the ring-shaped patch are introduced to excite another circularly polarized resonant mode, thereby widening the bandwidth and improving the gain. In order to verify the conformal performance of the antenna, the performances under different bending radii are compared and discussed. Finally, the final profile of the antenna of the application is 0.054λ0, λ0 is the free space wavelength of the antenna at the center frequency, and the antenna has the characteristics of low profile, wide bandwidth and high gain.

The application discloses a single-port-fed dual-frequency omnidirectional circularly polarized antenna, which comprises two vertically intersecting +45-degree first dielectric substrates and -45-degree second dielectric substrates. The upper surface of the +45-degree first dielectric substrate is printed with two concentric zero-phase-shift magnetic rings, wherein the outer ring is a zero-phase-shift low-frequency magnetic ring, and the inner ring is a zero-phase-shift high-frequency magnetic ring; the upper and lower surfaces of the -45-degree second dielectric substrate are respectively printed with two arms of a dual-frequency dipole, the dual-frequency dipole is composed of a first low-frequency dipole and a first high-frequency dipole and is connected through a metal column. Signals enter from a port, and the first low-frequency dipole arm, the first high-frequency dipole arm and the zero-phase-shift low-frequency magnetic ring and the high-frequency magnetic ring are simultaneously and in-phase excited through two microstrip feed lines printed on the upper and lower surfaces of the -45-degree second dielectric substrate, so that dual-frequency circularly polarized radiation is realized. The designed low-frequency magnetic ring and the high-frequency magnetic ring can realize good omnidirectional radiation of the antenna. The antenna works at two frequency bands of 2.45 GHz and 5.8 GHz, and good omnidirectional circularly polarized radiation is realized.

This invention discloses a gapped waveguide circularly polarized antenna for vehicle-mounted millimeter-wave radar, relating to the field of antenna technology. The antenna includes an upper metal structure and a PCB substrate stacked below. The metal structure integrates a radiating layer, a slotted layer, and a resonant cavity layer enclosed by an electromagnetic bandgap structure and metal walls. The signal is fed in through the PCB chip port, via an E-plane waveguide and an E-H waveguide conversion structure, and then into the resonant cavity. This invention, by employing a longitudinally slotted stacked -45° tilted slot radiating element design, or in conjunction with a parasitic slot structure, can equally excite two orthogonal fundamental modes and control the phase difference, thereby achieving broadband circularly polarized radiation. This antenna adopts a single-layer metal integrated design, featuring low profile, high gain, and wide axial ratio bandwidth, and is easy to fabricate and integrate. It is particularly suitable for high-performance vehicle-mounted MIMO radar systems, effectively solving the problems of high high-frequency dielectric loss and complex circular polarization implementation in existing technologies.

The invention discloses a method and device for generating on-axis higher harmonics of circularly polarized radiation based on an undulator, and belongs to the field of synchrotron radiation and undulators. The method comprises the steps of 1, arranging a plurality of electromagnetic coils between a magnetic block of the circular polarization undulator and an electron beam vacuum tube, and 2, when the circular polarization undulator works, introducing currents with the same magnitude into all the electromagnetic coils, and enabling the polarities of the currents in the transversely adjacent electromagnetic coils to be different, a periodic additional magnetic field is generated on a central shaft of the circular polarization undulator through the electromagnetic effect of each electromagnetic coil, and higher harmonic radiation can be received on the shaft. According to the undulator, the flux of the obtainable circularly polarized radiation higher harmonics can be greatly enhanced on a shaft, and the higher harmonics of a certain specific order can be enhanced in a targeted manner, so that the coverage range of circularly polarized radiation photon energy of the undulator is greatly expanded under the condition that subsequent beam line transformation is not carried out, and the undulator has a wide application prospect. And the user experiment efficiency and the overall performance of the device are improved.

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 application provides a circularly polarized array antenna, which comprises a first metal layer, a first substrate, a second metal layer, a second substrate, a third metal layer, a third substrate and a fourth metal layer which are sequentially stacked, the first metal layer is provided with a plurality of arrayed radiation patches for realizing circularly polarized radiation characteristics, a plurality of coupling slots are formed in the second substrate and penetrate the second metal layer and the third metal layer, the inner wall of the coupling slot is metallized and is in conduction with the second metal layer and the third metal layer, the coupling slot is arranged in one-to-one correspondence with the radiation patch, the third substrate is provided with a first resonant cavity which is in communication with the coupling slot, the inner wall of the first resonant cavity is metallized, and the fourth metal layer is provided with a first feeding port which is in communication with the first resonant cavity. The circularly polarized array antenna provided by the application can greatly reduce the dielectric loss caused by the medium, thereby improving the efficiency and gain of the antenna. High-order mode resonance is also realized, so that more radiation patches can be designed in a limited size, and the design of an array antenna with a larger number of antenna units is met.

This invention relates to the field of antenna technology, and particularly to a miniaturized circularly polarized antenna with a wide axial ratio and wide beamwidth. The antenna includes a dielectric substrate, a circular radiating patch unit, metal shorting posts, a coaxial differential feed structure, and a metal ground plane. The circular radiating patch unit consists of a pair of orthogonal fan-shaped cross-printed dipoles. A slot structure is added in the middle along the X-axis to divide the radiator into left and right parts, and three metal shorting posts are added to the end of each fan-shaped cross-printed dipole structure. The feed structure is a differential-feed coaxial cable, with its inner and outer conductors contacting the left and right halves of the circular radiating patch unit, respectively. Simultaneously, due to the slight difference in curvature between the two orthogonal fan-shaped printed dipoles, a phase difference is formed between the pair of orthogonal modes of the circular radiating patch unit, ultimately achieving circularly polarized radiation of the antenna. A metal short-circuit post is applied to the electric field zero of a conventional printed dipole, forming a new half-mode operating mode at low frequencies. Simultaneously, the slot structure improves the impedance characteristics of the half-mode, enabling antenna miniaturization. Due to the radiation contribution of the metal short-circuit post in the horizontal direction, the axial ratio beamwidth of this circularly polarized antenna is significantly extended. This application exhibits excellent forward radiation characteristics, along with miniaturization, a wide axial ratio beamwidth, simple structure, low cost, and ease of fabrication.

This invention discloses a miniaturized filtered circularly polarized microstrip patch antenna, comprising: an upper dielectric substrate and a lower dielectric substrate; a main radiating patch is printed in the middle region of the upper surface of the upper dielectric substrate; a first rectangular slot is provided on the main radiating patch; unequal-length cross-shaped patches and longitudinal rectangular parasitic patches are printed on the lower surface of the upper dielectric substrate; a short-circuit parasitic patch and a longitudinal grounded microstrip feed line are printed on the upper surface of the lower dielectric substrate; a ground plane is printed on the lower surface of the lower dielectric substrate; a second rectangular slot is formed at the upper left corner of the main radiating patch, and a protruding rectangular protrusion is provided at the upper right corner of the main radiating patch. This invention utilizes the advantages of the patch antenna's low profile and small size to achieve miniaturization, can generate three circularly polarized radiation frequencies to achieve broadband circular polarization performance, and can generate two radiation nulls to achieve bandpass filtering response.

The utility model provides a monomer coplanar circularly polarized dual-frequency antenna, which comprises an upper-layer radiation electrode, a dielectric substrate, a lower-layer radiation electrode, a reflecting layer and a feed point needle, and is characterized in that the upper-layer radiation electrode and the lower-layer radiation electrode are respectively mounted on the upper surface and the lower surface of the dielectric substrate; the feed point needle is fixed in the dielectric substrate and is electrically connected with the upper-layer radiation electrode and the lower-layer radiation electrode in an electromagnetic coupling mode, and the upper-layer radiation electrode comprises a first frequency band radiation electrode and a second frequency band radiation electrode which are detachable; a gap of a geometric symmetry structure is arranged between the first frequency band radiation electrode and the second frequency band radiation electrode, and the bottom of the feed point needle is connected with the reflecting layer. The dual-frequency circularly polarized antenna solves the problems of poor circularly polarized radiation performance, low electrical index, low integration level, heavy weight, poor process adaptability, low reliability, limited working temperature and the like of the dual-frequency circularly polarized antenna in the prior art.

The application relates to the technical field of antennas and discloses a spiral circularly polarized satellite communication antenna, an antenna array and a UAV, which comprises a feed medium substrate, a metal ground plate is arranged on the first end face of the feed medium substrate, a dumbbell-shaped slot coupling structure is etched on the metal ground plate, a feed network input piece and a feed network output piece are arranged at intervals on the second end face opposite to the first end face; the feed network output piece is located in the middle part of the feed medium substrate, and the projection of the feed network output piece on the plane of the metal ground plate is perpendicular to the slot coupling structure; and a flexible medium substrate cylinder is vertically connected to the metal ground plate, metal radiation arms are spirally arranged on the outer surface of the flexible medium substrate cylinder, and the metal radiation arms are connected to the opposite two side end parts of the feed network output piece through metal connecting pieces. On the basis of providing stable circularly polarized radiation performance, the antenna structure is miniaturized by effectively simplifying the feed structure.

The application discloses a satellite-borne wide-beam circularly polarized antenna with beam equalization and a satellite, and relates to the technical field of antennas.The antenna comprises a conical horn body, a partition type circular polarizer, a feeding port and an insulating base which are sequentially connected.The conical horn body is a conical structure with an umbrella-shaped metal radiation director, and the asymmetry of the traditional horn antenna directional diagram is effectively solved through multi-mode excitation of the circular polarizer, so that the beam equalization characteristic is realized.The loaded dielectric material is polytetrafluoroethylene, the mouth surface radius of the horn is equivalently reduced through dielectric loading, and the directional diagram beam width is widened.The partition type circular polarizer is adopted to realize good circular polarization effect.Through the joint action of the base and the umbrella-shaped metal radiation director, the interference of the antenna mounting surface on the wide-beam antenna radiation diagram is reduced, the requirement of the antenna on the mounting environment is lowered, the wide-beam circularly polarized radiation and reception of the antenna can be effectively realized, and the antenna has the advantages of wide beam, beam equalization and low axial ratio.

This invention discloses a reflection-free filtered circularly polarized antenna based on an asymmetric feed network, comprising: a power divider section, an asymmetric feed section, and a radiator section; the terminal open-circuit coupled feed line and the terminal short-circuit coupled feed line are orthogonally placed in planar space; simultaneously, the asymmetric feed section generates the broadband 90° phase difference required for circularly polarized radiation. Furthermore, the out-of-band reflected signals of the asymmetric feed section can generate a broadband 180° phase difference between the two paths, and these reflected signals are effectively dissipated by the isolation resistor loaded on the power divider section, thereby achieving broadband reflection-free performance. Subsequently, a triangular element topology is constructed using a stacked patch configuration to achieve good filtering performance. The reflection-free filtered circularly polarized antenna of this invention has a simple structure and advantages such as broadband reflection-free bandwidth and excellent filtering characteristics.

The application discloses a planar dual-circularly polarized antenna based on a quadrature magnetic dipole, and relates to the technical field of dual-circularly polarized antennas. The antenna comprises a first dielectric substrate, a metal ground layer, a second dielectric substrate and a third dielectric substrate which are stacked from top to bottom. The metal ground layer is provided with a first coupling slot and a second coupling slot in the middle. The first dielectric substrate is provided with two first metallized through holes and two second metallized through holes. A first metal strip is connected with the metal ground layer through the two first metallized through holes, and the two first metallized through holes are rotationally symmetrical about the first coupling slot. The position relationship between the second metallized through hole and the second coupling slot is the same as the position relationship between the second metallized through hole and the second coupling slot. The coupling slots and the microstrip feed line are coupled to excite the metallized through holes and the metal strip, and generate right-handed circularly polarized radiation waves or left-handed circularly polarized radiation waves in the direction upwards. The application has the performance advantages of low profile, simple structure and wide axial ratio bandwidth.