55results about How to "Axial Ratio Bandwidth" patented technology

The invention discloses a five-frequency-section user machine antenna being compatible with Beidou and GPS (Global Positioning System) functions to be used for solving the problem that isolation between the multi-frequency-section antenna layers is poor. The five-frequency-section user machine antenna being compatible with the Beidou and GPS functions comprises a Beidou first S-frequency-section patch antenna (2), a L-frequency-section patch antenna (3), a Beidou second B1-frequency-section patch antenna (4), a B3-frequency-section patch antenna (5), a feed network plate (6), a base plate (7) and a feed probe (8); an isolating ring is arranged close to a center of the Beidou second B1-frequency-section patch antenna (4) and the B3-frequency-section patch antenna (5); an input end of the feed network of the L-frequency-section patch antenna (3) is provided with a U-shaped nodule; the four patch antennas (2), (3) and (4) and (5) are sequentially arranged from high to low and top to bottom; the feed network plate (6) is fixed at the lower end of the structure; the upper end and the lower end of the feed probe (8) are respectively connected with a corresponding patch and the feed network. The five-frequency-section user machine antenna is compatible with the Beidou and GPS functions and is applicable to vehicle-mounted and shipborne navigation equipment.

The invention discloses a double-rotating circularly polarized antenna which can meet with the using requirements of broadband miniaturization communication equipment, comprising an upper-layer radiation paster 1, a lower-layer radiation paster 2, a floor 3 with coupling gaps, a feed network 4, a dielectric substrate 5, a medium screw 6 and a base 7, wherein the upper-layer radiation paster 1 adopts medium coupled feeding; the lower-layer radiation paster 2 adopts floor 3 coupled feeding with the coupling gaps; the dielectric substrate 5 is used for supporting the gap between the upper-layer radiation paster 1 and the lower-layer radiation paster 2 as well as the gap between the lower-layer radiation paster 2 and the floor 3; and the feed network 4 is located below the floor 3 and adopts a strip line form. Double-tuning characteristic is formed by medium coupled feeding so as to further broaden the antenna impedance bandwidth and axial ratio bandwidth; and caliber utilization is improved in a limited space. Simultaneously, the bandwidth of the antenna is effectively broadened and the structural size of the antenna is reduced through H-shaped gap medium coupled feeding.

A substrate-integrated waveguide resonant slit array circular polarization antenna relates to a circular polarization antenna used in wireless communication fields such as satellite communication, electronic reconnaissance and countermeasure and radar. The circular polarization antenna comprises a microstrip adapter (2) below the front surface of the antenna, and a directional coupler (3) with an input terminal (31) and an isolation terminal (34) connected with the upper portion of the microstrip adapter (2), wherein the input terminal and the isolation terminal (34) are connected with a straight through terminal (32) and a coupling terminal (33) through a middle coupling segment (35); the middle coupling segment (35) is used for adjusting the power distribution of the straight through terminal (32) and the coupling terminal (33); the upper portions of the straight through terminal (32) and the coupling terminal are respectively connected with two left and right symmetrical power dividers (4) with unequal crossed phases; the eight branches of the power dividers (4) are connected with eight radiation waveguides (5); and a first slit array (61) and a second slit array (62) symmetrical to each other and with orthogonal radiation fields are etched in the top metal layer of each branch waveguide at the top eight radiation waveguides.

The invention discloses a high-gain dual-frequency circularly polarized antenna based on a metasurface. The working frequency bands are a K wave band and a Ka wave band. A metal layer of the antenna comprises a micro-strip ring feeder line, a grounding plane with a cross slot and a metasurface. The micro-strip ring feeder line at the lowest position is coupled with the slotted grounding plane at the middle position. The electromagnetic wave energy is coupled to the metasurface of the uppermost layer and is radiated out. The sequential rotation structure of the micro-strip ring feeder line cangenerate a phase difference of 90 degrees so as to excite circular polarization. According to the feed structure, a wide axial ratio bandwidth can be realized; the metasurface can influence the axialratio bandwidth and gain of high and low frequency bands; the gain of the antenna in two frequency bands is greater than 5dBic; and the single-port feed dual-frequency circularly polarized antenna hasgood radiation characteristics in two frequency band bands, and is compact in structure and easy to process, so that antenna has a good application prospect in a wireless communication system.

The invention discloses a broadband circularly polarized millimeter wave multi-feed multi-beam lens antenna. The antenna comprises a multi-port broadband circularly polarized planar feed antenna array(1) and a planar lens (2); a plane of the multi-port broadband circularly polarized planar feed antenna array (1) and a plane of the planar lens (2) are arranged in parallel; and a signal of the multi-port broadband circularly polarized planar feed antenna array (1) is output or received through the planar lens (2). A plurality of focal points are distributed on the planar lens (2) in a phase-shifting mode, and the planar lens is formed by arranging completely identical anisotropic unit structures (5) in a periodic mode. Each anisotropic unit structure (5) is composed of an upper-layer metalpatch (5a), a middle-layer metal patch (5b) and a lower-layer metal patch (5c). The antenna can realize a multi-feed multi-beam characteristic and has a wide application prospect in the aspects of wireless communication and satellite communication.

The invention belongs to the technical field of antennas, and discloses a broadband wide-angle-axial-ratio circularly-polarized patch antenna. The antenna comprises a radiator and a one-to-four feed network. The radiator is composed of four Y-shaped coupling structures and circular radiation sheets which are printed on a first dielectric plate and have the same specification, a ground printed on asecond dielectric plate, six L-shaped parasitic branches which are uniformly distributed around the ground and have the same specification, and four dielectric cylinders which play a role in supporting. The feed network is composed of a two-stage cascaded Wilkison power divider and a 90-degree phase shifter which are printed on a third dielectric plate. According to the invention, the circular radiation patch is fed in a coupling mode, the network adopts the Wilkison power divider and the 90-degree phase shifter which are printed on the medium and are in a multi-stage cascade mode, and the antenna is easy to process, low in profile, light in weight and wide in working bandwidth and can be applied to a navigation system and the like.

The invention discloses a broadband circular polarization capsule antenna combining a plane and a flexible medium and is a capsule antenna which is applied to the internal of the human body and has a broadband circular polarization characteristic and is arranged inside an endoscope. The broadband circular polarization capsule antenna firstly adopts a single-layer circular Rogers medium substrate which has a diameter the same as that of a capsule and coaxial feeding is performed from a bottom; two metal bands are perpendicular to each other on the upper surface of the substrate, wherein one of the metal bands is connected to the ground through short circuit in a position close to the end of a capsule wall and a non-balance feeding mode is formed with the coaxial feeding; on the basis of that, two metal bands on the upper surface of the substrate extend L-shaped branches to the capsule wall so as to achieve following effects: an antenna radiation caliber of the antenna is enlarged and radiation efficiency is increased. Furthermore, the broadband circular polarization capsule antenna of the invention does not occupy too much space inside the capsule while increasing current paths, can better realize miniaturization, forms two orthogonal modes in a needed frequency band and lays the groundwork for circular polarization performance.

The invention discloses an anti-multipath-interference broadband low-axial-ratio global-navigation-satellite-system (GNSS) antenna comprising four rectangular radiating units, corresponding four triangular matching connection units, four via holes, a microstrip line power divider phase-shift network, a feed via hole, a dielectric substrate, a circular plate type floor, four via hole round units, a feed via hole round unit, and a metal cylinder. The four rectangular radiating units and the four triangular matching connection units form a centric symmetric structure and are arranged right above the dielectric substrate. The four via holes pass through the dielectric substrate to realize communication between the triangular matching connection units and the port of the microstrip line power divider phase-shift network. The microstrip line power divider phase-shift network is arranged at the back of the dielectric substrate. The feed via hole is used for connecting the microstrip line power divider phase-shift network with a conductor arranged inside a coaxial feeder. The circular plate type floor is arranged at the front side of the dielectric substrate and the edge of the circular plate type floor is connected with the metal cylinder. The anti-multipath-interference broadband low-axial-ratio GNSS antenna disclosed by the invention has characteristics of good anti-multipath-interference performance, broadband, low axial ration, wide beam, and small size and the like.

The invention provides a millimeter wave omnidirectional circularly polarized antenna used for 5G communication. The millimeter wave omnidirectional circularly polarized antenna comprises a first dielectric plate and a second dielectric plate which are stacked up and down; at least four square parasitic patch units with annular gaps in one diagonal line are printed on the upper surface of the first dielectric plate to form a rotary symmetric structure, and the angles between the adjacent parasitic patch units are equal; a feed network and at least four square radiation patch units with disturbance branches on a pair of opposite corners are printed on the upper surface of the second dielectric plate, and a metal grounding plate is printed on the lower surface of the feed network; each output arm of the feed network comprises a section of tapered gradual change line; the radiation patch units are located under the parasitic patch units; and the diagonal line where the disturbance branches are located and the diagonal line wherein the annular gaps of the parasitic patch units are located are consistent in direction. According to the antenna, high omni-directional circular polarizationcharacteristics can be kept in a 5G communication at 28GHz working frequency band, and the power capacity of the antenna is improved while the D2D communication requirement is met.

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

A wideband circular polarization directional antenna array based on a single double-face printing circuit plate comprises a dielectric substrate, a crossfeed network located on the front surface of the dielectric substrate, a grooved floor located on the reverse surface of the dielectric substrate, a reflecting plate located under the dielectric substrate and a nylon pillar connecting the dielectric substrate and the reflecting plate. Four unit groove antennas are etched in the grooved floor, each unit groove antenna is composed of an annular groove and two square grooves separately by 90 degrees, and four square grooves are further etched in the edges of the grooved floor to improve the gain characteristic of the array. A microstrip line of the tail end of the crossfeed network crosses the two square grooves of each unit groove antenna on the grooved floor, thereby exciting the unit groove antennas. Unit circular polarization is achieved through two orthogonal modes of the annular groove antennas and a feed method with the phase difference of 90 degrees, and a 2*2 antenna array is achieved through the crossfeed network. The wideband circular polarization directional antenna array based on the single double-face printing circuit plate can cover a wider frequency band, and meanwhile is simple in structure, low in cost, capable of being formed at one time and good in process consistency.

The invention discloses a circularly polarized differential dielectric resonator array antenna for use in the field of wireless communication. The circularly polarized differential dielectric resonator array antenna comprises a feed structure and four radiating elements. The radiating elements are differential feed circularly polarized rectangular dielectric resonators. The four radiating elements are successively rotated by 0 degree, 90 degrees, 180 degrees and 270 degrees around the center of the array. The feed structure is a parallel sequential rotation feed network and has the same element feed phase and element rotation angle. The array antenna has an impedance bandwidth of 12.1% (25.5 GHz to 28.8 GHz) and a 3dB axial ratio bandwidth of 11.1% (25.95 GHz to 29 GHz). The principal polarization of the array antenna is left-handed circular polarization, and the cross-polarization of the array antenna is right-handed circular polarization. The cross-polarization level on both radiating surfaces can reach below -15dB in a 3dB beam bandwidth. The antenna of the invention has good circular polarization characteristics, a low cross-polarization level, and can be directly integrated with an RF front-end differential circuit because of its differential feed characteristics.

The invention discloses a circularly polarized antenna array with a sequentially rotated feed network, belonging to the technical field of antennas. The circularly polarized antenna array comprises adielectric substrate, wherein the front surface of the dielectric substrate is provided with four antenna units; each antenna unit comprises a patch; an elliptical groove is formed in each patch; eachantenna unit is allowed to cover frequency band ranges of different impedance bandwidths and axial ratio bandwidths by changing the size of the patch of the unit, the sizes of a long axis and a shortaxis of the elliptical groove and an included angle between the long axis of the elliptical groove and one side edge of the patch; the antenna units are connected to the sequentially rotated feed network; the sequentially rotated feed network is connected to a ground plane; and the ground plane is located on the back surface of the dielectric substrate. Since the antenna units working in different frequency bands are connected with the sequentially rotated feed network to form an antenna array, so a circularly polarized array antenna with a small size, low profile, and wide impedance bandwidth and axial ratio bandwidth is obtained.

The invention discloses a planar microstrip patch antenna with broadband end-fire circular polarization characteristics. The antenna comprises a single-layer dielectric substrate, an upper metal patchand a lower metal patch, wherein the single-layer dielectric substrate comprises a bent metal wall, a coaxial feed probe and a loading metal probe which are arranged sequentially; the coaxial feed probe is used to feed the energy of the antenna; the bent metal wall is used as a reflection cavity; the loading metal probe is used for adjusting the impedance matching performance of the antenna; theupper metal patch and the lower metal patch sequentially comprise rectangular patches, arc-shaped gradient slot apertures, feed strips and fan-shaped dipole patches from one side to the other side; the arc-shaped gradient slot aperture is used for exciting a vertical polarization component; the feed strip is used for transferring the energy to the fan-shaped dipole patch; and a horizontal polarization component is excited by the fan-shaped dipole patch. The broadband circular polarization radiation function of the planar microstrip patch antenna is realized, and the planar microstrip patch antenna has the advantages of simple structure and wide common bandwidth of impedance and axial ratio.

The invention provides a circularly polarized antenna comprising a linearly polarized antenna source, a circularly polarized lens and a medium lens, wherein the linearly polarized antenna source is used for radiating linearly polarized waves; the circularly polarized lens includes a circular polarization device which is located above the linearly polarized antenna source and used for converting the linearly polarized waves into circularly polarized waves, the circular polarization device comprises a plurality of dielectric grids which are vertically and parallelly arranged, the plurality of dielectric grids are arranged in sequence along the horizontal direction at equal intervals; and the medium lens is connected above the circular polarization device and is used for refracting and converging the circularly polarized waves. The antenna can be used for 5G mobile communication, so that the wider axial ratio bandwidth is achieved, meanwhile, the gain of the antenna is improved, moreover,the wave beam scanning of the antenna is realized, and the antenna is suitable for the scene of mobile communication such as the fifth generation in the future.

The invention discloses a broadband circularly-polarized antenna. The antenna comprises an upper-layer dielectric plate and a lower-layer dielectric plate, wherein the upper-layer dielectric plate andthe lower-layer dielectric plate are connected through four metal columns, the lower surface of the upper-layer dielectric plate comprises four strip feeders, and the upper surface of the upper-layerdielectric plate comprises an annular patch; and a feed port is arranged at one end of each strip feeder, the four feed ports feed the four strip feeders through the four metal columns respectively,the four strip feeders couple electromagnetic wave energy to the annular patch, and the annular patch radiates the electromagnetic wave energy. According to the broadband circularly-polarized antenna,coupling feeding is performed on the annular patch of the antenna through the four strip feeders, impedance bandwidth and axial ratio bandwidth of the circularly-polarized antenna are increased, andthe circularly-polarized antenna has good broadband characteristics and circular polarization characteristics.

The invention discloses a slot-coupled circularly-polarized micro-strip antenna. The slot-coupled circularly-polarized micro-strip antenna comprises a radiation paster layer medium plate, a feed network layer medium plate and a reflection aluminum plate which are arranged from up to down. The radiation paster layer medium plate is formed in such a manner that a radiation paster is applied to the side of an insulating medium plate. The feed network medium plate is formed in such a manner that a copper film layer is applied to the side of the insulating medium plate. Two coupled slots are formed in the copper film layer in an etching manner. A circularly-polarized feed network is applied to the other side of the insulating medium plate. The coupled slots are in a concave shape, the two concave-shaped coupled slots intersect on only one corner point, and the two coupled slots are perpendicular to each other and symmetrical. Both concave ports of the two concave-shaped coupled slots face the external part of the space commonly covered by the two concave-shaped coupled slots. The slot-coupled circularly-polarized micro-strip antenna is different from a conventional straight slot design, bent parts of the concave slots are capable of realizing tuning of an antenna standing wave curve, and the two concave slots are arranged in a perpendicular and symmetrical manner, so that two electromagnetic waves which are orthogonal in polarity and identical in amplitude are guaranteed to be excited.

A circularly polarized antenna exhibiting a high performance characteristic can be produced by utilizing a ground plane, a half-loop, and an electric dipole in a predetermined configuration. The circularly polarized antenna can provide benefits, such as wide axial ratio bandwidth, high gain, and simple structure, over other unidirectional circularly polarized antennas.

A GNSS choking coil antenna based on a wave absorbing material is disclosed. The antenna comprises a multipath suppression plate, a plurality of first wave-absorbing units, an antenna unit, a plurality of second wave-absorbing units and a plurality of third wave-absorbing units. The plurality of first wave-absorbing units are annularly arranged along a center of the multipath suppression plate andare vertically arranged on an upper surface of the multipath suppression plate. The antenna unit is arranged on the upper surface of the multipath suppression plate and is located in a ring formed byarranging the plurality of first wave-absorbing units. The plurality of second wave-absorbing units are annularly arranged along the center of the multipath suppression plate and are obliquely arranged on the upper surface of the multipath suppression plate. The plurality of third wave-absorbing units are annularly arranged along the center of the multipath suppression plate and are arranged on an outer peripheral surface of the multipath suppression plate, and the plurality of third wave-absorbing units are vertical to the plurality of first wave-absorbing units. By using the GNSS choking coil antenna of the invention, most of multipath signals can be absorbed, most of surface waves formed on the outer peripheral surface of the multipath suppression plate can be absorbed, an interferenceof the surface waves is reduced, and a multipath suppression capability of the antenna is effectively improved.

The invention discloses a broadband electromagnetic dipole circularly polarized antenna, and the antenna comprises an electric dipole, a magnetic dipole, an inverted L-shaped feed sheet, a metal wall,a floor and a coaxial connector; the electric dipole consists of a pair of metal sheets parallel to the floor, and the magnetic dipole consists of a pair of metal sheets which are vertical to the floor and are short-circuited with the floor; the electric dipoles are arranged on the magnetic dipoles and are in central symmetry about the center of the floor; the inverted L-shaped feed sheet is arranged on the floor, is connected with an inner conductor of the coaxial connector arranged on the back surface of the floor and is used for coupling and feeding the electric dipole and the magnetic dipole, and the metal walls are arranged in the centers of four sides of the floor. The broadband electromagnetic dipole circularly polarized antenna has better broadband performance, and is convenient to process and good in mechanical stability.

The invention discloses a broadband circular polarization transmission array antenna based on a dielectric structure. The transmission array antenna comprises a transmission array plane and a feed source; wherein the transmission array surface comprises eight and a plurality of array surface units which have different sizes and are arranged in a linear form; the feed source is a broadband linearly polarized antenna; the feed source is located on the central axis of the transmission array plane, vertically irradiates the transmission array plane, and forms a 45-degree included angle with the transmission array plane in the horizontal direction. According to the invention, an all-dielectric structure is adopted, and a broadband circularly polarized transmission array antenna design is provided. In principle, the antenna is a circularly polarized antenna in a traveling wave form and is not limited by the resonance principle in the traditional design, so that the antenna has a relatively wide axial ratio bandwidth, and the bandwidth can reach 51.8% and is far superior to the current technical level. In addition, the antenna is stable in performance in a working frequency band and has the characteristic of high gain.

The invention discloses an optically controlled polarization-reconfigurable monopole antenna. The optically controlled polarization-reconfigurable monopole antenna comprises a reflecting plate and a dielectric substrate, the dielectric substrate is fixed to the position above the reflecting plate through supporting structures, an antenna radiation unit, a parasitic unit, a microstrip line feed unit and optical switches are printed on the upper surface of the dielectric substrate, and an earth plate unit is printed on the lower surface of the dielectric substrate; the antenna radiation unit comprises a C-shaped monopole, and the C-shaped monopole is provided with a groove and L-shaped grooves; the parasitic radiation unit is located in the groove, and the optical switches are located at thejunction of the microstrip line feed unit and antenna radiation unit; and the optically controlled polarization-reconfigurable monopole antenna further comprises a coaxial feeder line unit, and the coaxial feeder line unit feeds electricity to the microstrip line feed unit through the dielectric substrate. The optically controlled polarization-reconfigurable monopole antenna is of a planar structure, radiates directionally by using the reflecting plate, has good directionality and can achieve a polarization-reconfigurable effect in three modes.

The invention discloses a broadband circular polarized antenna with equal-ripple axial ratio responses, and belongs to the microwave technical field; the circular polarized antenna axial ratio frequency responses have a plurality of minimum values in the work frequency band, and the axial ratio amplitude value in the frequency band is lower than certain set value, thus forming the broadband equal-ripple axial ratio responses. The circular polarized antenna axial ratio band width can be effectively expanded; a feed network is designed, thus enabling the amplitude ratio and phase difference of excitation signals of two orthogonal modes of the antenna to respectively form corrugated changes around 1 and + / -90 degrees, and forming the broadband equal-ripple axial ratio responses.

The invention provides a circularly polarized antenna unit and an antenna array. The circularly polarized antenna unit comprises a metal ground, and a first dielectric plate, a second dielectric plate and a third dielectric plate which are sequentially stacked on the metal ground, wherein the third dielectric plate is provided with four rectangular radiation patches and a plurality of metal columns, and the plurality of metal columns are distributed in a shape like a Chinese character 'tian' to form four rectangular back cavities in one-to-one correspondence with the four rectangular radiation patches; four coupling gaps are formed in the upper surface of the second dielectric plate, and the four coupling gaps are in one-to-one correspondence with the four rectangular radiation patches; a hexagonal cavity formed by metal columns is also arranged in the second dielectric plate, and four metal matching columns are arranged in the hexagonal cavity; and a feed transverse slit is formed in the upper surface of the first dielectric plate, and the first dielectric plate is also internally provided with a first SIW feed structure composed of metal columns. The circularly polarized antenna unit employs the hexagonal cavity structure, can reduce the size of a microwave and millimeter wave antenna, increases the working bandwidth, and improves the antenna gain.

The invention discloses a broadband circularly polarized planar antenna array applied to a millimeter wave communication system, which comprises an antenna body and a feed network, and is characterized in that the antenna body is formed by equidistantly arranging a plurality of antenna units in a two-dimensional direction; the antenna unit sequentially comprises a circularly polarized radiator, a first dielectric substrate, a bonding layer, a metal ground, a second dielectric substrate and a microstrip feeder from top to bottom; the circularly polarized radiator is connected with the metal ground through four metal holes penetrating through the first dielectric substrate and the bonding layer; the circularly polarized radiator comprises two pairs of orthogonal dipoles and is connected with the metal ground through four metal holes penetrating through the first dielectric substrate and the bonding layer; each pair of dipoles comprises two monopoles which are symmetrical around the center; the two pairs of dipoles are different in size, and the design enables the currents of the two pairs of orthogonal dipoles to show a 90-degree phase difference, thereby generating circular polarization radiation. The circular polarization performance is improved by loading a thin strip-shaped branch knot on a long dipole arm.

The invention discloses a low-coupling dual-frequency dual-radiation pattern antenna, the antenna comprises a first dielectric plate, a second dielectric plate and a metal grounding plate, the first dielectric plate is composed of a first substrate, an octagonal patch and a parasitic patch, the octagonal patch and the parasitic patch are placed on the upper surface of the first substrate, and the octagonal patch is provided with a gap; the second dielectric plate is composed of a second substrate and a circular patch, the circular patch is placed on the upper surface of the second substrate, and an annular gap is formed in the circular patch. The metal grounding plate is connected with the first dielectric plate through the first probe and is connected with the second dielectric plate through the second probe. The antenna with the circular polarization normal radiation characteristic and the antenna with the linear polarization conical radiation performance are integrated under the same aperture, the space occupied by the antenna is greatly reduced, and the dual-band, dual-polarization and dual-radiation directional diagram characteristics of the antenna are achieved.

The invention discloses a broadband circular polarized antenna with equal-ripple axial ratio responses, and belongs to the microwave technical field; the circular polarized antenna axial ratio frequency responses have a plurality of minimum values in the work frequency band, and the axial ratio amplitude value in the frequency band is lower than certain set value, thus forming the broadband equal-ripple axial ratio responses. The circular polarized antenna axial ratio band width can be effectively expanded; a feed network is designed, thus enabling the amplitude ratio and phase difference of excitation signals of two orthogonal modes of the antenna to respectively form corrugated changes around 1 and + / -90 degrees, and forming the broadband equal-ripple axial ratio responses.