881 results about "Circularly polarized antenna" patented technology

The invention discloses a circular polarized antenna with a wide wave beam width and a small size. The antenna comprises a square paster; two notch grooves of an open circuit of a terminal are arranged on the square paster, wherein the two notch grooves are mutually orthogonal; the paster is fixed on a square grounding reflecting surface by a coaxial line. And four short-circuit columns of the open circuit of the terminal are arranged on the reflecting surface, so that the size of the reflecting surface is reduced. According to the invention, a signal feeding technology is utilized to excite the two orthogonal notch grooves to work in a circular polarization mode. According to the invention, an impedance bandwidth reaches 19%, wherein a standing-wave ratio is less than 2; and a 3d axial ratio bandwidth reaches 3.8%. In an axial ratio bandwidth, a 3d B wave beam width reaches a value by adding 101.4 degrees with 1.4 degrees or subtracting the 1.4 degrees from the 101.4 degrees as well as a gain reaches a value by adding 5.76dBi with 0.18dBi or subtracting the 0.18dBi from the 5.76dBi. The circular polarized antenna has advantages of compact antenna dimension, light weight, low cost and easy manufacture. Especially, the circular polarized antenna has advantages of good impedance bandwidth, wide radiation wave beam, and high gain. Therefore, the circular polarized antenna can be widely applied to satellite communication and traffic navigation.

A wireless device having an improved antenna system is disclosed comprising one or more antenna, preferably circularly polarized antenna, for transmitting or receiving a signal, and one or more floating ground planes, wherein the floating ground plane preferably is electrically isolated from and in sufficient proximity to the antenna so that it is inductively coupled to the antenna. The floating ground plane may comprise one or more of a strip, band, foil, plate, block, wire mesh, sheet or coating of conductive material and, for example, may be a relatively thin copper strip, band, foil or coating. The circularly polarized antenna, preferably comprises a flat planar shaped radiating element sized and configured to resonate at a predetermined, desired frequency, frequencies or band of frequencies, and a flat planar shaped antenna ground, both radiating element and antenna ground formed on the same printed circuit board. The radiating element is electrically isolated from the antenna ground but sufficiently close to resonate at the desired frequencies. Preferably the floating ground plane is larger than or more massive than the antenna ground, and preferably larger than or more massive than the radiating element. In a further embodiment the wireless device comprises a housing for interfacing with a user, the housing comprising a conductive contact exposed to the exterior of the housing and configured to be contacted by a user, wherein the conductive contact is electrically connected to the floating ground plane, preferably so that the user is coupled to the antenna and becomes part of the antenna system. The floating ground plane may also preferably be configured to substantially cover or overlap the antenna, and may also be configured to distribute and propagate the electromagnetic signals away from the head of the user.

The wireless communication device contains at least one conductive tab that provides an antenna. The tab(s) form a pole antenna, and the tabs may also be attached across a slot to form a slot antenna. The tab(s) may be attached across a slot created in a package to form a slot antenna, or the tab(s) may be attached to a slot that is created as part of the wireless communication device to form a slot antenna. The tab(s) and / or the slot may also contain an adhesive material to attach the wireless communication device to a package, container or other material. More than one slot may be provided to form a circularly polarized antenna. The carrier may be a conductive material in which tabs are formed as part of the carrier before the wireless communication device is attached. The wireless communication device may have an asymmetrical antenna arrangement.

When configuring a film antenna for receiving a circular polarized wave, at least one loop antenna is formed on a transparent plastic film and, at the same time, a non-powered element constituted by a wire-shaped conductor independent from the antenna conductor configuring the loop is arranged near this loop antenna. The non-powered element arranged on the side of the loop antenna is configured by a first part and a second part. The first part is made close to the loop antenna in a substantially parallel state. When a monopole antenna is used in place of the loop antenna, by combining this with a wire-shaped conductor orthogonal to this, it becomes possible to receive a circular polarized wave by a configuration providing a power transfer part between the two. It is also possible to configure a composite antenna by mounting another antenna on the transparent plastic film. This antenna can be used as an antenna of a navigation system.

A circularly polarized antenna includes a dielectric substrate having a first via array in the form of a cylindrical cavity, a micro-strip circular patch antenna located at the center of the cylindrical cavity and formed on the dielectric substrate to radiate a signal, and a rectangular dielectrically loaded waveguide having a second via array and serving to feed the signal to the micro-strip circular patch antenna. Accordingly, the circularly polarized antenna prevents impedance mismatch between the micro-strip antenna and the dielectrically loaded waveguide and broadens an impedance bandwidth thereof.

The invention discloses a low-cost microwave- and millimeter-wave polarized antenna of the multi-layer PCB (Printed circuit board) process. The polarized antenna is of a multi-layer structure and comprises a quadrate radiating metal patch, an upper dielectric substrate, a metal floor equipped with an H-shaped coupling gap, a medium dielectric substrate, a feed metal plate with power division network, a lower dielectric substrate and a bottom metal floor; the quadrate radiating metal patch is coupled with the floor equipped with the H-shaped coupling gap to realize feed; the feed network of a microstrip line structure is positioned below the floor; the metal floor equipped with the H-shaped coupling gap is connected with the bottom metal floor through a metal through hole; the feed metal plate with the power division network is connected with the bottom metal floor through a second metal through hole to form a coaxial microstrip line conversion structure by which feeding from the bottom part of the antenna is realized. The antenna has the characteristics that the frequency band is wide, the size is small, the cost is low, the manufacturing and processing are simple, and the axial ratio feature is great.

The invention provides a low-profile circular-polarization antenna that can be implemented at a reduced mounting cost of components. Two linear-polarization surface-mount antennas are mounted on a mounting substrate such that their planes of polarization are perpendicular to each other in the direction normal to the mounting surface, and an amplification circuit, a shield case for covering the circuit, and a phase circuit for sending signals having the same amplitude and a phase difference of 90 degrees to the two surface-mount antennas are provided on the same mounting surface.

The invention relates to a wireless communication device that is capable of communicating using a pole antenna in a first mode and a slot antenna in a second mode. The wireless communication device contains at least one conductive tab that provide an antenna. The tab(s) form a pole antenna, and the tabs may also be attached across a slot to form a slot antenna. The wireless communication device can communicate at different frequencies using the pole antenna in a first mode and the slot antenna in a second mode. The tab(s) may be attached across a slot created in a package to form a slot antenna, or the tab(s) may be attached to a slot that is created as part of the wireless communication device to form a slot antenna. The tab(s) and / or the slot may also contain an adhesive material to attach the wireless communication device to a package, container or other material. More than one slot may be provided to form a circularly polarized antenna. The wireless communication device can be placed inside a conductive package using a slot antenna to provide unshielded communications. The wireless communication device can be further adapted to detect when the package is opened and to communicate such information. The wireless communication devices can be printed or placed on a carrier or support, such as film, to be stamped onto packages in a manufacturing facility and / or assembly line. The carrier may be a conductive material in which tabs are formed as part of the carrier before the wireless communication device is attached.

An antenna system (10) capable of transmitting electromagnetic radiation using the technique of combining two quadrature signals for either right hand circular polarization or left hand circular polarization using a circularly polarized antenna (30), or alternately, either horizontal or vertical polarization using a linearly polarized antenna (36) while incorporating feedback for automatically correcting for amplitude and phase variations in the quadrature paths using a switch (12) which selects the sense of the polarization and electronic optimization of the transmit antenna (30, 36). The antenna system includes a control circuit having a polarization switch (12) for receiving a transmission signal. The switch (12) generates first and second output signals which are substantially similar to the transmission signal, and determines whether to apply the transmission signal to one of a first or a second switch output. A coupler (14) receives the first and second switch outputs and generates first and second output signals having a predetermined phase difference. A variable detector (16, 18) detects and adjusts a relative amplitude and phase of the respective first and second output signals. An error correction circuit (34) determines an adjustment to the variable phase detector to vary the phase and amplitude of the first and second output signals in accordance with the relative amplitude and phase of the respective first and second output signals.

A circularly polarized antenna has a dielectric substrate, a ground conductor which is piled up one surface side of the dielectric substrate, a circularly polarized type of antenna element formed on an opposite surface of the dielectric substrate, a plurality of metal posts whose respective one end sides are connected to the ground conductor and penetrate the dielectric substrate along a thickness direction thereof, and whose respective other sides extend up to the opposite surface of the dielectric substrate, the plurality of metal posts configuring a cavity by being provided at predetermined intervals so as to surround the antenna element, and a conducting rim which short-circuits the respective other end sides of the plurality of metal posts along an array direction thereof, and is provided so as to extend by a predetermined distance in a direction of the antenna element at the side of the opposite surface of the dielectric substrate. With the circularly polarized antenna, a radiation characteristic of the antenna can be made to be a desired characteristic by preventing a surface wave from being generated by means of the cavity and the conducting rim, and a frequency characteristic of the antenna gain can be made to have a sharp notch within the RR prohibited band by utilizing a resonance of the cavity. Accordingly, the circularly polarized antenna is effective for reducing radio interference with the EESS or radio astronomical services.

The invention discloses a compact type plane dual-band omnidirectional circularly polarized antenna. The compact type plane dual-band omnidirectional circularly polarized antenna is characterized by comprising a plane radiating antenna, a center shorting pin, an input connector and a feed probe; the plane radiating antenna sequentially comprises a capacitor chip, a medium substrate I, a radiating chip, a medium substrate II and a floor from top to bottom, and an air layer is arranged between the radiating chip and the medium substrate II; the capacitor chip is connected with an inner conductor of the input connector through the feed probe, protection holes are arranged at corresponding positions on the radiating chip and the floor, the feed probe penetrates through the positions on the radiating chip and the floor, and inner diameters of the protection holes are larger than the diameter of the feed probe; and the radiating chip is composed of a primary round radiation chip and three groups of radiating units which are of same structures, the three groups of radiating units are loaded on the periphery of the primary round radiation chip and composed of six arc vibrators, and each group of radiating units is composed of two arc vibrators with different length. The antenna has the advantages of being good in omnidirectional radiation, good in circular polarization in the ranges of 360 degrees on a plane and flexible in dual-band ratio.

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 circularly-polarized antenna is provided, and includes a conductive backplane with a plurality of panels, a vertical array of patch radiators disposed on one of the backplane panels, and a feed stripline disposed on the backplane panel. The backplane panels are vertical, planar, rectangular and form a right prism. The vertical array has a radiator spacing of one wavelength, each radiator has a face and four edges, and each edge has a length of approximately one half wavelength. The feed stripline includes an input coupled to a coaxial feed cable, and a pair of outputs, orthogonal in position and phase, coupled to each of the radiators.

The invention relates to a four-band multi-polarization co-aperture feed source. The four-band multi-polarization co-aperture feed source is formed by combining a double linear polarization antenna of a Ku band and a double circular polarization antenna of a Ka band and comprises a conical horn, a Ku circular waveguide, a tuning screw, a Ku flange, a horizontal polarization power divider, a first flange, a vertical polarization power divider, a medium rod, a circular waveguide feed window, a stop screw, a transition section and a double circular polarization antenna. The antenna of the Ku band uses four ports for symmetrical feeding to improve the symmetrical characteristic of a directional diagram, a transmission waveguide of an electromagnetic field of the Ku band is used as the transition section of the electromagnetic field of the Ka band, and the resonance medium rod is embedded into the waveguide of the Ku band for transmitting electromagnetic waves of the Ka band so that compactness of the antenna is greatly improved. By means of dielectric waveguides and conical horn nesting technologies, the purposes of achieving antenna beam conformity and sharing one phase center are achieved, uniformities of directional diagrams and uniformities of the phase centers in four working bands are guaranteed, isolation among bands is increased, and the compactness of the antenna is improved.

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

The invention discloses a single-fed dual-bandwidth wave beam circular polarization antenna which comprises a metal floor (1), two layers of dielectric slabs (2), a radiation paster (3), a coaxial feed unit (4) and a metal bracket (5), wherein the radiation paster (3) comprises a coupling radiation paster (3a), from which a triangular corner is cut, and a main radiation paster (3b); complementary opening resonance rings (6) are etched on the main radiation paster (3b) and embedded with one another; the central points of the complementary opening resonance rings (6) are overlapped, and the opening directions are opposite; the main radiation paster (3b) is printed on the upper surfaces of the dielectric slabs (2); the coupling radiation paster (3a) is printed on the middle plane of the two layers of dielectric slabs (2); the coaxial feed unit (4) is arranged in the two layers of dielectric slabs (2) in a deviation manner; and the metal bracket (5) is symmetrically arranged on the four corners of the two layers of dielectric slabs (2). The dual-bandwidth circular polarization antenna with the characteristics of wide wave beam, high gain and low coupling is realized and can be applied to satellite communication.

A printed dual-band Yagi-Uda antenna is disclosed, which includes a substrate, a first driver, a first director, a second driver and a reflector. The first driver is formed on the substrate, and is utilized for generating a radiation pattern of a first frequency band. The first director is formed at a side of the first driver on the substrate, and is utilized for directing the radiation pattern of the first frequency band toward a first direction. The second driver is formed between the first driver and the first director on the substrate, and is utilized for generating a radiation pattern of a second frequency band. The reflector is formed at another side of the first driver on the substrate, and is utilized for reflecting both the radiation patterns of the first frequency band and the second frequency band toward the first direction.

A loop antenna unit (2), a balanced line (3), and two perturbation elements (4) are formed on a dielectric board (1) by using manufacturing methods, such as printing and etching. The loop antenna unit (2) is formed along the circumference of a circle, and is connected to the balanced line (3). Each of the two perturbation elements (4) is a member in the shape of a tooth which is inclined 45 degrees against a direction of feeding of power via the balanced line (3) and which is projecting from the loop antenna unit (2) in an inward direction toward the center of the loop antenna unit (2). The two perturbation elements (4) are arranged at two opposite points in the loop antenna unit (2) so that they are opposite to each other.

The disclosed system, device and method for a signal modulation apparatus generally includes a first signal generator suitably configured to generate a first continuous wave radio frequency (RF) signal, and a second signal generator suitably configured to generate a second continuous wave RF signal. A dual-circular polarized antenna may be adapted to receive the first continuous wave RF signal into a right-hand port and the second continuous wave RF signal into a left-hand port, where the signals are combined into a modulated RF signal in the dual-circular polarized antenna.

The invention discloses a zeroth-order resonator and a low-profile zeroth-order resonator omnidirectional circularly polarized antenna. The zero-order resonator is composed of a dielectric substrate, a metal patch, a metal floor and a short-circuit pin. The metal patch and the metal floor are respectively adhered on the two relatively parallel surfaces of the dielectric substrate. One end of the short-circuit pin is connected with the metal patch, and the other end is connected with the metal floor. The zeroth-order resonators are arranged at the external side of the radiation type feed network of the antenna in a surrounding way. Phase difference between two polarizations is enabled to be fixed at 90 degrees by the zeroth-order resonators, electric dipoles and magnetic dipoles are constructed by using a mode of circular ring group arrays, and the design of the zeroth-order resonator units and optimization of the circular ring array circularly polarized antenna are separated without considering the phase problem of two mutually perpendicular linear polarization components so that optimization efficiency can be enhanced, system resources can be saved and design efficiency can be enhanced. Besides, the designed omnidirectional circularly polarized antenna has the low-profile characteristic and can be applied to systems with the requirement for the antenna profile.

A dual circularly polarized antenna is described. In some embodiments, the antenna includes a waveguide having an aperture at a first end and a conducting component at a second end, the conducting component shorting the waveguide. A first driven dipole is substantially orthogonal to a second driven dipole, and both the first and second driven dipoles are located near the aperture of the waveguide. The first and second driven dipoles are connected to the conducting component by one or more plates and configured to be fed in quadrature. A resonator is positioned near the first and second driven dipoles.

The invention belongs to the technical field of design and manufacture of millimeter-wave circularly-polarized antennas, aims to solve the problem of difficulty in integration of broadband, high efficiency and arraying of existing millimeter-wave circularly-polarized antennas, and provides a broadband circularly-polarized panel array antenna. The broadband circularly-polarized panel array antenna has the advantages that a novel 90-degree phase delay line is used for feed of a cross recess, four parasitic patches added above the cross recess are used for improving antenna unit gain and 3dB axial ratio bandwidth, and the designed 90-degree phase delay line has three independent branches which are used for phase delay, amplitude compensation and matching adjustment respectively; a group of short-circuit metal holes are designed beside a strip line to effectively inhibit spreading of a TEM (transverse electromagnetic) mode outside a feed network area, unit cross coupling is reduced greatly, and arraying performance is guaranteed; the antenna made of a multilayer PCB (printed circuit board) has the advantage of low cost and is applicable to millimeter-wave large-scale circularly-polarized arraying, and the problem of difficulty in integration of circularly-polarized antenna efficiency and the axial ratio bandwidth on millimeter-wave frequency bands is solved.

The invention provides a circularly polarized OAM (orbital angular momentum) reflect array antenna. The circularly polarized OAM reflect array antenna is used for improving interference rejection of the antenna and comprises a feed source antenna unit and a reflector, wherein the feed source antenna unit adopts a circularly polarized antenna, the radiation direction of the feed source antenna unitfaces one side, where a radiation patch is printed, of each dielectric material on the reflector, and the feed source antenna is fixed relative to the reflector; the reflector comprises N*N radiationunits which are arranged equidistantly and periodically, N is larger than or equal to 2, each radiation unit comprises a dielectric material plate, the radiation patch printed on one side surface ofthe dielectric material plate and a metal floor arranged on the other side surface, the phase of each radiation unit is determined according to a phase compensation formula of the circularly polarizedOAM reflect array antenna, and compensation of each phase is realized by a rotating unit; each radiation patch comprises two concentric ring patches, a pair of rectangular gaps are formed in an axispassing through the circle center of each ring patch, and an antenna phase shift curve is controlled by adjusting radius of each outer ring patch.

The present invention relates to a directional coupler feed low-profile cavity-backed circularly polarized antenna. The common cavity-backed circularly polarized antenna has complicated structure and large volume and can be planely integrated. In the invention two surfaces of the medium substrate is plated with metal layers, the upper metal layer is etched for the feed microstrip line, the branch line directional coupler with a microstrip form and the co-ground coplanar waveguide transmission line, a plurality of plated-through holes which are arranged to a square are arranged penetrating the upper metal layer, the medium substrate and the lower metal layer, the cavity is formed and the coplanar waveguide transmission line extends into the cavity. The lower metal layer is etched with two elongated radiating gap which are perpendicular to each other. Comparing with the existing cavity-backed circularly polarized antenna the invention adopts the 3dB directional coupler with 90 degree phase shift as the feed network, on the base of reserving the high grin character of the cavity-backed circularly polarized antenna, and the 3dB axial ratio bandwidth of the antenna is evidently increased. The whole structure can be manufactured with the PCB technique and the cost is low, the structure can be integrated with plane circuit seamlessly and the integrity is increased.

First and second monopole conductive elements are disposed so as to be approximately mutually perpendicular and so that respective open ends are adjacent, and with respect to a straight line that passes between open ends of the first and second monopole conductive elements and through a center of a conductive ground plane, a first conductive ground plane portion formed on a first monopole conductive element-side of the straight line among the conductive ground plane and the first monopole conductive element are formed so as to be approximately symmetrical to a second conductive ground plane portion formed on a second monopole conductive element-side of the straight line among the conductive ground plane and the second monopole conductive element.

The invention belongs to the field of satellite mobile communication and relates to a circularly polarized antenna design, in particular to a circularly polarized dipole antenna for satellite communication. The circularly polarized dipole antenna has the advantages of wide band, wide wave beam and good low-elevation angle circular polarization performance. The circularly polarized dipole antenna comprises a dielectric substrate, a metal reflecting plate, four dipole antenna radiation arms, four parasitic patches, four metal conductive walls and a coaxial feeder; the conductive walls capable ofbroadening lobes are applied to the circularly polarized crossed dipole antenna in a combined manner; the metal reflecting ground plate, the conductive walls and the parasitic patches jointly form magnetic dipole antennas; lobe broadening is carried out on the basis of the complementation of the radiation patterns of the magnetic dipoles and the electric dipoles, so that gain at a low elevation angle can be improved; and thus, the circularly polarized dipole antenna for satellite communication has the advantages of wide band, wide wave beam, low elevation angle, good circular polarization performance, simple structure and easiness in installation, and is more suitable for satellite communication.

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.

A spiral cylindrical ceramic circular polarized antenna, wherein a cylindrical ceramic body is made of microwave ceramic material with the dielectric constant equal to or greater than 20, and spiral radiation metallic electrodes are printed on the ceramic body to cause 90 degrees of phase difference between the neighboring spiral radiation metallic electrodes. A BALUN and transformer component, PCB, or ceramic ground plane is configured on the bottom tie-plate of the ceramic body to transfer the feed signal from unbalanced signal to balanced signal and to offer a matching impedance. With this design, two mutually perpendicular electromagnetic fields are formed to create CPW (Circular Polarized Wave), in order to facilitate the reception of GPS satellite signal.

The invention relates to a one-point short-circuit circularly polarized antenna with a low-profile cavity-backed annular slot. The existing cavity-backed circularly polarized antenna based on one-point short-circuit of the annular slot has complex structure, large volume, inability to planar integration, and high cost. In the present invention, a metal layer is plated on both sides of the dielectric substrate, and the upper metal layer is etched with a microstrip line for power feeding and a common ground coplanar waveguide transmission line, and the middle metal strip of the coplanar waveguide transmission line extends outwards as a microstrip line . Through the upper metal layer, the dielectric substrate and the lower metal layer, a plurality of metallized through holes arranged in a circle are opened to form a cavity, and the coplanar waveguide transmission line extends into the cavity. The lower metal layer is etched with a circular radiation slit with a short circuit in the area corresponding to the cavity. Compared with the conventional cavity-backed circularly polarized antenna composed of a metal cavity, the present invention is manufactured by common PCB technology, has low manufacturing cost, can be seamlessly integrated with a microstrip circuit, and improves system integration.

Provided is a broadband circularly polarized antenna using a metasurface. The antenna includes a lower substrate, an upper substrate stacked on the lower substrate, a radiator, which is located between the lower substrate and the upper substrate, has a rectangular patch shape in which two triangular removed parts are formed by removing opposite corners in a triangular shape, extends so as to have a predetermined width and length from one end of a hypotenuse of one triangular removed part of the triangular removed parts, and includes an extended strip having a feed hole formed therein, and the metasurface formed on an upper surface of the upper substrate and including a plurality of unit cells. The antenna has improved performance, such as a low profile, a broadband circular polarization characteristic, a high gain characteristic, and the like.