159results about How to "Wide Impedance Bandwidth" patented technology

The invention provides an ultra-wideband antenna. The ultra-wideband antenna comprises a dielectric substrate, wherein a radiation unit, a feeding structure and a ground plane are printed on the dielectric substrate; the radiation unit is a forked chip; the feeding structure is a coplanar waveguide feeding structure; and the ground plane is a coplanar waveguide ground plane. The ultra-wideband antenna has a coplanar waveguide structure, so that a single planar printed antenna structure can be realized; the ultra-wideband antenna can be easily integrated with a microwave integrated circuit; the coplanar waveguide ground plane can serve as the ground plane of the whole antenna, and particularly for the coplanar waveguide structure with a wideband slot structure, wideband work can be realized, and the electromagnetic interference of outside on the antenna can be effectively avoided; and wideband impedance bandwidth can be easily realized, and the efficiency of the antenna is improved, so that higher antenna gain can be achieved.

The invention provides a miniaturized dual-frequency antenna. The miniaturized dual-frequency antenna comprises a medium substrate and a monopole antenna printed on the medium substrate. The monopole antenna comprises a main radiating unit, a coplanar waveguide feeding signal strip line connected with the main radiating unit, coplanar waveguide ground planes and auxiliary radiating units arrangedbetween the main radiating unit and the coplanar waveguide ground planes. The main radiating unit is a U-shaped radiating unit, the lower end of the coplanar waveguide feeding signal strip line is connected with an inner conductor of SMA (Stone Matrix Asphalt), and an outer conductor of the SMA is connected with the coplanar waveguide ground planes. The invention can be used for receiving and transmitting radio waves. The invention can be used for terminals for electronic reconnaissance and electronic countermeasure and tracking and electromagnetic protection, wireless local area network and global microwave access terminal receiving equipment. The invention has the advantages of simple structure, wide operating bandwidth and low cost, and is convenient for mass produce.

The invention discloses a dual polarization base station antenna with Y-shaped feed units. The dual polarization base station antenna with the Y-shaped feed units comprises a dielectric substrate, a metallic reflection plate, a first coaxial line and a second coaxial line. The two sides of the metallic reflection plate are provided with metal flanges. The lower surface of the dielectric substrate is provided with a first annular radiating element, a second annular radiating element, a third annular radiating element and a fourth annular radiating element, wherein the first annular radiating element and the second annular radiating element are in mutual symmetry to form a first antenna structure, and the third annular radiating element and the fourth annular radiating element are in mutual symmetry to form a second antenna structure. The upper surface of the dielectric substrate is provided with the first Y-shaped feed unit and the second Y-shaped feed unit. The first coaxial line is connected with the second annular radiating element and the first Y-shaped feed unit. The second coaxial line is connected with the fourth annular radiating element and the second Y-shaped feed unit. The dual polarization base station antenna is good in performance, simple in structure, easy to process, low in processing cost and convenient to adjust.

The invention provides a dual-mode vortex wave beam dual-circular polarization four-element array antenna having a concise structure. By adopting a circular polarization unit continuous rotating technology, a phase difference required by generating of vortex wave beams is acquired, and by adopting array element equiamplitude in-phase feeding, a feeding network structure is simplified to a great extent. The array antenna comprises four parasitic units, an upper layer dielectric substrate, four excitation units, a middle layer dielectric substrate, a metal layer floor, a lower layer dielectric substrate, and a feeding network. The parasitic units and the excitation units are disposed on the upper surface of the upper layer dielectric substrate and the upper surface of the middle layer dielectric substrate. An air layer is used to separate the upper layer dielectric substrate and the middle layer dielectric substrate. The feeding network is disposed on the lower surface of the lower layer dielectric substrate, and the feeding network is connected with the excitation units by adopting a metal probe penetrating the floor. A left circular polarization wave having a vortex mode of 1=+1 and a right circular polarization wave having the vortex mode of 1=-1 are generated, and at the same time, a good circular polarization radiation characteristic is provided, and in addition, the antenna has advantages of concise structure, small size, low profile, light weight, and easy conformality.

The invention discloses an ultra-wideband planar phased array antenna and a beam scanning method thereof, and relates to the technical field of antennas. The ultra-wideband planar phased array antennacomprises a dielectric substrate, and a liquid crystal phase shifter network which is externally applied with a bias voltage and arranged on the dielectric substrate, wherein the liquid crystal phaseshifter network is composed of a plurality of liquid crystal phase shifter units. An antenna unit array which covers a plurality of frequency bands is arranged above the liquid crystal phase shifternetwork; and the antenna unit array is composed of a plurality of antenna units, wherein the antenna unit is a Vivaldi antenna with a slot line, and a liquid crystal phase shifter is powered through amicrostrip line-slot line structure. Compared with the prior art, the problems that the ultra-wideband phase-controlled profile is high in profile degree, large in antenna loss and low in utilizationrate are solved.

The invention discloses a circular polarized antenna with omnidirectional broad axial ratio beam width. The circular polarized antenna comprises a parasitic element, an upper-layer medium baseplate, an exciting element, a middle-layer medium baseplate, an earthing unit, a lower-layer medium baseplate and a 3dB mixed electric bridge electric feeding network, wherein the parasitic element and the exciting element are respectively arranged on the upper surfaces of the upper-layer medium baseplate and the middle-layer medium baseplate; the upper-layer medium baseplate and the middle-layer medium baseplate are separated by an air layer; the 3dB mixed electric bridge electric feeding network is placed on the lower surface of the lower-layer medium baseplate; an internal conductor of a coaxial electric feeding unit is connected with an input port of the 3dB electric bridge electric feeding network; and an external conductor of the coaxial electric feeding unit penetrates through the lower-layer medium baseplate and is connected with the earthing unit. According to the invention, not only is the circular polarized radiation realized very well, at the same time, the circular polarized antenna has broader axial ratio beam width within the omnidirectional range, is small in volume, is low in section plane, is light in weight, is simple in structure, and is easy to be conformal.

The invention provides a low-profile low-elevation high-gain circularly polarized electromagnetic dipole antenna for satellite communication, and belongs to the field of satellite mobile communication. According to the antenna, the electric dipole radiation arms are designed into specific fan shapes, so that the impedance bandwidth of the antenna is effectively expanded; the beam width of the antenna is expanded through the parasitic magnetic dipole, and the gain at the low elevation angle is increased; meanwhile, a novel AMC structure (an artificial magnetic conductor reflecting surface) is adopted and is suitable for an electromagnetic dipole antenna, the AMC structure is compact, the design is simple, and the profile height of the antenna can be effectively reduced; and an air layer is introduced between the dielectric substrate and the AMC, so that the impedance bandwidth of the antenna is widened, and the gain of the antenna is increased. Therefore, the overall size of the antenna is 0.48[lambda]0*0.48[lambda]0*0.054[lambda]0([lambda]0 is the working wavelength at the center frequency point of the antenna), and the antenna has the characteristics of miniaturization and low profile.

The invention discloses a C-wave-band miniature broadband wide-beam circular polarization microstrip antenna. The C-wave-band miniature broadband wide-beam circular polarization microstrip antenna iscomposed of a medium cavity layer, a parasitic layer, a connection layer, a radiation layer and a feed layer which are stacked up and are attached to one another in sequence from top to bottom. Circular polarization is achieved through double-point feed, a feed network adopts an equal-amplitude Wilkinson power divider which divides one into two and has the 90-degree phase position difference. Radiation of a grounded metal column is similar to that of a monopole antenna, the radiation pattern of the grounded metal column is omni-directional, and the metal column is loaded so that the half powerbeam width of the microstrip antenna can be increased. A square ring generates a horizontal polarization electric field which is used for balancing an additional vertical polarization electric fieldof the metal column, the beam width is increased, and meanwhile the axial ratio property of the antenna is improved. By introducing the stacked-up structure of parasitic patches, the impedance bandwidth of the antenna is increased, the parasitic patches are subjected to circular arc chamfering, and the axial ratio bandwidth and 3dB axial ratio beam width of the antenna are further improved.

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.

The invention discloses a BeiDou microstrip antenna loaded with wrench type resonant rings and relates to a microstrip antenna. The BeiDou microstrip antenna is provided with a medium substrate, upper and lower surface good conductor layers and a coaxial feed structure; the upper and the lower surface good conductor layers are respective coated at upper and lower surfaces of the medium substrate; the upper surface layer is a square patch which is arranged on the middle of the medium substrate; two wrench type resonant rings are symmetrically loaded at a pair of opposite angles of the square patch; each wrench type resonant ring consists of an isosceles-right-triangle-shaped cut corner, a rectangular gap and a circular ring notch groove; the vertex of the isosceles-right-triangle-shaped cut corner is superposed with the vertexes of the selected loading opposite angles; two right-angle sides of the isosceles-right-triangle-shaped cut corner are positioned on two sides, jacked out from the vertexes,. of the square patch; one short side of the rectangular gap is superposed with the inclined side of the isosceles-right-triangle-shaped cut corner; the other short side of the rectangular seam is a chord of the outer circle of the circular ring notch groove; the circle center of the circular ring notch groove is positioned in a position, on a diagonal line of the group of the selected loading opposite angles, of the square patch; and a coaxial inner conductor in the coaxial feed structure is connected with the square patch.

The invention relates to an ultra-wideband oval slit antenna with a back cavity in the technical field of the communication. The antenna comprises a printed medium plate and a metallic reflective cavity. A metallic ground with a wide slit is arranged on one side of the medium plate, a micro-band feeding source is arranged on the other side, and tuning sheets are added to the metallic reflective cavity; wherein the wide slit is an oval slit and has a rotation angle; the micro-band feeding source is formed by a circular patch connected with a gradually-changed micro-band line; a plurality of parallel triangular tuning sheets are mounted on one side of the metallic reflective cavity, and an arc-shaped metallic bottom surface is added to the other side. The impedance bandwidth of the oval slit antenna is 3.5-9.65GHz, with the VSWR smaller than 2; the gain of each sampling frequency point is higher than 8dB; the ultra-wideband oval slit antenna has the advantages of high gain, low section and better directional diagram consistency, thereby being used in radar, locating and communication systems and on application occasions requiring high gain, ultra wideband and directional radiation.

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 multi-band MIMO cell phone antenna with a simple decoupling structure. The antenna comprises a grounding plate, a medium substrate, and two groups of multi-branch bending ring radiation chips symmetrically arranged on the medium substrate. The two groups of multi-branch bending ring radiation chips are fixedly provided at the top ends of the left edge and the right edge of the medium substrate along the edges of the medium substrate. Each group of the multi-branch bending ring radiation chips comprises two bending parts. The grounding plate is fixedly arranged at the bottom of the back face of the medium plate. The width of the grounding plate is identical to that of the medium substrate and the grounding plate is provided with two concave rectangular grooves and a protruding rectangle. The two concave rectangular grooves are symmetrical to each other with the vertical axis of the medium plate in the middle. The protruding rectangle is right in the middle of the grounding plate. According to the invention, the combination of grooves and a protruding rectangle enables the decoupling of a MIMO structure so that an antenna can meet the requirement of a cell phone on all frequency bands while ensuring the coupling is low.

The invention discloses a tri-band antenna based on CSRR and LHTL, which belongs to the technical field of multi-frequency antennas based on a metamaterial structure. The problem of universally narrow impedance bandwidth of the existing multi-frequency antenna is solved. The antenna is in an axial symmetry structure by taking the center line of a dielectric plate of the axis. A complementary split ring resonator CSRR, a left hand transmission line LHTL, a coplanar waveguide CPW, two triangle impedance matching units and two virtual floors cover the upper surface of the dielectric plate. The complementary split ring resonator CSRR structure realizes first two work bands of the antenna, and the antenna works in a dipole antenna mode. The left hand transmission line LHTL realizes a third additional work band. The coplanar waveguide CPW is connected with the complementary split ring resonator CSRR. Two triangle impedance matching units are respectively inserted into a space between the left side of the coplanar waveguide CPW and the complementary split ring resonator CSRR and a space between the right side of the coplanar waveguide CPW and the complementary split ring resonator CSRR. The tri-band antenna is applied to indoor communications.

Provided is a broadband millimeter wave antenna. The antenna comprises an upper rectangular metal block, a lower rectangular metal block, and an intermediate dielectric substrate, one sides of the upper rectangular metal block and the lower rectangular metal block are respectively provided with a metal arm in an extended manner, the two metal arms are in mirror symmetry with respect to the dielectric substrate, the distances between two opposite surfaces of the metal arms are equal, the distances between two surfaces, which are face to face, of the metal arms are gradually increased along the length direction, a V-shaped radiation opening is formed, the end of the radiation opening forms a horn-shaped mouth portion, one end, with large diameter, of the mouth portion, is arranged towards the outside of the radiation opening, the upper surface and the lower surface of the dielectric substrate are metal surfaces, the dielectric substrate is provided with a switching circuit and a substrate integrated waveguide along the length direction, the switching circuit is arranged from a microstrip line to the substrate integrated waveguide, an output end of the substrate integrated waveguide is provided with a dielectric plate in an extended manner, the width of the dielectric plate is gradually reduced along the length direction, and the dielectric plate stretches into the radiation opening. The antenna is advantaged by wide bandwidth, low cost, small size, simple and compact structure, and easy integration and array organization.

The invention discloses a broadband planar printed antenna, which comprises a dielectric substrate, wherein the front of the dielectric substrate is printed with a similar C-shaped radiating element and a floor, and the back of the dielectric substrate is printed with a reverse L-shaped radiating element and a micro-strip feed line. A vertical branch in the reverse L-shaped radiating element and a second branch of a tail end open circuit element in the similar C-shaped radiating element are partially overlapped on a mirror image projection plane vertical to the dielectric substrate, and the reverse L-shaped radiating element and the similar C-shaped radiating element form cross coupling. The broadband planar printed antenna has the advantages of simple and compact structure and easiness in processing, has a certain gain and better omnidirectional radiation characteristics, and is especially suitable for a wireless communication device of a hand-held terminal.