107 results about "Dipole radiation" patented technology

A utility meter has an internal antenna for transmitting data. The antenna is positioned between the radome of the utility meter and its front surface. The antenna comprises dipole radiator that is generally curved to the shape of the meter housing. The dipole radiator comprises a dielectric substrate carrying two asymmetric curved radiating metallic sheets, each forming a portion of the dipole, which combined extend about 135° of the circumference of the utility meter. A balun feed is connected to the metallic sheets and a transmission line is coupled to a transmitter.

The invention discloses a UWB (ultra wide band) array antenna, and mainly solves a problem that the bandwidth of a conventional array antenna is limited by the bandwidth of an antenna unit. The antenna comprises a dipole antenna array plate (1), a resistor-type frequency selection surface plate (2), a grounding plate (3) and a feed Balun (4). The antenna array plate consists of a plurality of dipole radiation periodic units, and each dipole radiation periodic unit comprises a dipole arm (111), a metal via hole (112) and a dielectric plate (113), wherein the dipole arms (111) are arranged on the upper and lower surfaces of the antenna array plate in a cross manner. The resistor-type frequency selection surface unit consists of a resistor paster and a dielectric plate, wherein the resistor paster consists of a square ring paster, a circular ring, and a rhombus paster. Through the close coupling between units, the reflection coefficient of the antenna at the band from 0.63GHz to 4.6GHz is less than or equal to -6dB, and the array bandwidth can be increased to 7.3 frequency multiplications. The antenna is used for FOPEN radars and through-the-wall imaging radars.

A microelectromechanical switch (MEMS) beam-steering antenna array is provided. The antenna comprises an active element including a selectively connectable MEMS, and a lattice of beam-forming parasitic elements, each including a selectively connectable MEMS, proximate to the active element. In some aspects, the active element is a dipole radiator having an effective quarter-wavelength odd multiple length at a first plurality of frequencies in response to connecting radiator MEMS. Likewise, the dipole counterpoise has an effective quarter-wavelength odd multiple length at the first plurality of frequencies in response to connecting counterpoise MEMS. Further, each parasitic element has an effective half-wavelength odd multiple length at the first plurality of frequencies in response to connecting their corresponding MEMS. In other aspects, the active element is a monopole and includes a radiator with a radiator MEMS, a counterpoise groundplane, and parasitic elements with MEMSs.

The invention discloses a broadband dual-polarized antenna radiation unit and an antenna using the radiation unit. The radiation unit is arranged on a metal reflector plate to form the antenna and comprises two pairs of dipole radiation units and Baluns corresponding to dipole radiation units; the two pairs of dipoles are in orthogonal polarization arrangement; each dipole comprises two unit arms which are fixedly arranged on a Balun symmetrically; the two unit arms are linear and are symmetrical about the Balun; one end of each unit arm is fixed to the Balun; the two pairs of the dipoles are positioned on the same plane; the other end of each unit arm is bent inwards; and the inwards bent part forms a loading section. Compared with the downwards bent loading section of a broadband dual-polarized antenna radiation unit of the conventional radiation unit, a dual-broadband antenna array can effectively reduce an effect of a broadband dual-polarized antenna radiation unit on a near high frequency band unit, and can more reasonably ensure the independence of various electrical properties of each frequency band in the design of a multi-frequency base station antenna.

The invention provides a novel ultra-wideband tight coupling array, comprising a first matching layer, a second matching layer, an antenna array board, a frequency selection surface board and a feeding balun array. The antenna array board is positioned directly above the frequency selection surface board. The antenna array plate comprises a plurality of dipole radiation periodic units, each dipoleradiation periodic unit comprises a dipole arm, a coupling metal patch and an antenna dielectric plate; The frequency selective surface plate includes a plurality of frequency selective surface units, the dipole arm is composed of two first metal patches, the coupling metal patch includes two second metal patches, and each frequency selective surface unit is composed of two four-fold circular ring patches, a hexagonal star gap patch and two layers of frequency selective surface dielectric plates. A frequency selective surface is used to eliminate short-circuit points, the VSWR is less than 3in the frequency range of 1.14 GHz to 11.2 GHz, and the array bandwidth can be increased to 9.8 octaves, which can be used in communication and satellite tracking radar systems.

The invention discloses a circular polarization crossed dipole antenna and a manufacturing method of the circular polarization crossed dipole antenna. The circular polarization crossed dipole antenna comprises a metal reflection board, a medium substrate located above the metal reflection board, crossed dipole radiation units arranged on the upper surface and the lower surface of the medium substrate respectively, and a coaxial feed unit connected with the crossed dipole radiation units. The crossed dipole radiation units comprise an upper dipole and a lower dipole which are arranged on the upper surface and the lower surface of the medium substrate respectively. The coaxial feed unit comprises an inner conductor and an outer conductor. The inner conductor penetrates through the metal reflection board and the medium substrate to be connected with the upper dipole. The outer conductor penetrates through the metal reflection board to be connected with the lower dipole. The crossed dipole antenna is led to a micro-strip patch, so that the circular polarization crossed dipole antenna not only has the advantages that a micro-strip antenna is small in size, light in weight, conformal with an application platform easily and easy to integrate, but also has the advantages of the wide impedance bandwidth, the circular polarization bandwidth, high gains and low manufacturing cost.

A mobile antenna includes a center-fed, broadband, dipole radiator, and a coupler assembly for mounting the dipole radiator to a mount. A power matching circuit is connected between the dipole radiator and the coupler assembly to maintain an effective balance of current distribution and impedance in conductive elements of the antenna.

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 present invention relates to an omnidirectional antenna for a mobile communication service, comprising: a plurality of radiation elements disposed on a horizontal surface with a mutually same angle so as to respectively radiate beams; and a power supply unit for distributing and providing a power supply signal to each of the plurality of radiation elements, wherein each of the plurality of radiation elements has a structure in which a horizontal polarization dipole radiation unit having two radiation arms is coupled to a vertical polarization dipole radiation unit having two radiation arms.

The invention provides a reconfigurable tightly-coupled wideband array antenna used for solving the technical problem of array antenna bandwidth limitation. The reconfigurable tightly-coupled widebandarray antenna comprises a dielectric wide-angle matching plate, a metal ground plate and M dipole antenna plates, the dielectric wide-angle matching plate and the metal ground plate are in vertical parallel arrangement, and the dipole antenna plates are in periodic arrangement and vertically fixed between the dielectric wide-angle matching plate and the metal ground plate. Each dipole antenna plate comprises a dielectric plate and N dipole radiation units in periodic arrangement. Antenna arms of every two adjacent dipole radiation units are overlapped, and each antenna arm comprises a front arm and a rear arm, wherein in every two adjacent dipole radiation units, one front arm is connected with a ground wire of a balance converter while the other front arm is connected with a core wire ofthe balance converter, the core wire of the balance converter is connected with an antenna connector fixed to the metal ground plate, and the two rear arms are connected with the metal ground plate through short-circuit balance stubs. Switches are connected between the front arms and the rear arms of every two adjacent antenna arms and between the ground wire of the balance converter and the twoshort-circuit balance stubs respectively, and through on and off of the switches, switching between a tight coupling mode and a conventional mode is realized, and full coverage of S/C/X/Ku frequency bands is realized.

A two-dimensional dual-frequency antenna array includes a plurality of dual-frequency antenna array elements configured to receive signals having first and second frequencies. The array elements of the two-dimensional antenna array may be structured to have half-wave dipole resonances—both at the mid-frequency of the two beams, merged to form the interference field, and also at the difference frequency, down converted from the first and second frequencies. Each individual dual-frequency antenna of the two-dimensional antenna array includes a plurality of dipole antennas, array elements, a plurality of nonlinear resonant circuits. The nonlinear resonant circuits interconnect the dipole antennas and are configured to permit re-radiation of signals having the third (difference) frequency in the form of resonant dipole radiation (resonant at the difference frequency).

A miniaturized folded-dipole antenna with an enatiomorph used for a radio frequency identification device (RFID) system relates to a folded-dipole antenna and provides a miniaturized folded-dipole antenna with an enatiomorph used for the RFID system that is of small size, large bandwidth, and lower return loss and provided with omni-directional radiation characteristic. A medium substrate with one side covered with copper is arranged; the copper covered area of the medium substrate is provided with a metallic dipole radiation patch and a mirror image compensation patch; the metallic dipole radiation patch is provided with a straight-arm and two fold-arms, the two fold-arms are of the same size and being symmetrically located at the two ends of the straight-arm; an opened clearance is arranged on the horizontal center line of the straight-arm and is located on the center line of the straight-arm; the mirror image compensation patch and the metallic dipole radiation patch are of the same structure and size and are arranged symmetrically.

The invention discloses a digital coding holographic antenna and a regulation and control method thereof. The device comprises a control circuit and a radial waveguide, and the radial waveguide comprises a top metal plate and a bottom metal plate. A dipole radiation unit is loaded on the upper surface of the top metal plate; metamaterial absorption boundaries are loaded on the periphery of the radial waveguide, the radial waveguide, the top metal plate and the bottom metal plate form a cavity, the bottom metal plate is provided with a coaxial feed structure, the dipole radiation unit is a dipole unit array, each dipole unit is loaded with a radio frequency switch, and the radio frequency switches are connected with a control circuit.

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 broadband wide-beam dual-polarized antenna unit, which comprises two sets of polarized orthogonal dipole radiation units, wherein each set of dipole radiation units comprise a pair of central symmetrically arranged U-shaped radiating arms which are both arranged on a corresponding balancer. By changing the traditional design concept, the original linear, fan-shaped or square radiating arms are replaced by the U-shaped radiating arms, therefore flexibly adjusting the main lobe semi-power angle of the antenna by adjusting the U-shaped width, so as to obtain higher directivity of the radiation units under the same semi-power angle and provide good foundation for realizing broadband wide-beam base station antenna.