30results about How to "UWB" patented technology

The invention provides a one-sixteenth-wavelength ultra-low-profile dual-polarized oscillator unit and a base station antenna including the same. The dual-polarized oscillator unit comprises an oscillator assembly and a balun support part for feeding of the oscillator assembly. The oscillator assembly consists of a dielectric substrate and a radiation sheet arranged at the dielectric substrate. The radiation sheet includes two pairs of dipole antenna arms and four metal straps. The two pairs of dipole antenna arms are arranged at the front side of the dielectric substrate in a positive-negative 45-degree orthogonal manner; one end, approaching the orthogonal center, of each dipole antenna arm is a feed end; and a terminal, far away from the orthogonal center, of each dipole antenna arm is provided with a protruding branch extending to one side of the adjacent dipole antenna. The four metal straps are distributed at the back side of the dielectric substrate and are located below the adjacent dipole antenna arms respectively; the metal straps have the same projection overlapped areas at each protruding branch; and the protruding branches and the metal straps are coupled to form a current path.

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 provides a fractal ultra-wideband antenna, and belongs to the technical field of wireless communication. The fractal ultra-wideband antenna comprises a dielectric slab (3), a radiating unit (2), a feed unit (4) and a grounding unit (6), the radiating unit (2) and the feed unit (4) are printed on one face of the dielectric slab (3) and are directly communicated, and the grounding unit (6) is printed on the other face of the dielectric slab. The radiating unit (2) is formed after iteration and fractal carried out twice or more than twice and is a communicated metal patch, and seams (1) are etched on in the radiating unit; the grounding unit (6) is a trapezoid metal patch, and a rectangular groove (5) is etched in the center of the edge of the upper bottom. The antenna has the advantages that an ultra wideband is available, multi-frequency work is achieved, directionality is good, the standing-wave ratio is small and good impedance matching is achieved; the structure is simple, the size is compact, the weight is low, loss is low and requirements of plane design are met; the manufacturing cost is low, precision is high, repeatability is good and the antenna is suitable for being used for small devices and can be conveniently produced in a large scale.

The invention discloses a system for realizing indoor coverage in a CDMA network. The system comprises a main unit and at least one remote unit, wherein the main unit is used for converting one path of CDMA radio frequency electrical signal received into an optical signal and dividing the optical signal into a plurality of paths of same optical signals for output, and converting the plurality of paths of optical signals received into electrical signals respectively and combining the electrical signals into one path of electrical signal for output; and the at least one remote unit is used for converting the received optical signal into the electrical signal and filtering the electrical signal to filter out a CDMA signal, outputting the CDMA signal after power amplification, and filtering the received electrical signal to filter out and amplify the CDMA signal and converting the amplified signal into the optical signal for output. The system realizes networking of a distribution system, can be flexibly expanded, changes the mode of performing wireless signal coverage dependent on a single power device, provides powerful support and guarantee for indoor coverage construction of a mobile communication network, is energy-saving and environment-friendly, and can reduce repeated construction of a wireless network.

The invention discloses a directional dual-frequency antenna. The directional dual-frequency antenna comprises an irradiator, a microstrip Balun, a first transmission line, a second transmission line and a reflective plate, wherein the irradiator is provided with a groove, a gap and a bent part, the inner end of the gap is connected with the groove, the outer end of the gap is opened, a first edge of the bent part is connected with a first edge of the gap, and a second edge of the bent part is connected with a second edge of the gap; a first end of the first transmission line is connected with the irradiator, a second end of the first transmission line is connected with the microstrip Balun, and a first end of the second transmission line is connected with the irradiator; and the reflective plate is arranged below the irradiator, separated from the irradiator and connected with the microstrip Balun. According to the embodiment of the invention, the directional dual-frequency antenna has the advantages of ultra wide band, high gain, high front-to-back ratio, high axial cross polarization ratio, good consistency in directional diagram, small volume, simple structure, low manufacturing cost and the like, and is convenient to process.

The invention relates to an L-band and S-ban ultra-wideband high-power amplitude-limiting low-noise amplifier formed by sequentially connecting an amplitude limiting stage, a first amplifying stage and a second amplifying stage. The amplitude limiting stage is designed by adopting bare tube cores of multistage amplitude limiting PIN (positive-intrinsic-negative) tubes and is formed by sequentially connecting a first amplitude limiting PIN tube, a direct current channel inductor, a second amplitude limiting PIN tube and a third amplitude limiting PIN tube over the ground in parallel. The first amplifying stage and the second amplifying stage are the completely same in circuit structure and parameters, a low-noise field-effect transistor is selected, a lumped parameter negative feedback technical design is adopted, and the first amplifying stage and the second amplifying stage respectively comprise the low-noise field-effect transistor, an input coupling capacitor, an output coupling capacitor, a negative feedback circuit and a direct current biasing circuit. The L-band and S-ban ultra-wideband high-power amplitude-limiting low-noise amplifier disclosed by the invention has the advantages of high amplitude limiting power, ultra wideband, low noise, small volume, low cost and the like, and can meet application requirements such as L-band and S-band ultra-wideband communication, radar, electronic countermeasure and measurement.

The invention relates to a multi-signal passive intermodulation testing system. The multi-signal passive intermodulation testing system comprises a first signal source, a second signal source, a poweramplification circuit, a first signal gating circuit, a second signal gating circuit, a first diplexer, a second diplexer, a receiver and a control circuit. The first signal source generates a firstsignal and sends the first signal to a first GaN power amplification tube, the second signal source generates a second signal and sends the second signal to a second GaN power amplification tube, thefirst GaN power amplification tube carries out power amplification on the first signal and sends the amplified first signal to the first signal gating circuit, the second GaN power amplification tubecarries out power amplification on the second signal and sends the amplified second signal to the first signal gating circuit, the first signal gating circuit synthesizes the amplified first signal with the amplified second signal, and sends the synthesized signal to a device to be tested through the first diplexer; the second signal gating circuit receives an intermodulation signal generated by the device to be tested through the second diplexer, and sends the intermodulation signal to the receiver; and the control circuit obtains the intermodulation signal from the receiver and carries out atest.

The invention provides a tooth-shaped miniature ultra-wideband antenna with loaded star-shaped gaps. The antenna belongs to the field of wireless communication technology. The tooth-shaped miniature ultra-wideband antenna with the loaded star-shaped gaps is composed of a dielectric board (1), a radiating unit (2), an impedance converter (6), a 50-ohm feed line (7), a grounding unit (8), and an F-shaped paster (9), wherein the radiating unit (2), the impedance converter (6), the 50-ohm feed line are printed on the front side of the dielectric board (1), the grounding unit (8) and the F-shaped paster (9) are printed on the back surface of the dielectric board. The tooth-shaped miniature ultra-wideband antenna is characterized in that one large hexagram gap (3) and six small hexagram gaps (4)are loaded on the radiating unit (2), and furthermore 24 semi-hexagram pasters (5) are expanded from the edge of the radiating unit; and b, the grounding unit (8) is connected with the F-shaped structure paster (9). The tooth-shaped miniature ultra-wideband antenna has advantages of 1, ultra-wideband; 2, compact structure and small size; and 3, low manufacturing cost.

The invention discloses an ultra-wide-band and ultra-high-speed distance limit-free quantum communication method and belongs to the field of quantum communication. The key point of the technical scheme is that through utilization of a binary information coding principle and a quantum instantaneous transmission characteristic, a plurality of quantum entanglement pairs are sorted from high orders to low orders; quanta are separately stored in quantum state source memories of a sender and a receiver; corresponding marking is carried out; starting from the first high orders of the quantum state source memories to the low orders, one quantum with a quantum state 1 or 0 in every two adjacent, continuous and non-repeated orders is in one to one correspondence with the digital information 1 or 0 of a plurality of pieces of binary information from the high orders to the low orders; the sender operates the quantum state source memory to cause the states of the quanta to be changed; and the receiver obtains instantly collapsed entangled quantum state and/or quantum state sequence information and extracts and stores the binary information therefrom. The method is mainly applied to ultra-wide-band and ultra-high-speed distance limit-free quantum communication.

The invention discloses a terahertz metamaterial filter, which comprises n * n same units. Each unit is composed of multiple layers of high polymer materials including polymethacrylimide and polyimideand multiple metal layers, wherein the layers are aligned and repeatedly stacked in the sequence of metal-polyimide-polymethacrylimide from the incident direction of terahertz waves. Terahertz wavesenter the filter to generate electromagnetic resonance, the terahertz waves at the resonant frequency are reflected and absorbed to form a stop band, and waves at other frequencies are not hindered. With the filter provided by the invention, problems of small rectangular coefficient and narrow bandwidth in the existing filters of the same type are solved, and the filter has the advantages of flattop, insensitive polarization and low cost.

The invention discloses a broadband miniaturized dual-polarized antenna, which belongs to the technical field of communication. The broadband miniaturized dual-polarized antenna comprises four slot antennas, eight inductor wires, four downward bent metal sheets, four metallized via holes, four microstrip lines, two FR4 dielectric boards, two coaxial lines, a metal reflection board, an air bridge and a nylon column, wherein two microstrip lines are printed on the front surface of one dielectric board and are connected with the inner conductor of the coaxial line respectively, the other two microstrip lines are printed on the back surface of the other dielectric board and are connected with the outer conductor of the coaxial line respectively, and isolation through the air bridge is carriedout at the dielectric board back intersection; the tail end of the microstrip line is connected with a ground board outside the slot antenna through the metallized via hole; the four microstrip linesform two broadband differential baluns for feeding the slot antennas; the two FR4 dielectric boards are fixed through the nylon column; and the metal reflection board is placed at the lower side of the dielectric board. The working bandwidth of the antenna is effectively broadened, the size of the antenna is reduced, and high isolation and high gain stability are realized.

The invention relates to a coaxial series-parallel feed omnidirectional biconical dipole sleeve antenna, which belongs to the technical direction of antenna microwaves, consists of a biconical dipole sleeve antenna unit and a coaxial series-parallel feed network, and mainly comprises a biconical dipole, a metal sleeve and the coaxial series-parallel feed network, wherein the radiating body gradient structure of the biconical dipole antenna unit can enable the radiating body gradient structure to obtain better impedance matching with a free space; the coaxial metal sleeve outside the radiating body can further broaden the working bandwidth of the antenna unit; and the biconical dipole antenna units are in omnidirectional radiation in the horizontal direction, and a coaxial series-parallel feed network is adopted to form an array in the vertical direction, so that the high-gain performance of the antenna is achieved. The coaxial series-parallel feed network is composed of a linear gradient impedance conversion section and a two-stage coaxial power divider. The coaxial series-parallel feed network has no influence on the direction of a vertical plane directional diagram of the antenna, is simple in structure and easy to realize, and can be used as a structural support of an omnidirectional antenna.

The invention discloses a method for realizing access and distribution of a CDMA signal and in a user station area, which comprises the following steps: converting a received CDMA radio frequency electrical signal into an optical signal and dividing into a plurality of paths of same optical signals for outputting; expanding and transmitting the received optical signals; converting the received optical signals into radio frequency signals and carrying out CDMA wireless signal distribution; in the uplink direction, converting the CDMA wireless signals received by a user into optical signals for outputting; combining a plurality of the received optical signals into one path for outputting; and respectively converting the plurality of the received optical signals into electrical signals for outputting, and then combining into one path and outputting. The method of the invention realizes the networking of the distribution system, can flexibly expand, changes the mode of utilizing a single power device to carry out CDMA wireless signal coverage, provides powerful support and guarantee for the indoor coverage construction of a CDMA mobile communication network, saves energy, is environment-friendly, and can reduce the repeated construction of wireless construction.