34results about How to "Solve mutual coupling" patented technology

The invention discloses a dual-polarization radiating unit and an array antenna provided with the dual-polarization radiating unit, the main technical problem to be solved is the problem of mutual coupling between arrays in the prior art. The dual-polarization radiating element includes a radiation device, which comprises array arms arranged symmetrically on a first PCB substrate, and the array arms are connected with a decoupling circuit by a direct feed mode or a coupling mode. The technical scheme that the effective length of the decoupling circuit is 0.02 to 0.1 wavelength solves the problem well and can be used for an array antenna.

The invention discloses an interference coherent robust beam forming method of unknown mutual coupling information under a mutual coupling condition, and belongs to the beam forming technology in the field of adaptive array signal processing. According to the interference coherent robust beam forming method disclosed by the invention, based on the particularity of an array mutual coupling structure, when the specific array mutual coupling information is unknown, an interference plus noise covariance matrix and an expected signal covariance matrix are separately constructed, and a final weight vector is figured out by using the maximum signal-to-noise criterion. According to the interference coherent robust beam forming method disclosed by the invention, the mutual coupling information does not need to be known in advance, an expected signal guide vector does not need to be estimated, and no spatial smoothing decoherence processing needs to be carried out. When the expected signal power is strong and weak, very good performance is kept, and fast convergence can be realized.

The invention provides a shipborne overwater wireless communication monitoring system, which comprises a shipborne correlation interferometer direction-finding antenna array, an electrical rotation unit, an RF amplifier module, a card direction finding receiver, a direction-finding control processing module, an embedded computer system and a power supply module. The system has the advantages that an integrated design, the intermediate frequency signal technique and the modularized combination are adopted; the built-in embedded computer system is adopted, so that the structure is compact and portable; the portable passive correlation interferometer direction-finding antenna is adopted to solve the mutual coupling between the antenna array cells to eliminate the coupling and the phase ambiguity between element antennae; the multifunctional amplifier is adopted and automatically switched to enlarge the dynamic application range of the received signal; the card double-channel monitoring direction-finding receiver is equipped, so as to carry out the monitoring and the direction-finding by a sharing time, and switched into the radio monitoring without the need of the direction-finding; and the compensation algorithm software is corrected and combined with an electronic nautical chart and a ship recognition system to meet the requirements for the overwater/offshore monitoring.

The invention relates to the technical field of communication, and discloses a low-frequency radiation unit and an antenna. The low-frequency radiation unit comprises a bottom plate, a supporting plate with one end disposed on the bottom plate, and a radiation plate disposed at the other end of the supporting plate. The radiation plate comprises two oscillator arms which are crossed up and down and are perpendicular to each other, each oscillator arm comprises a first radiation arm and a second radiation arm, the first radiation arm is provided with a plurality of spiral groove structures, and the second radiation arm and the first radiation arm are in rotational symmetry. According to the low-frequency radiation unit and the antenna provided by the invention, the spiral groove structures are additionally arranged on the oscillator arms to form the band-stop filter circuit so that the low-frequency radiation unit has a high-frequency filtering function, the problem of mutual coupling between the high-frequency radiation unit and the low-frequency radiation unit in an antenna array is effectively solved, and the interference of the low-frequency radiation unit on the high-frequency radiation unit is reduced; and the multi-frequency and integrated design of the antenna is facilitated.

The invention discloses a single-channel array transmitting antenna based on frequency pre-coding. The antenna mainly solves the problems that a conventional array transmitting antenna structure is complicated in structure, large in size and high in price and amplitude phases are different due to multiple channels. The antenna comprises a waveform generator (1), a frequency modulator (2), a digital-to-analog converter (3), an upper converter (4), a low-noise amplifier (5), a frequency tracker (6) and an antenna oscillator (7). Multipath signals generated by the waveform generator are modulated and aggregated to form a single-channel signal through the frequency modulator, the signal sequentially undergoes formal transformation achieved through the digital-to-analog convert, frequency mixing achieving through the up-converter and amplification achieved through the low-noise amplifier and then an analog radio-frequency signal is obtained. The analog radio-frequency signal outputs a multichannel signal through orthogonal demodulation and filtering of the frequency tracker, and the multichannel signal is transmitted after formal transformation is carried out in an antenna oscillator signal mode. The antenna is simple in structure, small in size, low in cost, good in antenna amplitude phase uniformity and capable of reaching the same performance index as a conventional array transmitting antenna.

The invention discloses an antenna decoupling structure and method based on a metamaterial and a soft surface. In the structure, an antenna structure is used for radiating or receiving space electromagnetic waves outwards; the top layer and the bottom layer of the metamaterial unit structure are the same split-ring resonator metal patterns, the middle layer is a medium FR4, and the structure enables the metamaterial unit structure to have negative medium parameter characteristics in a specific working frequency band and is used for inhibiting electromagnetic wave propagation between antenna structures; the band elimination characteristic is further improved by utilizing the blocking effect of the soft surface on electromagnetic waves; a metamaterial unit structure and a soft surface structure are combined and loaded between antenna structures, so that an isolation effect in a wide working frequency band is realized. According to the invention, the problem of antenna mutual coupling caused by space direct waves between antennas is solved, and the antenna can be applied to a phased-array antenna and a high-coupling MIMO (Multiple Input Multiple Output) array; the decoupling structure is simple in basic principle and clear in scheme, the designed decoupling structure is wide in working frequency band range and obvious in decoupling effect, and the decoupling structure has high application value.

The invention discloses a partially polarized signal multi-parameter estimation method based on a non-co-located non-uniform polarized array. The method comprises the following steps of: arranging a non-co-located non-uniform polarization array; constructing a partially polarized signal receiving model and sampling; solving an array sample covariance matrix and error statistical distribution of the array sample covariance matrix; constructing an optimization problem used for reconstructing a co-located uniform polarization array theoretical covariance matrix and solving the optimization problem; estimating a signal incoming wave direction based on a reconstructed co-located uniform polarization array theory covariance matrix; and solving a signal coherence matrix and estimating a signal polarization parameter. According to the method, the array adopts a non-co-location mode, and the phase centers of the polarization units are not overlapped, so that on one hand, the problem of mutual coupling between co-location array polarization units is avoided; and on the other hand, each array element only has one radio frequency channel, so that resources are saved. Then, the array adopts a non-uniform mode, so that the limitation of a uniform array on the aperture of the array is eliminated, and the estimation of the direction of arrival is ensured not to be fuzzy;

The related dual-polarized multi-channel digital radio monitor and interferometer direction- finding mobile station system comprises: a direction-finding antenna for vertical/horizontal polarized interferometer, a vertical/horizontal polarized monitor antenna, two electric switch units, a RF amplifiers, three selectors, two three-functional RF amplifiers, a three-channel receiver, a PC, a processor, a self-correction signal generator, a router, a position indicator, a GPS, an electron compass, a inversion power, a printer, and the network. This invention has well sensitivity and fast speed, and fit to wide application, such as FFT digital monitor.

The invention relates to a nine-channel space spectrum super-resolution estimation monitoring and direction-finding mobile station system, which comprises a small double-cone omnidirectional monitoring antenna, a nine-unit direction-finding antenna, an amplifier, a monopole monitoring antenna, a nine-channel signal switching module, a filter combiner, am amplifier module, a nine-channel receiver, a monitoring and direction-finding controller, a DSP (Digital Signal Processor) processing module, an imbedded industrial computer, a GPS (Global Positioning System) antenna, a GPS module, a 3G (3rd Generation) antenna, a 3G router, a power supply module, a remote control unit, an exchanger, and the like. The system has the following advantages: the system achieves remote and automatic monitoring and direction-finding of radio signals; an imbedded computer system is integrally arranged so that the structure is compact and light; a direction-dinging assembly solves the coupling problem between the antenna arrays and prevents coupling and phase between unit antennas from being blurred; the structure is compact and light, and the spanning maintenance is convenient; the grid connection is flexible, and can support different wired/wireless network data transmissions; moreover, collection, compression coding, automatic task monitoring, statistic analysis and abnormal state alarm of wireless signals are realized.

A satellite-navigation anti-interference microstrip array antenna provided in the invention adopts triangular Y-shaped slot microstrip array elements. By using the antenna, miniaturization of the antenna array can be realized, cross coupling among array elements is effectively overcome and an anti-interference capability is increased. The antenna comprises N microstrip antenna array elements, a medium substrate and a metal reflection base plate. The microstrip antenna array elements are arranged on an upper surface of the medium substrate according to a certain interval. The metal reflection base plate is arranged on a lower surface of the medium substrate. Each microstrip antenna array element comprises a triangle metal radiant panel. The triangle metal radiant panel is provided with a Y-shaped slot. The Y-shaped slot comprises three bar-type slotting. Initiating terminals of the three bar-type slotting are intersected and converged and tail terminals are pointed to three edges of a triangle respectively. The triangular Y-shaped slot microstrip array elements are used for controlling flowing of a surface current and radiating a circular polarized wave. An edge of each bar-type slotting of the Y-shaped slot is provided with a coaxial feed point used for feeding in an electromagnetic wave signal.

The present invention provides a decoupling device. The decoupling device is disposed between two antennas and comprises a coupling unit and a tunable unit; the coupling unit comprises a horizontal branch and a vertical branch; the intermediate point of the horizontal branch is connected with one end of the vertical branch; the other end of the vertical branch is grounded; and the tunable unit is disposed on the coupling unit and is use for changing the electrical length of the horizontal branch of the coupling unit. With the decoupling device provided by the present invention adopted, the problem of mutual coupling between the multi-band antennas can be solved, a plurality of frequency bands can be decoupled, and the performance of the antennas can be improved.

The present invention relates to a nuclear quadrupole resonance-based antenna part of an explosive and drug detection system. The antenna part comprises an emission antenna and a reception antenna which surround a channel of the detection system, the emission antenna is mainly composed of two emission coils which are coaxial and parallel, have the equal shapes and form a HeImholtz coil, the magnetic field intensity in the HeImholtz coil is uniform, and the coaxial distance of the two emission coils forming the HeImholtz coil is decided by the sizes of the emission coils. The emission antenna also comprises at least one conductive coil which is coaxial and parallel and has the equal shape with the two emission coils separately, so that every two adjacent emission coils or conductive coils form the same HeImholtz coils separately to prolong the length of the uniform magnetic field in the emission antenna. The reception antenna comprises at least one reception coil located between the emission antennas. The effects of the present invention are that the magnetic field intensity in the detection channel is uniform while the length of the detection channel is prolonged, and a nuclear quadrupole technology can detect the explosives and drugs normally.

This invention relates to a movable dual channel radio monitor and related interference direction finding system including a movable vertical polarized related interferometer direction finding antenna array, high and low ends rotation switches, an antenna selector, a three-function RF amplifier, a dual channel monitor direction receiver, a monitor direction controller, an industrial control computer, a low end vertical polarized monitor antenna, a high end vertical polarized monitor antenna, a monitor/direction finding selector, a GPS, an electronic compass, an UPS, an environment moinitor and remote control supply unit and a concentrator, which is advantaged that the mutual couple and fuzzy phase among antenna arrays are overcome by applying large aperture active/passive movable direction finding antenna array, and a pair of antenna elements sample at the same time so as to secure synchronous, quick and accurate and the system has three functions of amplification, direct pass and attenuation.