9results about How to "Reduce mutual coupling" patented technology

The invention provides an antenna assembly and electronic equipment, and relates to the field of communication. The antenna assembly comprises a middle frame which comprises a substrate, a frame and rib positions, and the frame is connected with the edge of the substrate through the rib positions; the first antenna is arranged on the frame; the second antenna is arranged on the frame, and the rib position is located between the first antenna and the second antenna; and one end of the first feeder line is used for being electrically connected with the circuit board, and the other end of the first feeder line penetrates through the rib position and is electrically connected with the feeding point of the second antenna. The rib position is arranged between the first antenna and the second antenna, and the rib position can increase the distance between the first antenna and the second antenna, so that the isolation degree between the first antenna and the second antenna is increased. And the first feeder line is not arranged on the substrate of the middle frame, and the position of the first feeder line is closer to the frame, so that the space occupied by the first feeder line is reduced, the internal structure of the electronic equipment is more compact, and a screen with a larger display area can be conveniently arranged.

The application relates to a satellite communication hetero-frequency hetero-circular polarization common-aperture antenna, belonging to the radio frequency communication field, which comprises a dielectric plate assembly, an antenna radiation unit assembly and a SIW feeding structure assembly; the dielectric plate assembly comprises three layers of dielectric plates and provides support for the whole antenna; the antenna radiation unit assembly comprises one low-frequency antenna radiation unit and four high-frequency antenna radiation units, the low-frequency antenna radiation unit is arranged in the middle of the four high-frequency antenna radiation units, and the four high-frequency antenna radiation units adopt a rotating layout; the SIW feeding structure assembly is used for feeding the low-frequency antenna radiation unit and the high-frequency antenna radiation unit. The application can guarantee the normal work of the high-frequency and low-frequency antenna radiation units in the working frequency bands, and present filtering characteristics in the non-working frequency bands, so that the port isolation between the antenna units of different frequency bands is improved. The filtering effect of the SIW feeding cavity can be adjusted by changing the size of the SIW feeding cavity.

The invention discloses a terahertz defect detection device based on a multiple-input-multiple-output array, and relates to the technical field of testing. The device comprises a portal frame, a transmission table, a defect detection array front end, a microwave signal generation module and a data acquisition and control module, the defect detection array front end is fixed on the portal frame, is connected with the microwave signal generation module and is used for detecting defects of a sample to be detected, and the data acquisition and control module is connected with the transmission table. Comprising a terahertz signal generating array, a terahertz signal receiving array and a transmitting and receiving antenna module, and array elements in the terahertz signal generating array and the terahertz signal receiving array are arranged at equal intervals in a staggered mode; the transmission table is positioned below the front end of the defect detection array and is used for placing a sample to be detected, and the portal frame, the transmission table, the front end of the defect detection array and the microwave signal generation module are respectively connected with the data acquisition and control module. The device disclosed by the invention is high in integration level, high in stability and high in imaging efficiency, and realizes rapid, efficient and nondestructive detection on the defects of the non-metallic material.

The invention provides an ultra-wideband millimeter wave antenna, which belongs to the field of microwave technology and antenna engineering and comprises a horn radiation cavity, a parasitic patch layer, a radiation patch layer and a feed layer which are sequentially stacked from top to bottom, the metalized via hole arrays in the parasitic patch layer, the radiation patch layer and the feed layer respectively define a first cavity, a second cavity and a third cavity; the horn radiation cavity coincides with the central axes of the first cavity, the second cavity and the third cavity. The parasitic patch is arranged on the upper surface of the parasitic patch layer and is positioned right above the center of the first cavity; the radiation patch is arranged on the upper surface of the radiation patch layer and is positioned right above the center of the second cavity; the metal grounding plate is arranged on the lower surface of the feed layer; the band-ground coplanar waveguide transmission line is arranged on the upper surface of the feed layer and is connected to one end of the strip-shaped feed line through the metalized feed via hole, and the other end of the strip-shaped feed line is connected to the radiation patch; an antenna array is also provided. And dual improvement of bandwidth and gain of the millimeter wave antenna is realized.

This invention provides a decoupling structure for a millimeter-wave circularly polarized antenna array and a wireless communication device. The decoupling structure is used to resonate and decouple the millimeter-wave circularly polarized antenna array. The decoupling structure comprises, from top to bottom, an upper decoupling dielectric substrate and a lower decoupling dielectric substrate. An upper metal decoupling structure is disposed on the upper surface of the upper decoupling dielectric substrate, and a lower metal decoupling structure is disposed on the upper surface of the lower decoupling dielectric substrate. The upper metal decoupling structure includes a transverse main trunk and several longitudinal branches; the lower metal decoupling structure includes several longitudinal metal branches, with the lengths of the transverse main trunk, longitudinal branches, and longitudinal metal branches decreasing sequentially. Millimeter-wave circularly polarized antenna arrays are spaced apart at the bottom of the lower decoupling dielectric substrate to form a wireless communication device. The resonant decoupling structure of this invention suppresses port coupling between antenna elements while expanding impedance bandwidth and bandwidth.

The invention discloses an underwater target detection and positioning method and system based on a passive sonar array, and relates to the technical field of underwater acoustic signal processing. Acoustic signals radiated by an underwater target are received and divided into dense subarray data and sparse subarray data; performing a sparse Bayesian learning algorithm on the sparse subarray data, and outputting a high-precision fuzzy value; carrying out azimuth estimation on the dense subarray data in a full-angle range through a dense part to obtain a low-precision unambiguous value; and fusing the high-precision fuzzy value and the low-precision non-fuzzy value through an estimation matching model to obtain an orientation estimation result of the underwater target. According to the method, high-precision azimuth estimation is carried out based on the combination of the ternary co-prime array and the compressed grid sparse Bayesian learning, high-precision (but fuzzy) estimation is carried out by utilizing the sparse part of the TCA array, low-precision (but non-fuzzy) estimation is carried out by utilizing the dense part, and high-precision target azimuth estimation under low operand is realized.

The application discloses an integrated Bluetooth and ultra-wideband antenna structure for communication and accurate positioning, which is designed for simultaneously realizing the Bluetooth and the ultra-wideband antenna in a narrow space, fully utilizes the wavelength characteristics corresponding to the Bluetooth frequency band and the ultra-wideband frequency band, takes the ultra-wideband antenna radiator with shorter wavelength as the excitation source of the Bluetooth antenna radiator in the form of near-field coupling, and excites the Bluetooth radiator. In the working mode, the ultra-wideband radiator and the antenna reference ground form a non-dipole working mode, and the Bluetooth radiator is coupled and excited to be in a dipole working mode, so that the mutual interference between the two radiators is minimized, and the mutual interference between the two antenna frequency bands is reduced to the maximum extent.

This invention discloses a decoupling structure for a dual-polarized MIMO antenna, applied to a four-element MIMO antenna. It includes six dielectric substrates: S1, S2, S3, S4, S5, and S6. Metal structure P4 is attached to substrate S1, metal structure P3 to substrate S2, metal structure P2 to substrate S4, and metal structure P1 to substrate S6. S7 is a cross dielectric substrate, vertically placed directly below the antenna element. A U-shaped feed line P5 is attached to the back of S7, and a rectangular metal sheet P6 is attached to the front. S8 is another cross dielectric substrate, vertically placed between adjacent isolation wall dielectric substrates S9, with a U-shaped metal ring P7 attached to its back. S9 is a metal isolation wall surrounding the cross dielectric substrate S7. M is a metal reflector. The advantages of this invention lie in its innovative decoupling structure and the achievement of high isolation within a wide bandwidth while maintaining a relatively small antenna element spacing.

A phased array radar antenna disclosed by the present invention comprises an antenna reflecting plate, a reflecting plate lining plate, a radio frequency connector, a power dividing feed unit, a sum-difference device module and a radiation array unit, the reflecting plate lining plate is arranged on a first mounting surface of the antenna reflecting plate, the radio frequency connector is arranged on a second mounting surface of the antenna reflecting plate, and the power dividing feed unit is arranged on the second mounting surface of the antenna reflecting plate. The power division feed unit is arranged on the reflecting plate lining plate, the radiation array unit comprises a left radiation array and a right radiation array which are symmetrical in structure and are independently arranged, and each of the left radiation array and the right radiation array comprises a plurality of columns of sub-arrays arranged in the horizontal direction; each column of sub-arrays is composed of a plurality of array element radiation units which are arranged along the vertical direction; and the plurality of array element radiation units in each column of sub-arrays all adopt an integrated structure and are coupled and connected with the sum-difference device module through the power division feed unit. According to the antenna, the gain, the beam pointing precision and the anti-interference capability of the antenna in the C wave band are improved.