1394 results about "Microstrip" patented technology

The invention relates to the technical field of integrated circuit testing, in particular to a distance-adjustable probe connector device which comprises an impedance detection unit which comprises a connector fixing part, a connector rotating part, a single connection port, a signal probe and a grounding probe. The impedance data unit is used for determining a characteristic impedance value of the tested microstrip line based on data acquired by the signal probe and the grounding probe; the pressure detection unit is used for determining the contact pressure according to the telescopic displacement of the signal probe and the grounding probe; the control unit determines the allowable range of the contact pressure of the probes based on the line width of the microstrip line to be tested and the distance between the probes, and adjusts the angle between the grounding probe and the surface of the PCB based on the contact pressure difference between the signal probe and the grounding probe and the line width of the microstrip line. And adjusting the contact pressure of the signal probe to obtain the effective characteristic impedance value of the tested microstrip line. According to the invention, the angle and pressure of the grounding probe are intelligently adjusted, and the problem of impedance measurement drift caused by pressure imbalance of double probes is eliminated.

The invention relates to the technical field of quantum sensing and ocean detection, and discloses an ocean magnetic field sensor based on an NV color center and an ocean magnetic field measuring method.The sensor comprises a cylindrical pressure-resistant cabin, an optical platform arranged in the pressure-resistant cabin and a main control panel; a laser, a beam shaping unit, a dichroscope, a beam shaping lens group, an objective lens, a diamond NV color center chip, a plano-convex lens I, a band-pass filter and a photoelectric detector are mounted on the optical platform; two microstrip loop antennas are mounted on the outer side of the diamond NV color center chip; an FPGA + ARM dual-core processor, a digital lock-in amplifier and two microwave signal generators are installed on the main control board, and the microwave signal generators are connected with the microstrip loop antenna and achieve electromagnetic coupling with the diamond NV color center chip. The invention has the advantages of high sensitivity, good long-term stability and strong anti-interference capability, and provides a new generation of quantum sensing solution for applications such as ocean geomagnetic monitoring and underwater target identification.

The invention discloses a metasurface filtering antenna with high out-of-band rejection. The metasurface filtering antenna comprises a first dielectric substrate, a bonding layer and a second dielectric substrate which are sequentially arranged from top to bottom, wherein the central position of the upper surface of the first dielectric substrate is provided with a metasurface structure, the metasurface structure comprises four same rectangular metal patches, and the four rectangular metal patches are arranged in a 2 * 2 array; the upper surface of the second dielectric substrate is of a defected ground structure, and a rectangular gap and four U-shaped grooves are etched in the center of the defected ground structure, wherein the four U-shaped grooves are symmetrically formed in the two sides of the rectangular gap at equal intervals; the lower surface of the second dielectric substrate is a feed structure, and the feed structure comprises a microstrip line and an I-shaped branch strip connected with the microstrip line; the first dielectric substrate and the second dielectric substrate are connected through a bonding layer. The metasurface filtering antenna can achieve good filtering and radiation performance in a millimeter wave frequency band, and meanwhile is simple in structure and low in machining difficulty, thereby being beneficial to achieving miniaturization design of a millimeter wave system.

The embodiment of the invention provides a microresonator and a preparation method of the microresonator, the microresonator can be obtained by connecting an MIM plate capacitor and an inductor of a planar coil structure, and an upper electrode, a lower electrode and the inductor of the MIM plate capacitor and a microstrip line connecting the capacitor and the inductor are all prepared from superconducting materials. A dielectric layer of the MIM plate capacitor can be prepared by adopting an ALD technology, a dielectric film grown by adopting the ALD technology is very compact and has very good thickness uniformity, a relatively high dielectric constant can be realized, and the quality factor of the microresonator can be remarkably improved by combining the zero resistance characteristic of a superconducting material; and the miniaturization of the microresonator can be realized. Moreover, in the preparation process, the three layers of thin films for forming the capacitor and the inductor are formed through deposition firstly, and then the three layers of thin films are patterned layer by layer, so that introduction of excessive impurities can be avoided, interlayer contact can be optimized, and the risk of electric leakage can be reduced.

The invention discloses a differential signal transmission link, a high-speed differential signal transmission composite chip and an intra-core differential signal transmission link configuration method. A strip line is arranged in a perforated cylinder in a penetrating manner, two differential microstrip lines are horizontally arranged at two ends of the perforated cylinder, one end of one differential microstrip line is connected with the upper end of the strip line, and one end of the other differential microstrip line is connected with the lower end of the strip line; the conductor strip and the two grounding strips in each differential microstrip line are arranged on the total slide glass side by side in the length direction of the total slide glass, the conductor strip is arranged between the two grounding strips, and the multiple capacitors and the multiple inductors are alternately arranged on the conductor strip in the length direction of one side of the conductor strip. The plurality of conductive blocks are uniformly arranged on the conductor belt along the length direction of the other side of the conductor belt; a high-bandwidth storage chip and a GPU chip in the high-speed differential signal transmission composite chip are horizontally arranged on a PCB composite board in parallel, and a differential signal transmission system is arranged among the PCB composite board, the high-bandwidth storage chip and the GPU chip in a penetrating mode.

The invention discloses a broadband single-pole double-throw switch MMIC, and belongs to the field of radio frequency / microwave. The switch adopts a symmetrical dual-channel structure, each channel comprises an input end series switch circuit, an output end series switch circuit and two parallel switch branches, channel switching is realized through two complementary control voltages, and impedance matching is carried out between the circuits by adopting microstrip lines. According to the technical scheme, switching tubes, resistors and inductors are utilized to form a circuit network, and a signal transmission path is optimized through the resonance effect of the inductors and switching tube cut-off capacitors in parallel branches in combination with a resistor parallel structure and a microstrip line matching technology. According to the invention, the performance of low insertion loss and high isolation in a broadband is achieved, the voltage standing wave ratio of an off-state output port is reduced, the port matching capability is improved, and an efficient and stable solution is provided for signal routing in a radio frequency system.

The invention discloses an antenna unit radiator, a circularly polarized phased-array antenna unit and an antenna array, and belongs to the technical field of antennas. The circularly polarized phased-array antenna unit comprises an antenna unit radiator, a first dielectric layer, a metal patch, a second dielectric layer, a third dielectric layer and a metal ground layer which are arranged in sequence; two L-shaped microstrip probes which are orthogonally arranged are laid on the top of the third dielectric layer; the third dielectric layer is internally provided with feed metal columns in one-to-one correspondence with the L-shaped microstrip probes, the top ends of the feed metal columns are connected with the corresponding L-shaped microstrip probes, and the bottom ends of the feed metal columns are provided with feed ports. The antenna array is formed by the antenna unit array. The working bandwidth of the antenna can be expanded, the defect of the narrow-band characteristic of the microstrip antenna is overcome, the degree of freedom of design of the phased-array antenna is improved, impedance matching is facilitated, and the circular polarization performance of the phased-array antenna array is greatly improved.

The invention provides a fixed-frequency beam scanning leaky-wave antenna and electronic equipment. The leaky-wave antenna comprises a first microstrip line and a second microstrip line, wherein the first microstrip line and the second microstrip line are used for transmitting radio frequency signals and are arranged at an interval; the N antenna units are connected to the first microstrip line and the second microstrip line, and each antenna unit comprises a first switch and a second switch; a first stub and a second stub, and an antenna. According to the technical scheme, the leaky-wave antenna is simple in structure, easy to process, high in expansibility and capable of reducing parasitism, transmission loss, element loss and the like.

The application discloses a double-resonance atomic clock ultra-miniature substrate integrated waveguide chamber, comprising: a substrate integrated waveguide annular gap cavity, the substrate integrated waveguide annular gap cavity is formed by longitudinal stacking of a plurality of longitudinal slit substrate integrated waveguides, the longitudinal slit substrate integrated waveguide comprises a metalized through hole and a metal microstrip line, and the longitudinal slit substrate integrated waveguide is provided with a longitudinal slit; a MEMS atomic gas chamber; a mode matching excitation structure for exciting a microwave magnetic field to the substrate integrated waveguide annular gap cavity; and an electromagnetic shielding and heating assembly arranged outside the substrate integrated waveguide annular gap cavity. The application can effectively solve the key problem that the resonant performance of a printed miniature annular gap cavity is extremely sensitive to the size change of subwavelength structure parameters, increase the processing tolerance of the ultra-miniature integrated chamber, reduce the processing difficulty and manufacturing cost of high-precision PCB through holes, and improve product yield.

A magnetless cryogenic circulator is developed that has three identical resonators in three branches. Each branch connects two ports and each resonator has a capacitor connected across a tunable inductor. A set of tunable inductors modulated with modulation signals that have a relative phase of 0°, 120° and 240° provided through a circuit. A microstrip delay line for providing the modulation signal to the three resonators, wherein the resonators are modulated in time such that the degeneracy of the two inherent counter-rotating modes is lifted, achieving a non-reciprocal signal routing. All capacitors and inductors are monolithically integrated and fabricated using a multi-layer Nb-based process with Nb / AlOx / Nb JJs.

The invention provides an on-chip terahertz band-pass filter based on an artificial surface plasmon high-order mode, and the on-chip terahertz band-pass filter comprises a dielectric substrate, a feed microstrip line, a first transition structure, a short-branch artificial surface plasmon transmission region, a second transition structure, and a long-branch artificial surface plasmon transmission region. Feed microstrip lines are arranged at the two ends of the front face of the dielectric substrate respectively, each feed microstrip line is sequentially connected with a first transition structure, a short-branch artificial surface plasmon transmission area and a second transition structure, and a long-branch artificial surface plasmon transmission area is located in the middle of the front face of the dielectric substrate. Two ends of the long branch artificial surface plasmon transmission region are respectively connected with a second transition structure, and the whole back surface of the dielectric substrate is covered with a metal layer as a metal ground; the wide-stop-band microstrip antenna has the advantages of being wide in stop band, easy to machine, small in transmission loss and small in crosstalk, does not need punching operation, and is convenient to machine.

The invention relates to the technical field of antennas, and further relates to a wide-beam multi-vibrator planar antenna supporting Tiantong Beidou frequency bands, which comprises a multi-vibrator radiation array element layer, a coplanar feed-amplitude shaping network, a stepped impedance matching section, a low-loss double-layer dielectric laminated layer and a metal reflecting plate, the outermost side of the multi-oscillator radiation array element layer is a PCB lamination layer; the coplanar feed-amplitude shaping network comprises a radiation patch, and different current amplitudes are provided for all oscillators through phase shift sections with different electric lengths so as to ensure that the half-power beam width can still reach 90 degrees or above under the condition of the shortest Beidou wavelength; the stepped impedance matching section is a pi-shaped converter formed by connecting three microstrip lines with different widths in series; and the low-loss double-layer dielectric laminated layer is used for solving the minimum distance between the metal reflecting plate and the PCB laminated layer according to the theoretical minimum gain. The antenna has the advantages of compact structure, stable gain and wide beam width.

The invention discloses a PCB wiring design method and system considering a pulse current fusing effect, and relates to the technical field of PCB design. The method comprises the following steps: based on a differential impedance design principle, including design rules of a differential microstrip line and a differential strip line, determining parameters such as the width, the thickness, the line spacing and the medium thickness of a wire so as to meet the impedance value requirement; based on the heat balance equation of the current-carrying conductor, a current conductor heating model and a current-carrying conductor heat dissipation model are established; on the basis of differential impedance design and in combination with the proposed binary particle swarm optimization algorithm, the electromagnetic compatibility factor can be comprehensively considered, the problems of low efficiency and electromagnetic compatibility existing in large-scale wiring design are effectively solved, rapid and accurate design of large-scale wiring can be achieved through an efficient calculation process, and the method is suitable for large-scale wiring design. The design efficiency and quality are remarkably improved, and the design requirement for the routing pulse fusing effect of a high-speed PCB signal is met.

The invention belongs to the technical field of laser processing, and particularly relates to a curved-surface substrate laser confinement cleaning system and method. The system comprises a control system, a three-dimensional motion platform, a laser and a laser focusing unit, wherein a curved-surface substrate of a metal pattern to be cleaned is fixed on the three-dimensional motion platform; the visual auxiliary positioning system is used for recognizing the space posture of the cleaning area and is electrically connected with the control system. And the control system generates a CAD model and a cleaning path based on an identification result, and cooperatively controls the three-dimensional motion platform and the laser, so that the laser incidence direction is kept within the range of + / -5 degrees of the normal of the target point, and confinement cleaning of the curved surface metal pattern is realized. According to the method, an intelligent reverse decision model of'performance deviation-trimming quantity-laser parameters' is further established, deviation of actually measured electromagnetic performance and a design target is used as input, the material removal quantity and the laser parameters are automatically solved, and closed-loop control of performance diagnosis and trimming machining is formed. The method has the advantages of high-precision positioning, normal incidence control, curvature adaptive compensation and performance-oriented intelligent trimming, and is suitable for high-precision and low-damage local metal removal of LTCC substrates and array plane microstrip lines.

The utility model discloses a balun-integrated full-wave oscillator radiation unit, and aims to solve the problems that a low-frequency bowl-shaped oscillator and a high-frequency die-cast half-wave oscillator are used in the conventional high-low frequency nesting scheme, so that the requirements of miniaturization and light weight of an antenna are difficult to meet, the processing cost is extremely high, and the cost is low. And meanwhile, the high-frequency oscillator is arranged in the bowl-shaped oscillator, so that the horizontal plane wave width deformation of the high-frequency oscillator is caused, the gain is influenced, and the market demand cannot be met. The Balun-integrated full-wave oscillator radiation unit comprises a fixed support and a PCB radiation plate installed on the fixed support. The structure of the full-wave oscillator is relatively simple, assembly can be completed only by installing the single-balun integrated feed sheet in the fixing support and welding and fixing the single-balun integrated feed sheet and the PCB radiation plate, miniaturization design can be achieved through the microstrip technology, the printed circuit technology and the like due to the fact that single-face embedded coupling is adopted, the requirement of miniaturization equipment is met, machining is easy, and cost is low. The production efficiency can be greatly improved, and the production cost is reduced.

The invention provides a liquid crystal phase shifter, an antenna device and an antenna system, and relates to the technical field of communication. The liquid crystal phase shifter comprises a first dielectric substrate, a grounding metal layer, a dielectric functional layer, a micro-strip signal line and a second dielectric substrate which are stacked in sequence, the grounding metal layer is provided with a plurality of groups of grid structures which are arranged at intervals, and each group of grid structure comprises a plurality of grids which are distributed at intervals; and the length direction of the micro-strip signal line is parallel to the arrangement direction of the plurality of groups of grid structures. In the embodiment of the invention, the defected ground structure is formed by the plurality of groups of grid structures on the grounding metal layer, so that a relatively wide microstrip signal line can be conveniently arranged, and a relatively thin dielectric functional layer can be arranged under the condition that the characteristic impedance of the liquid crystal phase shifter is ensured, so that the miniaturized liquid crystal phase shifter is realized; in addition, when phase shifting is carried out based on the liquid crystal phase shifter, the thinner dielectric functional layer is convenient for reducing loss and improving response speed, so that the phase shifting performance of the liquid crystal phase shifter is improved.

A microstrip antenna which includes a substrate, a ground on a second side of the substrate, a first patch on a first side of the substrate, and a second patch on the first side of the substrate. The first patch is connected to a first port. The second patch is separated from the first patch and connected to a second port. Each of the first and second patches is further formed with a plurality of shorting vias connected to the ground. The radiation patterns of each element also feature the RPD characteristic, which is promising for large-scale MIMO or array antennas.

The invention discloses a highly packaged magnetic sensing chip based on an NV color center, and the chip comprises a packaging housing (1) which is provided with a packaging pedestal and chip pins. The chip is characterized in that the chip also comprises an NV color center diamond (2) which is arranged on the packaging base; the laser diode bare chip (3) is arranged on the packaging base, and the light-emitting side of the laser diode bare chip faces the NV color center diamond; the microwave transmission microstrip line (4) is arranged between the interior and the edge of the packaging base and is electrically connected with the chip pins; the first photoelectric detector assembly (5) is arranged on the NV color center diamond and used for collecting fluorescence signals.

The invention provides a miniaturized broadband non-reflection filtering antenna and communication equipment, and relates to the field of communication antennas. The antenna comprises a hybrid coupling resonance system and a matched absorption network, wherein the hybrid coupling resonance system comprises a main radiation groove which is formed in a metal floor and is of a split ring structure, and two parasitic radiation grooves which are of a U-shaped structure and are located on the two sides of the main radiation groove respectively; the matching absorption network comprises an absorption resistor connected with the feed microstrip line in parallel and an absorption microstrip line connected with the absorption resistor in series. According to the embodiment of the invention, the absorption circuit is integrated on the structure, so that the antenna has the non-reflection characteristic in the range of 1.27-2.31 GHz far beyond the radiation bandwidth, the defect that the radio frequency front-end performance is deteriorated due to in-band reflection and out-of-band energy reflection back to a transmitting channel of a traditional antenna is effectively overcome, and the electromagnetic compatibility and the linear characteristic of the whole system are remarkably improved.

The invention discloses a frequency quasi-independent controllable double-frequency electrically small rectification circuit, and belongs to the field of radio frequency energy collection. The rectifying circuit comprises a double-frequency matching network, a blocking capacitor, two Schottky diodes, a filter capacitor and a resistive load. The dual-frequency matching network is composed of a capacitor, an inductor and a microstrip line and used for achieving impedance matching of two working frequency points and achieving quasi-independent regulation and control of the positions of the two frequency points by adjusting the value of the inductor and the length of the microstrip line. And the microstrip line is bent for five times so as to realize the miniaturization of the overall structure of the circuit. The blocking capacitor is used for blocking a direct current component and avoiding energy feedback; the two Schottky diodes are used for converting a radio frequency signal into direct current energy; the filter capacitor is used for improving the smoothness of output direct current energy and improving the energy conversion efficiency. The device is compact in structure, adjustable in frequency point position and suitable for a dual-band radio frequency energy collection scene.

A waveguide to transmission line coupler is provided. The waveguide can be capable of guiding electromagnetic energy and can have a plurality of coupling sets along the waveguide. The coupling set can include a non-resonant coupling aperture capable of coupling said electromagnetic energy from the waveguide to at least one output transmission line and a tuning element in the waveguide proximate to said non-resonant coupling aperture thereto, capable of tuning out residual shunt susceptance corresponding to the electromagnetic energy coupled by said non-resonant coupling aperture.

The utility model provides a coupler and a radio frequency chip. The coupler provided by the utility model comprises a first microstrip line and a second microstrip line coupled with the first microstrip line, two ends of the first microstrip line are respectively provided with a radio frequency input port and an antenna output port, and two ends of the second microstrip line are respectively provided with an isolation port and a coupling output port; the coupler further comprises a first resonance circuit, a second resonance circuit and a first resistor. The first resonance circuit, the second resonance circuit and the first resistor are used for optimizing the isolation and directivity of the coupler. Compared with the prior art, the coupler provided by the utility model has the advantages of high isolation, good directivity and lower power fluctuation. On the basis of the original design of the coupler, a resonant circuit is directly added to broaden the frequency range. The microstrip line is used as a basic structure, so that high isolation, high directivity and low power fluctuation are realized under the conditions of low cost and low design complexity.

The present invention discloses a microwave topological photonic crystal metasurface antenna, which belongs to the field of communication technology. The present invention adopts a layered structure similar to a patch antenna, including a ground plate, a dielectric layer, a topological photonic crystal, a rectangular metal frame, and a microstrip feeder arranged from bottom to top. The topological photonic crystal is arranged above the dielectric layer, the rectangular metal frame is coated on the periphery of the topological photonic crystal, and the microstrip feeder is connected to the rectangular metal frame. The present invention can achieve multi-band characteristics and extended bandwidth. In addition, most of the electromagnetic waves propagated by the antenna within the band gap range are suppressed, and only electromagnetic waves of the angular state frequency can propagate, with smaller return loss, and the topological angular state can achieve unidirectional radiation, with better directivity at high frequencies. As a result, the antenna performance is greatly improved, which is very suitable for on-chip optical interconnection and photonic chip integration, and meets the needs of 5G / 6G communications, quantum computing, etc. for miniaturized devices.

A microstrip patch log periodic antenna (MSPLPA) may include a ground plane, a dielectric material, a printed circuit board comprising a microstrip patches. Each of the microstrip patches may be configured to transmit and / or receive signals. The dielectric material may be disposed between the ground plane and the printed circuit board. Each of the microstrip patches may be frequency scaled.

The invention discloses a high-linearity low-noise amplifier based on harmonic suppression, relates to the field of communication and the technical field of electronic devices, and is used for solving the problem that the noise coefficient of an existing Darlington structure is large. Comprising a noise matching and input matching network, a linearity enhancement structure, a negative feedback structure and a pre-distortion structure. Wherein the linearity enhancement structure at least comprises a first amplification transistor and a second amplification transistor which are arranged in parallel, and is used for improving the linearity of the circuit through harmonic cancellation; the negative feedback structure is connected with the noise matching and input matching network and the pre-distortion structure and is used for expanding circuit bandwidth and optimizing output matching; the pre-distortion structure is used for stabilizing the bias voltage of the third amplification transistor. According to the invention, the linearity of the whole circuit is effectively improved, and the source microstrip lines of the two circuits are utilized to improve the minimum noise matching and improve the noise performance. Noise is reduced, linearity is improved, low-frequency gain is suppressed, and bandwidth of the whole circuit is improved.

The invention discloses a method for acquiring passive intermodulation interference caused by oxidation corrosion of a base station antenna, and aims to further supplement and improve the existing research so as to quantitatively evaluate the passive intermodulation interference generated after the oxidation corrosion of the base station antenna. An analysis object is set as the side surface of a microstrip line conductor, firstly, the amplitude coefficient AD2 of voltage of each point in the lower edge area of the side surface of an unoxidized and corroded microstrip line under the action of a single carrier signal is determined, and then after it is determined that the microstrip line is oxidized and corroded, the amplitude coefficient AD2 of voltage of each point is determined. According to the method, the tunneling current density JMIM and the total tunneling current IMIM of the oxidation corrosion areas are obtained according to the average voltage value of the oxidation corrosion areas, and on the basis, the third-order passive intermodulation voltage V3rd-PIM (t) is calculated, so that the passive intermodulation interference generated after oxidation corrosion of the base station antenna is quantitatively evaluated.

The invention relates to an S-band high-reliability patch filtering antenna, and belongs to the technical field of filtering antennas. The antenna comprises a metal floor, a bottom dielectric substrate and a top dielectric substrate which are sequentially stacked from bottom to top. Wherein the upper surface of the top dielectric substrate is provided with a coplanar coupling structure and a rectangular driving patch provided with a U-shaped groove, and a broadband and a low-frequency radiation zero point are generated; and a rectangular branch is arranged on the lower surface of the top dielectric substrate to generate a high-frequency radiation zero point. The patch filter antenna further comprises a microstrip line used for coaxial feed, and the microstrip line penetrates through the metal floor and the bottom dielectric substrate and is connected with the rectangular branch on the lower surface of the top dielectric substrate. High reliability is achieved through the double-layer dielectric substrate, structure simplification and low cost are achieved through the plane structure, and the working bandwidth, out-of-band rejection and the rectangular coefficient of the patch filter antenna are improved through reasonable arrangement of the parasitic patches.

The invention, which relates to the technical field of modern communication, discloses a metasurface-based high-gain low-profile dual-circularly polarized antenna comprising a first dielectric plate, a second dielectric plate arranged below the first dielectric plate, and a metasurface structure arranged above the first dielectric plate. Three rows and three columns of periodically arranged metasurface structures are arranged above the first dielectric plate, a multi-level cooperative working mechanism is constructed by combining 45-degree symmetrical composite gaps etched in a layer indirect floor and a microstrip feeder line which is orthogonally arranged on the lower layer, and the metasurface array realizes high-gain radiation by regulating and controlling the phase of electromagnetic waves. The composite slot structure efficiently converts microstrip line energy into an orthogonal degenerate mode through non-contact coupling, circular polarization purity is guaranteed, the axial ratio bandwidth is expanded to 24.2%, an orthogonal microstrip feeder line forms a 90-degree phase difference through accurately controlled size, high isolation and stable standing-wave ratio of double ports are guaranteed, and the antenna has a wide application prospect. And finally, dual-circular-polarization independent radiation is realized in a 5mm low-profile structure.

The invention belongs to the technical field of microwave antennas, and particularly provides an ultra-low-profile wide-angle scanning ultra-wideband tight coupling phased-array antenna based on double mountain-shaped dipoles. The ultra-wideband antenna comprises an ultra-low-profile wide-angle scanning ultra-wideband radiation structure (I) based on double-E-shaped dipoles, namely an improved double-E-shaped dipole radiation structure; a feed strip line and a balun structure (II), namely a strip line feeder using a gradually changed defected ground on a vertical plane and a balun structure at the tail end; and the feed microstrip line structure (III) is a microstrip line feeder line on a horizontal plane. According to the invention, the improved double-E-shaped radiation structure is applied to the tightly-coupled antenna, which is equivalent to the introduction of a plurality of LC parallel matching branches in a unit aperture, so that the impedance matching of an array can be greatly improved, especially the impedance matching of low frequency is improved, the low-frequency bandwidth is expanded, and the scanning capability is improved at the same time.

The invention discloses a high-isolation broadband four-port dual-polarized antenna based on differential and common modes and a communication terminal. Comprising a feed layer, a lower dielectric layer, a metal floor, an air layer, an upper dielectric layer and a radiation patch which are stacked in sequence. The feed layer is located on the lower surface of the lower dielectric layer and comprises a feed connector, a micro-strip feeder line, a lumped capacitor, a lumped inductor, a feed metal column and a short circuit metal column. The metal floor is located on the upper surface of the lower dielectric layer, and a plurality of circular gaps concentric with the feed metal columns are etched in the metal floor. The radiation patch is located on the upper surface of the upper dielectric layer, is composed of a horizontal rectangular metal, a vertical rectangular metal and an inclined metal branch, and is used for improving the isolation between different feed ports. The antenna has the characteristics of simple structure, wide band, high isolation and dual polarization, and is suitable for application scenes such as multiple-input-multiple-output (MIMO) systems, radars, satellites and base stations.