33results about How to "Achieve Broadband Performance" patented technology

The invention discloses a micro-strip-to-waveguide vertical transition structure achieved through multi-layer step type substrate integration waveguide. One section of multi-layer step substrate integration waveguide is adopted through the structure to achieve the vertical transition of a micro-strip and a caliber of the waveguide between the micro-strip and the caliber of the waveguide. Coupling calibers are etched among all layers of step substrate integration waveguide and between the substrate integration waveguide at the lowest layer and the caliber of the waveguide, the multi-layer substrate integration waveguide in the two plane directions is in matched connection with the single-layer micro-strip through the step structure, and the broadband performance is achieved. The novel multi-layer step substrate integration waveguide structure is adopted, the short circuit plane is omitted, the plane integration is facilitated, and especially connection between a plane circuit and a waveguide structure system is facilitated. The broadband performance is achieved by optimizing the design calculation.

The invention relates to the technical field of microwave antennas, in particular to a coplanar waveguide fed broadband ultra-surface antenna, which comprises a first dielectric substrate, a second dielectric substrate, a third dielectric substrate, an electromagnetic ultra-surface part, an excitation layer part and a short-circuit reflecting floor part. Antenna radiation is achieved by using thegap of the ultra-surface, and good broadside characteristic is achieved; a micro-strip loaded butterfly-shaped fed gap is used for coupling excitation of the ultra-surface, thereby successfully exciting three resonant modes in the ultra-surface; the relative midbandwidth reaches 51.2%; compared with the ultra-surface antenna before, the impedance bandwidth is greatly improved; the short-circuit reflecting floor structure is used in the invention so that not only backward radiation suppression of the antenna is realized but also a low-profile design is finished. The coplanar waveguide fed broadband ultra-surface antenna in the invention realizes the broadband radiation bandwidth performance and good radiation characteristic of the planar antenna and can effectively enhance the performance of the antenna in a radar, imaging, wireless communication and other systems.

The invention belongs to the technical field of antennas, and discloses a broadband wide-angle-axial-ratio circularly-polarized patch antenna. The antenna comprises a radiator and a one-to-four feed network. The radiator is composed of four Y-shaped coupling structures and circular radiation sheets which are printed on a first dielectric plate and have the same specification, a ground printed on asecond dielectric plate, six L-shaped parasitic branches which are uniformly distributed around the ground and have the same specification, and four dielectric cylinders which play a role in supporting. The feed network is composed of a two-stage cascaded Wilkison power divider and a 90-degree phase shifter which are printed on a third dielectric plate. According to the invention, the circular radiation patch is fed in a coupling mode, the network adopts the Wilkison power divider and the 90-degree phase shifter which are printed on the medium and are in a multi-stage cascade mode, and the antenna is easy to process, low in profile, light in weight and wide in working bandwidth and can be applied to a navigation system and the like.

The invention relates to a metal cavity broadband antenna. According to the basic structure, the metal cavity broadband antenna comprises a flat-box-shaped hollow metal cavity with gaps formed in the top and a coaxial connector. The gaps formed in the upper surface of the metal cavity comprise the I-shaped gap in the middle of the top of the metal cavity, the linear gaps in the two sides of the top of the metal cavity, and technological gaps in the two sides of the metal cavity in the length direction in the shape of []. An inner conductor of the coaxial connector stretches into the metal cavity and is connected with the inner top of the metal cavity. The integrated single metal cavity structure is adopted for the metal cavity broadband antenna and thus is simple in structure, and the antenna machining difficulty is reduced. The single metal material is adopted, so that hidden danger of deformation and layer disengagement caused by different expansion coefficients of multiple materials is eliminated. Because the metal material is good in thermal conductivity and electrical conductivity, thermal control design and electrostatic protection of a satellite-borne phased-array antenna are facilitated. The metal cavity and the gaps are all made full use of, and thus the broadband performance of the antenna is achieved. The profile of the antenna is low, when the antennas are used for combining a planar antenna array, the planar antenna array is of a honeycomb structure, and the metal cavity broadband antenna has the advantage of being high in structural strength.

The invention discloses a double-frequency filtering power divider for WLAN (wireless local area network). The double-frequency filtering power divider comprises a substrate (1), a broadband power divider (2) and a double-frequency filter (3). The double-frequency filtering power divider has the advantages that the filtering and power distribution functions are integrated, two resonance points are produced at the working frequency band of the WLAN, and the miniature design is favorably realized in a WLAN communication system; the broadband power divider (2) is of a T-shaped node structure, the broadband property is realized, and the insertion loss is less than the insertion loss of the traditional Wilkinson power divider; the basic type of the double-frequency filter (3) adopts a two-order SIR (step impedance resonator), and two different resonance points can be obtained by adjusting the widths and lengths of two micro band lines of the SIR.

The invention relates to a miniaturized wideband frequency-directional diagram reconfigurable antenna. With the miniaturized wideband frequency-directional diagram reconfigurable antenna, technical problems of many antennas and low radio-frequency front-end integration degree of the existing wireless communication system can be solved. The reconfigurable antenna comprises a ground plate, a dielectric substrate, a forked microstrip feeder and four PIN diodes. The ground plate is arranged at the upper surface of the dielectric substrate; the first PIN diode and the second PIN diode are loaded on a vertical gap between two sickle type gaps of the ground plate and are connected or disconnected simultaneously; the forked microstrip feeder is arranged at the lower surface of the dielectric substrate; and the third PIN diode and the fourth PIN diode are loaded at connection part of a horizontal branch and a vertical branch of a U-shaped structure of the forked microstrip feeder respectively and are connected simultaneously or one of the third PIN diode and the fourth PIN diode is connected. With control of different combination states of the diodes, the antenna realization frequency and the directional diagram can be reconstructed. The antenna that can work at the frequency band of a fourth generation mobile communication system TD-LTE (3.4-3.8GHz) and a satellite communication system C-band (3.7-4.2GHz) has advantages of simple structure, low cost, and high reliability and can meet the compact and high-integration requirement of the wireless communication system.

The invention discloses a pattern-reconfigurable filter antenna, comprising a dielectric substrate and a filter antenna module and a control module located above and below the dielectric substrate respectively. The filter antenna module comprises a feeder line, a multimode resonator and a transmitting antenna. Energy is transmitted in a coupling way between the multimode resonator on one hand andthe feeder line and the transmitting antenna on the other hand. The control module comprises a reflector and a reflector switch. The reflector is used for reflecting the electromagnetic wave radiatedby the transmitting antenna to control the radiation direction of the transmitting antenna. The reflector switch is used for controlling the enabling of the reflector. The impedance characteristic andfrequency characteristic of the filter antenna can be kept basically unchanged while the pattern of the filter antenna is reconfigurable.

The invention discloses a capsule antenna. The capsule antenna comprises an upper dielectric plate, a lower dielectric plate, a metal pole, a metal cover, a polyimide shell, a metal stripe and a feedmetal probe, wherein the metal pole is embedded into the center of the upper dielectric plate and the center of the lower dielectric plate, the metal cover is arranged on the top surface of the upperdielectric plate, and the bottom surface of the lower dielectric plate is covered with an annular metal layer; the polyimide shell has biocompatibility, and the exterior is in direct contact with human tissues; the metal stripe clings to the inner wall of the shell and forms an external metal ring with the annular metal layer on the bottom surface of the lower dielectric plate, and a slot antennastructure is formed among the metal ring, the metal pole and the metal cover. The metal pole serves as a carrier of a battery, and the influence of the battery on antenna performance can be shielded.Electronic parts and components of a wireless endoscope system are arranged inside the metal cover, and the influence on the radiation performance of the antenna is avoided as well. A feed port is formed in the top of the metal cover, one end is connected with the metal stripe, and the other end is connected with the metal stripe inside the polyimide shell, so that a half wave length resonant slotantenna is simulated.

The present invention relates to a winding device (1) for a cross-wound bobbin-producing textile machine having a bobbin drive roller (3), a coil frame (5) for rotatably supporting a cross-wound bobbin (4) and a coil frame axis (6) rotationally fixed to the coil frame (5) is, has an extension through the connection with the coil frame (5) and for pivoting out of the coil frame (5) is pivotally mounted. According to the invention, the winding device (1) comprises a vibration damper (46) having an absorber mass (40, 42) and an associated elastic member (41, 43) and the elastic element (41, 43) engages in the region of the extension of the coil frame axis (6) spaced apart on the creel shaft (6) from the bobbin frame (5).

The invention discloses a radio frequency micro-electromechanical microstrip antenna, and belongs to the technical field of wireless communication. The radio frequency micro-electromechanical microstrip antenna comprises a metal frame and a microstrip antenna unit, wherein the microstrip antenna unit comprises a first adapter plate, a second adapter plate and a third adapter plate; metal shieldingstructures surrounding the central areas of the respective adapter plates are arranged on the three adapter plates, and the vertical interconnection of the metal shielding structures among the threeadapter plates is achieved by BGA interconnection structures; a first radiation patch is arranged on the front face of the first adapter plate; an air hole and a parasitic patch are arranged on the second adapter plate; a second radiation patch is arranged on the front face of the third adapter plate, and a reflecting surface s arranged on the back surface of the third adapter plate; and a feedinghole and a grounding hole are formed in the central area of the third adapter plate. The radio frequency micro-electromechanical microstrip antenna disclosed by the invention has the characteristicsof low profile, high gain and high bandwidth, and can solve the problems of narrow bandwidth and low gain of a low-profile microstrip antenna of a semiconductor substrate with a high dielectric constant.

The invention relates to the technical field of antennas, and discloses a broadband feed source antenna based on asymmetric feed, which is characterized by comprising a waveguide tube, a horn is arranged at one end of the waveguide tube, a short circuit plate is arranged at the other end of the waveguide tube, and four groups of feed structures are arranged on the waveguide tube. The four groups of feed structures are arranged on the outer side wall of the waveguide tube in an annular array mode, each feed structure comprises a feed end and a conical probe, the conical probes are arranged in the waveguide tube and play a role in disturbing an electromagnetic field in the waveguide tube so that the electromagnetic field can excite a needed field, meanwhile, the conical structures of the conical probes can effectively broaden the matching bandwidth at the feed position, the broadband performance is thus achieved, and due to the fact that in the axial direction of the conical probe, the amplitude phases of electric fields on all surface points are different, the design of the conical probe with the gradually-changed size is adopted, and the matching bandwidth of corresponding ports can be independently widened; uniform-amplitude and anti-phase signals are fed into the feed structures opposite in position, so that the two conical probes opposite in position excite a co-polarization field in the waveguide tube.

The invention discloses a 5G broadband trap wave circular polarized antenna comprising a dielectric substrate, a metal reflecting plate, a metal radiation paster group and a coaxial line feed structure, wherein the metal reflecting plate is positioned below the dielectric substrate, the metal radiation paster group consists 2n same rectangular pasters having chamfered angles, n is a natural numberexcept zero, one half of the rectangular pasters are distributed on an upper surface of the dielectric substrate in a semi-circumference array mode while the other half of the rectangular pasters aredistributed on a lower surface of the dielectric substrate in a semi-circumference array mode, the two half rectangular pasters groups can form full circle distribution, the chamfered angles of all the pasters can be overlapped on a circumference edge, every two neighboring pasters in each half rectangular paster group are connected via a microstrip line, fine gaps and slots are etched in each paster, and the coaxial line feed structure is used for feeding the metal radiation paster group via a metal reflecting plate. The 5G broadband trap wave circular polarized antenna is advantaged by widefrequency bandwidth, simple structure, easy processing operation, low cost and the like.

The invention relates to the technical field of antennas, and relates to a circularly polarized patch antenna shaped like a Chinese character 'jia'. The antenna includes a ground plate and a dielectric layer plate, wherein the ground plate and the dielectric layer plate are parallel to each other. The dielectric layer plate is arranged above the ground plate. A metal sheet A is arranged at the top of the dielectric layer plate, and a metal sheet B is arranged at the bottom. A 3D L-shaped probe is arranged between the ground plate and the dielectric layer plate. The 3D L-shaped probe consistsof a vertical rod and two horizontal rods of equal length. One end part of one horizontal rod and one end part of the other horizontal rod are fixedly vertically connected. The top of the vertical rodis fixedly connected with the common end part of two horizontal rods. Each horizontal rod is parallel to the dielectric layer plate. The vertical rod is perpendicular to the ground plate. The groundplate is provided with a through hole. The lower end of the vertical rod passes through the through hole and is connected with the coaxial connector arranged at the bottom of the ground plate. The ground plate and the dielectric layer plate are square, and the length of the sides is the same. The metal sheet A is shaped like a Chinese character 'jia'. The antenna provided by the invention has theadvantages of simple structure, low cost, beautiful appearance, safety and reliability.

The broadband low-profile miniaturized AMC cavity monopole antenna comprises a monopole antenna body, parasitic structures, a broadband AMC structure and a metal cavity, the monopole antenna body is installed on the side wall of the cavity, the parasitic structures are located on the two sides of the monopole antenna body and are flush with the opening face of the cavity, and the broadband AMC structure is a square patch type AMC structure with an air layer. The dielectric substrate is located between the monopole antenna and the bottom surface of the cavity, a square array is printed on the dielectric substrate, and an air layer is arranged between the dielectric substrate and the bottom surface of the cavity. According to the invention, the monopole and the parasitic structure are placed on the side wall of the cavity, so that wide beam coverage in the broadband of the antenna is realized, the space of the cavity is effectively utilized, and miniaturization and light weight of the antenna are realized; moreover, based on the broadband AMC structure, the profile of the antenna is reduced by 40% under the condition of keeping 32% bandwidth of the cavity monopole antenna, and the whole antenna has good impedance and radiation characteristics in a small-size cavity.

The invention provides a broadband multi-layer flat-plate dual polarized antenna array, comprising horizontal radiation units arranged in the form of an n*m array, vertical radiation units arranged inthe form of an m*n array, a plurality of balanced feed structures, an upper dielectric material, a middle dielectric material plate, a lower dielectric material plate, a metal bottom plate and a feeddevice, wherein n and m are integers. The antenna array achieves a broadband effect by adopting the technical measures of using the radiation units with step structures for enhancing the coupling effect and the balanced feed structures, loading dielectric layers above the radiation units and the like. At the same time, since the horizontal radiation units and the vertical radiation units are spatially perpendicular to each other, dual polarization performance is formed.

The invention discloses a multifunctional polarization adjusting component based on a three-dimensional composite structural unit. A surface of a metal film has multiple periodically arranged three-dimensional T-shaped structural units; the three-dimensional T-shaped structural units include a first structure and a second structure which are both square tile-shaped structures, and the first structure and the second structure are vertically arranged and spaced apart to form an approximately T-shaped structure; a first frequency band has the quarter-wave plate function, a second frequency band has the half-wave plate function, and the first frequency is lower than the second frequency. Similarly, the multi-functional polarization adjusting component based on the three-dimensional composite structural unit is disclosed, a first frequency band has the half-wave plate function, and a second frequency band has the quarter-wave plate function. The adjusting component is advantaged in that thecomposite structural unit can be utilized to realize different optical functions in different working frequency bands in the infrared band to further promote miniaturization and integration of an optical component.

The invention discloses a broadband dipole. The broadband dipole comprises a reflection plate and a radiation unit installed on one side surface of the reflection plate. The radiation unit comprises aradiation assembly, a feed balun and a matching network. The radiation assembly is electrically connected with the matching network through the feed balun, the matching network is fixed on the reflection plate, and the radiation assembly is integrally of a curved surface structure arched towards the direction far away from the reflection plate. The radiation assembly comprises a flexible radiation base body and an insulating supporting piece, wherein the radiation base body is attached and fixed on the insulating supporting piece, and the insulating supporting piece is fixedly connected withthe reflecting plate. According to the invention, the effect of realizing broadband performance in an extremely small space can be achieved.

The invention discloses a pattern-reconfigurable filter antenna, comprising a dielectric substrate and a filter antenna module and a control module located above and below the dielectric substrate respectively. The filter antenna module comprises a feeder line, a multimode resonator and a transmitting antenna. Energy is transmitted in a coupling way between the multimode resonator on one hand andthe feeder line and the transmitting antenna on the other hand. The control module comprises a reflector and a reflector switch. The reflector is used for reflecting the electromagnetic wave radiatedby the transmitting antenna to control the radiation direction of the transmitting antenna. The reflector switch is used for controlling the enabling of the reflector. The impedance characteristic andfrequency characteristic of the filter antenna can be kept basically unchanged while the pattern of the filter antenna is reconfigurable.

The invention provides a microwave and millimeter wave coplanar common-caliber antenna based on an embedded structure. The antenna comprises a high-frequency feed microstrip structure, a low-frequency feed microstrip structure, a metal ground, a first metallization groove formed in a second substrate, a second metallization groove formed in the third substrate, and a feed metal strip arranged on the second substrate and positioned between the two rows of first metallization grooves; the feed metal strip is connected with the low-frequency feed microstrip structure through a first metal through hole formed in the second substrate, a first round hole formed in the metal ground and a second metal through hole formed in the first substrate in sequence and is not in contact with the metal ground; and the antenna also includes an antenna radiation patch. According to the microwave and millimeter wave coplanar common-caliber antenna based on the embedded structure, the millimeter wave dielectric resonator antenna array is embedded into the microwave antenna array, the edge-emitting microwave / millimeter wave coplanar common-caliber antenna is achieved, the whole antenna can be machined through a PCB technology, and the integration level is high.

The present invention relates to a winding device (1) for a cross-wound bobbin-producing textile machine having a bobbin drive roller (3), a coil frame (5) for rotatably supporting a cross-wound bobbin (4) and a coil frame axis (6) rotationally fixed to the coil frame (5) is, has an extension through the connection with the coil frame (5) and for pivoting out of the coil frame (5) is pivotally mounted. According to the invention, the winding device (1) comprises a vibration damper (46) having an absorber mass (40, 42) and an associated elastic member (41, 43) and the elastic element (41, 43) engages in the region of the extension of the coil frame axis (6) spaced apart on the creel shaft (6) from the bobbin frame (5).

The invention provides a metasurface antenna based on square semi-ring feed. The metasurface antenna comprises a dielectric substrate, a metal floor printed on the lower surface of the dielectric substrate and a metasurface patch printed on the upper surface of the dielectric substrate. The metasurface patch comprises a plurality of square metal patches which are periodically arranged, a spacing seam is etched in the center of the metasurface patch, a rectangular metal patch is printed in the spacing seam, and the rectangular metal patch is connected with the metal floor through a first metalized through hole. The rectangular metal patch is connected with an SMA inner conductor through a second metalized via hole penetrating through a preformed hole in the metal floor, and the second metalized via hole, the rectangular metal patch and the first metalized via hole which are sequentially connected form a square semi-ring structure, so that the defect of low front-to-back ratio caused by incomplete floor in the prior art is overcome, on the premise of using the single-layer metasurface structure, not only is the profile height of the antenna reduced, the impedance bandwidth of the antenna is further expanded, and the antenna better conforms to the miniaturization and integration trend of a current communication system.

The invention relates to a broadband differential feed microstrip filtering antenna, and aims at overcoming that a traditional microstrip antenna is narrowband and incapable of gain selection. The antenna in the invention comprises three dielectric substrates, an air layer between the upper and middle dielectric substrates, a main radiation patch positioned in the upper surface of the middle dielectric substrate, a parasitic patch positioned in the lower surface of the upper dielectric substrate, the floor with a pair of slits, and a feed microstrip line positioned in the lower surface of thelower substrate and provided with a pair of branches and resonance slits; and the main radiation patch and the parasitic patched covered by the medium generate resonance, the broadband and high-gain radiation passband are provided, and a zero gain point in the edge of the passband is generated. The radiation characteristic of the antenna is further improved via a differential feed technology, andminiaturized and integrated design is easy to realize. The antenna provided by the invention is simple in structure, wider in bandwidth, high in selectivity, can be processed via PCB technology, low in processing cost and capable of large-scale production.

The invention discloses a tunable decoupling network for a multi-antenna system, and the network comprises a tunable circuit and N-1 parasitic bodies, wherein N is equal to the number of antennas in the multi-antenna system, the tunable circuit is composed of N-1 tunable units, each tunable unit comprises three electronic devices, the three electronic devices are tunable capacitors or tunable inductors, one end of the first electronic device serves as a first connecting end of the tunable unit, the other end of the first electronic device, one end of the second electronic device and one end of the third electronic device are connected, and the connecting ends of the first electronic device, the second electronic device and the third electronic device serve as a second connecting end of the tunable unit; the other end of the second electronic device is a third connecting end of the tunable device, the other end of the third electronic device is grounded, the second connecting ends of the N-1 tunable units are connected with one ends of the N-1 parasitic bodies in a one-to-one correspondence manner, and every two adjacent antennas are correspondingly connected with the transmitter through one tunable unit; the advantages are that the miniaturized requirement is satisfied, and the decoupling bandwidth and the decoupling frequency are relatively wide.

The invention discloses a millimeter wave frequency quadrupler with a broadband high-fundamental-wave suppression double-balance self-mixing structure. The millimeter wave quadrupler comprises a third harmonic frequency multiplication unit, a double-balance ring type mixing unit and three transformers. An input signal is converted into a differential signal by the first-stage transformer, the differential signal is injected into the frequency multiplication unit, and one path of signal is divided as a local oscillator of the frequency mixing unit. And the frequency multiplication unit outputs a differential signal, and third harmonics are injected into a source electrode of the frequency mixing unit as intermediate frequency by a second-stage transformer in a differential-to-differential manner. And the frequency mixing unit mixes the fundamental wave and the third harmonic wave to generate a fourth harmonic wave, the fourth harmonic wave is led out by a drain electrode of the frequency mixing unit in a differential mode, and the third-stage transformer outputs the fourth harmonic wave by a differential-to-single end. According to the invention, the double-balance ring type frequency mixing unit is adopted, the unit has good inhibition degree on local oscillation and intermediate frequency leakage, a fundamental wave and third harmonic wave mixing scheme is adopted, the problem that the frequency tripler with the self-mixing structure generates fundamental frequency mixing products is solved, and the fundamental wave inhibition degree of the frequency tripler with the self-mixing structure is greatly improved.

The invention relates to a metal cavity broadband antenna. According to the basic structure, the metal cavity broadband antenna comprises a flat-box-shaped hollow metal cavity with gaps formed in the top and a coaxial connector. The gaps formed in the upper surface of the metal cavity comprise the I-shaped gap in the middle of the top of the metal cavity, the linear gaps in the two sides of the top of the metal cavity, and technological gaps in the two sides of the metal cavity in the length direction in the shape of []. An inner conductor of the coaxial connector stretches into the metal cavity and is connected with the inner top of the metal cavity. The integrated single metal cavity structure is adopted for the metal cavity broadband antenna and thus is simple in structure, and the antenna machining difficulty is reduced. The single metal material is adopted, so that hidden danger of deformation and layer disengagement caused by different expansion coefficients of multiple materials is eliminated. Because the metal material is good in thermal conductivity and electrical conductivity, thermal control design and electrostatic protection of a satellite-borne phased-array antenna are facilitated. The metal cavity and the gaps are all made full use of, and thus the broadband performance of the antenna is achieved. The profile of the antenna is low, when the antennas are used for combining a planar antenna array, the planar antenna array is of a honeycomb structure, and the metal cavity broadband antenna has the advantage of being high in structural strength.

The present invention relates to the technical field of antennas, and relates to a "jia"-shaped circularly polarized patch antenna, which includes a ground plate and a dielectric laminate, the ground plate and the dielectric laminate are parallel to each other; a dielectric laminate is arranged above the ground plate, and the dielectric There is a metal sheet A on the top of the laminate, and a metal sheet B on the bottom; a 3D "L"-shaped probe is installed between the ground plate and the dielectric layer; the 3D "L"-shaped probe consists of a vertical rod and two The two horizontal rods are composed of horizontal rods of equal length, one end of the two horizontal rods is vertically fixedly connected to each other, and the top of the vertical rod is fixedly connected to the common end of the two horizontal rods; each horizontal rod is parallel to the medium layer, The vertical bar is perpendicular to the grounding plate; the grounding plate is provided with a through hole, and the lower end of the straight bar passes through the through hole to connect with the coaxial connector arranged at the bottom of the grounding plate; both the grounding plate and the dielectric layer are square, and the sides The lengths are the same; the metal sheet A is in the shape of "jia"; the invention has the advantages of simple structure, low cost, beautiful appearance, safety and reliability.

The invention relates to an antenna for communication, which comprises a substrate, a top part antenna layer, a bottom antenna layer; the substrate is provided with a top surface and a bottom surfacein opposite to the top surface; the top part antenna layer is arranged on the top surface and comprises a first strip electrode, a second strip electrode and a third strip electrode which are introduced from the same node on the top surface and outwards dispersed; the bottom antenna layer is arranged on the bottom surface and connected with the top part antenna layer by crossing through a substrate through a coaxial feed point. Compared with a traditional multi-frequency terminal antenna, the antenna has better gain characteristic and realizes broadband property instead of point frequency; theantenna has smaller dimension, the structure is simple and easy to realize.

The invention discloses a tunable decoupling network for a multi-antenna system, comprising a tunable circuit and N-1 parasitic bodies, where N is equal to the number of antennas in the multi-antenna system, and the tunable circuit consists of N-1 tunable Unit composition, each tunable unit includes three electronic devices respectively, the three electronic devices are tunable capacitors or tunable inductances, one end of the first electronic device is used as the first connection end of the tunable unit, and the other end of the first electronic device is used as the first connection end of the tunable unit. One end, one end of the second electronic device and one end of the third electronic device are connected and the connection end is the second connection end of the tunable unit, the other end of the second electronic device is the third connection end of the tunable device, the third electronic device The other end of the device is grounded, the second connection ends of the N‑1 tunable units are connected to one end of the N‑1 parasitic bodies in a one-to-one correspondence, and each adjacent two antennas are connected to the transmitter through a tunable unit; the advantages It has a wide decoupling bandwidth and frequency while meeting the requirements of miniaturization.