37results about How to "Suppression of higher order modes" patented technology

The invention discloses a single-polarization single-mode photonic crystal fiber with high nonlinearity. The cross section of the photonic crystal fiber comprises a fiber core and a cladding. The-cladding is a peripheral region which is the same as the normal photonic crystal fiber and is formed by evenly distributed air holes (2) with the same structure. The fiber core is composed of a substrate material (1) which is arranged on the center of the optical fiber end face as well as four high-ellipticity air holes (3) which are closely arranged, not mutually overlapped and in rectangular distribution. In the photonic crystal fiber, a cut off characteristic of two polarization modes of a basic mode can be adjusted by finely adjusting distance between centers of air holes, which causes one of the polarization modes to be cut off in the applied waveband, thus realizing the wide-bandwidth single polarization transmission. Meanwhile, the air holes (3) suppress the generation of high order mode, which allows the cladding to use a higher air filling rate on the premise of not changing the single-mode transmission characteristic of the optical fiber, therefore the mode area and the confinement loss are reduced. The single-polarization single-mode photonic crystal fiber with the high nonlinearity solves the problem that the high nonlinearity, low confinement loss and wide band single-polarization single-mode characteristic can not be realized at the same time in the existing photonic crystal fiber technology.

A multimode occulting antenna with a stable phase center comprises a reflection cavity, a lower radiation paster, an upper radiation paster, four feed probe sleeves, four feed probe inner cores and two support columns. Each feed probe sleeve comprises a metal seat and filler, one end of the metal seat is a metal column, the other end of the metal seat is a cylindrical metal cavity, and the filler is used for filling the cylindrical cavity of the metal seat. The sleeve-shaped probes are coupled with feed through four points, probes are uniformly distributed on the circumference, an aerial radiation paster consists of an upper layer and a lower layer, the lower layer is coupled with the feed through the sleeve-shaped probes, the upper layer is coupled with the feed through the lower radiation paster, the middle is supported by the metal support columns, and the reflection cavity is of a round bowl-shaped structure and higher than the upper radiation paster. The occulting antenna is excellent in performance and structure, simple and reliable in process, wide in frequency band, capable of meeting use requirements of a GPS (global positioning system), BD-2, GALILEO and GLONASS, wide in beam coverage, high in gain, stable in phase center, excellent in axial ratio performance, and applicable to a precise obscuration detection system and other high-precision detection systems.

Broadband filter antenna, includes five layers from top to bottom, The first layer structure comprises a top layer patch structure, the second layer structure comprises a bottom layer patch structure,the third layer structure comprises two folding resonators, the fourth layer structure comprises a large metal formation with a pair of vias, and the fifth layer structure comprises a feeding structure. The invention solves the problem of large plane size and realizes the filtering performance of the antenna. Three reflective zeros are generated by stacked multi-patch resonator to widen the bandwidth of the antenna. The odd mode of the resonator produces the low-end radiation zero, and the coupling between the top and bottom patch structures produces the high-end radiation zero, so as to improve the frequency selectivity of both sides of the working band. By adjusting the impedance ratio of the first part and the second part of the folding resonator, the low-end radiation zero can be adjusted while maintaining the bandwidth. The out-of-band mode is suppressed by using the short-circuit branch loaded on the feeder to improve the out-of-band suppression at the high end of the antenna frequency.

The invention discloses a tri-band integrated antenna. The antenna consists of two parts, namely an L / S radiating unit and an ultra-high frequency (UHF) radiating unit, wherein the L / S radiating unit comprises a plurality of metal sleeve feed probes, an L / S feed network, an upper radiating piece, a lower radiating piece and a reflection chamber; the UHF radiating unit comprises a plurality of spiral lines, a supporting sleeve, a feed connecting part, an UHF feed network and a base; the spiral lines are wound on the supporting sleeve; the bottom ends of the spiral lines are connected with the output port of the UHF feed network through the feed connecting part; and the UHF feed network is arranged in the base. The antenna provided by the invention has high phase centre stability, a compact structure and a small size, and can cover UHF, an L-band and an S-band, and meet the requirements of spaceborne or airborne.

The invention discloses a large mode field diameter and negative refractive index single mode glass fiber. The glass fiber comprises a fiber core, an inner cladding and an outer cladding; the refractive index of the fiber core is N1, the refractive indexes of the inner cladding and the outer cladding are respectively N2 and N3, which satisfy the relation: N2 is more than or equal to N1 and N2> N3; the lumination ion is mixed into the fiber core, which is the lanthanum ion or the combination of one or several transition metal ions; the mixing concentration is more than 1*1019 ions / cm3. The glass fiber of the invention forms the wave guiding structure between the fiber core and the inner cladding under the common function of the plus refractive index and the wave guiding refractive index; the laser oscillates stably in the fiber core. The invention realizes the large mode field diameter single mode laser output in the fiber.

A double-ridged horn antenna having a higher-order mode suppressor includes a pair of upper and lower ridges arranged opposite to each other, each of the upper and lower ridges having an inner surface to guide electromagnetic waves and an outer surface arranged opposite to the inner surface; upper and lower flares fixedly attached to respective outer surfaces of the upper and lower ridges; left and right flares coupled to the upper and lower flares to form a rectangular cone structure; and metal conductors symmetrically positioned between the upper and lower ridges and the left and right flares.

The invention relates to an L-band four-ridge ortho-mode transducer. The ortho-mode transducer is a modified index gradually-changing curve loaded with ridge diaphragms and a coaxial excitation structure, the operating frequency is 1-2GHz, and the ortho-mode transducer is applied to a radio telescope L-band receiver system. The ortho-mode transducer is composed of a circular waveguide, a four-ridge waveguide gradually-changing transformation segment, a four-ridge circular waveguide, ridge diaphragms, a short-circuit back cavity, a first coaxial probe and a second coaxial probe, and is characterized in that the diameter of the circular waveguide is designed according to the lowest operating frequency; the four-ridge waveguide gradually-changing transformation segment selects a modified index gradually-changing type impedance transformation mode so as to ensure transmission from a dominant mode of the four-ridge circular waveguide dominant mode to a dominant mode of the circular waveguide; chamfer modification is performed on the four-ridge cross section inside the four-ridge circular waveguide so as to ensure that a phenomenon of mutual interference between the ridge diaphragms does not occur; and a four-ridge waveguide coaxial transformer adopts a coaxial feed mode, and the short-circuit back cavity thereof selects a conical design. Measurement and simulation results of the ortho-mode transducer in reflection loss and isolation are basically identical, and radio astronomical observation requirements can be met.

The invention discloses a phase shifting unit and an MEMS (micro-electromechanical system) terahertz phase shifter composed of the same, which mainly solve the problems that the existing terahertz phase shifter is overmany in parasitic parameters, strong in process sensitivity, overlarge in driving voltage and the like. The phase shifting unit comprises a substrate, CPW signal line ground wires, grooves, CPW signal lines, an MEMS movable beam and a CPW signal line, wherein the CPW signal line ground wires are arranged at two opposite sides of the substrate, the grooves are arranged at the opposite ends of the CPW signal line ground wires, the CPW signal lines are inserted into the CPW signal line ground wires through the grooves and are provided with open circuit terminals, the two ends of the MEMS movable beam are respectively connected with the CPW signal lines provided with the open circuit terminals, the CPW signal line is arranged on the substrate and is positioned below the MEMS movable beam, one CPW signal line ground wire is provided with a slot communicated with the groove on the CPW signal line ground wire along the length direction of the CPW signal line ground wire, an electrostatic drive offset line is arranged in the slot, one end of the electrostatic drive offset line is connected with the CPW signal lines provided with the open circuit terminals, the other end of the electrostatic drive offset line is connected with an offset electrode positive pole bonding pad, and the CPW signal line and the CPW signal lines provided with the open circuit terminals share the CPW signal line ground wires.

The present invention provided a piezoelectric resonator and its manufacturing method and provided a thickness longitudinal piezoelectric resonator of an energy enclosed type. The piezoelectric resonator 1 is manufactured, provided with a piezoelectric crystal 2 and the 1st and the 2nd vibrating electrodes 3, 4 formed on the both main surface of the piezoelectric crystal 2 and utilizes an energy confinement type thickness-longitudinal vibration mode. In a manufacturing method of the piezoelectric resonator the piezoelectric crystal 2 is used and consists of piezoelectric materials of R and A that satisfy a relation Qe=(C / (R*A) for the target frequency when an average pore diameter is R ([mu]m) and porosity is A(%) for the piezoelectric crystal (here, C is a constant depending on a material constituting the piezoelectric crystal). The invention provided a piezoelectric resonator which an achieve an enough value of a vibration mode response to be used without restriction of kinds of piezoelectric materials, sizes of the piezoelectric crystal and target frequency.

The invention discloses a metal diaphragm slotting loading circular waveguide circular polarizer, and the polarizer comprises a metal diaphragm and a circular waveguide. A metal diaphragm slot is formed in the outer side of the circular waveguide; the metal diaphragm is a stepped metal diaphragm, and the metal diaphragm is inserted into the metal diaphragm slot. According to the invention, the phase difference of the circular polarizer in a wide frequency band can be kept near 90 degrees; the circular waveguide is slotted and loaded with the metal diaphragm, so a high-order mode can be greatlyinhibited, and high-order resonance is avoided; phase adjustment is achieved by adjusting the depth of the metal diaphragm inserted into the circular waveguide, adjustability is good, the structure is simple, the requirement for machining precision is lowered, and machining batch production is easy.

The invention discloses a broadband inserting piece circular polarizer with a bandwidth expanding function, which comprises a common terminal, a port A, a port B and at least two waveguide segments which communicate the common terminal and the port A and further communicate the common terminal and the port B at the same time along the Z direction. According to the invention, a quadruple-ridged waveguide common terminal and laterally loaded metal columns are adopted to expand the bandwidth of the inserting piece circular polarizer and reduce the axial ratio of circular polarization thereof. For example, the technical scheme disclosed by the invention can be used for designing an inserting piece circular polarizer capable of covering all Ka band satellite communication frequency bands ranging from 19.6GHz to 31GHz, and the axial ratio is lower than 1dB in the whole bandwidth. The broadband inserting piece circular polarizer is mainly applied to various microwave, millimeter wave and terahertz wave band mobile communication, satellite communication and radar systems.

The invention discloses a high-isolation large-scale array synthesis power amplifier, which comprises a base and a waveguide cavity formed by the base, wherein multiple stacked cards are arranged in the waveguide cavity; each card comprises an antenna circuit board and at least one amplifier chip arranged on the antenna circuit board; at least one antenna is arranged on the antenna circuit board;the input end and the output end of each amplifier chip are connected with the input end and the output end of one antenna, and an amplification channel is formed; and each amplification channel is arranged in an isolation cavity arranged in the waveguide cavity. The synthesis space can be saved; in a condition of realizing large-scale array synthesis, the overall space of the synthesis power amplifier can be greatly reduced, coupling among the amplifier chips is reduced, high isolation between amplification channels is realized, a high order mode in the cavity is suppressed, the working bandwidth is expanded, and the high-isolation large-scale array synthesis power amplifier can be widely applied to a synthesis amplifier industry.

The invention discloses a 77GHz power monitoring circuit based on a detector. The 77GHz power monitoring circuit comprises a W-band standard waveguide, a waveguide microstrip fin line transition structure, a 50-ohm microstrip line, a parallel coupler, an MMIC attenuator chip, a 50-ohm thin-film resistor, a detector circuit and an operational amplifier circuit. The P1 port and the P2 port of the parallel coupler can be respectively used as input and output or output and input, so that a signal transmission channel during normal work is provided; and the other small part of signals are simultaneously transmitted to a P3 port of the parallel coupler and are sent to a detector circuit to realize power monitoring. The circuit can be cascaded at the input end of a receiver to form a receiver real-time protection circuit and can also be cascaded at the output end of a transmitter to form a transmitter power real-time monitoring circuit, normal work of a transceiving front end is not affected, and performance deterioration of the receiver and the transmitter is avoided.

A duplex communication module of an integrated waveguide isolator comprises a cavity and a cover plate, a concave common channel is formed in the center line of the cavity, a transmitting channel is formed in one side of the common channel, a receiving channel is formed in the other side of the common channel, and the transmitting channel and the receiving channel are both formed in the cavity. The input end of the common channel is communicated with the output end of the transmitting channel, the output end of the common channel is communicated with the input end of the receiving channel, anda transmitting end isolator, a transmitting end low pass and a transmitting end filtering channel which are used for forming a microwave transmitting path are arranged in the transmitting channel. Areceiving end isolator for forming a microwave receiving path, a receiving end low pass and a receiving end filtering channel are arranged in the receiving channel. According to the invention, the isolator and the low-pass filter are arranged in the cavity of the duplexer, so the matching precision between the isolator and the filter can be effectively improved, and the performance loss of the system is reduced.

A precise GNSS directional antenna includes a reflection cavity, a radiation lower patch, a radiation upper patch, four L-shaped metal feed probes, a first supporting column, a second supporting column and a choke groove. The reflection cavity is a hollow cylinder of which a bottom surface is closed, height of the reflection cavity is a little bit lower than the radiation upper patch and higher than the radiation lower patch, the radiation lower patch is higher than the L-shaped metal feed probes and concentrically connected with an inner bottom surface of the reflection cavity by the second supporting column, and the radiation upper patch is concentrically connected with the radiation lower patch by the first supporting column. The four L-shaped metal feed probes are installed on an inner bottom surface of a transmitting cavity and uniformly distributed on same circle. The bottom surface of the reflection cavity is installed on the choke groove, the choke groove is a pyramidal structure, height of four choke rings decreases progressively from the inside to the outside, and each choke ring has equal depth and equal interval. The precise GNSS directional antenna has wider beam coverage capability and strong multi-path interference resistance in low elevation direction, and is suitable for a precise positioning system.

The invention provides a semiconductor laser with an inverse waveguide layer and a manufacturing method thereof. The method comprises the following steps: a substrate, an epitaxial layer, a side opposite waveguide layer, a front cavity surface and a back cavity surface; an epitaxial layer is arranged on the top surface of the substrate. The front cavity surface is arranged on one side of the substrate. The rear cavity surface is arranged on the substrate side of the front cavity face side. The epitaxial layer is provided with a convex strip-shaped oscillation region; at least one side of the two sides of the strip-shaped oscillation region is provided with an inverse waveguide layer. An inverse waveguide layer is disposed on the epitaxial layer. This scheme can suppress the high-order modebetter than the existing mode control technology on both sides of the oscillation region, so as to improve the beam quality and enhance the brightness of the semiconductor laser.

The invention discloses a single-mode optical fiber with a large cross section, which includes a core layer structure and a cladding layer structure. The core layer structure includes two lightly doped SiO2 with unequal radii and semicircular cross sections 2 For the core layer, the planes where the diameters of the two core layers are located and the centers of the cross-sections coincide; the cladding structure is wrapped around the core layer structure, and the outer edge cross-section of the cladding structure is circular, and the center of the circle is the cross-section of the core layer. The centers of the circles coincide, and the cladding structure is heavily doped SiO 2 form. The optical fiber core layer of the invention has a larger cross-sectional area, which is favorable for transmitting high-power single-mode light.

The invention relates to a design method for a high-power high-beam-quality laser. The design method for the high-power high-beam-quality laser includes a pump light source, an optical resonant cavity, an acousto-optic Q-switch, heat sinks, a fan and an Nd: YAG (yttrium aluminium garnet crystal) medium, wherein heat sinks are arranged on the outside of the two parallel mirrors of the optical resonant cavity, and light beams of the pump light source illuminate the receiving surface of the Nd: YAG medium. The design method for the high-power high-beam-quality laser is characterized in that the Nd: YAG medium and the acousto-optic Q-switch are arranged inside the optical resonant cavity, the Nd: YAG medium is in a convex surface flat top shape or a concave surface flat top shape, the receiving surface of the Nd: YAG medium and the plane of symmetry of the receiving surface are planes with an incircle radius no less than 1cm, and the fan cools the Nd: YAG medium. According to the design method for the high-power high-beam-quality laser, the laser changes the appearance of the Nd: YAG medium, restrains the high-order mode produced in an oscillating process, improves the beam quality, increases the degree of laser alignment, and meanwhile increases power by adding an acousto-optic Q-switch.

The present invention aims at providing a circular waveguide polarizer with high performance and low cost. The circular waveguide polarizer is realized by arranging a plurality of side grooves 12 in a side wall of a circular waveguide 11 along the direction of a pipe axis C1 and by appropriately designing the number, spacing, radial depth, circumferential width, length in the pipe axis direction, and the like. According to this circular waveguide polarizer, disturbance is imparted to a section with a coarse electromagnetic field distribution in a transmission mode to create a phase delay, so that the amount of phase delay does not vary largely with a delicate change in width, depth and length of the side grooves 12. That is, there is little deterioration in characteristics caused by a machining error or the like, and hence it becomes possible to effect mass production and cost reductions.

A multimode occulting antenna with a stable phase center comprises a reflection cavity, a lower radiation paster, an upper radiation paster, four feed probe sleeves, four feed probe inner cores and two support columns. Each feed probe sleeve comprises a metal seat and filler, one end of the metal seat is a metal column, the other end of the metal seat is a cylindrical metal cavity, and the filler is used for filling the cylindrical cavity of the metal seat. The sleeve-shaped probes are coupled with feed through four points, probes are uniformly distributed on the circumference, an aerial radiation paster consists of an upper layer and a lower layer, the lower layer is coupled with the feed through the sleeve-shaped probes, the upper layer is coupled with the feed through the lower radiation paster, the middle is supported by the metal support columns, and the reflection cavity is of a round bowl-shaped structure and higher than the upper radiation paster. The occulting antenna is excellent in performance and structure, simple and reliable in process, wide in frequency band, capable of meeting use requirements of a GPS (global positioning system), BD-2, GALILEO and GLONASS, wide in beam coverage, high in gain, stable in phase center, excellent in axial ratio performance, and applicable to a precise obscuration detection system and other high-precision detection systems.

The invention relates to a three-way filter power divider with high selectivity, which comprises a bottom metal ground, a middle dielectric substrate and an upper dielectric substrate successively stacked from bottom to top, and the middle dielectric substrate and the upper dielectric substrate are both penetrated with metallization The via holes are connected to each other; a circular area is etched in the center of the bottom metal ground, the upper end of the SMA head passes through the circular area and connects with the center of the intermediate dielectric substrate, and a resonator unit is printed on the upper surface of the upper dielectric substrate. The bottom metal ground, the middle dielectric substrate and the upper dielectric substrate are coaxial, and are regular hexagons with the same size and phase. The resonator unit is in the shape of a regular hexagon, the center is the first resonator which is an equilateral triangle, and the periphery is the second resonator, the third resonator and the fourth resonator which are isosceles triangles. The three-way filtering power divider of the present invention has a filtering function, and the output signals at each output end have small phase and amplitude differences, high isolation, strong out-of-band suppression performance, and good selectivity.

The invention discloses a tri-band integrated antenna. The antenna consists of two parts, namely an L / S radiating unit and an ultra-high frequency (UHF) radiating unit, wherein the L / S radiating unit comprises a plurality of metal sleeve feed probes, an L / S feed network, an upper radiating piece, a lower radiating piece and a reflection chamber; the UHF radiating unit comprises a plurality of spiral lines, a supporting sleeve, a feed connecting part, an UHF feed network and a base; the spiral lines are wound on the supporting sleeve; the bottom ends of the spiral lines are connected with the output port of the UHF feed network through the feed connecting part; and the UHF feed network is arranged in the base. The antenna provided by the invention has high phase centre stability, a compact structure and a small size, and can cover UHF, an L-band and an S-band, and meet the requirements of spaceborne or airborne.

The invention provides a high-isolation radial power synthesis amplifier with broadband air micro-strips, which comprises a high-isolation radial power divider / synthesizer with broadband air micro-strips and at least one power amplifier module. The high-isolation radial power divider / synthesizer with the broadband air micro-strips comprises an input waveguide, a coaxial transition structure, a radial waveguide, the radial air micro-strips and at least one output waveguide, wherein the coaxial transition structure is arranged between the input waveguide and the radial waveguide, the center of the radial waveguide is connected with the input waveguide through the coaxial probe transition structure, the air micro-strips in radial distribution are connected to the periphery of the radial waveguide, a film resistor disc is pasted between each two adjacent air micro-strips, and each air micro-strip is connected with one output waveguide. The high-isolation radial power synthesis amplifier with the broadband air micro-strips can realize high-efficiency broadband power synthesis with one-division multiplexing and in single-mode operation.

The invention discloses a millimeter wave antenna, an antenna array and electronic equipment. A first circuit board and a second circuit board are respectively arranged on two sides of a wave absorbing layer; the first circuit board comprises a first radiation patch and a first dielectric substrate from top to bottom; the second circuit board comprises a second radiation patch, a second dielectric substrate, a first floor, a third dielectric substrate and a feeder line from top to bottom, and is provided with a signal hole for connecting the second radiation patch and the feeder line; and the through groove is formed in the wave absorbing layer, so that the energy of the second radiation patch can be coupled to the first radiation patch to the maximum extent. The wave absorbing layer is arranged around the radiation patch, so that a high-order mode generated by the floor on the second circuit board can be suppressed, and the cross polarization component of the millimeter wave antenna is reduced; and meanwhile, the millimeter wave antenna is designed in a layered manner through the arrangement of the wave absorbing layer, the number of layers of the circuit board is reduced, the types of via holes are reduced, and the processing cost is further reduced.

The invention discloses a high-isolation large-scale array synthesis power amplifier, which includes a base and a waveguide cavity formed by the base. A plurality of superimposed cards are arranged in the waveguide cavity. The card includes an antenna circuit board and is arranged on the antenna circuit board. At least one amplifier chip, at least one antenna is arranged on the antenna circuit board, the input end and output end of each amplifier chip are respectively connected with the input end and output end of an antenna to form an amplifying channel, and each amplifying channel is located at In an isolation chamber set in the waveguide cavity. The present invention saves the synthesis space, and can greatly reduce the overall space of the synthesis power amplifier in the case of realizing large-scale array synthesis, reduces the coupling between amplifier chips, realizes high isolation between each amplification channel, and suppresses the The high-order mode widens the working bandwidth and can be widely used in the synthesis amplifier industry.

The invention discloses an on-chip high-resolution spectrometer based on an Euler microring resonant cavity. Contains three input / output ports, Euler ring ultra-precision filter, cascaded ring coarse filter, multi-segment connecting waveguide, and detector array. The filtering process is mainly divided into ultra-precision filtering and coarse filtering. For ultra-precision filtering, based on multi-mode silicon optical wide waveguide, we designed an Euler microring resonator with ultra-high quality factor, including two-section wide waveguide and modified Euler The curved wide waveguide of the pull curve, and the input / output coupling area and the output / input coupling area of ​​the Euler ring ultra-precision filter can effectively suppress the excitation of high-order modes. For coarse filtering, a racetrack-type cascaded microring structure is used to construct a higher flat-top filter. The present invention adopts ultra-precise filtering combined with coarse filtering, only needs one scan to obtain complete data, simplifies and improves reliability at the same time, can be plugged and played, and has the advantages of small size, compact structure and high resolution.

The invention relates to an L-band four-ridge orthogonal mode coupler. The orthogonal mode coupler is a modified exponential gradient curve loaded with a ridge membrane and a coaxial excitation structure. The working frequency is 1-2GHz, and it is applied to the L-band reception of radio telescopes. machine system. The orthogonal mode coupler is composed of a circular waveguide, a four-ridge waveguide gradual transition section, a four-ridge circular waveguide, a ridge diaphragm, a short-circuit back cavity, a first coaxial probe and a second coaxial probe. Working frequency design; the modified exponential gradient impedance transformation method is used in the four-ridge waveguide gradual change section to ensure the transmission from the main mode of the four-ridge circular waveguide to the main mode of the circular waveguide; the chamfering correction is performed on the four-ridge section in the four-ridge circular waveguide to ensure There will be no mutual interference between the ridge diaphragms; the four-ridge waveguide coaxial converter adopts the coaxial feeding method, and its short-circuit back cavity adopts a conical design. The measured reflection loss and isolation of the orthogonal mode coupler are basically consistent with the simulated results, which can meet the needs of radio astronomy observations.

A broadband filter antenna, including a five-layer structure from top to bottom, the first layer structure includes a top layer patch structure, the second layer structure includes a bottom layer patch structure, the third layer structure includes two folded resonators, and the fourth layer structure includes The layer structure is a large metal formation with a pair of via holes, and the fifth layer structure includes a feed structure. The present invention solves the problem of large plane size and realizes the filtering performance of the antenna; it uses stacked multi-chips combined with resonators to generate three A reflection zero point to expand the working bandwidth of the antenna; the odd mode of the resonator produces a low-end radiation zero point, and the coupling between the top and bottom patch structures produces a high-end radiation zero point, thereby achieving the effect of improving the frequency selectivity on both sides of the working frequency band; by adjusting The impedance ratio of the first part and the second part of the folded resonator can adjust the low-end radiation zero point under the premise of maintaining the bandwidth; use the short-circuit stub loaded on the feeder to suppress the high-order mode out of the band, so as to improve the high-end antenna frequency purpose of out-of-band suppression.