86 results about "Multiple resonance" patented technology

The invention belongs to the technical field of OLEDs, and provides a polycyclic compound containing triphenyl silicon and a polyalkyl substituent group and an organic electroluminescent device containing the polycyclic compound. The structural general formula of the polycyclic compound is as shown in formula I in the specification. Benzofuran with higher electronegativity is introduced to a ring structure composed of nitrogen atoms and boron atoms, triphenyl silicon is introduced to the para-position of boron, and the synergistic effect of benzofuran and triphenyl silicon can significantly enhance the multiple resonance of a light-emitting core and reduce vibration relaxation. Due to simultaneous use of the benzofuran and the triphenyl silicon, the problems of vibration relaxation increase, spectrum widening and the like caused by introduction of the polyalkyl substituent are remarkably improved, the luminous efficiency of the material is remarkably improved, and the color purity is improved, so that the requirement of BT.2020 wide color gamut display standard on a luminescent spectrum is met. I

According to the cluster sound absorption structure for realizing low-frequency broadband sound absorption through multi-resonance coupling, through the multi-resonance coupling among different resonance units in a resonance unit group, between the resonance unit group and a hole pipe embedded plate above and among different coupling resonance clusters, broadband sound absorption can be realized by using a small number of units, and the structure is lighter, thinner, more compact and more flexible. The sound absorption bandwidth is wider, and the sound absorption performance and the modulation efficiency are remarkably improved.

The present disclosure relates to a kind of direct current transformer, direct current transformer includes: transformer circuit, inverter circuit, rectifier circuit and resonance circuit;The direct current side of inverter circuit is connected with direct current input port, the alternating current side of inverter circuit is connected with the primary side of transformer circuit;The alternating current side of rectifier circuit is connected with the secondary side of transformer circuit, the direct current side of rectifier circuit is connected with direct current output port;Resonance circuit includes multiple resonance modules, the alternating current side of inverter circuit is connected with the alternating current side of rectifier circuit through multiple resonance modules and transformer circuit;Resonance module includes first capacitor, resonance module is used to control the input or cut-out of first capacitor.The present disclosure can simulate the voltage outputted when direct current transformer adopts different capacitance resonant capacitor, so as to ensure that direct current transformer does not need to set resonant capacitor, can satisfy the realization condition of resonant soft switching in different working condition scene, and then make the switching device in inverter circuit and rectifier circuit can realize soft switching.

The application relates to the technical field of elastic wave metamaterials, in particular to an elastic wave strong localization plate beam structure based on gradient coupling. The structure comprises multiple resonance units, a stacking structure and a truncated defect structure; the resonance units are sequentially arranged along a first direction to form scale coupling chains, and the coupling stiffness between adjacent resonance units monotonously changes along the direction according to a geometric scale law; the stacking structure is formed by stacking multiple scale coupling chains along a second direction; the truncated defect structure is located at the right end of the middle layer of the stacking structure, and a local vacancy is formed by removing a resonance unit or a connecting plate at the end of the middle layer, which is used for inducing an enhanced localized state. The gradient coupling mechanism is adopted, the wave function space redistribution effect generated by the geometric scale law is utilized, the elastic wave energy shows stronger localization characteristics at the defect, and the localization degree is significantly better than that of a traditional SSH model. Through the synergistic effect of the gradient coupling and the dislocation-induced defect state, efficient localization enhancement of the elastic wave energy is realized, and the application is suitable for the fields of vibration energy collection, high-sensitivity sensing and elastic wave signal processing.

The invention discloses a control method of a fuel cell power system integrated with online impedance spectroscopy measurement, which belongs to the technical field of fuel cell systems, and comprises the following steps: constructing a mathematical model of the fuel cell power system; designing a closed-loop control strategy and an electrochemical impedance spectroscopy measurement strategy of the fuel cell power system; designing an improved active anti-disturbance controller based on multi-resonance control; a multi-stack system electrochemical impedance spectrum disturbance self-cancellation strategy is introduced, and the design process of the fuel cell power system bus voltage control method based on multi-resonance control is achieved. By adopting the control method of the fuel cell power system integrated with impedance spectrum online measurement, the mutual exclusion limitation of online monitoring and voltage stability is broken through, full-band impedance spectrum continuous acquisition is realized under the condition of continuous normal operation of the system, the bus voltage quality is remarkably improved, and the system reliability is improved. And a key technical support is provided for real-time health diagnosis and active life management of the fuel cell power system.

The invention relates to an aerosol optical tweezer formant track identification method and system based on clustering analysis, belongs to the technical field of spectrum formant identification, and solves the problems that multiple formant tracks are difficult to accurately, completely and automatically identify during aerosol optical tweezer spectrum data analysis in the prior art, and the identification accuracy is high. And the subsequent physical parameter inversion precision is influenced. The method comprises the following steps: acquiring multi-frame aerosol spectral data, extracting candidate formants, and constructing a time-peak position data set; according to the time-peak data set, determining an anchoring trajectory by using a dynamic trajectory tracking algorithm; calculating a relative wavelength difference value corresponding to each candidate formant based on the anchoring trajectory; performing clustering analysis on all relative wavelength differences, and determining candidate formant trajectories; a formant trajectory is determined based on the anchoring trajectory and the candidate formant trajectory. The method achieves the automatic and high-precision recognition and reconstruction of a plurality of formant tracks from the complex noisy spectrum data based on the stable physical constraint of the relative distance between formants.

The invention belongs to the technical field of organic electroluminescent materials, and particularly relates to a boron-nitrogen compound with a naphtho-carbazole structure and an organic electroluminescent device.According to the boron-nitrogen compound with the naphtho-carbazole structure, on the basis of multiple resonance nuclei of boron and nitrogen, novel conjugate extension is constructed, and the structure of the boron-nitrogen compound with the naphtho-carbazole structure is improved; the whole conjugation degree of the structure is increased, so that the structure has a relatively strong rigid conjugation skeleton, the non-radiative transition of excited state energy can be reduced, the relaxation of the excited state structure is inhibited, and the fluorescence quantum efficiency is improved; more importantly, due to the introduced naphtho-carbazole unit, the organic electroluminescent material has better electron and hole double injection capability, so that a host material and a sensitizer material can be better matched, and an OLED device prepared from the organic electroluminescent material has lower driving voltage, higher current efficiency and longer service life.

The application discloses an organic light-emitting material with chiral and narrow-band emission performance, a preparation method and application thereof, and the core is that multiple resonance structures can effectively inhibit the vibration coupling between S1-S0 transition and excited state structure relaxation, form significant narrow-band emission, and simultaneously utilize the axial chirality characteristics of BINOL, utilize a chiral disturbance strategy to form circularly polarized luminescence. The application further provides a preparation method of the material, wherein compound B is obtained by reacting compound C with compound D, and the organic light-emitting material is obtained by reacting compound A with compound B. The material has the characteristics of thermal activated delayed fluorescence induced by multiple resonance effect, and simultaneously has the characteristics of circularly polarized luminescence, and can be applied to the fields of 3D display, molecular probe, spin information, optical data storage and processing and optoelectronic devices, and the like. The synthesis process is simple, raw materials are widely sourced and inexpensive, and the material is suitable for wide application.

The invention provides an IFA-based spurious coupling multi-band antenna and communication equipment. The IFA-based spurious coupling multi-band antenna comprises a base material and an antenna structure, the base material is provided with a feeding point, an antenna foot and a parasitic foot. The antenna structure comprises a connecting arm, a first radiation arm, a second radiation arm and a third radiation arm, wherein the connecting arm, the first radiation arm, the second radiation arm and the third radiation arm are all arranged on a base material; the connecting arm comprises a first connecting part and a second connecting part which are connected with each other. Compared with the prior art, the IFA-based parasitic coupling multi-frequency-band antenna has the advantages that through the multiple radiation arms and the two gaps, the antenna generates multiple resonances, the working frequency band is widened, the antenna efficiency is better, the low-frequency, intermediate-frequency and high-frequency working frequency bands can be covered, and multi-frequency-band full coverage is achieved; under the condition of not increasing the occupied internal space of the communication equipment, the working frequency band is wider, the space occupied by the antenna is very small, and the cost is reduced.

The application provides a luminescent material containing a cyclobutadiene structure, a preparation method and application, and relates to the technical field of organic electroluminescent materials.The luminescent material containing a cyclobutadiene provided by the application is fused to a binary nitrogen-containing fused heterocyclic skeleton by using anti-aromatic cyclobutadiene, the anti-aromatic special electronic structure and high ring tension of the anti-aromatic cyclobutadiene are utilized to inhibit excited state vibration relaxation and realize narrow-band luminescence.By introducing a steric hindrance effect group, the aggregation-induced fluorescence quenching phenomenon between luminescent mother nuclei is weakened, and the fluorescence quantum yield is improved.Different from the current mainstream multiple resonance mechanism, the narrow-spectrum luminescent molecule design provided by the application does not need to depend on the construction of B / N-hetero-fused rings, and the molecular structure can be simplified to realize full-color super-narrow-band luminescence.The application is applied to an organic electroluminescent device, and can realize an electroluminescent spectrum with a super-narrow full width at half maximum and high device efficiency, and provides a better solution for super-high-definition organic light-emitting diode display technology.

The invention relates to the technical field of optics, and discloses a broadband circular polarization terahertz source and application thereof, and the broadband circular polarization terahertz source comprises a free electron beam moving along a predetermined direction and a stacked bianisotropic metasurface located above the free electron beam; wherein the stacked bianisotropic metasurface comprises at least two layers of metal gratings which form a stacked structure; the at least one dielectric plate is used for separating the metal grating; wherein the number of layers of the dielectric plate is one less than that of the metal grating; and the metal grating and the dielectric plate form a periodic structure together, and are used for coupling evanescent wave energy of the free electron beam into multiple resonant modes so as to excite broadband circular polarization terahertz radiation. According to the technical scheme provided by the invention, the tunable and compact terahertz source with high power output can be realized.

Embodiments of the present application provide an electronic device, which includes an antenna using a part of a conductive frame as a radiator, and can produce multiple resonance frequency bands while reducing the opening of the frame gap, so as to meet the communication needs of the electronic device. The electronic device includes a ground plate, a conductive frame and an antenna. The frame has a first position and a second position, the frame is grounded at the first position, the second position is provided with a gap, and the first frame between the first position and the second position serves as a radiator of the antenna. The first frame includes a first grounding point, a first feeding point and a second feeding point, the first feeding point is located between the first grounding point and the first position, the second feeding point is located between the first grounding point and the second position, and the length L1 of the frame between the first position and the first grounding point and the length L2 of the frame between the second position and the first grounding point satisfy: 1.8≤L1 / L2≤2.2.

The application provides a piezoelectric vibration energy collection device with a Z-shaped beam structure, which comprises a piezoelectric energy collection circuit composed of multiple straight beams and piezoelectric layers, and the multiple straight beams in the piezoelectric energy collection circuit are connected in a head-to-tail mode through a wheel disc corner structure, wherein one end of the first straight beam is a fixed end, and the tail end of the last straight beam is a free end. The technical problem of single energy collection frequency band and direction in the prior art is solved. When one end of the Z-shaped beam structure is excited by a vibration source, the straight beams are bent and deformed, the piezoelectric layers are bent and deformed, and thus vibration energy is converted into electric energy. The structure of the application is composed of multiple beams and multiple piezoelectric layers, so that the modal frequency of resonance is concentrated, energy collection under multiple resonance frequencies is realized, and the energy collection efficiency is effectively improved.

The invention relates to an organic compound with the following general formula and an organic electroluminescent device containing the compound. According to the compound disclosed by the invention, a multi-resonance structure is introduced into a parent nucleus indolocarbazole structure, so that narrow-band emission is maintained while light color is adjusted. When the organic compound provided by the invention is used as a luminescent material in an OLED (Organic Light Emitting Diode) device prepared by evaporation, spraying, printing and the like, the organic compound shows good effects of higher external quantum efficiency and longer service life of the device.

The invention relates to the technical field of fan bearing fault diagnosis, in particular to a fan bearing fault online detection method and system, which adopts a weighted combination envelope spectrum technology, quantifies the correlation between fault features and resonance frequency bands through two-dimensional spectrum coherence, and adaptively distributes weights in combination with a frequency domain signal-to-noise ratio. The fault information of multiple resonance frequency bands is aggregated and enhanced, the attenuation influence in the signal transmission process is effectively counteracted, and the problem that signal attenuation distortion is caused due to the fact that enclosure magnetic attraction installation is needed under the limitation of the fan structure size is solved. An order tracking and constant angle increment sampling technology is introduced, a corresponding relation between a vibration signal and a bearing rotation angle is established, a time domain signal is converted into an angular domain signal, a fault characteristic frequency and a rotation speed are decoupled, and it is ensured that theoretical fault frequencies of parts such as an inner ring, an outer ring and a roller are accurately matched with a detection result. Compared with fixed frequency domain analysis of a traditional acceleration enveloping method, the method has the advantage that misjudgment caused by frequency deviation is effectively avoided.

The application discloses a kind of microstrip low-pass filters, including dielectric substrate;Microstrip transmission line, microstrip transmission line is located on the first surface of dielectric substrate;Multiple resonance units, resonance unit is etched on the second surface of dielectric substrate, the second surface is opposite surface with the first surface, multiple resonance units are arranged in logarithmic periodic array on dielectric substrate, and a clamping angle is formed at the vertex of adjacent two resonance units in sawtooth shape.The present application adopts logarithmic periodic sawtooth-shaped defect ground structure, and is arranged as resonance unit on dielectric substrate to form microstrip low-pass filter, by setting the resonance unit of logarithmic periodic array arrangement in sawtooth shape, so that the insertion loss of filter in passband is low, and the filter has the characteristics of high performance, wide stopband, good return loss and low insertion loss, etc.

The application belongs to the technical field of organic electroluminescent materials, and particularly relates to a multiple resonance thermally activated delayed fluorescence compound, and simultaneously relates to a thermally activated delayed fluorescence material containing the compound, an organic electroluminescent device, and application of the compound, the material and the device in the field of display and illumination. The multiple resonance thermally activated delayed fluorescence compound provided by the application takes a naphthoindolocarbazole fused ring unit as a strong donor, takes a B atom as a core electron-withdrawing unit, constructs a rigid MR conjugated skeleton with N-B alternately arranged, effectively reduces the optical band gap of the material through the strong electron-donating ability of the fused ring donor, and realizes red light band emission. Meanwhile, based on the multiple resonance effect, narrow-band red light emission is realized, and the color purity is excellent, which can fully meet the stringent requirements of the red light color gamut of the ultra-high-definition display BT.2020 standard.

The present application relates to a kind of compound and its application, and organic electroluminescent device comprising the compound, the compound has the following structure, wherein, Z1 and Z2 are not connected, connected by single bond or connected by chemical bond to form ring A, Z3 and Z4 are not connected, connected by single bond or connected by chemical bond to form ring B, the ring A, ring B each independently selected from one of unsubstituted or R' substituted C6-C60 aryl, unsubstituted or R' substituted C3-C60 heteroaryl, R 11 Single substituent represents the maximum allowable number of substituent groups. The device prepared by using the compound of the present application can achieve higher external quantum efficiency, lower turn-on voltage, narrower half-peak width of red light emission and stable device performance. The present application will continue to promote the development of future high light efficiency, high stability, full light color multiple resonance materials and devices.

The invention relates to a dual-mode acoustic wave filter and filtering device based on surface acoustic waves, the dual-mode acoustic wave filter comprises reflectors and a plurality of IDTs arranged between the reflectors, and each IDT is arranged along the propagation direction of the surface acoustic waves; each IDT comprises a plurality of spacing intervals, and each spacing interval is provided with interdigitals which are arranged along the propagation direction of the surface acoustic wave and are sequentially connected end to end; wherein each IDT comprises a main interval area and a plurality of interval adjusting areas, the intervals of the interdigitals in the main interval area are consistent, the intervals of the adjacent interdigitals in each interval adjusting area monotonically change in the direction away from the main interval area in the form of a third power function, and the variation amplitudes of the intervals of the adjacent interdigitals in different interval adjusting areas are different. By adjusting the distance between the interdigitals one by one, the design freedom degree is remarkably improved, multiple resonance modes are constructed in a passband, the bandwidth expansion capability is improved, the insertion loss is reduced, the tuning freedom degree of the device is enhanced, the device can adapt to different use scenes, and the application range is widened.

The application discloses a sound absorption device and a noise reduction equipment, and relates to the technical field of sound absorption, so as to realize effective sound absorption of each resonance sound absorption point in the frequency band range from low frequency to high frequency, realize effective sound absorption of multiple resonance frequencies, reduce sound absorption fault and make the sound absorption effect have wide frequency. The sound absorption device comprises a perforated plate and a sound absorption back cavity. The sound absorption back cavity has an opening, the perforated plate is arranged at the opening, the aperture of the perforated plate is less than 0.1 mm, and the sound absorption back cavity has a plurality of resonance cavities in communication with the opening. The noise reduction equipment comprises the sound absorption device. The sound absorption device provided by the application is used in noise reduction.

The application discloses a double-wideband substrate integrated waveguide back cavity slot antenna, which comprises a circular dielectric substrate, the upper layer and the lower layer of the dielectric substrate are respectively covered with a first metal layer and a second metal layer; the outer ring of an antenna unit is provided with a plurality of metalized through holes, so that the antenna unit forms a substrate integrated waveguide structure; the center of the first metal layer and the second metal layer is provided with a feed hole for a feed probe; a plurality of metalized short-circuit through holes are formed on the first metal layer with the feed hole as the center and the circumference; a plurality of slits with different shapes are formed on the first metal layer, and the metalized short-circuit through holes are located between the slits. The application can significantly improve the bandwidth of the antenna by fusing multiple resonance modes of the substrate integrated waveguide, and can improve the antenna gain while obtaining the wideband performance by optimizing the structure of the radiation slot of the substrate integrated waveguide back cavity slot antenna.

The utility model discloses an air guide ring, a panel assembly, an air conditioner outdoor unit and an air conditioner, and relates to the technical field of air conditioners, the air guide ring comprises a first shell part and a second shell part, the first shell part comprises an air duct wall, the air duct wall defines an air duct, and the air duct wall is provided with a plurality of communicating holes; the second shell part is arranged on the first shell part, a plurality of resonant cavities are defined by the second shell part and the first shell part, the resonant cavities are located on the side, away from the air duct, of the air duct wall, and one resonant cavity communicates with the air duct through at least one communicating hole. According to the technical scheme, the noise reduction and sound absorption capacity of the air guide ring can be improved.

The invention discloses a multi-mode adjustable intelligent shock absorber based on an acoustic superstructure and a control method, and belongs to the technical field of vibration and noise control. The structure comprises a base body structure, resonance units and an intelligent control system for regulating and controlling the working mode of each resonance unit. The resonance unit is a key structure for generating a band gap. The intelligent control system comprises a sensor, a controller and an actuator; the sensor monitors the vibration state of the structure in real time and transmits a signal to the controller; the controller generates a control instruction according to a built-in algorithm, and drives the actuator to dynamically change the connection mode of the resonant unit, so that the resonant frequency of the resonant unit shifts, and switching of working modes is realized. Through a semi-active control strategy, a plurality of resonance units are cooperatively regulated and controlled, so that the vibration reduction band gap of the structure can move or be widened in a frequency domain, the vibration reduction structure effectively adapts to the change of external excitation frequency, the defect that the band gap of a traditional acoustic metamaterial is fixed is overcome, and the self-adaptive vibration reduction performance in a broadband range is remarkably improved.

A kind of based on multi-dimension under quasi-BIC mediation terahertz regulating device, including substrate layer and multiple resonance rings, substrate layer surface is coated with photosensitive germanium layer, multiple resonance rings are arranged on photosensitive germanium layer, resonance ring includes mutually parallel and equal length first metal strip and second metal strip, the central position of first metal strip and second metal strip is connected by intermediate arm perpendicular to both, the end surface of first metal strip is vertically connected with the side arm extending towards second metal strip, the end surface of second metal strip is provided with the corresponding part corresponding with side arm and extending towards side arm, there is always gap between corresponding part end and side arm end, corresponding part length and side arm length are not equal and the sum of both is always equal to 86 μm;Or the end surface of second metal strip has no corresponding part, there is gap between side wall and second metal strip end and the length of side arm is equal to 86 μm, the present application, improves the flexibility of application and application flexibility.

The invention discloses an anthryl compound of a spiro-coupled boron-nitrogen multi-resonance skeleton, an organic electroluminescent device, a display screen and electronic equipment, and relates to the technical field of organic electroluminescent materials. The anthryl compound provided by the invention has a structure as shown in a formula A. A boron-nitrogen heteromultiple resonance skeleton and an anthryl group are introduced into a spiro skeleton, and through the exciton characteristic of the anthracene group, a triplet state-triplet state up-conversion process is utilized, so that the exciton utilization rate of a light-emitting core is improved, triplet state exciton accumulation is reduced, and the service life of a blue light organic light-emitting device based on the anthryl compound is prolonged.

The present application relates to the technical field of fan bearing fault diagnosis, in particular to a fan bearing fault online detection method and system, adopting a weighted combination envelope spectrum technology, quantifying the correlation of fault characteristics and resonance frequency bands through two-dimensional spectrum coherence, combining the frequency domain signal-to-noise ratio to adaptively assign weights, aggregating and enhancing the fault information of multiple resonance frequency bands, effectively offsetting the attenuation effect in the signal transmission process, solving the problem of signal attenuation distortion caused by magnetic attraction installation through the machine shell under the limitation of fan structure size. The order tracking and constant angle increment sampling technology is introduced, the corresponding relationship between the vibration signal and the bearing rotation angle is established, the time domain signal is converted into the angle domain signal, the fault characteristic frequency and the rotating speed are decoupled, the theoretical fault frequency of the inner ring, the outer ring, the roller and other components is accurately matched with the detection result, the detection adaptability under variable working conditions is greatly improved, compared with the fixed frequency domain analysis of the traditional acceleration envelope method, the misjudgment caused by frequency offset is effectively avoided.

The invention discloses a nasal flute capable of changing timbre by forming an adjustable resonance body through a semi-open structure, and relates to the technical field of musical instruments. The flute comprises a flute body 1 and at least one semi-open adjustable resonance body 2 arranged on the flute body 1. The flute body is provided with a mouthpiece 3 and a whistle mouth 4. The semi-open adjustable resonance body 2 is of a structure which protrudes outwards from the surface of the flute body 1 and can enclose or independently form a semi-open resonance cavity with the hand of a player. When a player plays, air flow passes through the whistle mouth 4 to give out edge sound, and meanwhile, the semi-open adjustable resonance body 2 participates in resonance to form a multiple resonance body; a player can adjust the effective volume of the resonance body in real time by changing the enclosing state of the hand and the semi-open resonance structure or opening and closing of a tuning pressing hole 6 and a tuning seam 5 arranged on the semi-open resonance structure, and dynamic changes of tone and intonation are achieved. According to the nasal flute, the holding structure and the sound cavity adjusting function are integrally designed, so that the nasal flute is rich and adjustable in timbre, comfortable to hold, visual to operate and attractive in appearance.

The invention provides an organic compound and an organic electroluminescent device comprising the same, the organic compound has a structure as shown in a formula I. Through the design and combined action of a boron-nitrogen multiple resonance structure, a ring F and a group RX, the organic compound keeps the narrow emission spectrum and high luminous efficiency of a multiple resonance material, and the organic electroluminescent device has a wide application prospect. The organic electroluminescent material can adjust light color, reduce triplet state energy level, improve efficiency roll-off and lifetime attenuation, inhibit intermolecular pi-pi accumulation, and reduce sublimation temperature. The organic compound has a narrow spectrum characteristic, excellent electroluminescent performance and relatively low sublimation temperature, is used for the organic electroluminescent device, is suitable for being used as a doping material of a luminescent layer, and can effectively improve the luminous efficiency and color purity of the device, prolong the service life of the device, reduce the voltage and comprehensively improve the luminous effect.

The application discloses a narrow-band blue light molecule and a preparation method and application thereof. The application introduces two donor units into a fluorene skeleton, forms a dislocation structure with a multiple resonance unit in space, and regulates the strength of the space charge transfer. On one hand, the reverse intersystem crossing rate can be improved to improve the performance and efficiency of a device. On the other hand, the high-efficiency light emission of the narrow-band is maintained. The application further discloses a preparation method and application of the material. The narrow-band blue light molecule can be used as a novel light-emitting molecule with high performance, high color purity and high quantum efficiency. The narrow-band blue light molecule has great application potential in the preparation of light-emitting materials, light-emitting devices and electronic technology, and has a bright prospect in the field of display technology and solid-state lighting.

The invention provides an antenna and electronic equipment, and the antenna comprises a radiation branch, the first end of the radiation branch is grounded, the second end is a free end, the radiation branch comprises a feeding point and a matching point, the matching point is located between the feeding point and the first end, the matching point is connected with a grounded oscillation circuit, and the feeding point is connected with a feeding circuit. And the feed circuit excites the radiation branch knot to generate resonance in low-frequency and medium-high-frequency bands. According to the embodiment of the invention, the grounded oscillation circuit can excite a plurality of resonance modes of the antenna, thereby widening the bandwidth of the antenna, enabling the antenna to cover low-frequency and medium-high-frequency bands at the same time, reducing the size of the antenna, not needing a tuning switch for frequency band switching, and reducing the cost and design difficulty.