126results about How to "Working bandwidth" patented technology

The invention provides a double-frequency common-caliber base station antenna array which comprises a high-frequency array fixed on a metal reflecting plate and a low-frequency antenna unit located in the middle of the high-frequency array. A low-frequency radiation unit in the low-frequency antenna unit is composed of two groups of mutually crossed low-frequency dipole arms, each low-frequency dipole arm is composed of two quadrilateral or hexagonal metal rings, and the positions of four notches formed in the metal rings are inwards connected with composite decoupling structures respectively; and the low-frequency radiation unit is arranged above the high-frequency array and partially coincides with the projection of the high-frequency array on the reflecting plate. The composite decoupling structure can induce high-frequency induction current on the low-frequency dipole arms to achieve reverse offset in a wide frequency band, interference of the low-frequency radiation unit on high-frequency electromagnetic waves is reduced, a good high-frequency directional diagram shape preserving effect is achieved, the low-frequency dipole arms are printed on the dielectric substrate, the structure is simple, and the antenna is convenient to manufacture. And meanwhile, the current path of the low-frequency radiation unit is prolonged by the composite decoupling structure, and miniaturization is realized.

The invention relates to a wide-frequency-band common-caliber base station antenna array based on a composite wave-transparent structure, and belongs to the field of base station array antennas in the mobile communication technology. Comprising a low-frequency antenna, a high-frequency antenna and a metal floor, the low-frequency antenna is located above the high-frequency antenna, and the orthographic projection of the low-frequency antenna and the orthographic projection of the high-frequency antenna are partially or completely overlapped on the metal floor; the low-frequency antenna is composed of three layers of composite wave-transparent structures, and when high-frequency electromagnetic waves irradiate the composite wave-transparent structures of the low-frequency antenna, the composite wave-transparent structures are excited to form a mixed wave-transparent structure; two or more resonance points can be introduced into the mixed wave-transparent structure, so that a broadband transmission window is further introduced, and the shielding effect on a high-frequency antenna caused by a low-frequency antenna is inhibited. The broadband common-caliber base station array antenna can work in two broadband working frequency bands, unit directional diagrams of the two frequency bands in the array are kept stable, and the broadband common-caliber base station array antenna has the advantages of being simple in structure, easy and convenient to design, capable of achieving array arrangement conveniently, low in interference and the like.

The invention discloses a dual circularly polarized common aperture phased array antenna applied to low orbit satellite communication, comprising M * N antenna array sub-arrays, the M * N antenna array sub-arrays are uniformly distributed in M rows and N columns, each antenna array sub-array comprises four antenna units, the four antenna units are uniformly distributed in 2 rows and 2 columns, any antenna unit can completely coincide with the other three antenna units when rotating by a certain angle with the central axis of the antenna array sub-array as the rotating axis, and the first antenna unit comprises a combined radiation layer, a first copper plate, a coupler layer and a second copper plate which are arranged from top to bottom. The coupler layer adopts an orthogonal coupler realized based on a short-circuit three-branch structure to convert an external radio-frequency signal into two radio-frequency signals with a phase difference of 90 degrees, and the two radio-frequency signals are transmitted to the combined radiation layer; the combined radiation layer adopts a linear dipole radiator with separated upper and lower parts to realize broadband design; the broadband wide-angle scanning device has the advantages of being capable of achieving wide-angle scanning, wide in frequency band, simple in overall structure and low in manufacturing cost.

The utility model provides a reflection type polarization rotator which comprises a reflection bottom plate, a dielectric layer and a metal patch, the reflection bottom plate is used for reflecting electromagnetic waves, the dielectric layer is arranged on the upper surface of the reflection bottom plate, the metal patch is arranged on the upper surface of the dielectric layer, and the horizontal section of the metal patch is of a structure shaped like a Chinese character'wang '. And the center line of the structure shaped like the Chinese character'wang 'is inclined to the horizontal polarization direction and the vertical polarization direction. The reflection type polarization rotator provided by the utility model has wider working bandwidth and higher polarization conversion efficiency, and is simple in structure and more convenient to process and apply.

The invention provides an ultra-wide-band wide-scanning-angle planar tight coupling array antenna. The antenna comprises a plurality of antenna units which are periodically arranged; the antenna unit comprises a coating layer, a radiation layer, a wave absorbing layer and a metal floor which are sequentially arranged from top to bottom and are not in contact; the radiation layer comprises a radiation layer dielectric plate, and a radiation patch and a coupling patch which are printed on the upper surface and the lower surface of the radiation layer dielectric plate; the radiation patch adopts an interdigital dual-polarization dipole structure; the coupling patch consists of a circular metal patch and four quasi-isosceles trapezoid metal patches which are spliced on the circumference of the circular metal patch and are uniformly distributed; the wave-absorbing layer comprises a wave-absorbing layer dielectric plate and an annular thin-film resistor printed on the upper surface of the wave-absorbing layer dielectric plate. The coupling patch can increase the coupling capacitance between the dipoles so as to offset inductive reactance introduced by the floor and suppress resonance points in a frequency band, and the thin-film resistor in the wave absorbing layer can convert energy of incident electromagnetic waves into heat energy, so that the energy is dissipated and attenuated, the resonance points in the frequency band are suppressed, and the working bandwidth is widened.

The invention discloses an opposite-feed waveguide antenna array unit and a waveguide antenna array. The opposite-feed waveguide antenna array unit comprises a 180-degree E-plane power divider, a first E-plane feeder, a second E-plane feeder, a first E-plane-H-plane waveguide converter, a second E-plane-H-plane waveguide converter, an H-plane waveguide and a radiation slot array. The differential feed and equant feed scheme has the advantages of wide working bandwidth, symmetrical directional diagrams, flexible change of the physical aperture of the antenna and the like, the problem of more pain points can be solved, the feed network of feed is more compact by optimizing impedance matching, the scheme has a larger application scene, and in the aspect of implementation, the application range of the antenna is widened. The antenna can be realized by welding after two layers of injection molding parts are metalized, and can also be realized by metalizing the same layer of injection molding parts and one layer of thin copper sheet, so that the thickness of the antenna can be obviously reduced.

The invention discloses a broadband reflection amplification circuit design method based on a real frequency matching method, which comprises the following steps: firstly designing a reflection amplification circuit, designing a real frequency matching network based on the real frequency matching method, and finally inserting the real frequency matching network into the input end of the reflection amplification circuit to construct the broadband reflection amplification circuit based on the real frequency matching method. According to the method, the input impedance of the reverse amplification circuit is tested through the load traction technology, then the parameter characteristics of the matching network are calculated through the optimization algorithm, and finally the structure and parameter values of the matching network are obtained through the circuit synthesis method, so that the method is not limited by a specific matching network architecture, the performance of the matching network can be greatly improved, and the reliability of the matching network is improved. The problem of broadband matching between the transmitting-receiving antenna and the reflection amplification circuit is solved, so that the reflection amplification circuit can realize high gain under different input powers and input frequencies, the working bandwidth of the reflection amplification circuit is expanded, and the purpose of expanding the application scene of the reflection amplification circuit is achieved.

The invention relates to the technical field of radio frequency microwaves, and provides a broadband hybrid ring coupler which comprises a substrate, and the substrate is provided with a first radio frequency component, a second radio frequency component, a fourth radio frequency component, a first inverting transformer and a third radio frequency component. The first radio frequency component, the second radio frequency component, the fourth radio frequency component, the first inverting transformer and the third radio frequency component are sequentially connected to form a ring; the first anti-phase transformer comprises a first inductor and a second inductor, one end of the first inductor is connected with one end of the fourth radio frequency component, one end of the second inductor is connected with one end of the third radio frequency component, and the other end of the first inductor is connected with the other end of the second inductor and then is grounded. Compared with a traditional hybrid ring coupler, the hybrid ring coupler has the advantages that the size of a circuit is reduced, the design difficulty is simplified, and the working bandwidth of the circuit is effectively widened.

The utility model discloses an ultra wide band multichannel transmit-receive system, comprising a radio frequency transmit-receive channel assembly, a local oscillator power division network, a local oscillator module and a control module. The local oscillator power division network is used for distributing local oscillator signals generated by the local oscillator module to the radio frequency transmit-receive channel assembly. The radio frequency transceiving channel assembly comprises a plurality of radio frequency receiving channels and radio frequency transmitting channels, and the positions of power input ends and control signal input ends of active devices of the radio frequency receiving channels and the radio frequency transmitting channels are kept consistent; the control module is connected with the radio frequency receiving channel and the radio frequency transmitting channel through a vertical interconnection structure. According to the utility model, a plurality of transmitting channel modules, a plurality of receiving channel modules or a combination form of a plurality of transmitting channel modules and a plurality of receiving channel modules can be obtained through random combination, thereby effectively solving the interchangeability of the multi-channel transceiver module, realizing the miniaturization of the product, and having better practicability.

The invention discloses an ultra-wideband reconfigurable injection-locking multi-mode single-ended input / output frequency divider circuit, which comprises an input unit, a frequency dividing circuit connected with the input unit and an output unit connected with the frequency dividing circuit, and is characterized in that the frequency dividing circuit comprises an injection-locking two-half frequency dividing circuit and an injection-locking three-half frequency dividing circuit; the input unit uses a Balun structure circuit to enable the injection locking frequency-halving circuit and the injection locking frequency-tripling circuit to be the same single-end input, and the output unit uses a Multi-tank resonance network structure to realize single-end output of two frequency-tripling and frequency-tripling modes. In the design of the broadband millimeter wave phase-locked loop chip, better efficacy and ultra-wideband performance can be realized, the cost is lower, and the integration is easy.

The invention discloses a broadband 1-bit reconfigurable circularly-polarized reflective array antenna based on a multi-resonant structure. The broadband 1-bit reconfigurable circularly-polarized reflective array antenna comprises a reconfigurable circularly-polarized reflective functional layer, a circularly-polarized horn antenna and an acrylic support. The reconfigurable circular polarization reflection function layer is formed by periodically arranging M * N circular polarization reflection array antenna units with the same structure according to the interval of 0.4125 lambda 0. The circularly polarized reflective array antenna unit is composed of a radiation layer and a direct current bias layer, the radiation layer comprises a circuit pattern designed based on a multi-resonant structure, a PIN diode, a radiation dielectric layer and a reflection bottom plate, and the direct current bias structure comprises a direct current bias dielectric layer and a direct current bias circuit. 1-bit regulation and control of unit reflection phases can be realized by controlling the on-off states of the four PIN diodes, a + / -60-degree beam scanning function can be realized by adjusting the state of each circularly polarized reflective array antenna unit, and the circularly polarized reflective array antenna can be applied to wireless communication and satellite communication systems.

The invention discloses a terahertz broadband frequency multiplier structure based on a gap waveguide, and belongs to the technical field of terahertz frequency multiplication. A microwave signal is fed in from the input end of the broadband frequency multiplier and is input into the nonlinear diode through the low-pass filter, the microwave signal excites the nonlinear diode to generate harmonic waves, and the terahertz signal is selectively output through the high-pass filter and is transmitted to the output port. The terahertz broadband frequency multiplier based on the gap waveguide designed by the invention is wider in working bandwidth and easy to dissipate heat, can effectively avoid the problem that power continuity between spliced frequency bands needs to be considered in frequency band splicing in a terahertz broadband system, and can effectively reduce the complexity of a high-frequency terahertz frequency multiplication link.

The invention provides an antenna module and electronic equipment. The antenna module comprises a radiation part, a feed part and a metal ground. The radiation part comprises a base body and a metasurface antenna layer arranged on the base body, the feed part comprises at least one dielectric layer and a feed structure arranged on the dielectric layer, the feed structure is conductively connected with the metasurface antenna layer, and the radiation part and the feed part are stacked. The metal ground is arranged on the bottom side surface of the feed part back to the radiation part. The radiation part of the antenna module comprises the metasurface antenna layer arranged on the substrate, and the metasurface antenna layer is matched with the substrate and the feed part, so that a plurality of resonance modes can be combined together, the working bandwidth of the antenna module is expanded, the dielectric constant of the substrate is equivalently increased, and the profile height of the antenna is reduced.

The invention provides a substrate integrated trapped wave mirror image dielectric waveguide S-shaped circularly polarized antenna, which belongs to the field of antennas and comprises an S-shaped dielectric radiator, a metalized through hole, a microstrip feeder line, a first metal grounding plate, a first dielectric substrate, a second metal grounding plate and a second dielectric substrate, the S-shaped dielectric radiator is embedded in the first dielectric substrate and located in the center of the antenna, the lower surface of the S-shaped dielectric radiator is tightly attached to the second metal grounding plate, the upper surface of the S-shaped dielectric radiator is not covered, a plurality of metalized through holes penetrate through the first dielectric substrate and are arranged on the periphery of the S-shaped dielectric radiator in an array mode, and a gap is formed in the second metal grounding plate. The microstrip feeder is located on the lower surface of the second dielectric substrate and is perpendicular to the gap. The end, away from the gap, of the microstrip feeder is connected to a feed port in the second dielectric substrate. Circular polarization is easy to realize by combining the bent dielectric structure with the slot coupling feed at the bottom, and the radiation efficiency of the antenna is improved by using the notch mirror image structure in the antenna design.

The invention belongs to the technical field of microwave antennas, and particularly provides a tight coupling phased array with a tail end unit loaded with asymmetric dipoles. The main structure of the antenna comprises a radiation structure (I) which is composed of frequency selection surfaces which are arranged above folded dipoles and are periodically arranged, dipoles which are symmetrically arranged in a central unit and dipoles which are asymmetrically arranged in an edge unit; and the feed structure II is composed of a gradient microstrip feeder line, a metal floor and a coaxial line. According to the invention, a frequency selective surface is loaded above a folded dipole, a traditional tight coupling phased array is replaced, a heavy dielectric layer is loaded above the dipole, and a 1 * 8 one-dimensional linear array is designed. Besides, by prolonging the length of the folded dipole on the tail end array element, compared with a traditional structure, extra capacitance is introduced under the condition that the height of the array section is not changed, and the problem that the array is difficult to match at low frequency is effectively relieved.

This application provides a dual-polarized differential base station antenna, relating to the field of communication technology. The dual-polarized differential base station antenna includes a dielectric substrate, a first resonant cavity, multiple second resonant cavity groups, a coupling component, and a coaxial feed conductor. The first resonant cavity is disposed inside the dielectric substrate and extends to the upper and lower surfaces of the substrate. A first radiation slot is provided on the upper surface of the first resonant cavity. Multiple second resonant cavity groups are symmetrically distributed around the first resonant cavity. Each second resonant cavity group includes at least one second resonant cavity, and a second radiation slot is provided on the upper surface of each second resonant cavity. The coupling component connects the first resonant cavity to each second resonant cavity group. The coaxial feed conductor is connected to a ground plane and penetrates the dielectric substrate to connect to the upper surface of the first resonant cavity. The dual-polarized differential base station antenna of this application achieves high gain, high isolation, and wide bandwidth performance while maintaining a low profile structure.

The invention discloses a broadband filtering dipole antenna based on characteristic mode cancellation, and belongs to the technical field of antennas. The antenna comprises a radiation structure, a feed structure and a dielectric substrate, the radiation structure comprises a dipole narrow arm, a dipole wide arm and a folded dipole arm, a coaxial line feed mode is adopted, and a coaxial line core line and a sheath are connected with the dipole narrow arm and the dipole wide arm respectively. The broadband characteristic of the antenna is realized through simultaneous resonance of a dipole first-order mode, a folded dipole first-order mode and a folded dipole third-order mode; besides a working frequency band, a dipole first-order mode is utilized to cancel characteristic modes between a folded dipole first-order mode and a folded dipole third-order mode, frequency points with the surface current being the minimum value are obtained at low frequency and high frequency, then a radiation zero point is obtained, and the antenna has the broadband and filtering characteristics and has the advantages of being simple in structure, wide in working bandwidth, low in cost and the like. And the filtering characteristic is good.

This invention proposes a dual-channel hexagonal lattice photonic crystal non-volatile optical switch based on resistive switching effect. It includes a photonic crystal waveguide with a TE bandgap, disposed on a photonic crystal. Several silicon dielectric pillars are arranged on the photonic crystal, with the waveguide positioned between them. The input waveguide has an input port, and the output waveguide has two output ports with opposite directions. A resonant cavity is located between the input port and the two output ports. A defective dielectric pillar is located within the resonant cavity, with electrodes coated with electrochemical metal at both ends. These electrodes are connected to a bias circuit. Due to the resistive switching effect, when a voltage is applied across the defective dielectric pillar, conductive filaments are formed inside, thereby adjusting the resonant frequency of the resonant cavity and controlling the switching of the signal light. This invention is easy to array, has a small structure size, fast switching time response, high optical transmission efficiency, and is non-volatile.

The present invention relates to a space electromagnetic energy collection system based on a planar logarithmic periodic antenna, and belongs to the field of electromagnetic technology. The system includes an improved planar logarithmic periodic antenna, an impedance matching rectifier unit and a power management unit; wherein the improved planar logarithmic periodic antenna is used to receive radio frequency signals in the 0.5GHz-3GHz frequency band in the environment; the impedance matching rectifier unit is connected to the improved planar logarithmic periodic antenna, wherein the impedance matching part realizes the maximum acquisition of the received signal, ensures that each link of the system maintains a standard impedance of 50 ohms, and the rectifier and filter part is composed of a transmission line, a fan-shaped branch and a diode rectifier array, and performs "signal-energy" conversion; the present invention improves the electromagnetic energy collection efficiency, can effectively extend the standby time of the Internet of Things terminal, and can solve the self-power supply problem of the ultra-low power consumption Internet of Things terminal, and has broad application prospects in the field of the Internet of Things.

The invention provides a long-wave and very-long-wave infrared all-silicon anti-reflection metasurface forming method and system. The method comprises the steps that S1, optical information of a high-purity silicon material is collected; s2, solving a complex refractive index parameter of the high-purity silicon material according to the optical information; s3, establishing a metasurface model according to the complex refractive index parameters; s4, obtaining a reflectivity curve of the high-purity silicon column structure based on the metasurface model; s5, obtaining the average reflectivity according to the reflectivity curve, and selecting the corresponding physical parameters of the high-purity silicon column structure under the condition that the average reflectivity is minimum; periodically arranging the physical parameters on a high-purity silicon substrate so as to form a target metasurface; the high-purity silicon column structure provided by the invention and the high-purity silicon substrate are made of the same material, so that the problems of thermal stress mismatch and easy falling caused by introduction of a new material are avoided, and the high-purity silicon column structure can be adapted to detectors working at normal temperature and low temperature.

The present invention discloses a design and optimization method for an ultra-wide bandwidth oblique incident angle absorber, which significantly expands the working bandwidth of the absorber by using a multi-layer periodic structure. The absorber can simultaneously meet the conditions of normal incidence, TE polarization preset angle and TM polarization preset angle within a preset working bandwidth, that is, achieve ultra-wideband and oblique incident angle. The optimization method includes: modeling a periodic lossy square ring, using equivalent circuit theory to establish a mathematical model of the absorber, the model can calculate the reflection coefficient of the absorber under oblique incident conditions, and based on a genetic algorithm, a global optimal search is performed on the working bandwidth of the absorber to obtain the initial optimal value of the unknown parameter, and the initial value of the parameter is optimized by full-wave simulation to determine the final parameters of the absorber, and the design of the absorber is completed. This can significantly improve the design efficiency of the absorber, so that the performance of the absorber in ultra-wideband and wide incident angle can meet actual needs.

The present invention provides a surface acoustic wave ridge waveguide and an integrated device based on an aluminum nitride film. The surface acoustic wave waveguide of the present invention comprises at least a substrate and a piezoelectric film, wherein the piezoelectric film is arranged on the substrate, the width of the piezoelectric film is not less than the thickness of the piezoelectric film; the piezoelectric film comprises a piezoelectric material; and the piezoelectric film further comprises a ridge structure. The surface acoustic wave waveguide of the present invention presents approximately isotropy within the plane, and when the extension direction of the piezoelectric film is bent at an angle, it can ensure that the conduction mode of the surface acoustic wave does not change substantially, thereby reducing the conduction loss of the surface acoustic wave. The surface acoustic wave waveguide of the present invention is more conducive to obtaining a high-performance integrated acoustic circuit, and is preferably used to prepare basic components of integrated acoustic circuits such as SAW beam splitters and ring resonators.

The invention discloses a heterogeneous photonic crystal fiber for visible light and near-infrared bands, and relates to the technical field of optical fiber communication. The optical fiber comprises an outer cladding layer, a left middle layer, a right middle layer, a left fiber core area and a right fiber core area, wherein a first air hole matrix is arranged in the outer cladding layer. According to the invention, the working bandwidth of the single photonic crystal fiber is expanded, the optimal working bandwidth range of the right fiber core area working at a short wavelength covers a complete visible light wave band, the transmission requirement of the optical fiber for a high-energy wave band can be met, and the transmission requirement of the optical fiber for a left fiber core area working at a long wavelength can be met. The optimal working bandwidth covers the near-infrared band and comprises 1.55 [mu] m wavelength which is most commonly used in communication related services, and the working bandwidth can well meet the requirements of communication services, transmission of near-infrared band optical signals safe to human eyes and research requirements of near-infrared band nonlinear optics.

A high-gain beamforming anti-interference antenna is provided, comprising an antenna cover, a power divider and a metal support tube are provided at the bottom of the antenna cover, and the power divider is connected to the bottom of the metal support tube; a plurality of radiator units are arranged in a coaxial array along the axial direction of the metal support tube, and the plurality of radiator units are connected in parallel with the power divider through their respective corresponding coaxial cables for feeding; the lengths of the coaxial cables are different; each radiator unit is composed of a first vibrator and a second vibrator; and filling materials are provided in the metal shells of the first vibrator and the second vibrator, respectively. The present invention greatly improves the antenna gain, and at the same time realizes beamforming in a simpler way, effectively reducing the antenna blind area and interference in adjacent areas.

The invention provides an electronic tag and an identification system. The electronic tag comprises a substrate; the electric base layer is arranged on the first surface of the substrate; the antenna layer is formed on the surface, deviating from the substrate, of the electric base layer and is suitable for responding to an external electromagnetic field to form an electric signal; the chip is arranged in the middle of the antenna layer and is suitable for outputting a radio frequency signal in response to the electric signal; and the coupling ring is configured to surround the chip by taking the chip as a center, and is suitable for responding to an electromagnetic field to enable a circuit formed by the antenna layer and the chip to perform impedance matching so as to tune the resonant frequency of the electronic tag. The identification system comprises a reader and an electronic tag, wherein the reader is configured to generate electromagnetic waves; the electronic tag is configured to respond to electromagnetic wave backscatter coupling generated by the reader so as to output a radio frequency signal to the reader, so that the electronic tag is identified by the reader.

The invention relates to a low-scattering array based on integration of a absorption and transmission integrated metasurface and a Vivaldi antenna, the low-scattering array is composed of N * N units, and each unit comprises a loss layer, an antenna radiator, an air layer between the antenna radiator and the loss layer, and a floor. The loss layer takes a dielectric plate as a substrate, resonators are printed on the upper surface and the lower surface of the dielectric plate, and each resonator is formed by sequentially rotating 90 degrees, 180 degrees and 270 degrees along the anticlockwise or clockwise direction by taking the center of the square dielectric plate as a rotating center and positioning. The antenna radiator takes a dielectric plate as a substrate, a first surface of the dielectric plate is printed with a metal patch of a radiation structure, a second surface of the dielectric plate is printed with a feed network composed of an impedance conversion microstrip line and a fan-shaped microstrip line which are connected in sequence, and the floor is a metal plate with a rectangular gap. According to the metasurface and antenna integrated structure, the bandwidth of the metasurface and antenna integrated structure is greatly widened while out-of-band scattering reduction is achieved, the low-profile characteristic is shown, and the actual application requirement of a broadband antenna system is met.

The present invention discloses a dual-polarization ultra-wideband Yagi antenna, comprising: a coaxial cable, a radiation vibrator, a reflector, a metal column and a plurality of directors; the reflector is arranged at the bottom of the coaxial cable and the metal column, the radiation vibrator is arranged on the metal column above the reflector, and is also arranged on the top of the coaxial cable; the plurality of directors are arranged in parallel on the metal column above the radiation vibrator at preset intervals. In the embodiment of the present invention, by setting the size of the reflector to be larger than the size of the radiation vibrator, when part of the electromagnetic wave generated on the radiation vibrator is radiated toward the reflector, the electromagnetic wave can be reflected to the radiation vibrator through the reflector, thereby making most of the electromagnetic waves radiate toward the director direction, which is beneficial to improving the radiation directivity of the Yagi antenna and improving the signal transmission speed of the Yagi antenna, so that it is suitable for modern mobile communications.

The utility model discloses a multi-loop antenna, which comprises a feed connector, a plurality of insulating sheaths and oscillators, the insulating sheaths and the oscillators are sequentially arranged, the length of each oscillator is lambda / 2, and lambda is operating wavelength; one end of the vibrator sequentially penetrates through the first holes formed in the insulating sheaths and then is connected with a core wire of the feed connector, and the other end of the vibrator sequentially penetrates through the second holes formed in the insulating sheaths and then is close to the core wire of the feed connector and is in a suspended state; the part of the oscillator between the adjacent insulating sheaths is arranged to be an annular body, and a preset included angle exists between the radial cross sections of the adjacent annular bodies. The total length of the oscillator is lambda / 2, and after winding, the length of the multi-loop antenna is about lambda / 2pi and is obviously lower than lambda / 4. Therefore, the length of the manufactured antenna is smaller than that of a lambda / 4 whip antenna and that of a 3 lambda / 4 J-shaped antenna. Besides, the length of the oscillator is lambda / 2, which is one time longer than the length of the oscillator of a lambda / 4 whip antenna, so that the radiation capability of the oscillator is improved.

The invention discloses a broadband power amplifier based on transformer coupling, and relates to the technical field of radio frequency integrated circuits, and a matching network based on transformer coupling effectively expands the working bandwidth of the power amplifier. The broadband power amplifier adopts a two-stage structure, the two stages adopt pseudo-differential cascode structures, a driving stage adopts a neutralizing capacitance technology to improve the circuit stability, and a power stage adopts a thick-gate transistor to improve the gain; input matching adopts a mode that a common-source gate inductor is respectively coupled with a common-gate and common-source inter-stage inductor and a common-source parallel inductor, and inter-stage and output broadband matching is realized through a magnetic coupling resonant cavity structure, so that the broadband high-gain performance of the power amplifier is realized.

The application discloses a heart-shaped broadband circularly polarized patch antenna, which comprises a dielectric substrate, a heart-shaped radiation patch, a microstrip feed line and a ground plate. A characteristic mode analysis method suitable for irregular geometric shapes is proposed, that is, a plurality of non-orthogonal characteristic modes are used to realize a broadband circularly polarized antenna. The application has the advantages of simple structure, beauty, compactness, simple feed mode, wide impedance and axial ratio bandwidth, and stable radiation pattern. The new method has clear physical mechanism, simple steps and wide application prospect.