24results about How to "Working bandwidth" patented technology

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.

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 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 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.

The application discloses a wide-band hat-type feed antenna and belongs to the technical field of satellite communication antennas. The method adopts a light-wall shaped horn loaded with an outer corrugated slot and a choke slot, improves horn and space matching, realizes expansion of a frequency band from 1.6:1 to 2.8:1, loads a slot at the horn mouth and the edge of the choke slot, realizes equalization characteristics of a feed radiation pattern, adopts a small-size sub-reflector to reduce shielding of the reflector, loads double choke slots in the reflector, reduces diffraction of the sub-reflector, and improves antenna radiation efficiency, and uses spline parameterization of the sub-reflector and the main reflector to realize integrated optimization design, so that the frequency bandwidth of the traditional hat-type feed is expanded, and good side lobe and efficiency performance are realized.

The invention discloses a frequency-adjustable bandwidth micro flexible surface acoustic wave sensor and a design and preparation method thereof. Structural design parameters and a structural design range are selected according to structural characteristics of an SAW sensor; structural design parameters, a substrate material and an electrode material are used as optimization objects, eigenvalue quality factors corresponding to all step length nodes of to-be-optimized parameters are obtained through finite element simulation calculation, a proper function fitting method is selected, function fitting is conducted on quality factors corresponding to the to-be-optimized parameters, and the quality factors corresponding to the to-be-optimized parameters are obtained; obtaining a fitting function of the to-be-optimized parameters; and optimizing the fitting function of the plurality of to-be-optimized parameters based on a multi-parameter particle swarm optimization algorithm to obtain optimized structural design parameters of the SAW sensor. A flexible substrate structure is prepared by adopting a high-precision electric field driven spray deposition 3D printing technology, and the whole SAW sensor structure is prepared by utilizing a high-precision photoetching technology. The problems that an existing SAW sensor is narrow in signal resonant frequency, large in size and poor in flexibility are solved, the stability of the SAW sensor in a complex environment is improved, and the measurement range of the SAW sensor in the complex environment is widened.

The invention discloses a high-performance miniaturized Doherty circuit, which comprises a bridge, a carrier power amplifier circuit, an auxiliary power amplifier circuit and a synthesis network, and is characterized in that the carrier power amplifier circuit comprises a first input matching circuit, a carrier amplifier and a first output matching circuit which are connected in sequence; the auxiliary power amplifier circuit comprises a second input matching circuit, a peak amplifier and a second output matching circuit; the first output matching circuit and the second output matching circuit are connected with the synthesis network, and the bridge divides an input signal into two paths of signals and inputs the two paths of signals to the carrier power amplifier circuit and the auxiliary power amplifier circuit respectively. The invention has the characteristics of high performance, miniaturization and low cost.

The application relates to the technical field of bulk acoustic wave resonators, and particularly provides a piezoelectric superlattice resonator and a preparation method thereof, which comprises a substrate, a bottom electrode, a superlattice piezoelectric layer and a top electrode connected in sequence from bottom to top; the superlattice piezoelectric layer comprises a plurality of vertically stacked piezoelectric structures, each piezoelectric structure comprises a concentration gradient layer and a concentration step layer, the concentration step layer is connected with the concentration gradient layer and located above the concentration gradient layer, the concentration gradient layer and the concentration step layer both contain a doping element, the doping element concentration of the concentration gradient layer is gradiently distributed along the thickness direction of the concentration gradient layer, and the absolute value of the difference between the doping element concentration of the concentration step layer and the doping element concentration at the top of the concentration gradient layer is greater than or equal to 15%; the piezoelectric layer can be uniformly polarized without an external high-voltage polarization, and the advantages of different doping concentrations can be considered.

The application belongs to the technical field of electronic components, and particularly relates to a tunable resistance module construction method, aiming to solve the problems of limited tunable resistance range and precision, environmental temperature interference and slow response. The method comprises the following steps: constructing a multi-range precision resistance topology network based on binary weighting and segmented distribution; establishing a resistance mapping function and a calibration database to quantify parasitic parameters and switch residual resistance; using a temperature sensing array to sample the thermal field distribution and establish a temperature drift dynamic model to calculate a pre-compensation amount to eliminate the influence of thermal drift; generating high-speed parallel instructions through a logic control processing unit to synchronously drive a low-loss electronic switch unit; and finally executing real-time monitoring and closed-loop fine adjustment of output performance. By adopting the above technical scheme, the application can achieve extremely high adjustment precision and linearity, has excellent temperature stability and extremely fast response capability, and effectively improves the AC impedance characteristic and reduces the system construction cost.

The present application relates to a kind of wideband active phase shifter based on inductive compensation, including input balun, quadrature signal generator, inductive compensation network, adder and output balun in series in turn, and 7-bit DAC connected with adder, can realize 360 ° phase shift range;The input balun and output balun all adopt two-stage differential active balun structure;The quadrature signal generator is three-stage Type-II PPF;The inductive compensation network is used to generate peak gain at high frequency point, widen working frequency band and do not affect phase shift accuracy;The adder adopts Gilbert unit and controls phase change by digital signal input mode;7-bit DAC is used to provide different bias voltage for Gilbert unit, to control current size and realize vector modulation.The present application introduces inductive compensation network between quadrature signal generator and vector modulation unit, effectively widen working bandwidth, realize gain flattening, while maintaining high phase shift accuracy and low amplitude error.

The invention is applicable to the technical field of wireless communication, and provides a slotted cross dipole antenna loaded with an artificial magnetic conductor structure, which comprises three layers of dielectric substrates, namely a first layer of dielectric substrate, a second layer of dielectric substrate and a third layer of dielectric substrate; the two pairs of crossed dipoles are printed on the top and the bottom of the first dielectric substrate in pairs, the surfaces of the crossed dipoles are provided with slots, and each pair of crossed dipoles is connected through a microstrip line segment; the metal columns penetrate through the three layers of dielectric substrates to feed the crossed dipoles; the artificial magnetic conductor structure is printed on the top of the second-layer dielectric substrate; the low-profile broadband high-isolation dual-linear polarization microstrip antenna realizes the characteristics of low profile, broadband, high isolation and dual-linear polarization, and is suitable for the field of Internet of Things and wireless communication.

The invention belongs to the technical field of microwave antennas, and particularly provides a tight coupling phased array based on a tail end array element loading parasitic short circuit structure. The antenna mainly comprises a radiation structure (I) which is composed of an opening type folding dipole, a broadband efficient electromagnetic structure and a parasitic short circuit structure, wherein the opening type folding dipole is vertically arranged above the broadband efficient electromagnetic structure; and the feed structure (II) is composed of a gradient microstrip feeder line, a coaxial feeder line and a metal floor. Different from a dipole adopted in a traditional tight coupling array, a broadband efficient electromagnetic structure and a folded dipole structure are used as a radiation unit together, a parasitic short circuit structure is loaded on the broadband efficient electromagnetic structure, and a 1 * 8 structure is constructed. In addition, by loading a parasitic short circuit structure around the broadband efficient electromagnetic structure, an additional capacitor can be introduced at the tail end of the array, impedance matching is improved, and the edge truncation effect of the tight coupling array is effectively inhibited.

This invention discloses a mode-division multiplexer (MDD) based on a five-core photonic crystal fiber. The MMDD includes a substrate and an air-hole layer region disposed on the substrate. The air-hole layer region is composed of a plurality of air holes arranged in a pattern, and is divided into a core region and a cladding region, with the cladding region enclosing the core region. The core includes a main core region, a first side core region, a second side core region, a third side core region, and a fourth side core region. The main core region is located at the center of the substrate, and the first, second, third, and fourth side core regions surround the main core region. The cladding region surrounds the main core region. This invention modulates the incident light in the side core regions into coupled light in the main core region, thereby increasing the operating bandwidth of the MMDD and reducing insertion loss, while effectively shortening the device length. This makes the MMDD suitable for miniaturized and integrated optical fiber communication systems and MMDD systems.

The invention relates to the technical field of rectangular waveguide slot antennas, and particularly discloses an I-shaped slot radiation antenna based on electromagnetic metamaterial design. Comprising a rectangular waveguide with a cavity, electromagnetic metamaterial structures which are arranged in the cavity and are axially and symmetrically arranged along the length direction of the rectangular waveguide, and an I-shaped gap which is arranged on the upper surface of the rectangular waveguide and is communicated with the cavity; the thicknesses of the two groups of electromagnetic metamaterial structures are axially increased along the length direction of the rectangular waveguide; and the I-shaped slot is arranged on one side of the metal short circuit surface close to the rectangular waveguide. One-way transmission is realized by introducing the electromagnetic metamaterial, the working bandwidth, the radiation efficiency and the gain of the rectangular waveguide slot antenna are improved by combining the I-shaped slot, and the standing-wave ratio is reduced.

The utility model belongs to the technical field of waveguides, and discloses a millimeter wave waveguide phase shifter, which comprises a waveguide body, a phase shifting metal sheet and a driving piece, the waveguide body is provided with a waveguide cavity extending in a first direction, the waveguide body is further provided with an installation cavity, the installation cavity is located on one side of the waveguide cavity, and the installation cavity is communicated with the waveguide cavity; two ends of the phase shift metal sheet are fixed in the mounting cavity, and the phase shift metal sheet has a deformation degree of freedom; and the driving part extends into the mounting cavity from the outside of the waveguide body to abut against the middle part of the phase-shifting metal sheet, the driving part acts along a second direction to drive the phase-shifting metal sheet to deform, and the second direction is perpendicular to the first direction. The antenna has the advantages of being simple in structure, small in size, convenient to process and wide in bandwidth.

This invention discloses a dual-band co-aperture circularly polarized antenna, comprising a metal cavity structure and high-frequency antenna elements and low-frequency antenna elements stacked from top to bottom within the cavity. The high-frequency antenna element includes a high-frequency radiating patch layer and a high-frequency feed layer connected to an orthogonal L-shaped probe feed structure. The low-frequency antenna element includes a low-frequency radiating patch layer and an air layer. The low-frequency radiating patch layer has a second radiating patch, an orthogonal edge-coupled feed structure, and a parasitic structure. The feed positions of the two sets of feed structures are arranged orthogonally in a horizontal spatial plane, and their excitation regions do not overlap. The low-frequency radiating patch layer and the bottom surface of the cavity serve as the metal ground planes for the two sets of feed structures, respectively. This invention can significantly improve the isolation between the high-frequency and low-frequency elements of the co-aperture antenna, expand the operating bandwidth, achieve stable circularly polarized radiation, and adapt to the integrated application requirements of satellite navigation systems.

The utility model relates to the technical field of communication, in particular to a built-in FPC (Flexible Printed Circuit) antenna for tunable broadband. The utility model provides a tunable broadband built-in FPC antenna, which comprises a dustproof layer, an electromagnetic shielding cover, a wire end and the like, the electromagnetic shielding cover is arranged on the lower side of the dustproof layer, and the dustproof layer is connected with the wire end. Through the design of integrating a plurality of switchable inductance elements, dynamic tuning and accurate matching of the resonant frequency of the antenna are realized, not only is the adaptive capacity of the antenna under different frequency bands enhanced, but also the working bandwidth of the antenna is effectively widened, and the requirements of a modern communication system for multi-frequency band, high integration level and intelligent tuning are met; low return loss can be realized in a target frequency band, and the matching performance of the antenna and a transmission line and the signal transmission efficiency are improved; the method adapts to a wide frequency band range, and the performance of multiple frequency points is good; the structure is convenient to realize, manufacturing and integration are facilitated, cost is reduced, and the antenna can be widely applied to internet of things 4G antenna projects such as power banks and water meters.

The utility model relates to a planar end-on-fire antenna suitable for 915MHz and 2.45 GHz dual-frequency communication, and belongs to the field of wireless communication antennas. The antenna comprises a director unit, an active oscillator unit, a coaxial feed line, a reflector unit and a dielectric substrate. The upper surface of the dielectric substrate is provided with a left radiator and a coaxial feeder in the active oscillator unit; a right radiator, a coaxial feeder, a reflector unit and a director unit in the active oscillator unit are arranged on the lower surface of the dielectric substrate; the coaxial feeder line is located in the middle of the dielectric substrate, the active oscillator unit is bilaterally symmetrical about the coaxial feeder line, and the coaxial feeder line is connected with the left radiator and the right radiator respectively; the upper end and the lower end of the coaxial feeder are respectively connected with the active oscillator unit and the reflector unit; the two ends of the reflector unit are provided with reflector folding parasitic units. The adjustable performance of structural parameters of the antenna supports customization of radiation patterns and frequency characteristics according to specific application scenes.

The application discloses a broadband frequency selective limiting system and a radio frequency device, and relates to the technical field of microwave radio frequency devices. Specifically, the application comprises a first input coupling unit, a first limiting component, a second input coupling unit, a second limiting component and an output synthesis unit. The input end of the second input coupling unit is connected with the first isolation end of the first input coupling unit. The output synthesis unit is electrically connected with the output end of the first limiting component and the output end of the second limiting component. Microwave signals of the first frequency band and the second frequency band are finally uniformly converged by the output synthesis unit. Through the cascading mode of the coupling unit and the limiting component reflection mechanism, the application solves the high insertion loss caused by the equal energy division of the traditional power divider and the large size problem caused by the series filter, greatly reduces the cost, and also expands the effective working bandwidth.

The application belongs to the technical field of communication and specifically relates to a coaxial-to-elliptical waveguide broadband transition device based on a step impedance probe. The application comprises an elliptical waveguide tube, a coaxial connector, a fixing seat, a short step impedance probe and a flange. The long axis side wall of the elliptical waveguide tube and the fixing seat are provided with a through hole, the fixing seat is fixed on the outer side wall of the elliptical waveguide tube, the center position of the fixing seat is consistent with the center position of the through hole, and the coaxial connector is arranged on the fixing seat. One end of the elliptical waveguide tube is provided as an elliptical waveguide tube open end, and the other end is provided as an elliptical waveguide tube closed end. The flange is fixed on the elliptical waveguide tube open end, and the open end surface is consistent with the elliptical waveguide tube open end. One end of the short step impedance probe is connected with the inner conductor of the coaxial connector, and the other end penetrates through the through hole and extends into the elliptical waveguide tube. The short step impedance probe comprises a connecting feed rod and a short step impedance feed rod. The connecting feed rod is connected with the coaxial connector and the short step impedance feed rod.

The application belongs to the technical field of patch antennas, and particularly relates to a millimeter wave broadband microstrip patch antenna with a parasitic patch. The millimeter wave broadband microstrip patch antenna with a parasitic patch is based on a traditional millimeter wave patch antenna, and a parasitic patch unit is introduced to realize a wide working bandwidth of a small-size millimeter wave antenna. The introduction of the parasitic patch unit is equivalent to introducing a second resonance point on the basis of a first resonance point excited by a driving patch unit. By opening a first groove and a second groove on the parasitic patch unit and combining the positions of the first groove and the second groove, the current path of the parasitic patch unit is adjusted, the position of the second resonance point is adjusted, the second resonance point is close to the first resonance point excited by the driving patch, the bandwidth of the millimeter wave antenna is widened, the gain of the millimeter wave antenna remains stable, and a wider working bandwidth in a frequency range of 28.88GHz-35.40GHz is realized.

The utility model discloses a compact one-to-four power divider, which adopts a two-stage symmetrical branch circuit design, filters through parallel grounding capacitors at input ports, and optimizes input matching characteristics. The first-stage branch circuit realizes impedance matching and inhibits electromagnetic coupling between branches by using a spiral inductor, an isolation capacitor and a resistance network; the secondary branch circuit compensates ultrahigh frequency signal phase and amplitude deviation through a matched transmission line and a minimum grounding capacitor (multiple small-specification capacitors are connected in series), and the isolation degree of an output port is further improved by combining an isolation resistor. Through symmetric frequency division and impedance matching technologies, the power divider realizes balanced distribution of signal amplitude and phase within the frequency band of 6-18GHz, significantly reduces return loss and insertion loss, improves branch isolation to more than 20dB, effectively solves the crosstalk problem in a multi-channel system, and improves the performance of the multi-channel system. And the requirements of scenes such as high-frequency-band wireless communication and radar detection on low-loss, high-isolation and broadband signal distribution are met.

The invention provides a power divider circuit and a semiconductor substrate, and belongs to the technical field of radio frequency microwaves, the power divider circuit comprises a first inductor and n branches connected in parallel, and n is an integer greater than 1; each branch comprises a first capacitor, a first isolation sub-circuit, a second isolation sub-circuit and a second impedance conversion sub-circuit, the first capacitor and the first inductor in each branch form a first impedance conversion sub-circuit, and the second impedance conversion sub-circuit comprises a second capacitor and a second inductor; through the power divider circuit provided by the invention, amplitude imbalance and phase error caused by path asymmetry can be eliminated fundamentally.