632results about How to "Working bandwidth" patented technology

This invention relates to a micromachined capacitive microphone having a shallowly corrugated diaphragm that is anchored at one or more locations on the support has a plurality of dimples to support itself and rest freely on the perforated backplate. The diaphragm whose ends are not anchored is bounded by the taps of edge rail. Also disclosed includes: a fixed perforated backplate having one or more regions; an adjustable cantilever formed by the diaphragm, the support and the backplate; a plurality of dimples maintaining vertical separation between diaphragm and backplate; and the patterning of conductor electrodes carried by diaphragm and backplate.

A broadband antenna has a substrate, a coupling conductor, a conductor string, a ground conductor and a ground plane. The coupling conductor has a first coupling member and a second coupling member being separated from each other. The conductor string and the ground conductor are connected to the second coupling member. The conductor string extends along a direction opposite to the second coupling member. The ground conductor is connected to the ground plane. The broadband antenna uses the coupling conductor and the ground conductor to adjust input impedance for impedance match. The conductor string functions as a multi level resonance circuit to increase impedance bandwidth.

A microstrip patch antenna comprises a patch antenna element comprising a first conductive layer; dual probe feeds separate from each other and spaced from and field coupled to the patch antenna element for transmitting or receiving RF signals, each of the dual probe feeds having a conductor segment and a deltoid shaped conductive strip orthogonal to the conductor segment; the deltoid shaped conductive strips being coplanar; and a first dielectric material layer separating the first conductive layer and the coplanar deltoid shaped conductive strips.

The invention discloses a circularly polarized ceramic antenna based on coupling and feeding of a strip line via multiple slots, comprising an upper microstrip antenna radiator, an upper dielectric substrate, a medium dielectric substrate, a lower feed strip line and a coaxial feeder, wherein the lower feed strip line comprises a dielectric substrate layer, upper and lower metal floor layers attached to the upper and lower surfaces of the dielectric substrate and a metal feeder in the middle of the dielectric substrate layer; feed slots formed by three cross slots are arranged in the center of the upper metal floor of the strip line; the metal feeder couples and feeds the upper microstrip antenna structure via the slots; and the upper and lower metal floor layers of the strip line are connected by cylindrical via holes. The antenna adopts the feed slots formed by three cross slots to increase operation bandwidth and the 3dB circularly polarized axial ratio bandwidth, adopts the squarering dielectric substrate and the strip line for coupling and feeding to increase the gain, has the characteristics of miniaturization, band broadening and compact structure, and is convenient in processing and integration.

The invention brings forward a broadband wave absorbing material with stable polarization, for solving the technical problems of poor polarization stability and not wide low-band bandwidth existing in a conventional wave absorbing material. The broadband wave absorbing material comprises a wave absorbing structure (1), an upper medium plate (2), a foam layer (3), a lower medium plate (4) and a frequency selection surface (5), wherein the wave absorbing structure (1) is printed on the upper surface of the upper medium plate (2), the frequency selection surface (5) is printed on the lower surface of the lower medium plate (4), the upper medium plate (2), the foam layer (3) and the lower medium plate (4) are successively arranged to form an up-down stacked structure, the wave absorbing structure (1) is formed by periodically arranging M*N metal broken line units (11) of dead square structures, and the frequency selection surface (5) is formed by periodically arranging M*N frequency selection surface units (51). The polarization stability is high, the absorption frequency band width is wide, the wave absorbing feature is high, the transmission feature at a high frequency is good, and the broadband wave absorbing material with stable polarization can be applied to such fields as antenna communication and absorption shielding and the like.

Tensor transmission-line metamaterial unit cells are formed that allow the creation of any number of optic / electromagnetic devices. A desired electromagnetic distribution of the device is determined, from which effective material parameters capable of creating that desired distribution are obtained, for example, through a transformation optics / electromagnetics process. These effective material parameters are then linked to lumped or distributed circuit networks that achieve the desired distribution.

Low-profile, compact UWB embedded antenna designs are provided for use with computing devices, such as laptop computers, which enable ease of integration within computing devices with limited space, while providing suitable antenna characteristics (e.g., impedance matching and radiation efficiency) over an operating bandwidth of about 1 GHz to about 11 GHz.

The invention discloses a graphene electrode-based reflecting liquid crystal phase shift unit, which comprises two upper and lower layers of dielectric substrates, wherein a liquid crystal layer is injected into a gap between the two upper and lower layers of dielectric substrates; a plurality of metal patches which are sequentially connected in series through a connection line are arranged on the lower surface of the upper layer of dielectric substrate to form a layer of metal microstrip structure; a graphene layer completely covers the upper surface of the lower layer of dielectric substrate to form a graphene electrode; and a metal layer completely covers the lower surface of the lower layer of dielectric substrate to form a metal grounding electrode. The continuous phase shift characteristic is obtained within a broadband in an electric control manner; and the graphene electrode-based reflecting liquid crystal phase shift unit has the characteristics of being small and easy to process.

The invention relates to the field of communication and measurement control and especially relates to a dual polarization transmit-receive waveguide array antenna. The polarization transmit-receive waveguide array antenna includes N broadband dual polarization antenna sub arrays and a polarization adjusting device. Each broadband dual polarization antenna sub array includes a dual polarization opening waveguide array radiation layer and a network feed layer, wherein the dual polarization opening waveguide array radiation layer is arranged above the network feed layer and the polarization adjusting device is arranged below the network feed layer. By adopting the waveguide grid structure for feeding a plate satellite antenna, the working bandwidth of the plate satellite antenna is enlarged,share of transmit-receive of antenna opening and face is realized, radiation grating lobe is reduced and an interface is provided for automatic adjustment of electromagnetic wave polarization direction.

The invention provides a printing boardband terminal antenna with smaller occupying space. The printing boardband terminal antenna comprises a first bent metal strip group and a second bent metal strip group; a gap is formed between the first bent metal strip group and the second bent metal strip group; a microstrip feed line is used for directly feeding electricity to the first bent metal strip group so as to excite a high-frequency current on the first bent metal strip group to form resonance; and a high-frequency current on the second bent metal strip group is excited by capacitive coupling of the gap between the first bent metal strip group and the second bent metal strip group to form resonance. According to the invention, the first bent metal strip group and the second bent metal strip group are not directly connected, a plurality of frequency points are matched according to the distributed parameter effect of the gap between the two metal strip groups, and therefore the bandwidth can be widened in a larger extent. Therefore, the size occupied by the antenna can be reduced; in addition, a dedicated matching circuit and a special substrate material are not required in the invention.

The invention discloses a non-contact low-passive intermodulation waveguide connection structure and a design method thereof. A periodic metal protruding body is designed at an outer wall of a waveguide and is used as a first connection part, a step waveguide with a matched size is designed at a tail end of another one waveguide and is used as a second connection part, the first connection part isembedded into the second connection part, and a non-contact waveguide connection structure is formed by mechanical connection. Appropriate electromagnetic forbidden band characteristic is obtained bycalculating parameters such as the size of the protruding body and internal distance of the connection structure, and suppression of electromagnetic leakage in a structural gap is achieved. In the non-contact low-passive intermodulation waveguide connection structure, the internal non-contact connection of the waveguide is achieved on the premise of no influence on electromagnetic transmission, contact non-linearity of traditional connection is eliminated, passive intermodulation effect is effectively prevented, and the requirement on material, processing and assembly technology is reduced; and meanwhile, the non-contact low-passive intermodulation waveguide connection structure has the advantages of wideband, compact structure, high tolerance and the like, and can be applied into variouslarge-power low-passive intermodulation microwave parts and test systems.

The invention provides a data transmission method, equipment and a system. The data transmission method comprises the steps as follows: first network side equipment receives downlink business data from a core network and adopts first access technology; and the first network side equipment and the second network side equipment adopting second access technology cooperatively send the downlink business data to UE (Unified Equipment). The invention can solve the problems in the existing network deployment that the throughput of a user terminal is limited because the capacity of a single system is not enough and the resources are wasted because the load balance between the systems can be realized only in a switching and redirecting manner.

The invention provides an ultra-thin ultra-wideband linearly polarized electromagnetic wave polarization conversion unit structure, which is formed by a three-layer structure and comprises an artificial surface electromagnetic structure on an uppermost layer, a medium on an intermediate layer and a metal plate on a bottom layer. Through designing the artificial surface electromagnetic structure, a plurality of plasma resonant cavities are achieved and an incident electromagnetic wave can be efficiently polarized and converted into a cross-polarized reflected wave. The ultra-thin ultra-wideband linearly polarized electromagnetic wave polarization conversion unit has a series of advantages of a periodic structure property, a compact size, a broadband, high conversion efficiency, simplicity in structure, a relatively small thickness and wide application, and is easily combined with a traditional device.

An electromagnetic bandgap structure comprising a progressive cascade of a plurality of patterns of cells. The cells of each pattern are dimensioned so that each pattern has a reflection phase response centered at a different, but closely-spaced, frequency compared with the reflection phase response of an adjacently positioned pattern, so that the combined reflection phase response of the plurality of patterns provides a continuous wideband operational range.

The invention provides a wideband dual-polarization vibrator comprising a vibrator body and two feeding sheets, wherein the vibrator body comprises a baseboard and two pairs of feeding Baran extending vertically outwards from the baseboard, and a radiation sheet vertically extends out of the tail end of each feeding Baran; the radiation sheet is provided with a first radiation strip and two second radiation strips, wherein the second radiation strips are symmetrically arranged on two sides of the first radiation strip; each second radiation strip comprises a first radiation part and a second radiation part, wherein an included angle between the first radiation part and the first radiation strip is smaller than an included angle between the second radiation part and the first radiation strip; and the length of the first radiation part is less than that of the second radiation part. Compared with the prior art, the first radiation strip and the second radiation strips can better radiate electromagnetic wave to occupy more bandwidth after the electromagnetic wave is led into the radiation sheet by the feeding cables, so that the operation bandwidth of the whole wideband dual-polarization vibrator is widened, and the diverse development of the current mobile communication is satisfied.

The invention discloses a linear power amplification circuit based on the simulation of predistortion, comprising a predistortion amplifier, a first temperature-controlled attenuator, a simulate predistorter, a second temperature-controlled attenuator, a push-pull amplifier, and a last stage high-power amplifier which are sequentially connected. The invention also discloses a method to use the circuit: the simulate predistorter circuit which has relatively simple topological structure is added to produce a distortion signal of a predistortion signal balanced power amplifier; a matching circuit and a bias voltage of a power tube of the push-pull amplifier and that of the last stage high-power amplifier are adjusted to make the two power tubes complement in amplitude and phase to achieve the predistortion effect and to enable better linearity of the RF output signal. The invention is simple in circuit structure, high in working efficiency, low in cost and occupies little PCB area, which is extremely suitable for the multi-carrier linear power amplification circuits in the TD-SCDMA stations and the repeaters systems.

The invention provides an adjustable broadband polarization conversion and dynamic geometric phase modulation device based on phase change material, comprising a metal reflecting layer, a phase changematerial layer, a dielectric isolation layer and a super surface structural layer sequentially from bottom to top. The design of the polarization conversion and geometric phase modulation device is carried out based on the phase change material; optical material parameters of the phase change material, such as crystal state and dielectric constant, are changed by means of electric excitation, optical excitation and thermal excitation; dynamic modulation of polarization conversion is achieved within a broad band range; accordingly, designs of a novel functional device, such as adjustable beamdeflection, plate lens, and calculation of holographic and orbital angular momentums. A method of the invention may provide further improved ability of electromagnetic modulation of super surface, anda new idea and technical scheme are provided for the design of novel adjustable-function electromagnetic modulation elements.

The invention discloses a subwavelength plasmon polarization converter which comprises an incident polarizer and an emission polarizer which are separated by a medium or air layer. Both the incident polarizer and the emission polarizer are made of plasmon materials, small holes with subwavelength dimensions are engraved on the two polarizers, an included angle is formed between each small hole on the incident polarizer and the corresponding small hole on the emission polarizer, and the end points of the above two small holes are in intersection. When the included angle of two small holes is less than 90 degrees, the incident polarizer only allows the coupling entering of one polarized electromagnetic wave, and the emission polarizer only allows the emission of an electromagnetic wave which is orthogonal with the above polarized direction. By using a near field coupling effect between orthogonal rectangular holes, according to the system, the limitation of the Malus law can be broken, and thus the electromagnetic wave generates effective transmission and the polarization direction is rotated for 90 degrees. The converter can be used as a single-direction transmitter, a subwavelength switch and a modulator.

The invention relates to a broadband high-efficiency and high-directionality electrically small antenna, and belongs to the technical field of antennae. The antenna comprises an exciting unit, an upper parasitic unit, a lower parasitic unit, two thin cylindrical dielectric slabs and a coaxial feeder. The radii of the two thin cylindrical dielectric slabs are the same, the centers of the two thin cylindrical dielectric slabs are aligned, and the two thin cylindrical dielectric slabs are parallel in the vertical direction. The exciting unit and the upper parasitic unit are arranged on the bottom surface and the top surface of the upper thin cylindrical dielectric slab respectively, and the lower parasitic unit is arranged on the top surface of the lower thin cylindrical dielectric slab. An inner conductor and an outer conductor of the coaxial feeder are connected with two metal sheets of the existing unit respectively, and the feed end of the coaxial feeder penetrates through the lower thin cylindrical dielectric slab, extends to the lower side of the lower thin cylindrical dielectric slab by a certain distance and is connected with a 50 omega signal source. The antenna is simple in design, compact in structure and easy to manufacture and can be applied to broadband wireless communication systems with the operating frequency being 1 GHz or so.

A nano-electromechanical system comprises piezoelectric vertically aligned BaTiO3 nanowire arrays for energy-harvesting applications, sensors, and other applications. The aligned piezoelectric nanowire arrays provide highly accurate nano-electromechanical system-based dynamic sensor with a wide operating bandwidth and unity coherence and energy harvesters at low frequencies. The growth of vertically aligned (B45-mm long) barium titanate nanowire arrays is realized through a hydrothermal synthesis.

The invention discloses a broadband capacitive feed miniature microstrip paster antenna. A foam dielectric substrate is arranged between a microstrip dielectric substrate and an earth plate and thus the thicknesses of the dielectric substrates are increased; and an equivalent dielectric constant is reduced and a working band width of the antenna is extended. A metal short-circuit surface is loaded at an edge of one side of a radiation paster to form a standing wave structure from an open circuit to a short circuit; and the length of the antenna at the direction perpendicular to the short-circuit surface is a quarter of a wavelength. Slotting is carried out on the radiation paster and the path of an excitation current of the surface of the antenna paster is bent, thereby increasing the effective length of the antenna paster and thus reducing the resonant frequency and realizing miniaturization of the antenna at the another-dimensional dimension. Coupling and feeding are carried out by using a capacitive paster to realize good impedance matching, thereby reducing equivalent quality factors of the antenna and realizing increasing of the operating bandwidth of the antenna. According to the invention, a defect that the existing microstrip paster antenna can not consider the wide frequency band and miniaturization simultaneously can be overcome. The provided antenna has advantages of wide frequency band, low profile, small dimension, light weight, and easy processing.

An apparatus for introducing electromagnetic perturbation into a target device includes a piezoelectric transducer configured to deflect in response to an applied voltage and a perturber configured to deflect in response to deflection of the piezoelectric transducer. The deflection of the perturber causes electromagnetic perturbation, and in some cases a phase shift, in the target device. The electromagnetic perturbation may also be used to tune microwave devices such as filters, resonators, and oscillators.

The invention discloses a differential dual-band dual-polarized filtering antenna applied to a 5G Sub 6GHz base station system. The antenna comprises upper-layer and lower-layer dielectric substratesand four metal columns connecting the upper-layer and lower-layer dielectric substrates; the upper-layer dielectric substrate 1 is provided with a metal radiation patch, and a metal floor 2 is arranged on the upper surface of the lower-layer dielectric substrate and a metal feeder is printed on the lower surface of the same; the dual-band filtering property of the gain is acquired through slottingthe metal radiation patch and introducing a stepped impedance type open circuit branch knot into the metal feeder. The differential dual-band dual-polarized filtering antenna has the advantages of being simple in structure, easy to machine, relatively wide in resonant bandwidth within radiation band, relatively good in dual-band filter response, stable in gain and directional diagram, relativelylow in cross polarization, relatively high in port isolation, and easy to be integrated with the differential circuit. The differential dual-band dual-polarized filtering antenna can be applied to the5G Sub 6GHz base station communication system, and is particularly suitable for + / -45 degree dual-polarized base station antenna system of two bands: 3.3GHz-3.6GHz and 4.8GHz-5.0GHz.

The invention relates to a beam scanning microstrip planar reflection array antenna based on a microcrystal material and a fabrication method of the beam scanning microstrip planar reflection array antenna, which are mainly used for solving the technical problems of low power capacity and low working frequency band in the prior art. The beam scanning microstrip planar reflection array antenna comprises phase shift units, beam scanning devices and a feeding source, wherein the phase shift units are arranged right below a microstrip reflection array and are in contact with the microstrip reflection array, the beam scanning device are correspondingly connected with the phase shift units, the feeding source is connected with the beam scanning device and is arranged right below the microstrip reflection array, the phase shift units are liquid crystal units and are used for connecting an input / output end of the antenna, and the beam scanning devices are used for providing external bias for the phase shift units. By the technical scheme, the problem is solved very well, and the beam scanning microstrip planar reflection array antenna can be used for a communication and radar system.

The invention discloses a broadband, low-loss and high-balance-degree on-chip Balun. The broadband, low-loss and high-balance-degree on-chip Balun is provided with four regular-octagon plane spiral coils which are shaped like disc-like mosquito coils, the four regular-octagon plane spiral coils comprise two balance coils and two unbalance coils, the balance coils are arranged at the upper part, the unbalance coils are arranged at the lower part, an insulation layer is arranged between the balance coils and the unbalance coils, and an unsymmetrical broadside coupling structure is formed by the balance coils and the unbalance coils; an outer end point of a balance coil with narrower line width is used as an input, an outer end point of a balance coil with wider line width is suspended in the air, and inner end points of the two balance coils are connected through a metal guide line; and outer end points of the two unbalance coils are connected to input reference ground, inner end points of the two unbalance coils are respectively led out for being used as two outputs of a converter, and output reference ground and the input reference ground are connected through isolating lines of the balance coils and the unbalance coils.

The invention discloses an electrooptical modulator based on a phase-change material. The electrooptical modulator comprises an SOI substrate; the electrooptical modulator is characterized in that aninput waveguide, a mixing waveguide and an output waveguide connected in sequence are arranged on the SOI substrate in the horizontal direction, the mixing waveguide is formed by laminating a siliconwaveguide layer, a phase-change material GST layer and a copper electrode layer from bottom to top in sequence, the SOI substrate comprises a layer of silicon substrate body with the thickness of 250nanometers and a silicon dioxide layer with the thickness of 2 micrometers, the thicknesses of the input waveguide and the output waveguide are both 250 nanometers, the widths of the input waveguide and the output waveguide are both 400 nanometers, the thickness of the mixing waveguide is 290 nanometers, the width of the mixing waveguide is 400 nanometers, and silicon thin film with the thicknessof 10 nanometers is formed at one side of the silicon waveguide layer through selective erosion. The electrooptical modulator has the advantages that the size is small, on-substrate integration is facilitated, the energy consumption is low, the working bandwidth is large, the modulating depth is large, and the inserting loss is low.

An omnidirectional ultra-wideband monopole antenna, with the characteristics of simple structure, easy fabrication and low cost, mainly comprises a ground plane, a U-shaped radiating member above the ground plane and a feeding member for feeding signals to the radiating member. The radiating member further comprises a first sub-radiating member parallel to the ground plane, with a first side edge and a corresponding second side edge, a second sub-radiating member connected to the first side edge and perpendicular to the first sub-radiating member, forming a first angle therebetween, and a third sub-radiating member connected to the second side edge to form a second angle. The second sub-radiating member and the third sub-radiating member are extended in the same upright direction above the ground plane. The antenna can provide good omnidirectional radiation patterns for frequencies across a very wide operating bandwidth.

The invention relates to a wideband log-periodic dipole array antenna for feeding a substrate integrated waveguide. An upper metal coating (2) is provided with an upper assembly line (5), upper feed source element antennae (7), an upper surface (9) of the substrate integrated waveguide, a microstrip taper transition line (6) and a 50-ohm output microstrip line (8) which are sequentially connected, wherein the upper assembly line (5) is connected with the upper surface (9) of the substrate integrated waveguide, the upper feed source element antennae (7) are respectively arranged at both sides of the upper assembly line (5); a lower metal coating (3) comprises a lower surface assembly line (11) of the log-periodic dipole array antenna, lower surface feed source element antennae (12), a lower surface (13) of the substrate integrated waveguide and a ground surface (14) of a microstrip line; the lower surface assembly line (11) of the log-periodic dipole array antenna is symmetric in parallel to the upper assembly line (5) of the log-periodic dipole array antenna, the lower surface feed source element antennae (12) are symmetric in cross to the upper feed source element antennae (7); and the lower surface (13) of the substrate integrated waveguide is symmetric to the upper surface (9) of the substrate integrated waveguide and is connected with the ground surface (14) of the microstrip line.