48results about How to "Broaden the working frequency band" patented technology

The invention discloses a three-frequency-range common-caliber active navigation antenna, for solving the problems of not wide enough work frequency band of a conventional navigation antenna, low radiation efficiency and low elevation angle gain of a directional diagram. The three-frequency-range common-caliber active navigation antenna comprises a common-caliber antenna unit (1), a filter (2), a low-noise amplifier (3) and a back cavity (4). The common-caliber antenna unit (1) comprises a high-frequency radiator, an intermediate frequency radiator and a low frequency radiator, the three radiators are successively laminated from top to bottom, and the high frequency radiator and the low frequency radiator employ capacitance coupling feed and introduce parasitic patches; the filter (2) and the low-noise amplifier (3) are disposed below the common-caliber antenna unit (1) and are installed in the cavity of the back cavity (4); and the common-caliber antenna unit (1), the filter (2) and the low-noise amplifier (3) are successively connected. The three-frequency-range common-caliber active navigation antenna can realize multiplexing of antennas of three system frequency ranges and also has the advantages of wide work frequency band and good radiation characteristic, thereby being applied to reception of signals of a satellite navigation system.

The invention discloses a high-order odd harmonic THz source frequency multiplier, and aims to provide a frequency multiplier which is simple in structure, high in efficiency and capable of effectively providing terahertz signals. The high-order odd harmonic THz source frequency multiplier is implemented according to the technical scheme that an external radio frequency signal is inputted through a standard rectangular waveguide (1), gets into a local oscillator low-pass filter (3) through an input waveguide-microstrip transition structure (2) and then enters a Schottky diode. Meanwhile, the external part performs feed excitation on the Schottky diode through direct current feed of a fundamental wave low-pass filter (4). The Schottky diode performs frequency conversion on input fundamental waves to generate high-order harmonic waves which comprise odd harmonic components and even harmonic components, finally the high-order harmonic waves get into an output waveguide (7) through an output microstrip-waveguide transition structure (6), the waveguide is lowered, a high-pass filter for filtering the even harmonic waves is formed, and output is performed through the standard rectangular waveguide. The high-order odd harmonic THz source frequency multiplier solves a problem of realizing a terahertz signal source.

The invention discloses a multiband broadband dipole antenna with coupling stubs. The multiband broadband dipole antenna comprises a dielectric board, two dipole arms, two coupling stubs and a microstrip balun feeder. The two dipole arms and the two couplings stubs are printed on both sides of the dielectric board, respectively. The dipole arm and the coupling stub on the same plane are rotated by180 degrees and then are symmetrical with the dipole arm and the coupling stub on the other plane based on the dielectric board. The dipole arms play the role of widening the frequency band, and thecoupling stubs introduce a new mode of work to increase the working frequency band of the antenna. Semicircular parts in the dipole arms and the coupling stubs are both in a fractal form, and the antenna area is reduced without changing the performance. In the impedance matching, the invention introduces a small rectangle to increase the inductance of the antenna to counteract the capacitance caused by the coupling, so that the antenna can achieve a good match without the need of a complicated peripheral matching circuit.

The invention discloses an ultra-wideband amplitude-phase compensation digital attenuator circuit, the circuit is formed by cascading n attenuation units through inductance matching, the n attenuationunits adopt any one or more of a simplified T-type circuit, a bridge-T topology with a compensation structure, and a pi-type topology with a phase compensation structure. The circuit is simple in topological structure, has a phase compensation structure, can realize an ultra-wideband working range, has the characteristics of low phase error, low insertion loss and high attenuation precision, andcan be produced on a large scale by adopting a microwave monolithic integrated circuit process technology.

The invention particularly relates to a surface plasmon polariton structure shared high-frequency-ratio dual-band antenna, and belongs to the technical field of antennas. According to the invention, the low-profile compact structure of the antenna is realized through sharing of a plasmon polariton structure and a radiation double-arm structure between a millimeter wave tapered slot end-fire antenna and a microwave planar sleeve monopole omnidirectional antenna, due to the characteristic of the low profile, a metal grid array loaded by the antenna and a surface plasmon polariton structure can jointly form a refractive index gradient lens to improve the gain of the millimeter wave tapered slot end-fire antenna under the condition that the size of the antenna is not increased. According to the invention, the transmission distance of millimeter wave frequency band signals is increased; and through combination of the high-frequency antenna and the low-frequency antenna, the working frequency band of the antenna is expanded, and different radiation modes of different frequency bands are realized.

The invention provides a closed-loop disc type optical fiber accelerometer based on a moving coil feedback mechanism. The closed-loop disc type optical fiber accelerometer comprises an elastic disc, amass block, a probe shell, a DFB light source, a first optical fiber coupler, an optical fiber ring, a second optical fiber coupler, a photoelectric detector, a data acquisition card, a power amplification circuit, the moving coil feedback mechanism and a computer. And the moving coil feedback mechanism loaded with a feedback electric signal applies a feedback force to the elastic disc to realizean electromagnetic force feedback loop of the disc type optical fiber accelerometer. For the disc-type optical fiber accelerometer, a working frequency band can be broadened, a dynamic range can be increased, nonlinear distortion can be reduced, and the disc-type optical fiber accelerometer can be widely applied to the fields of earthquake monitoring, underwater acoustic detection and the like.

The invention provides an electric rotating machine based on super magnetostriction material. The electric rotating machine based on the super magnetostriction material comprises a precompression system, a stator and two rotors, wherein the precompression system comprises an output shaft, two springs and two spring fixing pieces, the two rotors are respectively connected with two ends of the stator, the output shaft penetrates the center of the stator and the centers of the rotors and is connected with the stator and the rotors in a sleeved mode, the springs are respectively sleeved on two ends of the output shaft and press the rotors tightly, and the spring fixing pieces are connected with the output shaft and press the springs tightly. The stator comprises two stator driving ends, a plurality of super magnetostriction units and a plurality of fixing pieces, wherein the super magnetostriction units are evenly arranged between the two stator driving ends, two ends of each super magnetostriction unit are respectively connected with the stator driving ends through the fixing pieces, and the stator drives the rotors to rotate by friction. The electric rotating machine based on the super magnetostriction material has the advantages of being high in accuracy, free of noise, fast in response, big in bearing capacity, big in working bandwidth, good in stability, high in reliability, free of fatigue, free of overheating failure and the like.

Characters are that antenna is prepared on base plate with low dielectric constant through PCB technique. Gradation structure of unipolar aperture as radiating element is fabricated on shielded conductor of microstrip line. Abrupt changed feed line and forked tuning branch section in proper size are fabricated on another side of shielded conductor to carry out wide band matched power feed. Included angle between gradation line of the said aperture and perpendicular borderline is 20-30 degree. Advantages are: simple structure, small size and easy of production. Size can be reduced further if medium with higher dielectric constant is adopted in design. Feeding structure is in favor of integrated design i.e. semiconductor technique realizes integration between antenna and circuits at front end. The disclosed antenna is suitable to small type communication device in ultra broadband.

The invention discloses a piezoelectric vibration energy collection device. The piezoelectric vibration energy collection device comprises a cantilever bimorph vibrator, a quality block, a first linear spring, a second linear spring, a base, a first hinge, a second hinge and a third hinge, one end of the cantilever bimorph vibrator is fixedly connected with a first support plate of the base, the other end of the cantilever bimorph vibrator is bonded with the quality block, the first hinge is arranged in the center of the quality block, the first hinge is connected with one end of the first linear spring and one end of the second linear spring separately, the second hinge and the third hinge are separately arranged on a second support plate of the base, the second hinge and the third hingeare respectively connected with the other end of the first linear spring and the other end of the second linear spring, the first hinge, the second hinge and the third hinge are in the same vertical plane and form an isosceles triangle, and the second hinge and the third hinge are symmetrically distributed on the second support plate with the cantilever bimorph vibrator as the center. The piezoelectric vibration energy collection device can perform periodic vibration drastically and easily even under conditions of low environment excitation strength and no strong magnetic field impact, and cancollect environment vibration energy under broadband efficiently.

The invention provides a stub loaded artificial magnetic conductor based high gain microstrip antenna. Compared with a common artificial magnetic conductor based microstrip antenna, the stub loaded artificial magnetic conductor based high gain microstrip antenna adopts an artificial magnetic conductor reflecting surface with an aperiodic loaded stub, the electric field intensity distribution of the antenna surface can be effectively improved due to appropriate adjustment of the length distribution of the loaded stub, and accordingly the antenna working band, the radiation gain and the radiant efficiency are greatly improved and particularly the radiation gain is improved by 1.73dB and additionally, the antenna reserves the artificial magnetic conductor low profile character and the thickness of the integral structure is 0.05lambda. The antenna adopts a double-layer microwave dielectric-slab, is simple in structure, easy to machine, small in cost and weight relatively and accordingly allows production in a large scale.

The invention belongs to the technical field of dual-polarized antennas, and discloses a low-profile broadband dual-polarized antenna with the high front-to-rear ratio. The antenna is provided with aradiation patch, an impedance transformation microstrip line, and a reflection floor. The radiation patch employs four trapezoidal radiation elements. One of a pair of radiation elements of the radiation patch in a diagonal direction works in a linearly polarized working state, and the other one of the pair of radiation elements of the radiation patch in the diagonal direction works in an orthogonal linearly polarized working state. The microstrip line employs a cross-type feed mode. One pair of radiation elements carry out the coupling feed and direct feed through a microstrip transmission line, and the other pair of radiation elements are connected and carry out feed through a microstrip transmission line of the same type, wherein the cross part of the two microstrip transmission line isisolated through the bending of one microstrip line. The thickness of the antenna is 0.1*lambda, the impedance bandwidth of the antenna is 36.6%, the isolation degree of an impedance bandwidth innerport is greater than 25dB and the front-to-rear ratio can reach 31dB. The antenna achieves the high isolation degree and the wide impedance bandwidth.

The invention provides a vertical polarization C-waveband broadband short backfire antenna. The opening end of a reflection cavity is sealed by a reflection substrate; a radiation foundation plate, a media matrix and a radiation antenna substrate are arranged in the reflection cavity; one side, which faces the reflection cavity, of the reflection substrate is etched with a round reflection array element; the center of one side, which faces the reflection substrate, of the radiation antenna substrate is etched with a square metal patch; the small-diameter section of a parasitic array successively passes through the radiation antenna substrate, the media matrix and the radiation foundation plate and is supported on the bottom of the reflection cavity, and the big-diameter section of the parasitic array is positioned on one side, which faces towards the reflection substrate, of the radiation antenna substrate; a radio frequency connection piece successively penetrates through the radiation foundation plate, the media matrix and the radiation antenna substrate from the bottom of the reflection cavity and is connected with the metal patch of a radiation antenna array element. The vertical polarization C-waveband broadband short backfire antenna achieves the requirements of wide main valve, low accessory valve, simple structure, convenience in carrying, miniaturization and broadband work, and can be used for ground base station communication, ground tracking guidance communication and anti-jamming communication systems.

The embodiments of the invention provide a subcarrier optical phase-locked loop system, comprising a signal laser, a phase detection module, a frequency difference adjusting module, a loop filter, a control voltage processing module and a light pressure controlled oscillator, wherein the phase detection module is used for determining a phase difference signal of signal light and first local oscillator light, and separately sending the phase difference signal to the frequency difference adjusting module and the loop filter; the frequency difference adjusting module is used for determining a first control voltage according to the frequency of the phase difference signal; the loop filter is used for determining a second control voltage according to the frequency of the phase difference signal when the frequency of the phase difference signal is smaller than a preset frequency; and the control voltage processing module is used for determining a comprehensive control voltage according to the first control voltage and the second control voltage, so that the light pressure controlled oscillator generates second local oscillator light according to the comprehensive control voltage and sends the second local oscillator light to the phase detection module. The working band of the subcarrier optical phase-locked loop system is improved.

An acceleration sensor device of optical fibers of a cantilever based on intensity modulation method detection structurally comprises a transmission optical fiber (1), a receiving optical fiber bundle (2) and a rectangular sealed shell body (3), wherein a transmission plastic optical fiber interface (4) and a receiving plastic optical fiber interface (5) are formed in the center of the left end surface and in the center of the right end surface of the rectangular sealed shell body (3) respectively, and the shell body (3) is filled with transparent liquid (7) to counteract the gravity influence. The receiving optical fiber bundle (2) is an optical fiber bundle arranged in a cellular mode and formed by a plurality of plastic optical fibers, a main receiving optical fiber is located in the center, six optical fibers surround the main optical fiber to form a first layer structure, and twelve optical fibers surround the first layer to form a second layer of detection structure. When a system applies acceleration, the cantilever deviates from the main receiving optical fiber, the deviation direction is the acceleration direction, and the acceleration and the acceleration direction can be obtained by calculating the light intensity difference between the main receiving optical fiber and the surrounding receiving optical fibers.

The invention discloses an ultra-short wave broadband omnidirectional antenna. The antenna comprises a first upper radiation oscillator (1), a metal transition section (2), a second upper radiation oscillator (3), a metal connecting section (4), a lower radiation oscillator (5), a parasitic radiation oscillator (6), a parallel open stub (7), a parallel two-conductor transmission line (8), a metal casing (9) sleeved outside the second upper radiation oscillator and a metal casing (10) sleeved outside the lower radiation oscillator, wherein the first upper radiation oscillator (1) is connected with the second upper radiation oscillator (3) through the metal transition section (2); and the upper and lower radiation oscillators are connected through the metal connecting section (4). Upper radiating bodies of the antenna are subjected to electromagnetic coupled feeding, so that the impedance bandwidth of the antenna is effectively increased, and the working band of the antenna is widened.

A package box body structure for improving a resonant frequency of a superconduction quantum processor comprises a base or comprises a package box body and a plurality of conductor blocks, wherein thesuperconduction quantum processor is arranged on the base, a hollow region is arranged on the base, is arranged below the superconduction quantum processor and is adjacent to the superconduction quantum processor, an accommodating space is arranged in the package box body and is used for placing the superconduction quantum processor, the size of the accommodating space in at least one direction of length, width and height is larger than the corresponding sizes of the length, the width and the height of the superconduction quantum processor so as to form a gap region, and the plurality of conductor blocks are arranged in the gap region and are contacted with an edge of the accommodating space in the package box body. The fundamental-mode frequency of an electromagnetic wave is improved bytwo ways of reducing the parasitic capacitance or reducing the effective size of a resonant cavity, so that the fundamental-mode frequency is improved to a range outside a working frequency band of the superconduction quantum processor, and the purpose of reducing or eliminating the influence of the resonant cavity on the superconduction processor is achieved.

The invention discloses an electric toothbrush with a linear vibration motor. The electric toothbrush comprises a vibrating rod, a permanent magnet, a winding and a mounting base, wherein the vibrating rod is arranged on the mounting base; the permanent magnet is fixed on the vibrating rod; the winding is arranged corresponding to the position, at which the permanent magnet is fixed, of the vibrating rod; the winding generates an AC magnetic field after pulse current is introduced; at least two vibration holes through which the vibrating rod passes and in which the vibrating rod is limited areformed in the mounting base; the vibration holes are in a strip shape; and the vibrating rod carries out linear vibration in the vibration holes under the action of the AC magnetic field through shape matching of the vibrating rod and the vibration holes. The electric toothbrush with the linear vibration motor is simple in structure; the number of parts of the electric toothbrush is reduced; andthe linear vibration motor is more suitable for the movement mode required for the electric toothbrush.

The invention discloses a high-gain slot antenna based on a graphene three-dimensional phase tunable lens and a method. The antenna adopts the graphene three-dimensional phase tunable lens, and the graphene three-dimensional phase tunable lens is placed at the front end of the slot antenna, so that the slot antenna can tune the lens unit through the reconfigurable characteristic of graphene under different bias voltages. Different bias voltages can change the surface resistance of the graphene material, so that the characteristics of the lens can be changed, the energy and phase distribution in the aperture of the slot antenna can be changed, the gain of the antenna can be improved, and the directional diagram distortion of the antenna can be eliminated. Meanwhile, the lens-loaded slot antenna is a novel mixed graphene-metal structure slot antenna, and a radiation slot structure of the antenna is replaced by a graphene structure, so that control of energy in the aperture of the antenna is further enhanced, and the frequency reconfigurable characteristic is brought to the slot antenna.

A planar orthomode transducer comprises a substrate integrated resonator, two substrate integrated waveguides connected to the substrate integrated resonator, a dual polarized metal waveguide and a printed circuit board where the substrate integrated resonator and the substrate integrated waveguides are provided, wherein the substrate integrated resonator further comprises a slot aperture in one of metallization layers, and the dual polarized metal waveguide is mounted on a surface of the printed circuit board in an area of the slot aperture of the substrate integrated resonator, wherein the substrate integrated resonator is a nonfundamental orthogonal mode resonator.

This enables widening of frequency band of the planar orthomode transducer, reducing of insertion losses, rise of the polarization diversity and providing for a standard dual polarized output waveguide serving for connecting the device with an antenna of various types.

The invention provides a high-efficiency broadband radio frequency power amplifier which comprises a first amplifying circuit which is provided with an input matching module, a driving stage amplifier, an inter-stage matching module, a power stage amplifier and an output matching module which are sequentially connected in series from a radio frequency input end to a radio frequency output end; each of the input matching module and the inter-stage matching module is provided with a plurality of series low-pass structures, each low-pass structure is provided with a series microstrip line and a shunt capacitor, one end of the shunt capacitor is loaded on a connecting line, close to one side of a radio frequency input end, of the series microstrip line, and the other end of the shunt capacitor is grounded; and the plurality of low-pass structures are connected in series to form an alternating structure of parallel capacitors and series microstrip lines. The radio frequency power amplifier has the advantages of being wide in working frequency band, high in efficiency, small in product size and the like, and can be better applied to the military electronic market.