11results about How to "Increased bandwidth" patented technology

The invention discloses an antenna structure and a heat dissipation device. The antenna structure is arranged on a metal piece and comprises a first slotted hole, a second slotted hole, a grounding part and a short circuit part. The first slotted hole is formed on the metal piece along an axis direction and is used for feeding in a signal; the second slotted hole is formed in the metal piece along the axis direction, and the second slotted hole and the first slotted hole are separated by a distance in the axis direction; the grounding part is coupled with the metal piece; the short circuit portion crosses the second slot and is coupled to the grounding portion. Therefore, the antenna structure and the heat dissipation device can solve the problem that the position of the equipment antenna is limited and improve the bandwidth range of the antenna.

The present application discloses a vibration motor and electronic device, belonging to the field of communication equipment, the vibration motor includes a shell, a mass block, a first vibration component and a second vibration component, the first vibration component and the second vibration component are sandwiched between a first surface and a second surface oppositely arranged in the shell; the first vibration component includes a driving member, the driving member is installed in the shell, and the driving member cooperates with the mass block; the second vibration component includes a piezoelectric structure, the piezoelectric structure is connected to both the shell and the mass block; when the driving member is energized, the driving member drives the mass block to reciprocate between the first surface and the second surface; when the piezoelectric structure is energized, the piezoelectric structure deforms and drives the mass block to reciprocate between the first surface and the second surface. The above technical solution can solve the problem that the bandwidth of the current vibration motor is relatively small.

The invention belongs to the technical field of rock electrical property measuring devices, and particularly relates to a rock electrical property measuring device, a rock electrical property measuring method and application. The rock electrical property measuring device comprises a T-shaped fixing rod, wherein the T-shaped fixing rod comprises a horizontal rod and a vertical rod perpendicular to the horizontal rod; the sliding rods comprise a first sliding rod, a second sliding rod and a third sliding rod; the second sliding rod is located on the left side of the vertical rod, the first sliding rod and the third sliding rod are sequentially located on the right side of the vertical rod, and the sliding rods slide along the horizontal rod. The first electrolytic tank is arranged among the first electrolytic tank, the second electrolytic tank, the second sliding rod and the vertical rod, and the second electrolytic tank is arranged between the first sliding rod and the third sliding rod; and the lower ends of the first flexible electrode, the second flexible electrode, the first sliding rod and the vertical rod are respectively connected with the first flexible electrode and the second flexible electrode which are oppositely arranged. According to the invention, the integrated design is adopted, so that the frequency band width of electrical measurement is widened, and the measurement precision is improved.

The application discloses a ship radiated noise power spectrum measurement method based on frequency difference beam forming, comprising the following steps: obtaining a to-be-measured radiated noise signal received by a base array; constructing a difference frequency signal through the conjugate product of the to-be-measured radiated noise signal and a reference frequency signal; performing beam forming on the constructed difference frequency signal based on the difference frequency, and calculating the amplitude of the beam output signal of the difference frequency signal; correcting the amplitude of the beam output signal of the difference frequency signal by using the amplitude of the reference frequency signal to obtain the amplitude of the to-be-measured radiated noise signal, and calculating the power spectrum of the to-be-measured radiated noise signal. The application converts the signal outside the design frequency band of the base array to the inside of the design frequency band to perform beam forming, improves the array gain, better suppresses the environmental noise, improves the measurement performance of the base array on the radiated noise outside the design frequency band, greatly expands the frequency band width of the ship radiated noise measurement, and can realize the measurement of the radiated noise with a larger bandwidth by using a smaller aperture array.

The utility model relates to a double-helix type piezoelectric composite material structure, which comprises an upper electrode, a lower electrode, a polymer phase and a piezoelectric ceramic phase, and particularly, the piezoelectric ceramic phase is of a double-helix structure, and the piezoelectric ceramic phase and the polymer phase are alternately distributed at intervals. According to the utility model, the conventional piezoelectric ceramic phase arrangement mode is changed, and the piezoelectric ceramic phase is designed into a double-helix structure, so that the sound field directivity of the transducer is effectively improved, and meanwhile, under the limitation of the width, the electromechanical coupling coefficient, piezoelectric property and the like of a composite material as well as the sensitivity, bandwidth and the like of the transducer can be improved; the formed 2-2 and 1-3 type piezoelectric composite material structures effectively suppress crosstalk of transverse vibration, reduce energy loss generated by transverse coupling motion, enable a thickness vibration mode to be purer, and meet performance requirements of sensor elements with different functions.

The invention discloses a multifunctional tenon-and-mortise-shaped piezoelectric vibrator and a preparation method thereof, and belongs to the field of piezoelectric materials. A multifunctional tenon-and-mortise-shaped piezoelectric vibrator comprises a tenon-shaped unit, a mortise-shaped unit, a connecting unit and an electrode unit. And the tenon-shaped units are integrally processed. And the mortise-shaped units are integrally processed. And the tenon-shaped units and the mortise-shaped units are laminated and compounded along the thickness direction, so that double-resonant-frequency coupling of a conductance curve is realized, and the purpose of bandwidth expansion is achieved. The tenon-shaped unit and the mortise-shaped unit both comprise air gap modules, and the air gap modules do not contain polymer materials, so that a high electromechanical coupling coefficient can be generated, and the high-sensitivity receiving performance of the transducer is met. The invention further provides a preparation method of the multifunctional tenon-and-mortise-shaped piezoelectric vibrator aiming at the tenon-and-mortise-shaped vibrator structure, the piezoelectric vibrator is integrally formed in a step-by-step cutting-multiple filling mode, the method has the advantages of being simple in process, short in preparation period, low in cost and the like, and development of a high-performance receiving and transmitting small-size integrated underwater acoustic transducer and an array of the high-performance receiving and transmitting small-size integrated underwater acoustic transducer is facilitated.

The invention discloses a cross dipole broadband antenna, which belongs to the field of wireless communication, has a dual-polarization characteristic and can support two mutually vertical polarization directions at the same time, and the high isolation and the optimized design of the dual-polarization antenna reduce signal attenuation and loss and ensure the reliability and the stability of a communication system. Moreover, the antenna is provided with a balun structure which can effectively cut off the high-frequency current flowing through the sheath of the cable shielding layer from the cross dipole patch, thereby ensuring the correct transmission of signals and good antenna performance. The Balun structure can realize the conversion between different impedances, so that the impedance between the antenna and the transmission line is matched, and the maximum power transmission is ensured; besides, the patch of the antenna adopts a novel fractal structure, namely a quartering circular fractal structure, so that the antenna performance is improved, the broadband characteristic is maintained while the light weight is realized, the frequency bandwidth is improved, and the radiation efficiency is optimized.

The utility model provides an antenna device, an antenna module and a communication device. An antenna device (120) is provided with a base plate (10) on which a ground electrode (GND) is formed, and a plurality of split substrates (20) attached to the base plate (10). Each of the plurality of split substrates (20) has a dielectric substrate (23) and a plurality of antenna elements (21), and each of the plurality of antenna elements (21) radiates a radio wave having an X-axis direction as a polarization direction and a radio wave having a Y-axis direction as a polarization direction. In each of the plurality of split substrates (20), the plurality of antenna elements (21) are arranged on the dielectric substrate (23) so as to be arranged in the X-axis direction and in the Y-axis direction.

The invention discloses a receiving and transmitting integrated tenon-and-mortise type underwater acoustic transducer, and belongs to the field of piezoelectric materials and sensors thereof. The device comprises a tenon-and-mortise-shaped piezoelectric module, a backing layer, a multi-core cable, a rear end cover and a watertight layer. The tenon-and-mortise-shaped piezoelectric module is mainly composed of a tenon-shaped unit, a mortise-shaped unit, an electrode unit and a rubber unit. The tenon-shaped units and the mortise-shaped units are connected through the rubber units. After the rigid tenon modules and the rigid mortise modules are stacked in the longitudinal direction through the rubber units, multimode bandwidth expansion is achieved. The backing layer is fixed at the bottom of the tenon-and-mortise-shaped piezoelectric module and plays a role in supporting the piezoelectric module and absorbing clutters; the multi-core cable is fixed at the bottom of the backing layer, one end is connected with all the leads, and the other end is led out from the inner side of the slotted hole of the rear end cover. The tenon-and-mortise-shaped piezoelectric module, the back lining layer and the top end face of the rear end cover are wrapped by the watertight layer. The tenon-and-mortise-shaped piezoelectric modules all comprise air gap units, and the air gap units do not contain any polymer material, so that the coupling between piezoelectric columns is reduced to the minimum, and the sensitive receiving performance of the transducer can be improved.

The utility model discloses an annular coupling radiation structure antenna, comprising a PCB substrate, a radiation part and a feed ground part, the PCB substrate is used as a basic carrier and can provide physical support for the radiation part and the feed ground part of the antenna; the radiation part comprises a feed arm, a feed welding point is reserved at one end of the feed arm, the other end of the feed arm is connected with a high-frequency coupling radiation surface, the high-frequency coupling radiation surface is partially coupled with a gap of the feed arm, a low-frequency coupling radiation surface is arranged at the tail end of the high-frequency coupling radiation surface in an extending manner, and the low-frequency coupling radiation surface is annular; the feed ground part serves as a grounding area of the antenna and comprises a feed ground welding point located at one end of the feed ground part and a feed ground extension section extending towards the other end of the feed ground part. According to the utility model, the bandwidth of the antenna can be increased under the same size, the current situation that the space requirement and the performance are unbalanced in the existing antenna design is further relieved, and the antenna can realize effective bandwidth resonance with a smaller size requirement, so that the design requirement of the antenna is met in a limited environment.

The invention relates to the technical field of leakage protection of fluxgate sensors, in particular to a high-frequency leakage protection method based on attenuation characteristics of a digital filter. The method comprises the following steps: applying a modulation signal to the protection device, and measuring to obtain a sampling value; obtaining a maximum value sequence through preprocessing according to the sampling value; constructing a ratio according to the maximum value and the minimum value of the maximum value sequence, and performing complex wave and high-frequency signal judgment by using the ratio; when it is judged that the signal is the high-frequency signal, low-pass filtering is carried out on the high-frequency signal exceeding the preset frequency, data after low-pass filtering are obtained, and the data after low-pass filtering comprise frequency response characteristics; and generating a frequency tripping curve corresponding to the protection device according to the data after low-pass filtering.