14results about How to "Lower quality factor" patented technology

The invention discloses a magnetic tuning F-type voltage-controlled oscillator based on multi-coil coupling, and the oscillator comprises an F-type oscillation loop which is used for generating an oscillation signal with a required frequency, and carrying out the harmonic adjustment of a frequency spectrum of the oscillation signal; the magnetic tuning transformer is used for adjusting the voltage-current relationship of the oscillation signal in the F-type oscillation loop, changing the equivalent inductance value in the F-type oscillation loop and further adjusting the oscillation frequency; the common-mode resonant capacitor is used for determining common-mode capacitance in the F-type oscillation loop and further reducing the phase noise at the second harmonic through common-mode resonance; the F-class voltage-controlled oscillator is adopted to enhance harmonic waves to achieve frequency tripling to generate millimeter wave oscillation signals, a magnetic tuning mode is adopted to replace a varactor with a low quality factor to control and change resonant frequency, and compared with a traditional LC voltage-controlled oscillator, the voltage-controlled oscillator can obtain lower phase noise and a higher quality factor, and the performance of the voltage-controlled oscillator is improved. And an additional frequency multiplier is omitted for the generation of the millimeter wave oscillation signal.

The invention discloses a method for designing and preparing an ultrathin conducting layer of a micro-hemispherical resonator gyroscope. The method comprises the following steps: obtaining thin film thickness distribution data of the inner surface of a micro-hemispherical resonator; calculating the deformation energy of each region of the micro-hemispherical harmonic oscillator, and enabling the region of which the proportion of the deformation energy to the whole body is smaller than a first threshold value on the micro-hemispherical harmonic oscillator to be a region A, and enabling the others to be a region B; based on the relation curve of the resistivity and the film thickness, the film thickness r corresponding to the inflection point of the resistivity is obtained; the film thickness rA of the area A and the film thickness rB of the area B are equal to a * r and b * r, and a and b are the maximum values of the film thickness ratio of the plane area to the area A and the area B; and carrying out performance detection after coating the inner surface of the micro-hemispherical harmonic oscillator based on the rA and the rB, and iterating the rB until the rB passes the performance detection. The method is applied to the technical field of micro electro mechanical systems, and can reduce the thickness of the film in an area with a larger deformation energy ratio of the micro-hemispherical harmonic oscillator on the premise of ensuring the conductivity of the metal film, thereby achieving the purpose of improving the performance.

The invention discloses a low-field nuclear magnetic resonance exploration device and method capable of effectively shortening dead zone time, and relates to the field of electric signal acquisition, and the device comprises an upper computer which is used for communicating with a main control circuit; the main control circuit is used for controlling and collecting the core and comprehensively controlling the work of the device; the power amplification circuit is used for amplifying the power signal input by the main control circuit and then transmitting an alternating current pulse to excite the coil; the beneficial effects of the invention are that the coil employs a transmit-receive integrated differential structure, which inhibits common-mode noise interference and improves the signal-to-noise ratio of detection; the Q-conversion circuit reduces the quality factor of the coil through parallel connection of energy discharge resistors at the two ends of the coil, the purpose of rapidly discharging energy stored in the coil is achieved, and the dead time can be effectively shortened; the high-isolation fast-switching radio frequency switch can effectively reduce the insertion loss and the generated noise, significantly reduce the switching time, further shorten the dead zone time, and improve the detection effect of a short relaxation target body.

The utility model provides a piezoelectric MEMS sounding unit and a loudspeaker, each peripheral area of the upper surface of a substrate is provided with a first piezoelectric composite unit, the middle rectangular area of the substrate is provided with a slotted gap, the edge of each diaphragm of a formed diaphragm structure is anchored, a gap structure is arranged between every two adjacent first piezoelectric composite units, and the first piezoelectric composite units and the second piezoelectric composite units are arranged in the slotted gap. The internal stress of each diaphragm layer in the diaphragm structure of the piezoelectric MEMS sound production unit due to the process can be reduced by arranging the slotting gap; the flexible material is adopted to cover the slotting gap, the flexibility of the vibrating diaphragm structure can be improved, meanwhile, sound leakage of the piezoelectric MEMS sound production unit at low frequency is reduced, the vibration amplitude and the emission sound pressure level are improved, the flexible material with low density is adopted to replace a silicon vibrating diaphragm with high density, the quality of the vibrating diaphragm structure is reduced, and the cost is reduced. The flexible material reduces the quality factor Q of the resonance of the device, and is beneficial to improving a sound pressure level SPL frequency response curve and a THD frequency response curve, thereby improving the tone quality of the piezoelectric MEMS sound production unit.

This invention discloses a slot-based self-decoupling patch antenna, comprising a top metal structure, an upper dielectric substrate, a lower dielectric substrate, a metal ground layer, and a coaxial line. The self-decoupling patch antenna of this invention symmetrically embeds rectangular slots along the vertical axis of symmetry of a rectangular metal patch. It utilizes the change in current distribution caused by the rectangular slots of the excitation unit to construct the oblique current of the coupling unit. Combined with the expansion effect of the rectangular slots of the coupling unit on the weak electric field region, self-decoupling of the patch antenna is achieved. This solves the limitation problem of decoupling spacing in self-decoupling antenna structures, enabling conventional spacing array arrangement and decoupling, while also considering a relatively wide matching and decoupling bandwidth.

The invention relates to the technical field of food storage, in particular to fried food storage equipment which comprises a storage bin assembly, a transfer assembly and a storage base station, and the storage bin assembly comprises a stainless steel bottom plate, a food steamer and a cover plate which can be sequentially stacked from bottom to top; wherein an exhaust blind pipe is arranged in the center of the stainless steel bottom plate, an exhaust hole is formed in the top of the side face of the exhaust blind pipe, first air channels are formed in the two sides of the stainless steel bottom plate, second air channels corresponding to the first air channels are formed in the two sides of the cover plate, and a separation net is arranged in the cover plate; a plurality of heat exchange pipes with the two ends communicating with the second air channel are arranged below the partition net. The transfer assembly comprises an AGV. Food stacking is more efficient through the transfer assembly, meanwhile, production automation and intelligence are improved, the arrangement place is freer through the open and integrated storage base station design, and energy consumption is lower by combining independent controllable vacuumizing and temperature control operation for each storage bin.

The invention discloses a filter and an electronic device, and the filter comprises an element body which is formed by stacking one or more dielectric layers along a stacking direction; the multi-layer resonators comprise a first multi-layer resonator, a second multi-layer resonator and a third multi-layer resonator, and each multi-layer resonator comprises a first conductor structure, a second conductor structure, a third conductor structure and two path conductors; a first signal transmission end and a second signal transmission end, the first signal transmission end is coupled with the first multilayer resonator, and the second signal transmission end is coupled with the second multilayer resonator; and a coupling capacitive structure formed by coupling metalized electrodes formed inside the element body or on the surface of the element body, the coupling capacitive structure being disposed on a coupling path between the first multilayer resonator and the second multilayer resonator. The first multi-layer resonator is coupled with the second multi-layer resonator, and the third multi-layer resonator is simultaneously coupled with the first multi-layer resonator and the second multi-layer resonator.

An inductor device includes a first inductor, a first connector, a second inductor, and a second connector. The first inductor is located in a first layer, and the first inductor includes a first trace and a second trace. The first trace is arranged in a first area, the second trace is arranged in a second area, and the first area and the second area are adjacent to each other at a junction. The first connector is arranged near the junction and in a block where the first trace and the second trace are not arranged, and couples the first trace and the second trace. The second inductor is located in a second layer, and the second inductor includes a third trace and a fourth trace. The third trace is arranged in the first area, and the fourth trace is arranged in the second area. The second connector is arranged near the junction and in a block where the third trace and the fourth trace are not arranged, and couples the third trace and the fourth trace.

The invention discloses a passive EM I filter based on an RC damper, the passive EM I filter comprises a series-mode noise suppression branch, a front-stage common-mode noise suppression branch, a conjugate coil, a rear-stage common-mode noise suppression branch and a differential-mode noise suppression branch which are sequentially arranged step by step, and the series-mode noise suppression branch is used for suppressing high-frequency-difference common-mode noise; the front-stage common-mode noise suppression branch is used for suppressing high-frequency common-mode noise; the rear-stage common-mode noise suppression branch adopts a structure with an RC damper to suppress low-frequency common-mode noise; and the differential mode noise suppression branch adopts a structure with an RC damper to suppress low-frequency differential mode noise. According to the EM I filter, the RC damper structures are introduced into the rear-stage common-mode noise suppression branch and the differential-mode noise suppression branch, so that the oscillation speed of signals can be slowed down, the ringing phenomenon is reduced, and the reliability of the EM I filter is improved.

The invention discloses a stable wide-beam broadband end-on-fire antenna, which is characterized in that a pair of inclined Y-shaped metal structures and a pair of inverted L-shaped metal structures are symmetrically distributed on two sides of the front and the rear of a dipole in a face-to-face and back-to-back manner, and multi-current distribution and resonance of the inclined Y-shaped metal structures are utilized; the end-on-fire antenna for broadband E-plane beam broadening and broadband impedance matching is realized through the vertical current compensation of the inverted L-shaped metal structure and the reduction of quality factors, and the end-on-fire antenna has the characteristics of high beam broadening degree and good beam width consistency.

The present invention relates to the technical field of food storage, specifically a fried food storage device, including a storage bin component, a transfer component and a storage base station, the storage bin component including a stainless steel bottom plate, a cage, and a cover plate that can be stacked in sequence from bottom to top; wherein, an exhaust blind pipe is provided in the center of the stainless steel bottom plate, an exhaust hole is provided on the top of the side of the exhaust blind pipe, air duct one is provided inside both sides of the stainless steel bottom plate, air duct two corresponding to air duct one is provided inside both sides of the cover plate, a partition net is provided inside the cover plate, and a plurality of heat exchange pipes connected to air duct two at both ends are provided below the partition net; the transfer component includes an AGV trolley. The transfer component makes food stacking more efficient, and also improves production automation and intelligence. The open and integrated storage base station design makes the layout location more flexible, and combined with the individually controllable vacuuming and temperature control operations for each storage bin, the energy consumption is lower.

The present invention discloses a design and preparation method of an ultra-thin conductive layer of a micro-hemispherical resonant gyroscope, comprising: obtaining film thickness distribution data of the inner surface of a micro-hemispherical resonator; calculating the deformation energy of each region of the micro-hemispherical resonator, assuming that the region on the micro-hemispherical resonator where the deformation energy accounts for less than a first threshold as region A, and the rest as region B; obtaining the film thickness r corresponding to the inflection point of the resistivity based on a relationship curve between resistivity and film thickness; assuming that the film thickness of region A and region B is r A =a·r、r B =b·r, a and b are the maximum values ​​of the ratio of the film thickness of the plane area to that of area A and area B; based on r A 、r B After coating the inner surface of the micro-hemispherical resonator, the performance is tested and the r B The present invention is applied to the field of micro-electromechanical technology, and can reduce the film thickness of the area where the deformation energy of the micro-hemispherical resonator accounts for a larger proportion, while ensuring the conductivity of the metal film, thereby achieving the purpose of improving performance.

The present application discloses an acoustic wave resonator, a method for preparing an acoustic wave resonator, and an electronic device. The acoustic wave resonator includes: a substrate, a piezoelectric layer, and at least two interdigital electrodes; the piezoelectric layer is arranged on the surface of the substrate, and a plurality of grooves are arranged on the side where the piezoelectric layer contacts the substrate or on the side away from the substrate, the depths of the plurality of grooves are all less than the thickness of the piezoelectric layer, the number of the grooves is the same as the number of the interdigital electrodes, and a interdigital electrode is arranged in each of the plurality of grooves. In this way, the interdigital electrodes penetrate deeper into the interior of the piezoelectric layer, so that the vibration mode of the excited acoustic wave can be closer to the body wave, that is, propagating inside the entire medium. Therefore, in the process of increasing the frequency, there is no need to change the size of the interdigital electrodes, so that the resistance of the interdigital electrodes is not increased, thereby avoiding the reduction of the quality factor of the acoustic wave resonator and realizing a high-quality acoustic wave resonator.

The invention discloses a broadband wide-beam mutual-coupling-removal dielectric resonance metasurface antenna which comprises a metasurface dielectric resonance antenna unit, a metal ground layer, a substrate layer and a bottom metal layer which are sequentially arranged from top to bottom. A plurality of metasurface dielectric resonant antenna units serve as radiators of the antenna and are arranged on the surface of the metal ground layer in a linear array mode. According to the invention, the metasurface dielectric resonant antenna unit is formed by combining the dielectric block units with different heights, a multi-unit array is formed, and the wide beam is realized by using the electric field component between the high and low dielectric block units; meanwhile, the bandwidth is expanded by reducing the quality factor through the high dielectric block unit, so that the antenna has the performance of wide bandwidth and wide beam; the coupling between the metasurface dielectric resonance antenna units is reduced through the low dielectric block units, so that the broadband and wide-beam mutual-coupling-free dielectric resonance metasurface antenna is realized.