31results about How to "Adjust impedance" patented technology

The application provides a multi-loudspeaker assembly impedance dynamic adjusting circuit comprising a multi-loudspeaker assembly, a switch element assembly and a control unit; the multi-loudspeaker assembly comprises two or more loudspeakers with the same electroacoustic parameters; the switch element assembly comprises a plurality of switch elements, wherein switch levels of each switch element are respectively connected between the loudspeakers and power amplifiers and between anodes and cathodes of different loudspeakers; the control unit can connect or disconnect the switch elements according to set control logic; the switch elements are connected or disconnected so as to connect/disconnect the connected loudspeakers with/from power amplifiers, and series and parallel connection combinations between the loudspeakers can be controlled, thus adjusting the multi-loudspeaker assembly impedance. The adjusting circuit can dynamically adjust the multi-loudspeaker assembly load impedance, thus allowing the power amplifiers and sound units to work in the maximum performance as possible, and improving the expressive force of the maximum and minimum volumes.

Disclosed is a connector wherein a receptacle is provided with: a receptacle main body, which is formed of an insulating resin, and which is provided with a fitting protruding section that protrudes from a plug-side front end surface portion of a main body section, said fitting protruding section being to be inserted into a fitting recessed section opened in the front surface of a plug; and a plurality of receptacle contacts, each of which has a contact section thereof exposed on a fitting protruding section surface portion on one side, said contact section being disposed in the connecting direction. On the plug-side front end surface portion of the fitting protruding section, a plug-reinforcing section formed by covering the plug-side front end surface with a reinforcing plate section formed of a metal plate, and an insulating protecting section, which is formed by exposing the plug-side front end surface of the fitting protruding section corresponding to the position of a desired receptacle contact, are formed. Consequently, deformation and damages of the fitting protruding section are eliminated when the plug is diagonally inserted into the receptacle, the connector is applicable to various kinds of plugs, and short-circuits due to having a plug contact in contact with the metallic reinforcing member can be eliminated.

The invention discloses a tilted elliptical monopole broadband circular polarized antenna, which comprises a dielectric substrate, a back surface of the dielectric substrate is printed with a floor with an arc edge, a front surface of the dielectric substrate is printed with a bent feeder and an elliptical monopole, the elliptical monopole is connected with the bent feeder and the connection point of which is close to one side edge of the dielectric substrate, and the elliptical monopole is inclined to the vertical center line of the dielectric substrate. The circular polarized antenna has the advantages of simple structure, easy manufacture, wide band, small size and easy adjustment.

The invention provides a tuning assembly and an NFC device. The tuning assembly comprises a control module and a compensation module. The compensation module comprises at least two compensation units; the compensation units are used for being connected to an antenna matching circuit of the NFC device in parallel; and the control module controls the opening and closing states of the at least two compensation units according to a preset logic so as to adjust the impedance of a combination of the antenna matching circuit and the compensation module. According to the configuration, the control module can adjust the impedance of the combination of the antenna matching circuit and the compensation modules in real time by controlling the opening and closing states of the at least two compensation modules, so that antenna detuning caused by various reasons can be compensated, and the communication performance of the NFC device is ensured.

The invention relates to a foldable mobile terminal, an antenna control method and a readable storage medium. The foldable mobile terminal foldable mobile terminal comprises a first screen module and a second screen module; the foldable mobile terminal further comprises an antenna module; the antenna module is arranged on the first screen module; and the antenna module comprises an antenna and a matching circuit. According to the foldable mobile terminal, the tuning parameter of the antenna is adjusted through the matching circuit according to the working state information of the foldable mobile terminal, so that the impedance corresponding to the antenna can be adjusted, and therefore on the premise that the performance of the antenna is guaranteed, the number of antennas is reduced, the antenna space is saved, and the influence of an antenna clearance area on a mainboard swing piece is reduced.

The invention discloses an RFID ultra-high frequency Inlay applied in 860-960 MHz, comprising an RFID chip, an inductor coil, a bent body A, a radiator A, a bent body B, a radiator B and a PET substrate. The Inlay of the invention has high sensitivity in the frequency range of 860MHz to 960MHz for the industries of logistics, clothing, footwear, pharmaceuticals and the like. -13dbm - -16dbm, and arelatively long reading distance of 7m to 10m, strong anti-jamming ability to surrounding environment and material, Can be easily packaged as labels, hangtag and other forms of carrier, suitable forlogistics, clothing, footwear, pharmaceuticals and other large-scale applications, but also for label size miniaturization requirements of the industry, in the same peripheral size products have goodperformance (sensitivity and read distance).

The invention discloses an antenna tuner which structurally comprises an antenna device, a wiring terminal, a fixed sheet, a protective shell, a signal adjusting terminal and a circuit groove box. When a device is used, a frequency raiser mechanism is arranged. In the working process of the antenna tuner, for a surrounding-variable environment, when the frequency of a transmitter is changed, the impedance between the transmitter and the antenna is not matched, the radiation power is reduced, the operation is troublesome, fine adjustment is difficult to perform, the frequent mismatch of the antenna is caused, and the structure of the antenna cannot be frequently changed, the above problems are solved by the invention, the equipment is matched with a bearing frame through a linkage swing rod; the limitation of a traditional antenna fixing mode is broken through, meanwhile, an auxiliary supporting scheme is provided for signals of an antenna mast, the coverage points of the frequency raiser can be flexibly increased through signal strips, the impedance between the transmitter and the antenna is effectively adjusted, and the signal feedback is efficiently matched and more convenient.

The invention discloses a voltage-reduction regulation circuit. The voltage-reduction regulation circuit comprises a switch tube, a feedback module and a regulation module. The first end of the switchtube is used as an input voltage end, the second end of the switch tube is used as an output voltage end, the first end of the feedback module is connected with the second end of the switch tube, thesecond end of the feedback module is connected with the first end of the regulation module, and the second end of the regulation module is connected with the driving end of the switch tube. Accordingto the voltage-reduction regulation circuit, the output voltage is processed by the feedback module to obtain the feedback voltage so as to realize effective control when the output voltage is too high or too low, and the voltage at the driving end of the switch tube is adjusted by the feedback voltage and the quasi-level voltage so as to adjust the impedance of the switch tube so as to realize voltage-reduction adjustment of any pressure difference, and the voltage-reduction regulation circuit has the advantages of simple structure, high reliability, good stability and the like.

The invention discloses a wafer supporting seat, which comprises a supporting disc, a first connecting part and a second connecting part, the shaft is provided with a top end and a second connecting part located at the top end, and the second connecting part is detachably connected with the first connecting part, so that the top end of the shaft is detachably connected to the bottom of the supporting disc; and the insulating medium sheet is clamped between the first connecting part of the supporting disc and the second connecting part of the shaft, so that a capacitor in the electrode loop is formed. In addition, the invention also discloses a process cavity.

The invention relates to the technical field of communication, particularly to a multi-frequency antenna and communication equipment comprising the same. The multi-frequency antenna comprises a dielectric substrate, wherein a grounding plate is arranged on the surface of one side of the dielectric substrate, a high-frequency radiation unit and a low-frequency radiation unit are arranged on the surface of the other side of the dielectric substrate, the high-frequency radiation unit comprises a circular first resonance body and a plurality of rectangular grooves formed in the first resonance body, and the low-frequency radiation unit comprises disturbance branches connected to the edge of the first resonance body and a conductor used for connecting the two disturbance branches. According tothe multi-frequency antenna, the impedance of the antenna can be adjusted by forming the rectangular groove in the circular first resonance body so as to form the high-frequency part of the antenna, and the disturbance branches are connected together by using the conductor structure so as to form the low-frequency part of the antenna, so that the coverage of multiple frequency bands is realized, and the overall structure of the product is flat-plate-shaped so as to achieve the small occupied space.

The invention provides an electric connector and a terminal thereof. The electric connector includes an insulation body and the terminal; the insulation body is provided with a fixation hole; and thefixation hole is provided with a first inner side wall and a second inner side wall opposite to the first inner side wall. The terminal includes a contact portion, a fixation portion and a connectionportion, the contact portion and the connection portion separately extend from the fixation portion and are exposed to the insulation body, the fixation portion is provided with a first side surface and a second side surface opposite to the first side surface, the fixation portion is provided with a through hole, the fixation portion is fixed in the fixation hole, the through hole is located in the fixation hole, the first side surface orients to the first inner side wall and is separated from the first inner side wall by first spacing, and the second side surface orients to the second inner side wall and is spaced apart from the second inner side wall by second spacing. The structural design makes impedance of the electric connector easy to adjust, and helps to reduce the cost and time course of development of the electric connector.

An embodiment of the invention discloses an electromagnetic voltage-regulator with a single-phase voltage regulating mechanism. The single-phase voltage regulating mechanism is one of an A-phase voltage regulating mechanism, a B-phase voltage regulating mechanism and a C-phase voltage regulating mechanism which are the same in structure, and comprises a first iron core, a second iron core, a first induction winding, a first high-voltage winding, a second sending winding, a second high-voltage winding, a third induction winding, a third high-voltage winding, a fourth induction winding and a fourth high-voltage winding. The first iron core and the second iron core are in parallel mutually, the first induction winding, the first high-voltage winding, the second induction winding and the second high-voltage winding are wound on the first iron core, and the third induction winding, the third high-voltage winding, the fourth induction winding and the fourth high-voltage winding are wound on the second iron core. The electromagnetic voltage-regulator has the advantages of safety, high reliability and low cost.