40results about How to "Reduce ground impedance" patented technology

The invention provides a printed circuit board. The printed circuit board comprises a board body and bolts, wherein each of the bolts comprises a cap part and a rod part, the board body comprises a first signal layer, a grounding layer, a power source layer and a second signal layer, the first signal layer, the grounding layer, the power source layer and the second signal layer are sequentially arranged in a stack mode, a through hole is formed in the board body, the through hole comprises a locking hole and a penetrating hole, the locking hole is communicated from the first signal layer to the grounding layer, the penetrating hole is communicated from the second signal layer to the grounding layer and communicated with the locking hole, the cap part is accommodated in the locking part and contacted with the grounding layer, and the rod part is arranged in the penetrating hole in a penetrating mode. According to the printed circuit board, manufacture cost is low, and the ability of anti-electromagnetic interference of the printed circuit board can be effectively improved.

The invention discloses a protection ring of a gallium nitride-based active device, and relates to a new generation of information technology. The guard ring includes an ohmic contact layer arranged on the substrate to form a closed loop, and a first metal layer is stacked on the ohmic contact layer; the first metal layer is connected to the second metal layer above through a vertical through hole, The second metal layer is provided with a microstrip line, and the microstrip line is connected in series with the lumped capacitor and is electrically connected to the ground via. The advantage is that by adjusting the size of the lumped capacitor reasonably, the ground impedance of the guard ring can be minimized, and the high-frequency noise generated by the active devices in the ring can be effectively absorbed and exported to the reference ground plane. Simulation tests show that adding a guard ring can improve high-frequency noise isolation by more than 10dB. The disposition of the first metal layer can reduce the parasitic resistance of the ohmic contact layer.

The invention provides an installation device and method of a radio frequency power amplifier with radiating and grounding performances. The installation device comprises a radiating base, a PCB (printed circuit board) and a U-shaped fixed seat, wherein the PCB is tightly covered on the upper surface of the radiating base, a center hole is formed on the PCB, the radio frequency power amplifier is placed in the center hole, the shape of the enter hole is matched with the packaging configuration of the radio frequency power amplifier, and a pair of input and output pin welding discs and a pair of grounding welding discs are distributed along the surrounding edge of the center hole; the U-shaped fixed seat comprises a middle U-shaped seat body, end ears are arranged on the two upper sides of the U-shaped seat body, an internal groove of the U-shaped seat body provides a fixing position for the power amplifier, and the end ears on the two sides of the seat body are provided with fixing holes; and the U-shaped fixed seat, the PCB and the radiating base are connected with one another by virtue of screws or bolts. The installation device can be utilized to provide the installation method with low cost of the power amplifier, can ensure the good grounding and radiating performances of the power amplifier, can improve the performance consistence of the power amplifier, and is convenient to be produced and assembled.

A display device includes a display panel, a circuit board and a conductive element. The circuit board is adjacent to the display panel and is electrically connected to the display panel. The circuit board has at least one conductive pattern arranged in a grounding area. The conductive pattern includes a plurality of conductive parts arranged at intervals. These conductive parts are arranged along a first direction and a first direction. The quantity of the two directions is multiple respectively, and the first direction is substantially perpendicular to the second direction. The conductive element is disposed on the conductive pattern, and the conductive element is electrically connected to these conductive parts. The present invention can not only reduce the grounding impedance between the conductive element and the grounding area, but also improve the lateral thrust resistance of the conductive element. Therefore, problems such as poor contact or falling off of the conductive element can be avoided, and the electromagnetic interference and static electricity of the display device can be improved. discharge protection.

The invention discloses a novel unidirectional microphone, which comprises a dust-proof net, a casing, a circuit board, a vibrating film, a cavity, a back pole, and conductive glue. A sound groove is set between the glue, a micro-shaped exhaust groove is set in the cavity, and an exhaust hole is set in the outer shell. The exhaust hole corresponds to the micro exhaust groove of the cavity to form an acoustic cavity exhaust system, so that the present invention can filter out ambient noise. , to reduce the sound in other directions, so as to collect clear high-fidelity sound in one direction, and the invention is specially designed for the vehicle with a consistent mechanical structure, with better use effect and longer life.

The invention discloses a carbon fiber composite alloy grounding body. The carbon fiber composite alloy grounding body comprises a shell and a grounding steel band; the shell is a carbon fiber composite shell; the shell is filled with an electrolyte filling material; the electrolyte filling material is plugged with an alloy grounding body; a red copper rod core body runs through in the alloy body; a pair of sealing openings and filler openings are formed in the two sides of the shell respectively; one end of the red copper rod core body runs through from the filler openings to the outside of the shell and is connected with the grounding steel band through a set connecting bus; a sealing apparatus used for fixing and sealing the red copper rod core body is arranged in the filler openings; and the carbon fiber composite alloy grounding body can play the effects of lowering corrosion speed, lowering resistance and realizing voltage sharing, and is relatively low in construction cost and free of influence to the surrounding soil.