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Matching Impedance Is An Important Part Of The PCB

Matching Impedance is a characteristic of Radiofrequency or microwave design. The impedance equal to 50 ohms is required to effectively transmit the signal’s power from input to destination loaded with minimum distortions.

Suppose impedance does not match at input and output. There can be a signal loss, power cannot be transferred to production, or distortion may arise, leading to vertical waves. That ratio can approach infinity.


But if Matching Impedance is matched. Then the problem of distortion or standing waves cannot occur. Or it can be a low vertical wave fraction in terms of voltage. But it is not easy to maintain impedance equal to 50 oms during transmission of a signal from input to output. To uphold the impedance, Stripline or microstrip technologies are used.

It displays impedance of the transmission line is contrarily relative to the line girth and specifically. Corresponding to the wideness of the substantial dielectric layers.

One contrast between microstrip and stripline is that. The stature of the flag follow over the ground for Stripline has less of an effect on impedance. It is more effective than the stature of a microstrip flag follow over the floor. The air above a microstrip schematic will contribute to the specific impedance. It displays the impedance of the transmission line. As contrarily relative to the line girth. And explicitly corresponding to the perimeter of the substantial dielectric layers.

Matching Impedance.png

If the circuit while a stripline schematic is confined to the interior. That of a sandwich of dielectric material. Air will constantly work to lower the operating dielectric constant of PCB solid. It is used in a microstrip schematic.

Due to this condition. The operative dielectric constant of PCB components is used in a stripline schematic. It will be greater than the dielectric constituents used in a microstrip schematic.

2.Matching ImpedanceConclusion

By the wideness of the metal conduit layer utilized for the transmission lines. The size of the flag-shaped on that layer. And the wideness of the dielectric substrate. Smith’s chart is used to acquire an impedance matching.

Hommer Zhao
Hi, I am Hommer, the founder of WellPCB. So far, we have more than 4,000 customers worldwide. If you have any questions, you can feel free to contact me. I really appreciate any help you can provide.