Microstrip
Microstrip is a type of transmission line used in electronics, which consists of a flat strip of conductive material placed on a thin layer of dielectric material, which is typically a PCB substrate such as FR4 or Rogers. The conductive strip is usually made of copper and is designed to carry high-frequency signals.
The microstrip is positioned on the top surface of the PCB substrate and is separated from the ground plane by the dielectric layer. The ground plane can be on the bottom of the PCB or on a separate layer within the PCB. The structure of the microstrip is similar to a parallel plate capacitor, with the conductor acting as one plate and the ground plane acting as the other.
The characteristic impedance of the microstrip is determined by the dimensions of the conductor, the thickness of the dielectric layer, and the relative permittivity (dielectric constant) of the substrate material. A wider conductor will have a lower characteristic impedance, while a narrower conductor will have a higher characteristic impedance. A thicker dielectric layer will also result in a higher characteristic impedance.
Stripline
A stripline is a type of transmission line used in electronics, which consists of a flat strip of conductive material sandwiched between two parallel planes of ground conductors on either side. The conductive strip and the ground planes are separated by a dielectric material, which is typically a thin layer of a material such as FR4 or Rogers
The structure of a stripline is similar to that of a microstrip transmission line, with the main difference being that the conductor is sandwiched between the ground planes rather than placed on top of the dielectric material. This provides better shielding and isolation from external noise and interference, as the signal is enclosed between the ground planes.
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