The microstrip is a very simple yet useful way to create a transmission line with a PCB. There are some advantages to using a microstrip transmission line over other alternatives. Modeling approximation can be used to design the microstrip trace. By understanding the microstrip transmission line, designers can properly build these structures to meet their needs.
A microstrip is constructed with a flat conductor suspended over a ground plane. The conductor and ground plane are separated by a dielectric. The suface microstrip transmission line also has free space (air) as the dielectric above the conductor. This structure can be built in materials other than printed circuit boards, but will always consist of a conductor separated from a ground plane by some dielectric material.
Models have been created to approximate the characteristics of the microstrip transmission line.
The source of this formula is based on Wheeler’s equation.
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