Coplanar linesΒΆ
A coplanar transmission line is a type of transmission line where the signal strip and ground planes are all located on the same side of the substrate. It is commonly used in microwave devices and MMICs due to its better isolation compared to microstrip lines.
By design, the coplanar transmission line is a dielectric substrate on the surface of which 3 electrodes are located:
When a wave propagates along a coplanar line, part of the field goes out, since the coplanar line does not have metal borders on all sides, unlike, for example, rectangular waveguides.
Effective permittivity of coplanar line
Imagine an environment in which the field will have the same magnitude as the field of a coplanar line. The (relative) permittivity of such a medium will be called the effective (relative) permittivity of the line.
Contents:
- Effective permittivity of coplanar transmission line when distance is greater than thickness
- Effective permittivity of coplanar transmission line when distance is less than thickness
- Wave impedance of coplanar line when hyperbolic sine ratio squared is between \(0\) and \(\frac{1}{2}\)
- Wave impedance of coplanar line when length to distance ratio squared is between \(\frac{1}{2}\) and \(1\)