Coplanar waveguide is a type of electrical
Coplanar waveguide was invented in 1969 by Cheng P. Wen, primarily as a means by which non-
The electromagnetic wave carried by a coplanar waveguide exists partly in the
Nonreciprocal gyromagnetic devices depend on the microwave signal presenting a rotating (circularly polarized) magnetic field to a statically magnetized
The dielectric substrate has no direct effect on the magnetic field of a microwave signal travelling along the CPW line. For the magnetic field, the CPW is then symmetrical in the plane of the metalization, between the substrate side and the air side. Consequently, currents flowing along parallel paths on opposite faces of each conductor (on the air-side and on the substrate-side) are subject to the same inductance, and the overall current tends to be divided equally between the two faces.
Conversely, the substrate does affect the electric field, so that the substrate side contributes a larger capacitance across the slots than does the air side. Electric charge can accumulate or be depleted more readily on the substrate face of the conductors than on the air face. As a result, at those points on the wave where the current reverses direction, charge will spill over the edges of the metalization between the air face and the substrate face. This secondary current over the edges gives rise to a longitudinal (parallel with the line), magnetic field in each of the slots, which is in