CBCPWConductor-Backed Co-Planar Waveguide
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One way to avoid the high radiation losses of microstrip at high frequencies is through the use of CBCPW transmission lines.
Fabrication costs for stripline are higher than those for microstrip or CBCPW transmission-line structures.
For the CBCPW lines, the full-wave analysis [1] showed that the effective dielectric constant is slightly dispersive and increasing as a function of frequency.
The elevated CBCPW structure, shown in Figure 9, will reduce current crowding at the edge and raise the impedance level.