That left very little room for traces on the 2-mm-wide arms, so the PCBs had to have four layers, which raised eyebrows at the PCB house when [Sasa] submitted the design. Such an airy and open ...

Every PCB house and line within it is different from the next, so it is critical to get hold of the layer arrangement, foil and dielectric thicknesses, dielectric constants, and loss tangent figures.