TDR impedance HDI multi-layer
flexible board More than four
layers of flexible and rigid board
Multilayer flex board
Four-layer flex-rigid board
Single/Double FPC
Twenty to eighteen layers of flex-rigid boards, first to third-order HDI flex-rigid boards, three to twelve layers and more Layer flex board, line width
line spacing is 0.05/0.075mm, various TDR characteristic impedance flex boards and flex-rigid boards