| characteristic impedance
|-
! scope="row" | strip_lencenter_len
| real numeric
| meters
| - 0.03
| length of the line segment
|-
| real numeric
| meters
| - 0.035
| length of feed line (only in [[EM.Tempo]])
|-
| real numeric
| meters
| - 0.1
| length of substrate (only in [[EM.Tempo]])
|-
| real numeric
| meters
| - 0.05
| width of substrate (only in [[EM.Tempo]])
|-
| strip width
|-
! scope="row" | sub_lenbox_multiplier
| real numeric
| meters
| -
| length of substrate
|-
! scope="row" | sub_wid
| real numeric
| meters
| -
| 10 | ratio of width of substrate to strip width
|-
! scope="row" | draw_substrate