Transmission Line Testboard

A simple PCB designed according to JLC23313 layer stackup

There are many different impedance controlled transmission lines, with the most common Zo = 50 Ohm / Zdiff = 100 Ohm

• Coplanar Waveguide (Single / Differential)

• Microstrip (Single / Differential)

• Stripline (Single / Differential):

  A impedance controlled Via and a set of differential vias gets the stripline up to a coplanar waveguide to the sma connectors For a future version vertical SMA mounts would be better to avoid vias where the goal was to proof impedance control calculations.

• 90° track (as Coplanar Waveguide)

  I put this track on the pcb to measure the effects of 90° bends on transmission lines.

• 50% top 50% bottom track connected by 50 ohm via: to verify impedance of via if the coplanar waveguide calculations are all correct.

Parameters @ production:

Base Material: FR-4
Layers: 4
Dimension: 100 mm* 100 mm
PCB Qty: 5
Product Type: Industrial/Consumer electronics
Different Design: 1
Delivery Fomat: Single PCB
PCB Thickness: 1.6
Impedance: yes JLC2313
PCB Color: Green
Silkscreen: White
Surface Finish: HASL(with lead)
Deburring/Edge rounding: No
Outer Copper Weight: 1
Inner Copper Weight: 0.5
Gold Fingers: No
Flying Probe Test: Fully Test
Castellated Holes: no
Remove Order Number: Yes
Min hole size/diameter:0.2/0.45mm
4-Wire Kelvin Test:No
Material Type:FR4-Standard Tg 130-140C
Paper between PCBs:No
Appearance Quality:IPC Class 2 Standard
Confirm Production file:Yes

Credits

I mostly calculated the values with https://www.maartenbaert.be/alterpcb/tlinesim/ which has quite accurate interpretation of all different parts of the pcb. After comparison, this tool was nearly exactly the same to the manufacturer (JLCPCB) regarding a 50 Ohm transmission line with JLC2313 stackup.