TRL Board v0.3 (PCB 1.6mm) 4 Layers OSHPark For more details see GitHub 4Layers_trl-board_v0_3

This board is based on Mario Hellmich’s design see https://www.mariohellmich.de/projects/trl-cal/trl-cal.html

TRL Calibration Board for evaluation of Southwest Microwave 1092-02A-5(up to 40 GHz) or BELFUSE / Cinch 142-0771-831(Up to 26.5GHz) or cheap SMA connectors. 50 Ohms Impedance matched with OSHPark 4Layers FR408-HR

It contains following features:

• A thru standard for TRL

• A 50 Ohms match standard

• A 25 Ohms mismatch standard for verification

• An open standard for verification

• A short standard, used as a reflect standard for TRL

• A line of 45 mm length (Called also “Line 76mm” to reflect total length), used as a line standard for TRL

• A series fixture for 0402 components

• A shunt fixture for 0402 components

The board is designed assuming the following parameters (based on OSH Park 4 Layers 190Tg FR408-HR specifications):

• Base Material / Board thickness: 1.6 mm (63 mil)

• Conductor Height 0.17mm FR408-HR

• Center Conductor Width: 0.36 mm (14.17 mil)

• Gap Width: 0.25 mm (9.84 mil)

• Permittivity: FR408-HR 3.66 (3.68 @2GHz)

• Loss Tangent: 0.0092 @2GHz

• Copper Weight: 1oz outer (35µm), 1/2oz inner (17.5µm)

• Trace surface: Cu + ENIG

• Impedance: 50 Ohms (+/-2 Ohms)

• PCB Finish: ENIG (Gold)