Components for building calibration loads

BNC Connectors

eBay:

• BNC male plug center solder PCB mount RF connector

• 10pcs BNC male plug center solder PCB mount RF connector

SMA Connectors

eBay:

• 2pcs connector SMA male plug solder PCB clip edge mount straight M

• 10pcs connector SMA male plug solder PCB clip edge mount straight M

Resistors

50-ohm Load (2x 100-ohm in parallel) and 100-ohm Load

Specification:

• • Composition: thin-film

  • Resistance: 100-ohm

  • Tolerance: +-0.1%

  • Temperature coefficient: +-25ppm/ºC

  • Package: 0603

Examples:

200-ohm Load

Specification:

• • Composition: thin-film

  • Resistance: 200-ohm

  • Tolerance: +-0.1%

  • Temperature coefficient: +-25ppm/ºC

  • Package: 0603

Examples:

eBay: 200 OHM 0.1% 0603 25ppm Resistor RN731JTTD2000B25 KOA NEW Qty:100pcs

Note: could be used as well for the 50-ohm load (x4 in parallel) and the 100-ohm load (x2 in parallel)

Assembly examples

Notes:

• • 50-ohm, 100-ohm and 200-ohm loads shown above were manufactured with 200-ohm resistors

  • The center pin of the connectors was trimmed down

  • 100-ohm and 200-ohm loads are not required for calibration

Useful links about building calibration loads

http://blog.kotarak.net/2009/10/n2pk-vna-calibration-standards.html

http://blog.kotarak.net/2010/04/n2pk-vna-sma-calibration-standard.html

http://www.qsl.net/in3otd/electronics/VNA_calkit/calkit.html