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Components for building calibration loads

posted Mar 25, 2014, 2:58 PM by Melchor Varela   [ updated May 24, 2016, 10:43 PM ]

BNC Connectors


SMA Connectors

eBay:

eBay: 10 x SMA Female Plug Center Solder PCB Clip Edge Mount RF Coaxial Connector



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:

DigiKey P/N

Manufacturer P/N

Description

P100DBCT-ND

ERA-3AEB101V

RES 100 OHM 1/10W .1% 0603 SMD

RG16P100BCT-ND

RG1608P-101-B-T5

RES 100 OHM 1/10W .1% 0603 SMD

P100YCT-ND

ERA-3YEB101V

RES 100 OHM 1/10W .1% 0603 SMD


200-ohm Load

Specification:

  • Composition: thin-film
  • Resistance: 200-ohm
  • Tolerance: +-0.1%
  • Temperature coefficient: +-25ppm/ºC
  • Package: 0603

 Examples:

DigiKey P/N

Manufacturer P/N

Description

P200DBCT-ND

ERA-3AEB201V

RES 200 OHM 1/10W .1% 0603 SMD

RG16P200BCT-ND

RG1608P-201-B-T5

RES 200 OHM 1/10W .1% 0603 SMD



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

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