Selecting the correct calibration kit to use with your VNA.

The calibration kit should be chosen based on two main things:

  1. The connector on the devices you wish to test. The connector type on your VNA is totally irrelevant when selecting a VNA calibration kit.
  2. The frequency range you wish to test devices to.

Selecting the right connector type on the calibration kit

If you only want to test SMA devices, but your VNA has N connectors, then you need an SMA calibration kit and do not need an N calibration kit. Many people make the mistake of thinking they need an N calibration kit if their VNA has N connectors. If you wish to test waveguide components, you need a waveguide calibration kit. Many VNAs sold have APC7 connectors on them. Despite being a precision connector, it use is relatively rare in 2017, so most people do not need an APC7 calibration kit, even if their VNA has APC connectors. The table below should help clarify this.

SMA, 3.5 mm and 2.92 mm(K) connectors are mechanically compatible. An SMA kit can calibrate SMA, 3.5 mm or 2.92 mm devices, although the upper frequency limit of 3.5 mm and 2.92 mm extends beyond that of SMA connectors. Generally SMA connectors are considered rated up to 18 GHz, 3.5 mm up to 26.5 GHz and 2.92 mm (K) up to 40 GHz

Connector on DUTConnector on VNASuitable calibration kit
SMA3.5 mmSMA
SMA2.92 mm or KSMA
SMA2.4 mmSMA
N3.5 mmN
N2.92 mm / KN
N2.4 mmN
3.5 mmAPC7SMA
3.5 mmNSMA
3.5 mm3.5 mmSMA
3.5 mmSMASMA
3.5 mm2.92 mm or KSMA
3.5 mm2.4 mmSMA
WR90 WaveguideAPC7WR90 Waveguide
WR90 WaveguideNWR90 Waveguide
WR90 Waveguide3.5 mmWR90 Waveguide
WR90 WaveguideSMAWR90 Waveguide
WR90 Waveguide2.92 mm / K WR90 Waveguide
WR90 Waveguide2.4 mm WR90 Waveguide

Kirkby Microwave sell calibration kits for SMA (our most popular), N and waveguide calibration kits. Waveguide kits tend to be built to order, so please contact us about those.

Selecting the right frequency range for the calibration kit

Kirkby Microwave sell the following ranges of kits as standard.

  1. SMA up to 7 GHz. The Kirkby Microwave 85033 7 GHz SMA calibration kit is is our most common standard product.
  2. SMA up to 8, 9, 10, 11 GHz or 12 GHz are available to special order. Please contact us
  3. N 18 GHz. The 85054 kit is an 18 GHz kit, although to keep costs down, it is usually supplied with loads suitable only to 6 GHz. For use above 6 GHz, different loads are required. Please contact us for more information about N kits with 18 GHz loads, as these are not always available.

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