Focus’ modular microstrip, high power and ultra low loss coaxial  RF Test Fixtures are designed mainly for load pull testing of packaged transistors. All Focus test fixtures come with TRL calibration standards and support most transistor packages sized from less than 0.1″ and up to 1″.

Special designs include:

  • Decade wide (Fmax:Fmin ~10:1) Klopfenstein transformers,
  • Water and Air cooling and
  • On substrate bias networks.
  • Microstrip fixtures (PTJ-x*; Packaged Test Jig) are available with 50Ω lines or built-in λ/4 or taper (Klopfenstein) transformers, harmonic traps and DC bias networks
  • Minimum Loss coaxial Test Fixtures (MLTF-x*) (insertion loss < 0.03 dB at 2 GHz) are available with 7mm, N and 7/16 connectors in frequency ranges up to 18 GHz. (US patent 6,464,513)

Both RF Test Fixture types can be fitted with water cooling for RF power up to several hundred Watts.

(*) ‘-x’ indicates the frequency range: DC-4GHz, -6GHz, -12GHz and -18GHz.

Focus Microwaves Test Fixture kit example

Modular RF Power Transistor Test Fixtures

ID wdt_ID Model Frequency Connector
1 1 PTJ-S DC - 4 GHz, TRL Calibration standards N, 7mm, SMA, 2.9mm, 3.5mm
2 2 PTJ-C DC - 6 GHz, TRL Calibration standards N, 7mm, SMA, 2.9mm, 3.5mm
3 3 PTJ-X DC - 12 GHz, TRL Calibration standards N, 7mm, SMA, 2.9mm, 3.5mm
4 4 PTJ-Ku DC - 18 GHz, TRL Calibration standards N, 7mm, SMA, 2.9mm, 3.5mm
5 5 PTJ-Ka DC - 26 GHz, TRL Calibration standards 2.9mm, 3.5mm
6 6 PTJ-Klop Klopfenstein, custom design N, 7mm, SMA, 2.9mm, 3.5mm

Modular RF Power Transistor Test Fixtures

ID wdt_ID Model Frequency Connector
1 1 PTJ-S DC - 4 GHz, TRL Calibration standards N, 7mm, SMA, 2.9mm, 3.5mm
2 2 PTJ-C DC - 6 GHz, TRL Calibration standards N, 7mm, SMA, 2.9mm, 3.5mm
3 3 PTJ-X DC - 12 GHz, TRL Calibration standards N, 7mm, SMA, 2.9mm, 3.5mm
4 4 PTJ-Ku DC - 18 GHz, TRL Calibration standards N, 7mm, SMA, 2.9mm, 3.5mm
5 5 PTJ-Ka DC - 26 GHz, TRL Calibration standards 2.9mm, 3.5mm
6 6 PTJ-Klop Klopfenstein, custom design N, 7mm, SMA, 2.9mm, 3.5mm

Add-On Options

wdt_ID ID Model Description
1 1 TRINW Transistor Insert with water cooling option
2 2 WCP Water cooling pump for water cooling option
3 3 XDEL Extra delay line, standard
4 4 XTRIN Extra Transistor Insert, Standard
5 5 XTRFS Extra Transistor Substrate, Custom
6 6 TRFS-CUS Extra Transformer Substrate, Custom
7 7 XTRCLP Extra Transistor Clamp, flush mount

Add-On Options

wdt_ID ID Model Description
1 1 TRINW Transistor Insert with water cooling option
2 2 WCP Water cooling pump for water cooling option
3 3 XDEL Extra delay line, standard
4 4 XTRIN Extra Transistor Insert, Standard
5 5 XTRFS Extra Transistor Substrate, Custom
6 6 TRFS-CUS Extra Transformer Substrate, Custom
7 7 XTRCLP Extra Transistor Clamp, flush mount

Minimum Loss Test Fixture (MLTF) Coaxial

wdt_ID ID Model Frequency Connector
1 1 MLTF-C DC - 4 GHz 7mm, N, 7/16
2 2 MLTF-X DC - 12 GHz 7mm, N
3 3 MLTF-Ku DC - 18 GHz 7mm, 3.5mm
4 4 MLTF-Ka DC - 26.5 GHz 3.5mm

Minimum Loss Test Fixture (MLTF) Coaxial

wdt_ID ID Model Frequency Connector
1 1 MLTF-C DC - 4 GHz 7mm, N, 7/16
2 2 MLTF-X DC - 12 GHz 7mm, N
3 3 MLTF-Ku DC - 18 GHz 7mm, 3.5mm
4 4 MLTF-Ka DC - 26.5 GHz 3.5mm

Minimum Loss Test Fixture (MLTF) Coaxial

wdt_ID ID Model Frequency Connector
1 1 MLTF-C DC - 4 GHz 7mm, N, 7/16
2 2 MLTF-X DC - 12 GHz 7mm, N
3 3 MLTF-Ku DC - 18 GHz 7mm, 3.5mm
4 4 MLTF-Ka DC - 26.5 GHz 3.5mm
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