Focus Microwaves - RF Test Fixtures
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.
Modular RF Power Transistor Test Fixtures
Model |
Frequency |
Connector |
PTJ-S | DC - 4 GHz, TRL Calibration standards | N, 7mm, SMA, 2.9mm, 3.5mm |
PTJ-C | DC - 6 GHz, TRL Calibration standards | N, 7mm, SMA, 2.9mm, 3.5mm |
PTJ-X | DC - 12 GHz, TRL Calibration standards | N, 7mm, SMA, 2.9mm, 3.5mm |
PTJ-Ku | DC - 18 GHz, TRL Calibration standards | N, 7mm, SMA, 2.9mm, 3.5mm |
PTJ-Ka | DC - 26 GHz, TRL Calibration standards | 2.9mm, 3.5mm |
PTJ-Klop | Klopfenstein, custom design | N, 7mm, SMA, 2.9mm, 3.5mm |
Add-On Options
Model |
Description |
TRINW | Transistor Insert with water cooling option |
WCP | Water cooling pump for water cooling option |
XDEL | Extra delay line, standard |
XTRIN | Extra Transistor Insert, Standard |
XTRFS | Extra Transistor Substrate, Custom |
TRFS-CUS | Extra Transformer Substrate, Custom |
XTRCLP | Extra Transistor Clamp, flush mount |
Minimum Loss Test Fixture (MLTF) Coaxial
Model |
Frequency |
Connector |
MLTF-C | DC - 4 GHz | 7mm, N, 7/16 |
MLTF-X | DC - 12 GHz | 7mm, N |
MLTF-Ku | DC - 18 GHz | 7mm, 3.5mm |
MLTF-Ka | DC - 26.5 GHz | 3.5mm |
Minimum Loss Test Fixture (MLTF) Coaxial
Model |
Frequency |
Connector |
MLTF-C | DC - 4 GHz | 7mm, N, 7/16 |
MLTF-X | DC - 12 GHz | 7mm, N |
MLTF-Ku | DC - 18 GHz | 7mm, 3.5mm |
MLTF-Ka | DC - 26.5 GHz | 3.5mm |
More Product Information

- On-Off power switch
- 20 A Circuit Breaker
- 8’ Flexible Power Cord
- Outlets – (4) 5-20R
- 3ft.
- (2) fork terminals (current)
- (1) fork terminals (ground)
- (2) Shielded Banana (voltage)

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On-Off power switch
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30 A Circuit Breaker
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Inlet - NEMA L6-30
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Outlets – NEMA L6-30R
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3ft.
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(2) fork terminals (current)
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(1) fork terminals (ground)
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(2) Shielded Banana (voltage)

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Replace costly and inflexible test fixtures with easy-to-use probe tips
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Long lifetime – typically over 1,000,000 contacts
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GS/SG footprint up to 4 GHz and GSG up to 20 GHz
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High-power RF test: up to 30 Watts
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Test at temperatures from -60°C to 200°C

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3 Measurement States; Quiescent (OFF-State), Non Quiescent (ON-State), and Pre-State
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The Pre State is a short high voltage state used to activate
the traps in the semiconductor.
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Adjustable delay (Δt) between the Pre state and Non Quiescent state down to 0s.
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Independently adjustable timing settings for the Three-state gate pulser and drain pulser
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Easy Integration into existing mainframes

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Real resistors switched by relays
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14 decade range, resolution from 1 μΩ
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Custom units and time sequences
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No residual resistance
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5 W load capacity
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Six different languages
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On-Off power switch
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20 A Circuit Breaker
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Outlets – (2) Universal
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3ft.
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(2) fork terminals (current)
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(1) fork terminals (ground)
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(2) Shielded Banana (voltage)

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Type APS-H CMOS sensor
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IEEE 1588 PTP
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Power over Ethernet
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4.59 fps at full resolution
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Extended near-infrared (GT5120NIR) model
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GigE Vision interface with Power over Ethernet
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Screw mount RJ45 Ethernet connector for secure operation in industrial environments
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Supports cable lengths up to 100 meters (CAT-6 recommended)
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Trigger over Ethernet Action Commands allow for a single cable solution to reduce system costs
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Comprehensive I/O functionality for simplified system integration
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Planarity adjusted (PA) EF Lens Mount (option -18) for electronic control of aperture and autofocus
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Easy camera mounting via standard M3 threads at all sides and 1/4-20 tripod mounting hole
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Easy software integration with Allied Vision's Vimba Suite and compatibility to the most popular third party image-processing libraries.
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Enhanced Defect Pixel Correction feature with a new Defective Pixel List Manager tool that allows you to load different user defined defective pixel lists to match your application and optimize the life cycle of the camera

- Tiny “all-in-one” solution: no external control board needed
- Superior image quality: sub-micron lens movement with very low tilt. Now with higher dynamic stability
- Low voltage & power: 3.3 VDC input, zero power position hold
- Simple system integration: accepts high-level motion commands over standard serial interface (I2C or SPI)
- Flexible, production-ready system: compatible with M8 to M16 lenses and with typical image formats from 1/3” to 1/1.8”
- Lowest cost, fastest time to market: Fully-engineered “plug and play” solution

Food and beverage technology is changing the global food and beverage industry from production to delivery. Consumer and market demand for sustainable and healthy products also means stricter regulations that promote safe consumption, sustainable package production, and effective recycling or disposal. These trends add up to a heightened demand for organizations in the industry to commit to testing protocols that ensure food safety, quality, and compliance with evolving standards. Facilities and manufacturers face challenges such as implementing advanced traceability systems, ensuring the safety and efficacy of new ingredients and packaging materials, and adhering to rigorous environmental regulations. Additionally, the rise of automation and digitalization in food production results in new challenges related to interoperability and cybersecurity. Testing facilities must adapt swiftly to support R&D efforts, ensuring the safe, efficient, and compliant production of innovative food and beverage products in a rapidly changing market landscape.

Focus Microwaves
Focus Microwaves is a pioneering engineering company, built around the innovations of its founder Dr. Christos Tsironis who developed his first manual tuner in 1973 and is the inventor of most existing electro-mechanical tuner families. The success of Focus is based on the engineering and manufacturing skills of its highly motivated and experienced team of engineers and technicians, who have been trained and encouraged to develop new technologies. In addition, listening to our customers needs and insights helps us discover and develop new and measurement methods on an ongoing basis, relentlessly pushing the limits of what is possible.
From humble beginnings in 1988, Focus has become the main supplier of advanced Load Pull and Noise Tuner Systems. Our mission is to provide effective, reliable and innovative solutions for non-50 Ohm testing (Noise and Load Pull) of RF microwave transistors, thus enabling our customers to compete in the marketplace with better designs and to advance the understanding and knowledge of the field.
Contact Details
Focus Microwaves Inc. Main Head Office
4555 Chem. du Bois-Franc, Saint-Laurent, QC H4S 1A8, Canada
Phone: +1-514-684-4554
Test & Measurement
