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Focus Microwaves provides modular microstrip, high-power, and ultra-low-loss coaxial fixtures designed for load pull testing of packaged transistors. Equipped with TRL calibration standards, these fixtures support transistor packages from under 0.1” to 1” wide. Special features include decade-wide Klopfenstein transformers (Fmax:Fmin ~10:1), water- and air-cooling options, and on-substrate bias networks. Microstrip fixtures (PTJ-x*) offer 50Ω lines, λ/4 or taper transformers, harmonic traps, and DC bias networks, while Minimum Loss coaxial Test Fixtures (MLTF-x*) feature low insertion loss (< 0.03 dB at 2 GHz) with connectors including 7mm, N, and 7/16, spanning up to 18 GHz. Both types support water cooling for RF power up to several hundred Watts.

Manufactured By: Focus Microwaves

Model	Frequency	Connector
MLTF-C	Up to 6 GHz	N type, APC-7
MLTF-Ku	Up to 18 GHz	N type, APC-7
MLTF-X	Up to 12 GHz	N type, APC-7
PTJ-C	DC - 6 GHz	SMA, N type, 3.5 mm, APC-7
PTJ-Ka	Up to 26 GHz	3.5 mm
PTJ-KLOP	Up to 8 GHz	N type
PTJ-Klopf-404	Up to 4 GHz	APC-7
PTJ-Ku	Up to 18 GHz	3.5 mm, APC-7
PTJ-S	DC - 4 GHz	SMA, N type, 3.5 mm, APC-7
PTJ-X	Up to 12 GHz	N type, 3.5 mm, APC-7

RF Accessories Brochure

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Focus Microwaves - RF Test Fixtures DC-26 GHz