Scalar Load Pull

Optimize your RF and microwave devices with precise impedance tuning using Scalar Load Pull. Achieve maximum power and efficiency with our advanced, pre-calibrated tuners.

Applications Hero Background


In this classic form of load-pull setup, pre-calibrated source and load tuners are directly linked to the input and output terminals of the device under test. The precise calibration of these tuners enables the generation of complex reflection factors in a highly repeatable manner, offering consistency and accuracy in the tuning process.

Power meters positioned at the input of the source tuner and the output of the load tuner are connected via couplers to facilitate the search for optimal gain and output power levels. By manipulating the source and load impedance settings using the pre-calibrated tuners, engineers can synthesize impedance conditions that maximize performance. The key goal is to identify the optimum load impedance, where the complex reflection factor yields maximum output power based on the principles of the maximum power transfer theorem. Similarly, at the input side, the optimum source impedance corresponds to the point where the maximum transducer gain is achieved.

The effectiveness of this load-pull technique hinges on the repeatability and precision of the pre-calibrated tuners. The ability to consistently generate and adjust complex reflection factors ensures reliable and accurate measurements, allowing engineers to fine-tune the source and load impedances to optimize device performance.




The typical scalar load pull setup comprises a signal generator, two RF power sensors, a power meter, some DC bias networks and two fundamental tuners. The input and output passive block comprising of couplers, bias tees are also pre-calibrated, and S-Parameter are defined in the measurement setup.


The parameters measured using the scalar loadpull setup are:

  • ΓLoad, Γsource
  • All spectral quantities like ACPR, EVM and Harmonic Power levels are measured by connecting a Spectrum Analyzer at the output.

Request a quote

Please use this form to creating a quote.

"*" indicates required fields


Request a quote