Very low frequency tuner with adjustable dielectric

Abstract

A low RF frequency electro-mechanical load pull impedance tuner uses four rotary, remotely controlled variable shunt capacitors and four fixed series transmission lines to create up to 108 independently controllable impedance states at each frequency covering the entire Smith chart in the frequency range between below 1 and 5 MHz; the capacitors and control motors and gear are immersed in a mixture of dielectric fluids inside individual sealed containers including also adequate liquid stirring mechanisms. Appropriate, Error Function based optimization algorithms, allow fast impedance tuning at the fundamental frequency at the output of DUT's operated in high gain compression. Stepper motors, drivers and control software are used to remotely control the variable shunt capacitors of the tuner and allow it to be automated, pre-calibrated and used in an automated load pull measuring setup.

Dependencies are inferred from the claim text.