Calibration and Tuning Using Compact Multi Frequency-Range Impedance Tuners / 8,896,401

Number: 
8,896,401
Date: 
Monday, November 25, 2013
Abstract: 

A calibration and impedance synthesis method applies to automatic multi frequency-range
electro-mechanical impedance tuner which cover frequencies from a low megahertz to a high
gigahertz range; this is possible by cascading a high frequency tuner module with one or two
low frequency tuner modules; the low frequency module(s) are made using either “variable
phase shifter-capacitor” or “multi-capacitor-transmission line tuner” structures. The high
frequency module is a single, double or triple probe slide screw tuner, with the individual probes
covering adjacent frequency bands. Calibration is measuring S-parameters of each tuner module
on a VNA, cascading in memory and saving in cal-files. Tuning employs search routines in
calibration data base targeting the closest calibrated point versus a user defined impedance.