However, for conventional SOLT (Short-Open-Load-Thru
) calibration method, with the increase of the operating frequency, the parasitic effects caused by the calibration standards increase, especially by the fringing capacitance of the open standard.
Despite the common Short-Open-Load-Thru
(SOLT) method of full two-port calibration, no standard thru-kit is available.
To calibrate the fixture to the C reference planes, the mid-section should be replaced with calibration standards, preferably using short-open-load-thru
(SOLT) below 5 0Hz and thru-reflect-line (TRL) above.
OSLT is often referred to as SOLT (short-open-load-thru
); both terms refer to the same calibration method.
If a TRL calibration is performed instead of a short-open-load-thru
(SOLT) procedure, the only standard needed is a delay line.
This article describes several types of calibration procedures, including short-open-load-thru
(SOLT) and thru-reflect-line (TRL).
In addition to the adapter-removal method, the model HP 8753E performs full two-port calibration with short-open-load-thru
standards (the most accurate method for the model HP 8753E) and thru-reflect-line ([TRL.sup.*]) calibration (useful for in-fixture environments such as microstrip).
In actual practice, it is relatively easy to obtain good calibrations to 50 GHz using the TRL methods, much easier than short-open-load-thru
(SOLT) methods, for example.
In reproducing the results, it was found further that a VNA calibrated using thru-reflect-line (TRL) calibration generally agreed with the scalar analyzer results, but the same VNA calibrated with a short-open-load-thru
(SOLT) calibration did not.
The CD calibration is a simple short-open-load-thru
calibration where each standard has been electrically characterized.