Regular TRL calibration, described in the section TRL Calibration uses several LINEs of different lengths for frequency extension. It is provided by the method of dividing the frequency band into separate sub-bands.
Multiline TRL calibration also uses several LINEs, but it does not divide the frequency band into several sub-bands. Instead, all the LINEs are used simultaneously over the whole calibration bandwidth. The redundancy of the LINEs measurements allows for both extending the frequency range and increasing the calibration accuracy. The number of LINEs should be no less than three. The more LINEs are used, the higher the accuracy will be achieved.
To employ multiple LINEs in the calibration procedure, use the same method of standards subclasses assignment as in the regular TRL calibration (See Calibration Standard Class Assignment). Defining frequency limits to calibration standards is not necessary for Multiline TRL calibration method.
The following table shows the differences between the regular and Multiline TRL calibrations when entering the data into the calibration standards editing menu.
Calibration Standard |
Data in Calibration Kit Manager |
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TRL |
Multiline TRL |
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REFERENCE LINE or THRU |
1. Type: THRU/LINE 2. Min and max frequency 3. Delay1 4. Class: TRL THRU |
1. Type: THRU/LINE 2. Delay1 3. Class: TRL LINE/MATCH or TRL THRU The total number of LINEs is no less than 3. |
LINE |
1. Type: THRU/LINE 2. Min and max frequency 3. Class: TRL LINE/MATCH |
|
MATCH (optional) |
1. Type: MATCH 2. Min and max frequency 3. Class: TRL LINE/MATCH |
1. Type: MATCH 2. Class: TRL LINE/MATCH |
REFLECT |
1. Type: SHORT or OPEN. 2. Min and max frequency. 3. Model parameters, which allow calculating value of phase response within ±90°. 4. Class: TRL REFLECT. |
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1 The delay for coaxial airlines is equal to , where L is the length of the LINE, and ν is the wave velocity in LINE equal to 2.9979·108 m/s. |
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If a calibration kit for Multiline TRL has been created and edited, it is possible to switch between normal and multiline TRL calibrations a specific button in the TRL calibration menu, shown below.
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To toggle between normal and Multiline TRL calibrations, use the Multiline softkey.
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