TRL Calibration

Meaning

Vector network analyzer calibration techniques use transmission lines of known length to define the measurement reference planes on planar substrates. Test engineers use trl calibration to measure on-board devices at microwave frequencies where coaxial standards cannot be used.

Reference Structure

Thru, reflect, and line standards are routed directly on the test board to match the exact substrate and copper thickness of the final product. The thru standard provides a zero-length reference path, while the line standard introduces a known phase shift. The reflect standard provides high return loss but does not require a precise phase value.

System Error

Systematic errors introduced by probe transitions are calculated and removed using the measured responses of these three on-board structures. This process is highly accurate because it uses the actual board material as the reference medium instead of external coaxial parts. The resulting data represents the isolated performance of the device under test.

Calibration Standard

Frequency range limits are determined by the physical length of the line standard, which must be between twenty and one hundred and sixty degrees of phase shift. Multiple line standards are required to cover a broad frequency band on the same test board. This routing demand increases the board area needed for testing but guarantees high precision at millimetre-wave bands.

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