Managing Dielectric Loading Shifts in Encapsulated Dual Band Antenna Assemblies
Encapsulating dual band antennas requires pre-tuning trace geometry to offset lower band and upper band dielectric loading shifts before molding.
Coaxial Test Calibration
Meaning
Systematic error correction procedures establish a defined measurement reference plane at the end of a coaxial cable assembly. Through coaxial test calibration, the vector network analyzer mathematically removes the tracking, mismatch, and crosstalk errors introduced by the cables and connectors. The process remains valid only up to the physical interface where the calibration standards are attached.
Error Characterization
Mathematical algorithms compute the twelve-term error model of the measurement system by measuring known standards. During the coaxial test calibration, the analyzer compares measured responses against the stored ideal models of open, short, load, and thru standards. Discrepancies between the measured and expected values represent the systematic errors of the hardware.
Reference Plane
The electrical boundary of the measurement shifts to the physical tips of the cables. A precise coaxial test calibration ensures that measurements are referenced directly to the device under test.
Measurement Traceability
Reference standards are calibrated by primary metrology laboratories to ensure international consistency. Performing a regular coaxial test calibration with certified kits maintains the validity of the measurement results during official compliance audits. The accuracy of the test setup depends on the mechanical integrity of the precision connectors used during this sequence.
Dirt or wear on the connector faces can introduce insertion loss variations that invalidate the entire error model.