Fig 1 - available via license: Creative Commons Attribution 4.0 International
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Reflection calibration of a single port using the ECal and deembedding at the calibration plane (dotted line). The interaction between antennas and the test phantom is illustrated with arrows.
Source publication
Multitude of antennas are typically used in microwave imaging systems. Here we outline a simple and effective calibration method for multiport imaging systems. By using only one additional component, an electronic calibration module (ECal), one port is calibrated and the calibration plane is thereby moved to the antenna connector. Assuming all ante...
Contexts in source publication
Context 1
... can be water and alcohol if the system can be filled with liquids. Alternatively, solid or gel phantoms can be used if the distance between antennas and phantom is matched. The knowledge of the exact permittivity of the phantom materials is thereby not necessary. Thirdly, one ECal module has to be installed on one of the antennas as shown in Fig. 1. The ECal module is thereby permanently kept in the imaging system at this specific antenna and it is not removed during the complete calibration ...
Context 2
... performing a standard reflection calibration procedure, the calibration plane is defined at the ECal connector connected to the VNA port. To shift the calibration plane to the antenna connector ( Fig. 1 dashed red line) the ECal is switched into its "thru" state and the "thru" is de-embedded. Since the "thru" state of the ECal is known its influence on all following measurements can be mathematically removed.. ...
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