A novel four port device for complex permittivity measurement is presented consisting of the cascade of two 3 dB branch line directional couplers connected through two U-shaped transmission line lengths. The material under test (MUT) is brought into contact with one U-shaped section. The complex dielectric permittivity of the MUT is evaluated by simply measuring the amplitudes of the two outputs, thus obtaining a simple and cheap measurement procedure. A prototype has been fabricated and experimentally tested exhibiting very good accuracy.
A Novel Technique for Complex Permittivity Measurements Based on a Four Port Device
OCERA, ALESSANDRO;DIONIGI, Marco;FRATTICCIOLI, ELISA;SORRENTINO, Roberto
2005
Abstract
A novel four port device for complex permittivity measurement is presented consisting of the cascade of two 3 dB branch line directional couplers connected through two U-shaped transmission line lengths. The material under test (MUT) is brought into contact with one U-shaped section. The complex dielectric permittivity of the MUT is evaluated by simply measuring the amplitudes of the two outputs, thus obtaining a simple and cheap measurement procedure. A prototype has been fabricated and experimentally tested exhibiting very good accuracy.File in questo prodotto:
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