A study of the E-field dependence of resonant modes of a layered semi-ball immersed in lossy liquid

Abstract

The amplitude–frequency dependences of a dielectric layered semi-ball resonator placed in a high loss liquid were studied experimentally and theoretically. It was determined that at definite relations between real and imaginary parts of complex permittivity of high loss liquid the electromagnetic field extrusion effect was observed. The extrusion effect means that the region of strongest E-field becomes displaced when the surrounding liquid has high loss, and may end up inside the resonator. Such an effect takes place when the resonator is immersed into the liquid with real and imaginary parts of complex permittivity that are much greater than 1 and the imaginary part is higher than the real one. Liquids with various real and imaginary parts of complex permittivity were studied. The existence conditions for the electromagnetic field extrusion effect were found. The influence of this effect on the measurement of complex permittivity of a high loss liquid using a sapphire layered semi-ball resonator was observed.