Improvement on Identification Technique of Primary Tumor Using Ring Resonator with Oscillator Circuit at Centimeter Frequency Bands

Abstract

As an early consideration to identify primary tumors by catching tumor cells circulating in the blood, resonant frequencies of the ring resonator type of electrode having some internal organs such as colon, stomach, lung, and liver have been numerically investigated. Main emphasis is placed on the improvement of identification sensitivity by adding the oscillator circuit consisting of the FET in the ring resonator, because the Q-factor inherent in an internal organ is usually low due to the poor loss tangent. Comparing the sensitivity of the conventional ring resonator type of electrode, it has been improved because the oscillation frequency inherent in an internal organ can be easily observed thanks to the oscillator condition with negative resistance. And thus, the validity of the proposed technique has been confirmed.