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New thermometer for RF and microwave thermal therapy using MMIC in Si BJT VCO type

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5 Author(s)
Y. Kotsuka ; Dept. of Telecommun. Eng., Tokai Univ., Kanagawa, Japan ; K. Orii ; H. Kojima ; K. Kamogawa
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A new wireless-thermometer is proposed for thermal therapy that uses a silicon bipolar transistor voltage controlled oscillator (Si VCO), based on three-dimensional (3D) MMIC technology. The method for detecting temperature is examined. As the result, the VCO's oscillation frequency (around 4.35 GHz) is extremely linear against temperature from 30/spl deg/C to 50/spl deg/C. Tests using a phantom material show that a prototype thermometer can be read through at least 7 cm of soft tissue.

Published in:

Microwave Symposium Digest, 1999 IEEE MTT-S International  (Volume:2 )

Date of Conference:

13-19 June 1999