V.G. Tikhomirov1, S.V. Chizhikov2

1 St. Petersburg State Electrotechnical University «LETI» (St. Petersburg, Russia)

2 Bauman Moscow State Technical University (Moscow, Russia)

2 LLC Scientific and Production Innovative Company “Hyperion” (Moscow, Russia)

Currently, there is a growing interest in medical practice in such a method of examining human internal organs as microwave radiothermometry. This method allows you to measure and display the internal temperature of the patient on the device screen, thereby providing the possibility of detecting oncological diseases in the early stages. However, a number of strict requirements are imposed on the parameters of radiometric receivers, which are the main elements of the radiothermograph, including the amplification path, which is built on the MSU on pHEMT on AlGaAs/GaAs heterostructures.

Using numerical modeling methods, the parameters of an energy-efficient transistor on the proposed heterostructure were investigated. The mathematical modeling made it possible to identify the dependence of the influence of the topology of the base transistor on the static characteristics and to determine the optimal design of the transistor as part of the MIS for microwave radiothermometry.

After analyzing the effect of changing the parameters of various layers on the output characteristics of the device, the topological parameter that most effectively affects the transfer characteristic of the transistor was determined.

A significant increase in the steepness of the transfer characteristic of the proposed transistor design indicates the possibility of using this promising element base as part of microwave radiometers, which will allow combining the principles of multi-channel, multi-frequency and miniaturization in one radiometric complex and will lead to an expansion of its functionality and a significant reduction in size.

The research was carried out with the financial support of the Russian science Foundation in the framework of agreement No. 19-19-00349-П in the theme: “A method and a multichannel multifrequency microwave radiothermography on the basis of monolithic integrated circuits for finding the 3D distribution and dynamics of brightness temperature in the depths of the human body”.

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