Abstract

 The article is devoted to the development of a printed ultra-wideband miniature antenna that can be used for microwave radiometry. An antenna design with a ring-shaped radiator has been proposed, which provides reception of microwave radiation from biological tissues in the 1800–4600 MHz range. The results of mathematical modeling of the antenna electromagnetic field in biological tissues using the finite difference time domain (FDTD) method are presented. Optimization of the antenna design has been carried out to ensure acceptable matching parameters and optimal antenna functionality. The developed antenna has a height of 6 mm and a calculated mass of 5 g; it is planned to manufacture a dielectric substrate based on PDMS polymer with the addition of barium titanate. The issues of calculating the antenna parameters (measurement depth, resolution and distribution of radiation power over the volume of biological tissue, sensitivity, etc.) are considered. The research results and design parameters of the developed antenna demonstrated the effectiveness of the new antenna and the possibility of its adaptation to the object of research. Considering the presence of an ultra-wide band and miniature dimensions, the antenna can be a sensor of a multi-frequency multi-channel microwave radiothermograph
Highlights
In recent years, the interest of specialists in the use of microwave radiometry (MR) in medicine has been growing
Unlike IR thermography, which visualizes the temperature of the skin, MR allows to measure the temperature of deeper tissues (≈5–7 cm)
To improve the efficiency of diagnostics, it is necessary to develop multi-channel multi-frequency devices that allow monitoring the temperature of biological tissues simultaneously at several points and in different frequency ranges [12], i. e. allow to work in 3D mode
Summary
The interest of specialists in the use of microwave radiometry (MR) in medicine has been growing. An actual problem is to develop a small-sized ultra-wideband antenna, which can be used as part of a multi-channel multi-frequency microwave radiometer, which provides 3D visualization of the distribution of internal thermodynamic temperatures of biological tissues. The device includes a singlechannel miniature radiometer, 8 printed slot antennas (Rogers 3010 material) and a complex 8-channel microwave switch, which in series connect one of the antennas to the input of the radiometer This device is rather miniature, but its antennas do not allow measuring the internal temperature in a multi-frequency mode, they are not broadband. 3. The aim and objectives of research The aim of research is to develop a broadband miniature printed antenna designed to register the own electromagnetic radiation of biological tissues, based on mathematical calculation of its main parameters with subsequent design optimization. VSWR antennas and the calculated antenna parameters (measurement depth, dimensions and shape parameters of the measurement area, temperature rise on the tumor projection, resolution, etc.), described in detail in [14], were used as performance criteria
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