IMPROVEMENT OF THE ELECTROMAGNETIC FIELD METER IN THE FREQUENCY RANGE OF 30 MHZ - 30 GHZ
The energy of the electromagnetic field of very high, ultra-high and ultra-high frequencies has recently found wide application in almost all spheres of human activity. The necessity of monitoring the electromagnetic field in the frequency range from 30 MHz to 30 GHz is confirmed and the expediency of analyzing the technical limitations of known meters in this range is justified. The technical problem of selective control of electromagnetic radiation at individual frequencies in a wide range from 30 MHz to 30 GHz with the output of measurement results to a computer is considered. The technical limitations of the known devices for monitoring the high-frequency components of the electromagnetic field are revealed: insufficient elaboration of the final output/display device, the absence of intermediate filters in the measuring and supply circuits, the use of thermal converters of electromagnetic energy as a detecting element, the absence of active amplifying elements, intermediate frequency isolation circuits in the signal under study, a microprocessor computing unit and housing shielding. Technical solutions are proposed to solve the considered limitations by combining a broadband antenna, a high-frequency connector, an electromechanical switching unit, a microcontroller, a frequency converter, an attenuator, an amplifier, a reference frequency generator, a logarithmic detector, a bandpass filter, an analog-to-digital converter, a reference voltage source, a liquid crystal display, a microcontroller COM port and a block power supply. The description of the developed device for monitoring the electromagnetic field which takes into account the proposed technical solutions is presented. The possibility of separate control of electromagnetic radiation at separate frequencies is substantiated. The scheme of combining the elements of the developed device and the results of modeling the input spectrum of the electromagnetic signal with a frequency of 433 MHz and the output spectrum with a frequency of 19 MHz are presented. This confirms the possibility of selective control in the specified frequency range and the output of the research results to a computer for processing according to a universal algorithm and presentation in a formalized structure.