Abstract
The article describes the features of the amplitude and frequency modulation of the output signals of millimeter range generators for microwave therapy. A review of the appearance of possible biological and medical effects using modulated signals is carried out. The use of highly sensitive radar-type equipment made it possible to study the absorption capacity of a person in the mm-wave range from an external source.
 The authors’s results of experimental studies are described, this are showed that at some frequencies, an increased absorption of the power of the irradiating signal is recorded. These frequencies are referred to as “absorption resonances”. The original schemes of monochromatic and noise signal generators developed by the authors are presented, and the principle of their operation is described. The article shows the possibility of generating low-intensity signals and ensuring the generator range operation using the second harmonic of the monochromatic signal and the selective properties of the EHF nodes. The technical parameters and characteristics of the developed devices are revealed. The application areas of the developed devices in practical medicine are out-lined. With the help of the control unit, a low-frequency signal as a saw-like or triangular voltage is generated and is supplied to the varactor converter. Under the influence of the modulation signal, the varactor capacitance changes, and, therefore, the frequency of the EHF generator. The operation of a combined radiation measurement system with a modulated noise-like output spectrum and the patient feedback is described. 
 The article demonstrates the broad practical possibilities for using microprocessor technology for automation and control of the operation mode selection process, for the formation and change of the microwave signal modulation parameters. The conducted studies reveal the process of interaction of low-intensity microwave radiation with the human body and can be used in technologies of millimeter therapy. The article describes the service functions of the developed equipment, which contribute to its more effective use in microwave therapy technologies.
Highlights
Two types of modulation are typically used in medical devices for microwave therapy – amplitude and frequency modulation
The conducted studies reveal the process of interaction of low-intensity microwave radiation with the human body and can be used in technologies of millimeter therapy
No less interesting are the effects of the electromagnetic EHF fields influence, including ones modulated by a low frequency, which were found during the experimental radiation of the human and animal acupuncture points with the aforementioned signals [1]: – organism reflex response to a local microwave influence is aimed at normalization of natural or artificially-created organism disorders, which is typical for the organism response to the influence of different factors on the acupuncture points; – at the low and middle intensity of the microwaves a reflex response is observed while influencing with a modulated EHF signal; – a biologically active frequency band of a pulse microwave modulation varies between 0,1
Summary
1)Yanenko O., 1)Peregudov S., 1)Shevchenko K., 2)Kychak V. 1)National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, Ukraine 2) Vinnytsia National Technical University, Vinnytsia, Ukraine. The article describes the features of the amplitude and frequency modulation of the output signals of millimeter range generators for microwave therapy. The authors’s results of experimental studies are described, this are showed that at some frequencies, an increased absorption of the power of the irradiating signal is recorded. The article shows the possibility of generating low-intensity signals and ensuring the generator range operation using the second harmonic of the monochromatic signal and the selective properties of the EHF nodes. The article demonstrates the broad practical possibilities for using microprocessor technology for automation and control of the operation mode selection process, for the formation and change of the microwave signal modulation parameters. The article describes the service functions of the developed equipment, which contribute to its more effective use in microwave therapy technologies
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