Zhurnal Radioelektroniki - Journal of Radio Electronics. eISSN 1684-1719. 2020. No. 7
ContentsFull text in Russian (pdf)
DOI https://doi.org/10.30898/1684-1719.2020.7.3
UDC 537.874; 537.624
DETECTION OF FREQUENCY-MODULATED MICROWAVE SIGNAL WITH THE AID OF MAGNETOSTRICTION TRANSDUCER
V. S. Vlasov1, D. A. Pleshev1, V. G. Shavrov2, V. I. Shcheglov2
1 Syktyvkar State University, Oktyabrskiy prosp. 55, Syktyvkar 167001, Russia
2 Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Mokhovaya 11-7, Moscow 125009, Russia
The paper was received on June 16, 2020
Abstract. The task about detection of frequency-modulated microwave signal with the aid of magnetostriction transducer is investigated. The equations of motion for magnetization and elastic displacement are obtained. They describe the effect of a frequency-modulated alternating magnetic field on the magnetic plate. It is noted that the detection effect consists in selecting the component from the full signal at the modulation frequency, which is carried out due to the excitation of resonance oscillations of the elastic system. On the basis of established parameters of the task the common picture of detection of frequency-modulated signal with the aid of magnetostriction transducer is found. Two stages of detection are established. The first is the excitation of magnetization precession in magnetic plate. The second is the excitation of elastic oscillations in the same plate by the influence of magnetic oscillation to elastic oscillations through the magnetoelastic interaction. Two main cases are distinguished: a small and a large modulation depth, where a small one is insufficient for detection and a large one exceeds the value necessary for a clear detection. It is shown that, at a large modulation depth, strong oscillations of the elastic system arise at the modulation frequency, which is what the detection effect consists of. The influence of the modulation depth on the detection process is investigated. The dependencies of maximum and minimum of magnetic and elastic oscillations from the modulation depth coefficient are investigated. The powerfully oscillating character of both dependencies is found. It is shown that the dependence of oscillation amplitude for magnetic oscillations has smooth decrease character. On the same dependency for magnetic oscillations after short decreasing he large increasing is found after short decreasing, this increasing correspond to detection regime. To interpret the observed phenomena, we consider the expansion of the frequency-modulated signal into Bessel functions. The influence of the modulation frequency on the detection effect is investigated. It is shown that the increase in the dependence of the elastic oscillations amplitude on the value of the modulation parameter with an increase of the modulation frequency shifts toward lower values of this parameter. To interpret such a dependence, a model is proposed according to which a rise in the dependence of the amplitude of elastic oscillations on the value of the modulation parameter corresponds to the appearance of the spectrum components whose combination frequencies are equal to the difference between the carrier frequency and the modulation frequency multiplied to the numerical coefficient. This coefficient is equal to the ratio of the difference between the carrier and modulation frequencies to the modulation frequency. It is shown that the mentioned dependence of the amplitude of elastic oscillations on the value of the modulation parameter is described by the Bessel function, the order of which is equal to the same ratio. A good (within 10%) agreement of the proposed model to the nature of the observed phenomena was revealed.
Key words: detection, frequency modulation, magnetostriction transducer.
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For citation:
Vlasov V.S., Pleshev D.A., Shavrov V.G., Shcheglov V.I. Detection of frequency-modulated microwave signal with the aid of magnetostriction transducer. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2020. No. 7. https://doi.org/10.30898/1684-1719.2020.7.3 (In Russian)