S.A. Vinokurov1, A.R. Safin2, D.A. Frolov3

2,3 V. A. Kotelnikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences (Moscow, Russia)

1-3 National Research University “MPEI” (Moscow, Russia)

1 sergey.vinokurow@yandex.ru; 2 arsafin@gmail.com; 3 frolovdan12@gmail.com

Problem statement. Currently, delay line oscillators (DLOs) exhibit several enhanced characteristics compared to lumped-element oscillators, including low phase noise power spectral density (PSD), a relatively wide frequency tuning range, and high sensitivity to external influences. The primary components used to implement DLOs include fiber-optic lines, acoustic dispersive delay lines, and yttrium iron garnet (YIG) spheres and films. The parameters of YIG films are highly dependent on the film fabrication process, including its homogeneity, thickness, and length. The impact of the fabrication process significantly limits the application of YIG films in oscillator design and manufacturing. Consequently, several experiments have been conducted to modify YIG films. One of the more effective modifications involves the addition of metallic or semiconducting strips to the YIG film, creating what is known as a one-dimensional magnonic crystal, or simply a magnonic crystal. In a magnonic crystal, upon signal propagation, a periodic exchange of energy occurs between the incident and reflected waves. This can lead to improved YIG film parameters, such as effective delay time and reduced power consumption. However, the precise impact of the magnonic crystal on the oscillator and the generated signal when used as a delay line is not fully understood.

Objective. The objective of this study is to investigate the properties of a DLO based on a magnonic crystal, with specific attention to the PSD of its amplitude and phase noise.

Results. Due to its periodicity, the magnonic crystal can significantly influence the amplitude, phase, and frequency of the oscillator signal. As the coupling parameter between the incident and reflected waves increases, the PSD values of both amplitude and phase noise increase. Concurrently, the band gap widens, which can either attenuate or completely suppress the signal at specific frequencies. This makes the magnonic crystal suitable for use in information processing and transmission devices, not only as a delay line but also as a notch filter.

Practical significance. This article presents investigations into the influence of the delay time and coupling parameter of a magnonic crystal on the PSD of amplitude and phase noise. The data obtained can assist in the design of DLOs incorporating magnonic crystals.

Vinokurov S.A., Safin A.R., Frolov D.A. The effect of a magnon crystal on the noise of an auto-oscillator with delayed feedback.
Radiotekhnika. 2026. V. 90. № 5. P. 120−130. DOI: https://doi.org/10.18127/j00338486-202605-15 (In Russian)

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