N. S. Maximov1, A. R. Safin2
1, 2 National Research University “Moscow Power Engineering Institute” (Moscow, Russia)
2 Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences (Moscow, Russia)

1 Nik.maximovv@yandex.ru

One of the key challenges in designing ferromagnetic film-based delay lines is controlling the spectrum of excited spin waves. Ideally, it is desirable to achieve uniform and predictable propagation of a single dominant mode to avoid signal distortion, intermodulation interference, and instability in delay time. In practice, the width of the microstrip line used for excitation and detection of spin waves significantly influences the generation of additional modes. This work presents results of three-dimensional electrodynamical modeling of spin-wave resonators based on thin yttrium iron garnet (YIG) films, excited and detected using printed microstrip antennas. The influence of substrate configuration on resonance characteristics has been investigated. Three configurations have been analyzed: with an isolated metallic ground plane, with a grounded screen via an array of through-vias, and without a metallic ground plane. Simulations have been performed in the frequency domain using the finite element method (FEM). It has been demonstrated that grounding the screen substantially improves the quality factor of the resonance peaks and suppresses parasitic modes. The obtained results are of significant importance for the development of compact microwave devices based on spin waves, including filters, oscillators, and delay lines.

Maximov N.S., Safin A.R. Numerical simulation of the influence of a grounded shielded substrate on the characteristics of spin-wave delay lines based on yttrium iron garnet films // Antennas. 2026. № 3. P. 64–69. DOI: https://doi.org/10.18127/j03209601-202603-06

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