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This article introduces a new approach to provide a magnetically tunable add-drop filter structure based on a solid–solid phononic crystal by varying the magnetic field intensities of Terfenol-D in the GHz frequency range. The filter system is prepared with a two-dimensional phononic crystal composed of Nylon as the base material, connected with a square array of circular Molybdenum cylinders. The plan includes a bus waveguide connected to a single-ring resonator and a drop waveguide. The ring resonator embraces six embedded Terfenol-D cylinders that control their Young's modulus values, and strategically they are placed on both sides of the ring resonator. This tunable add-drop filter is designed to be manipulated by an outside magnetic field, capitalizing on the changes in Young's modulus in magnetostrictive materials in response to different magnetic field intensities. The tunability of the proposed elastic