Production and Shielding Effectiveness Features of Chopped Strands Backed-GdMnO3 Composites for 6.5–17.5 GHz Applications

This research investigates the synthesis and characterization of GdMnO₃/chopped strands composites using the conventional oxide mixing technique. A single-phase GdMnO₃ compound was successfully formed through sintering at 1350 °C for 20 h. Structural analysis using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS) confirmed phase purity and uniform grain morphology. The microwave shielding effectiveness of GdMnO₃/chopped strands composites was evaluated within the 6.5-17.5 GHz frequency range using a network analyzer (NA). The GdMnO₃/chopped strands composite with a 60-40% weight ratio exhibited superior shielding performance, achieving a minimum shielding effectiveness of -35.61 dB at 6.9 GHz, while the 80-20% composite reached -32.54 dB at 16.74 GHz. Both compositions demonstrated shielding effect values below -10 dB across wide frequency bands, with significant attenuation below -20 dB at various GHz ranges. The study demonstrates that by adjusting the content of the components in the samples, the microwave shielding effect performance of the GdMnO₃/chopped strands composites can be easily controlled to meet the requirements of specific frequency bands. These findings highlight the potential of GdMnO₃-based composites for tailored microwave shielding applications, particularly in the military, aerospace, and telecommunication industries.