1：Experimental Design and Method Selection:

The study involves preparing composite samples and measuring their electromagnetic shielding effectiveness using a waveguide-based setup. The methodology includes sample preparation via hydraulic pressing and attenuation measurement using a generator, waveguide, antennas, detector, and multimeter.

2：Sample Selection and Data Sources:

Composite samples were made with polyvinyl chloride (PVC) as the binder and various fillers including pure iron powder, waste zinc ore, mill scale, and iron dust. Samples are in tile form with dimensions 80 mm x 80 mm and thicknesses from 3.25 mm to 4.6 mm.

3：25 mm to 6 mm. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment includes an HP 70340A generator (1-20 GHz), waveguide for X band, horn antennas, Radiall radio detector (1-18 GHz), digital multimeter, and hydraulic press. Materials include powdered PVC, iron powder, waste zinc ore, mill scale, and iron dust.

4：Experimental Procedures and Operational Workflow:

Samples were manufactured by heating the mold to 130°C for 30 minutes and applying 30 tons of pressure. Measurements were conducted by placing samples between antennas, measuring voltage with and without the sample at frequencies of 8.1, 9, 10, 11, and 11.8 GHz, with multiple displacements for each sample.

5：1, 9, 10, 11, and 8 GHz, with multiple displacements for each sample. Data Analysis Methods:

5. Data Analysis Methods: Attenuation coefficient was calculated from voltage measurements using the detector's voltage-to-power characteristics, with analysis of mean, min, and max values for each sample and frequency.