| 摘要 |
The present invention relates to a block for shielding electromagnetic waves. A conical cavity is formed in a concrete block. The large caliber of the conical cavity is positioned to face the outside in order for electromagnetic waves to be induced toward the large caliber and guided to the small caliber. Accordingly, the electromagnetic waves flowing in the conical cavity of the block are shielded and absorbed. The conical cavity is not exposed to the outside when the conical cavity is seen from the outside as a plurality of conical cavities is formed in the block. Therefore, an additional space is not required around the wall of the block, and the appearance of a brick is not affected. The conical cavity is not damaged in long-term use. |
