Dongshan Precision and Shunluo Electronics are two well-known companies that produce 5G filters in the market. Dongshan Precision is a company headquartered in China, focusing on the research and development and production of wireless communication and RF microwave products, providing a variety of RF products including 5G filters. Shunluo Electronics is a company headquartered in Taiwan Province Province, China, and a manufacturer specializing in RF products, providing various 5G filters and other RF solutions.