The term 'passive components' originates from the Taiwanese electronics industry; in mainland China, they are often referred to as 'passive devices.' Passive devices are a crucial category in microwave and radio frequency devices and hold a very important position in microwave technology. Passive devices mainly include resistors, capacitors, inductors, converters, attenuators, matching networks, resonators, filters, mixers, and switches. Because the materials used in these products are often acid-sensitive, a near-neutral chemical treatment agent is required during the electroplating process, i.e., specialized electronic chemicals for passive components.