Disclosed is a process of treating semiconductor substrates, including the production of pure water, a method of producing the pure water for semiconductor fabrication, and a water-producing apparatus. The antenna comprises a first antenna element having a first operating frequency band and a floating antenna element positioned adjacent the first antenna element to electromagnetically couple to the first antenna element. If articular surfaces are provided on both ends of the implant, the articular surfaces have differently curved surfaces. The cover member is inserted into and partially shields the opening, the first end portion and a side of the cover member at the first end portion cooperatively define a fixing hole for allowing a hinge module to extend therethrough. Preferably, the tail current control signal maintains the DLL signal output at a substantially constant amplitude in spite of frequency variations and may also be used to set the voltage swing for the DLL. The Session Border Controllers terminate the tunnel and extracts the QSIG signaling for interworking to SIP, thereby facilitating a homogeneous SIP-based core network.