A grilling apparatus is provided with a grill of an improved structure, thus preventing food from being burnt due to overheating of the grill and reducing a cooking period to cook the food. The conductors may each include two ends heads for engaging with each other or for separating the conductors from each other. The high voltage generation unit may include a high voltage transformer for providing an output power that is multiplied to a desired output level and delivered to an input terminal of an ion beam accelerator. Then, the present position of the mobile station is determined by performing positioning operation using the derived propagation ranges of the direct waves. The invention also can deliver antimicrobial substances to the site of insertion of a catheter and related devices into a body as well as other medicinal factors, such as wound and tissue healing factors that may be desired to be delivered to the site of insertion.