ANTENNA

摘要

PROBLEM TO BE SOLVED: To obtain a small and sensitive antenna at the time of communication by using a folded antenna in a first antenna part where electric lengths are respectively specified against first and second frequencies and connecting the second antenna part where the electric length is specified against the second frequency at the time of communication. SOLUTION: An antenna consists of the first antenna part 10 where a folding part is formed by folding an antenna element consisting of a long size conductor and the second antenna part 20 which is electrically connected to the antenna part 10 when extended from a case to the outside. The antenna part 10 is formed so as to permit the electric length to be 1/3 wave length against a first frequency band as a whole and to be 3/4 wave length. The antenna part 20 consists of the antenna element 21 where the electric length becomes 1/2 wave length against the second frequency band and the antenna element 22 which is electrically connected to the antenna element 21 and formed so as to be 1/2 wave length against the first frequency band as a whole.