| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a dual-band antenna which can be easily designed. <P>SOLUTION: The whole length of an antenna in an current direction is set at L0. Where the wavelength of a radio wave in communication is λ, L0=λ/2. When a wavelength of n times λ is transmitted and received, L0 is divided by n and both ends of a base portion 103 is folded so that the length of L0/n of the center of the base portion 103 may not overlap on a folded portion 102. In this case, the folded portions 102 are formed on both the ends of the base portion 103 so that the current direction of the base portion 103 may be opposite to the current direction of the folded portions 102. In case of λ/n wavelength, electromagnetic field distribution of the folded portions 102 and electromagnetic field distribution of the base portion 103 overlapping on the folded portions 102 are canceled in vector, and null disappears. <P>COPYRIGHT: (C)2010,JPO&INPIT |
