| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna which can be operated by a plurality of arbitrary frequencies with comparatively simple structure. SOLUTION: The antenna is provided with a casing constituted of a ground conductor forming the lower face of the antenna, a ceiling conductor which is oppositely arranged to the ground conductor and forms the upper face of the antenna, and side conductors forming antenna sides, with at least one opening part arranged in a part of the casing and opened to radiate a radio wave, with a power feeding point which is arranged on the ground conductor and to which power is supplied from outside through a prescribed power feeding line and with an antenna element which is connected to the power feeding point at one end side, is connected to the ceiling conductor at the other end side through a frequency selecting circuit and whose periphery is surrounded by the side conductors. |
