DIELECTRIC ANTENNA

摘要

The present invention relates mainly to a small dielectric antenna capable of obtaining a good VSWR characteristic even if it is placed in the vicinity of a grounding pattern when mounted on a circuit board. A dielectric antenna is formed in which a feed point of an antenna element 13 having a resonance frequency set to a first frequency in a first frequency band and a feed point of an antenna element 14 having a resonance frequency set to a second frequency are connected to an external feed terminal 12b, and an open stub 15 connected to the antenna element 14 in the vicinity of the feed point. The open stub 15 is provided to enable resonance at each of frequencies to be used while the lengths of the antenna elements 13 and 14 are shorter than ordinary lengths determined according to the wavelengths of the frequency to be used. Further, even in the case of placement in the vicinity of a grounding conductor pattern 3 at the time of mounting on a circuit board 1, the frequency bandwidth through which a good VSWR characteristic can be obtained in a used frequency band can be extended.