| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna device capable of easily and speedily controlling a resonance frequency, without having to change a radiation conductor pattern concerning an antenna composed of the radiation conductor pattern formed on a dielectric substrate. SOLUTION: This antenna device has a dielectric substrate 1, formed with a power feeder 4 connected via a matching circuit 5 to a power feed part and the pattern of a radiation conductor 2, a land 3 for mounting chip components for interconnecting arbitrary two points on the pattern of the radiation conductor 2 and a jumper resistor 6, which can be automatically mounted on the land 3, and a monopole antenna is formed as a whole. Since the electrical length of the radiation conductor 2 is made different, corresponding to the mounting position of the jumper resistor 6, different plural resonance frequencies can be provided. Furthermore, it is not necessary to change the pattern form of the radiation conductor 2 and the jumper resistor 6 can be mounted or mounting position can be changed easily by manual work before mass-production or automatic mounting, similarly to the other circuit component at mass production, when controlling the resonance frequency.
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