| 摘要 |
An antenna system is provided to minimize influence of noise due to internal circuits of an electrical device and to reduce transmission loss of signals by inserting an impedance matching unit into an inside of an antenna. An antenna system includes a multi-stage rod antenna and an impedance matching unit(120). The impedance matching unit is inserted into a lower end of the rod antenna in order to be electrically connected to the rod antenna. The impedance matching unit includes a first conductive part(121), an impedance part(125), and a second conductive part(123). The first conductive part is formed at a lower end part of the rod antenna. The first conductive part is inserted into the rod antenna. The impedance part is formed in the inside of the rod antenna in order to be electrically connected to the first conductive part. The impedance part performs an impedance matching operation of the signal received from the rod antenna. The second conductive part is used for connecting the impedance part with a feeding unit.
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