Antenna and radio device comprising the same

摘要

An antenna capable of transmitting/receiving waves in multi-ranged frequency bands providing high antenna gain, reliability and productivity, and a radio communication apparatus using the same. The feed portion is electrically connected with the antenna element portion at its one end, and with the radio-frequency circuit of the apparatus at the other end. The dielectric material-made core rod mechanically supports the antenna element portion. The dielectric material-made radome partially covers the antenna element and feed portions. The antenna element portion is formed of an approximately helical-shaped portion and an approximately meander-shaped portion, both of which are made of a thin-belt-shaped conductive plate and concentrically formed on the core rod. Properly adjusting of the helical-shaped and the meander-shaped portions can provide impedance characteristics optimal for multi-ranged frequency bands.