| 摘要 |
<p>A combination antenna device wherein a helical antenna which is constituted of a helical element and supplies power to a coaxial line and a monopole antenna which is constituted of an outer conductor of the coaxial line are formed coaxially and therefore a gain in a horizontal plane can be made uniform and an occupation volume can be made small. At an upper end section of a coaxial line (11), a balun (16) connected to an inner conductor (12) of the coaxial line (11) is installed. One end of a helical element (17) constituted of a pair of wire conductors is connected to the balun (16), and the other end is swiveled around the coaxial line symmetrically about the center of the line in the direction opposite to the balun and is connected to an outer conductor (13) at a lower end section of the coaxial line. At the lower end section of the coaxial line, an inner conductor connection terminal (14) connected to the inner conductor of the coaxial line and an outer conductor connection terminal (15) connected to the outer conductor are installed.</p> |
