| 摘要 |
<p>A first antenna (2), a circularly polarized wave loop antenna for GPS, is formed on a dielectric board (10) to make a small-sized composite antenna operated in different frequency bands. A second antenna (3), a square patch antenna for ETC, is formed almost concentrically with the first antenna (2). The rear of the dielectric board (10) is earth-patterned and provided with a recess holding an earth pattern to face the second antenna (3). The first antenna (2) is operated as a right rotary circularly polarized wave antenna by electromagnetically coupling an arcuate power supply pattern (4). The second antenna (3) is operated as a right rotary circularly polarized wave antenna by power supply from an axial cable.</p> |
