| 摘要 |
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. |
