| 摘要 |
<P>PROBLEM TO BE SOLVED: To inexpensively provide a composite antenna suitable for reducing size and mutual isolation of antenna elements of which is satisfactory. <P>SOLUTION: In the composite antenna 1, a radiation conductor 3 resonating at a first frequency band is located on one side of a dielectric base 2, and a radiation conductor 4 surrounding the radiation conductor 3 over the entire circumference and resonated at a second frequency band lower than the first frequency band in frequencies, and a ground conductor 8 corresponding to the radiation conductor 3 and a ground conductor 9 corresponding to the radiation conductor 4, are placed on the other side of the dielectric base 2. The radiation conductors 3, 4 act as radiation elements of a circularly polarized wave antenna, excited at one-point feeding by connecting a feed pin 5 to the feed point of the inner radiation conductor 3 and connecting a feed pin 6 to the feed point of the outer radiation conductor 4. Further, the feed point impedance of the radiation conductor 4 is adjusted, by making a plurality of parts of an inner circumferential edge of the outer radiation conductor 4 short-circuited with the ground conductor 9 via a short-circuit pin 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
