| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain satisfactory isolation characteristic without sacrificing a radiation area in a composite antenna which operates in different frequencies and is suitably miniaturized. <P>SOLUTION: A first radiation conductor 3 resonating in a first frequency band, a circular conductor 4 circularly surrounding the first radiation conductor 3 with a gap, and a second radiation conductor 5 surrounding the circular conductor 4 with a gap and resonating in a second frequency band lower than the first frequency band, are concentrically formed into a pattern on one surface of a dielectric substrate 2 of the composite antenna 1. Also, the first ground conductor 6 of the ground of the first radiation conductor 3, and the second ground conductor 7 ground of the second radiation conductor 5, are concentrically formed into a pattern on the other surface of the dielectric substrate 2. The circular conductor 4 is conducted to the first ground conductor 6 through a via hole 10, and the inner circumferential edge of the second radiation conductor 5 is conducted to the second ground conductor 7 through the via hole. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
