| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna device which has a wide-band/high-gain performance and is excellent in antenna producibility. SOLUTION: Two spiral lines 1 are provided on a dielectric board 2, a feeding device is provided at the center of the spiral lines 1, and the tips of the spiral lines 1 are set open. A grounding conductor 3 is provided on the backside of the dielectric board 2 opposite to its front side where the spiral lines 1 are formed, larger than an area of the dielectric board 2 where the spiral lines 1 are formed, and provided with a cavity which is as deep asλ<SB>H</SB>/4. Small conductor pieces 6 are provided respectively near the tips of the spiral lines 1 at points further than the tips from the center of the antenna, the conductor thin film formed on the backside of the dielectric board are short-circuited to the conductor pieces 6 through through-holes, the conductor thin film is short-circuited to the grounding conductor 3, first resistors 9 are provided between the adjacent spiral lines 1, second resistors 10 are provided between the tips of the spiral lines 1 and the small conductor pieces 6 respectively, and a resistor pair composed of two resistors of 9 and 10 is provided at the two tips of the spiral lines 1, respectively. COPYRIGHT: (C)2007,JPO&INPIT
|
