| 摘要 |
First and second radiating conductors are concentrically formed on a top surface of a dielectric substrate, and a grounding conductor is formed on a bottom surface of the dielectric substrate. A feeding pin is connected to a power feeding point of the first radiating conductor. Shorting pins are connected to an inner circumferential portion of the second radiating conductor to be shorted by the grounding conductor. An interval between the radiating conductors allows the first and second radiating conductors to be electromagnetically coupled with each other. When the first radiating conductor is excited at a frequency fH by direct feeding from the feeding pin, the second radiating conductor is fed by the coupling, so that it is excited at a frequency fL lower than the frequency fH.
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