| 摘要 |
The present invention relates to a compact, lightweight microstrip antenna that operates at two frequencies that are widely different. On a dielectric substrate are formed an element consisting of an annular conductive pattern, wherein a central edge side thereof is short-circuited to a ground electrode, and an element consisting of a circular conductive pattern within the annular conductive pattern. The circular conductive pattern is accommodated within the annular conductive pattern. The two antennas operate at different frequencies, with the element formed by the annular conductive pattern resonating in TM11 mode and the element formed of the circular pattern resonating in the TM01 mode. An antenna capable of being used in common by systems with widely different frequency bands, such as the GPS and VICS, is thus obtained.
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