| 摘要 |
PROBLEM TO BE SOLVED: To provide a monopole antenna that has a wide resonance frequency band and can reduce height dimensions. SOLUTION: On the surface of a dielectric substrate 2 that is raised on a ground surface 1, first and second radiation conductors 3 and 4 where lengthwise dimensions are slightly different are provided along upper and lower directions. Then, a signal at the same frequency is supplied to each feeder point of the pair of radiation conductors 3 and 4, thus resonating to a radio wave having a wavelength corresponding to the length of each of the radiation conductors 3 and 4 and hence greatly expanding a resonance frequency band. Additionally, the pair of radiation conductors 3 and 4 is provided on the surface of the dielectric substrate 2, thus shortly setting the length in each of the radiation conductors 3 and 4 by adding the decrease in a wavelength due to a dielectric. |
