| 摘要 |
PROBLEM TO BE SOLVED: To provide a two-frequency common antenna having superior characteristics, such as no grating lobes or low interference with each other, even if a plurality of antenna elements are arranged in an array. SOLUTION: In the two-frequency common antenna system, each antenna element resonated at a high-frequency band and a low-frequency band is arranged on a flat board. The antenna elements include one low-frequency antenna resonated in a low-frequency band and two high-frequency antennas resonated in a frequency band which is higher than that of the low-frequency antenna element. The low-frequency antenna and two high-frequency antennas are arranged in a triangular form.
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