| 摘要 |
A circular polarization folded microstrip antenna of a three dimensional structure is provided to perform miniaturization without deterioration of radiation efficiency and a gain due to dielectric loss by adjusting a length of a bottom side. A circular polarization folded microstrip antenna of a three dimensional structure includes a metallic triangle patch(110), a ground plate(120), and a dielectric. The triangle patch includes a flat panel part(111), a first iris(112a), a second iris(112b), a third iris(112c), and a fourth iris(112d), and a first folded portion(113a), a second folded portion(113b), a third folded portion(113c), and a fourth folded portion(113d). When the first to fourth folded portions are converged in a central direction of the flat panel part, both oblique sides of each folded portion are separated from one oblique side of a folded portion adjacent thereto by a predetermined gap.
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