The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 14, 2005
Filed:
Aug. 04, 2003
Masakazu Ikeda, Machida, JP;
Hisamatsu Nakano, Kodaira-shi, Tokyo, JP;
Akira Miyoshi, Hachioji, JP;
Other;
Mitsumi Electric Co., Ltd., Tama, JP;
Abstract
A circular polarized wave reception antenna has a monopole antenna having a pole portion and an ground plate for grounding one terminal of the pole portion and a polarization converting arrangement disposed around the monopole antenna. The polarization converting arrangement has a plurality of helical leads extending in a helical fashion along the pole portion with apart from the pole portion by a predetermined distance. Each of the helical leads has an end grounded in said ground plate. The helical leads are disposed at equal angular spaces around the pole portion. When a resonance wavelength λ is equal to 128.3 mm, the predetermined space is equal to 20 mm. Each helical lead has a length of λ/4. A pitch angle included between the ground plate and each helical lead is equal to 40 degrees.