Circular polarized wave reception antenna

Details Circular polarized wave reception antenna Circular polarized wave reception antenna

2005-06-14

2005-06-14

Nguyen, Hoang V. (Department: 2821)

Communications: radio wave antennas

Antennas

Spiral or helical type

C343S756000

Reexamination Certificate

active

06906683

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.

REFERENCES:
patent: 6181286 (2001-01-01), Roscoe et al.
patent: 2002/0118140 (2002-08-01), Ogawa et al.
patent: 2001-326523 (2001-11-01), None
patent: 2001-339227 (2001-12-01), None
patent: 2003-37430 (2003-02-01), None

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