Aperture coupled circular polarization antenna

Communications: radio wave antennas – Antennas – Microstrip

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343829, H01Q 138

Patent

active

048434000

ABSTRACT:
A generally planar antenna for generating circularly polarized electromagnetic signals, particularly useful at microwave frequencies. Each antenna element comprises a single excitation aperture (7) cut in a planar conductive ground plane (9). Spaced apart from the ground plane (9) by means of a dielectric layer (11) and covering the excitation aperture (7) is a planar conductive radiating patch (5) having slightly different dimensions along each of two orthogonal axes. The radiating patch (5) may have the shape of a near square or an ellipse. Exciting the aperture (7) with linearly polarized electromagnetic energy causes the radiating patch (5) to generate a circularly polarized electromagnetic signal consisting of two orthogonal components that have substantially the same amplitude and are 90.degree. offset in phase from each other. Several antenna elements can be combined to form a large aperture array. Energy may be applied to the excitation aperture (7) by means of a waveguide (3) feed, microstrip line (15), or stripline (15).

REFERENCES:
patent: 3665480 (1972-05-01), Fassett
patent: 4125838 (1978-11-01), Kaloi
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patent: 4130822 (1978-12-01), Conroy
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patent: 4364050 (1982-12-01), Lopez
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patent: 4486758 (1984-12-01), de Ronde
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patent: 4613868 (1986-09-01), Weiss
patent: 4651159 (1987-03-01), Ness
patent: 4755821 (1988-07-01), Itoh et al.
James et al., Microstrip Antenna Theory and Design (1981), p. 202.

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