Compact antenna for low and medium earth orbit satellite communi

Details Compact antenna for low and medium earth orbit satellite communi Compact antenna for low and medium earth orbit satellite communi

1998-09-30

2000-04-11

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

343895, 343700MS, H04B 7185, G01S 502

Patent

active

060493054

ABSTRACT:
A compact, low cost antenna communicates with low and medium earth orbit satellites. The antenna includes a plurality of micro-strip elements arranged about an axis and positioned to illuminate upper elevation angles. The micro-strip elements are perpendicular to each other and are oriented toward the horizon at 90 degree increments. Furthermore, the micro-strip elements are tilted at a 50 degree angle. A quadrifilar helix is positioned at the center of the micro-strip elements and positioned to illuminate lower elevation angles. The micro-strip elements generate an omni-directional field pattern in the azimuth plane. The quadrifilar helix generates a high-gain, narrow beam-width field pattern that is also omni-directional in the azimuth plane. The antenna provides improved immunity to specular ground reflections by limiting reception of signals below a threshold elevation angle. Also, the antenna provides continuous, uninterrupted communications by eliminating "dead" period associated with conventional parabolic dish antennas.

REFERENCES:
patent: 5434581 (1995-07-01), Raguenet et al.
patent: 5831577 (1998-11-01), Nichols et al.
patent: 5838282 (1998-11-01), Lalezari et al.
patent: 5838285 (1998-11-01), Tay et al.
patent: 5874927 (1999-02-01), Knowles et al.

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