Omni-directional optical antenna element

Details Omni-directional optical antenna element Omni-directional optical antenna element

1990-02-26

1991-07-23

Arnold, Bruce Y.

350441, 350442, 350445, G02B 1306, G02B 1700

Patent

active

050338331

ABSTRACT:
An omni-directional antenna for use with light or other electromagnetic radiation has a surface extending outward from a central axis. The surface can be either radially symmetrical or asymmetrical. A portion of the surface adjacent to the axis is substantially transmissive and the remainder of the surface is substantially reflective. The reflective portion of the surface curves radially outward from the transmissive portion. The shapes and sizes of the transmissive and reflective portions of the surface are fixed such that upwardly directed rays striking the surface of the device parallel to the axis will be refracted by the transmissive portion and/or reflected by the reflective portion of the surface into a substantially omni-directional output pattern, when the device is used as a transmitter. Conversely, when used as a receiving antenna, rays striking the transmissive portion of the surface will be refracted and rays striking the reflective portion will be reflected into a downwardly directed output pattern substantially parallel to the axis.

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Hect, Eugene and Zajac, Alfred, Optics, Addison-Wesley 1989, p. 120.

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