Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2005-11-15
2005-11-15
Matar, Ahmad F. (Department: 2642)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S003020, C455S575100, C455S575700, C455S703000, C455S703000
Reexamination Certificate
active
06965784
ABSTRACT:
A compact lightweight antenna for receiving microwave direct line of sight wireless data signals used in services such as Local Multipoint Distribution Services (LMDS). The antenna provides for precise control over isolation of polarized signals. The antenna consists of an external parabolically shaped dome formed of a suitably resilient material such as thermoplastic. A polarizing conductive grating is formed on the interior surface of the dome and serves as a transreflector for initially passing received radiation having a vertical polarization. A twist reflector disposed at a point along an axis defined by the conductive grating reflects the received radiation, back in the direction of the transreflector with a different polarization. The now differently polarized energy is reflected by the parabolically shaped conductive grating at a feed point located in the center of the twist plate. The transreflecting element may be manufactured by providing a substrate that has been printed and etched and/or a film nonconductive substrate which has been silk screened with a conductive ink. In each of these cases in a preferred embodiment, the substrate or carrier film becomes an integral part of the mold in the resulting article.
REFERENCES:
patent: 4220957 (1980-09-01), Britt
patent: 5455589 (1995-10-01), Huguenin et al.
patent: 5680139 (1997-10-01), Huguenin et al.
patent: 6006419 (1999-12-01), Vandendolder et al.
Kanamaluru Sridhar
Wood Kenneth R.
Hamilton Brook Smith & Reynolds PC
Matar Ahmad F.
Nguyen Quynh H.
YDI Wireless, Inc.
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