Wave transmission lines and networks – Long lines – Leaky lines
Reexamination Certificate
2001-03-27
2002-12-31
Tokar, Michael (Department: 2819)
Wave transmission lines and networks
Long lines
Leaky lines
C343S770000, C333S239000, C333S241000
Reexamination Certificate
active
06501350
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to the field of radiating cables and more specifically to a flat, flexible radiating cable used as a transmitting and/or receiving antenna.
BACKGROUND OF THE INVENTION
Radiating or “leaky” cables are well known in the art of radio transceivers. Flat radiating cables are also known. They are an alternative to coaxial radiating cables and especially well suited for certain applications where a low profile is desirable. Further, they are generally inexpensive to manufacture do to their simple construction.
Examples of flat radiating cables are disclosed in U.S. Pat. No. 2,800,634 to Grieg et al. and U.S. Pat. No. 6,081,728 to Stein et al. These prior art flat radiating cables all suffer from a common weakness. Such cables generally include a flexible dielectric core laminated between and adhered to two conductive layers, such as the flat cable
50
shown in FIG.
1
.
A typical material which is used for the conductive layers is a metallic foil, such as copper. However, as illustrated in
FIG. 2
, when the cable
50
is flexed, kinks
52
may develop in the foil. This kinking effect is due, at least in part, to the differences in longitudinal compressibility between the various materials employed in the cable
50
. Such kinks
52
have the adverse effect of significantly limiting the frequency response of the cable
50
at higher frequencies.
There is an increasing use of higher frequency transmission, such as in wireless data transmission. Thus, it would be desirable to provide a flat radiating cable for high frequency radio transmission and/or reception that is not prone to the frequency limiting kinks described above.
BRIEF SUMMARY OF THE INVENTION
According to the present invention, a radiating cable is provided. The cable comprises a first layer comprising conductive material, a second layer comprising conductive material, and a dielectric layer being positioned between and adjacent to both the first layer and the second layer. At least one of the first layer and the second layer comprises a resilient material. Further, at least one of the first layer, the second layer, and the dielectric layer is movable relative to the other layers.
REFERENCES:
patent: 2800634 (1957-07-01), Greig et al.
patent: 3587098 (1971-06-01), Gosnell
patent: 3890615 (1975-06-01), Moran
patent: 4063246 (1977-12-01), Greiser
patent: 4701765 (1987-10-01), Arduini et al.
patent: 4804965 (1989-02-01), Roederer
patent: 4963891 (1990-10-01), Aoyagi et al.
patent: 5068632 (1991-11-01), Champeau
patent: 5155493 (1992-10-01), Thursby et al.
patent: 5355143 (1994-10-01), Zürcher et al.
patent: 5744756 (1998-04-01), Springer et al.
patent: 5767806 (1998-06-01), Watanabe et al.
patent: 5847324 (1998-12-01), Farquhar et al.
patent: 6081728 (2000-06-01), Stein et al.
patent: 6087996 (2000-06-01), Dery
Electrolock, Inc.
Pearne & Gordon LLP
Tokar Michael
Tran Anh Q.
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