Communications: radio wave antennas – Antennas – With support for antenna – reflector or director
Patent
1993-08-24
1995-08-29
Hajec, Donald T.
Communications: radio wave antennas
Antennas
With support for antenna, reflector or director
343790, 343792, H01Q 112
Patent
active
054464730
ABSTRACT:
An antenna of special form--to wit: a tube and more precisely a tubular dipole--is positioned inside an electrically non-conducting tubular post, typically made of fiberglass, that serves to support an electronic device, typically an irrigation controller, that communicates both by wire and by radio. Wired connection is via wires that are channeled and contained, preferably axially centrally tightly, within the tubular support post. The wires are substantially at radio frequency ground, and serve to connect the irrigation controller to one or more remote electrical devices such as soil moisture sensors and electric valves. The tubular dipole antenna is preferably formed as a fiberglass tube having a conducting exterior surface, normally made of metal and preferably copper, that is divided equally into two tubular segments. The two-segment tubular dipole antenna is located within the tubular post so that an axis of the post and an axis of the tubular surface are substantially parallel, and so that the radio-frequency ground connection wires are within both the post and the tubular dipole antenna. A shielded radio frequency feed line, preferably a coaxial cable, connects the irrigation controller in its position supported by the tubular post to the two tubular segments of the electrically-conducting tubular surface at a position between the segments. The electrically-conducting tubular surface thus serves as a tubular antenna. The directional sensitivity of the tubular antenna is substantially unaffected by the wires that are at radio frequency ground because these wires are within its interior.
REFERENCES:
patent: 2234234 (1941-03-01), Cork et al.
patent: 3680131 (1972-07-01), Hall et al.
patent: 3750181 (1973-07-01), Kuecken
patent: 3899787 (1975-08-01), Czerwinski
patent: 5105199 (1992-04-01), Ukmar
patent: 5227730 (1993-07-01), King et al.
patent: 5285211 (1994-02-01), Herper et al.
Fuess William C.
Hajec Donald T.
Phan Tho Gia
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