Communications: radio wave antennas – Antennas – Slot type
Patent
1995-05-23
1997-04-15
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Slot type
343719, H01Q 1310
Patent
active
056214197
ABSTRACT:
A radio antenna for mounting in the lid of a water meter box and forming part of a remote meter reading system comprises an annular conductive plate and a circular conductive plate which are coaxial with and parallel to each other and spaced apart to define a slot, the circular plate serving as a ground plate. The antenna has an input in the form of a conductive pillar interconnecting the two members, with a drive input at a selected point along the length of the pillar and a second input on the ground plate. A variable tuning capacitance is disposed between the plates diametrically opposite the conductive pillar. The ground plate also serves for locating the lid in undergrowth or under snow using a metal detector.
REFERENCES:
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patent: 2791769 (1957-05-01), Lindenblad
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patent: 4994817 (1991-02-01), Munsum et al.
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Dilworth Ian J.
Meek Thomas R.
Hajec Donald T.
Phan Tho
Pojunas Leonard W.
Schlumberger Industries Limited
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